WO2025238708A1 - Dispositif de commande, système de communication optique et procédé d'ouverture de trajet optique - Google Patents

Dispositif de commande, système de communication optique et procédé d'ouverture de trajet optique

Info

Publication number
WO2025238708A1
WO2025238708A1 PCT/JP2024/017780 JP2024017780W WO2025238708A1 WO 2025238708 A1 WO2025238708 A1 WO 2025238708A1 JP 2024017780 W JP2024017780 W JP 2024017780W WO 2025238708 A1 WO2025238708 A1 WO 2025238708A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
port
optical node
communication device
ports
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/017780
Other languages
English (en)
Japanese (ja)
Inventor
慎 金子
智暁 吉田
淳一 可児
康隆 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
NTT Inc USA
Original Assignee
Nippon Telegraph and Telephone Corp
NTT Inc USA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, NTT Inc USA filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2024/017780 priority Critical patent/WO2025238708A1/fr
Publication of WO2025238708A1 publication Critical patent/WO2025238708A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems

Definitions

  • the present invention relates to a control device, an optical communication system, and an optical path opening method.
  • FIGs 17 and 18 are diagrams explaining how an optical path is opened in a conventional optical communication system S.
  • the conventional optical communication system S comprises multiple communication devices 200-1 to 200-3, multiple communication devices 300-1 to 300-3, multiple control units 400-1 to 400-2, and multiple optical node devices 500-1 to 500-2.
  • communication device 200-1 is not connected to optical node device 500-1
  • communication devices 200-2 to 200-3 are connected to optical node device 500-1 via optical transmission paths
  • communication devices 300-1 to 300-3 are connected to optical node device 500-2 via optical transmission paths.
  • Optical node device 500-1 and optical node device 500-2 are connected via an optical communication NW 600 configured by an optical transmission path.
  • Control unit 400-1 manages communication device 200 and controls the operation of optical node device 500-1.
  • Control unit 400-2 manages communication device 300 and controls the operation of optical node device 500-2.
  • Optical node devices 500-1 to 500-2 are connected to multiple optical transmission paths, and output optical signals input from each port to ports that are set as connection ports for the port in question.
  • the connection relationships between ports can be changed or set as desired.
  • Optical node devices 500-1 to 500-2 can also multiplex optical signals input from multiple communication devices 200, 300 to different ports, and output the multiplexed signal light to an optical transmission path from another port.
  • the new connected device and the control unit 400 exchange information necessary for registering and authenticating the new connected device, and the subscriber device management control unit 420 can instruct the new connected device on the emission wavelength to be used for transmission and reception.
  • the control unit 400 and communication devices 200, 300 may exchange control signals using the same optical transmission path as the main signal light. For example, a configuration can be used in which control signal light is transmitted and received using a wavelength different from the main signal light, or a configuration can be used in which a low-speed control signal called an AMCC (Auxiliary Management and Control Channel) is superimposed.
  • the control signal includes status information indicating, for example, the transmission and reception wavelengths, transmitted light intensity, and temperature of the optical transceiver equipped in the communication device.
  • the optical node control unit 410 changes the port connection settings of the optical node device 500-1 so that the optical signal transmitted from the newly connected device, communication device 200-1, is forwarded to the communication device 300 (e.g., communication device 300-1) that will be the communication partner, as shown in FIG. 18.
  • the control unit 400-2 changes the port connection settings of the optical node device 500-2 so that the optical signal transmitted from communication device 200-1 is forwarded to the communication device 300 (e.g., communication device 300-1) that will be the communication partner. This allows the optical path connecting communication device 200-1 and communication device 300-1 to be opened, as shown in FIG. 18.
  • a single optical transmission path connects each communication device 200 to the optical node device 500-1, and each communication device 300 to the optical node device 500-2. Furthermore, Figures 17 and 18 show a single-core bidirectional transmission configuration in which upstream signal light from each communication device 200, 300 to the optical node device 500 and downstream signal light from the optical node device 500 to each communication device 200, 300 are wavelength-multiplexed within a single optical transmission path.
  • a two-core transmission network configuration may be used in which the communication devices 200, 300 and the optical node device 500 are connected by two optical transmission paths L, and the upstream signal light and the downstream signal light are transmitted over different optical transmission paths L.
  • Figure 19 is a diagram showing an example of a two-core transmission configuration in a conventional optical communication system S.
  • a two-core transmission network configuration is used, for example, when coherent transceivers are used as the optical transceivers for the communication devices 200, 300.
  • Coherent transceivers achieve high receiving sensitivity by interfering high-intensity local light with the input optical signal and extracting the beat component as a signal component.
  • This type of optical transceiver configuration is used because using a portion of the output light from the light source for the outgoing optical signal as local light eliminates the need for a dedicated local light source, making optical transceivers more economical.
  • the beat component between the local light and the upstream signal light returning to the optical transceiver due to reflections in the optical transmission path becomes a large noise component, significantly degrading the reception characteristics of the downstream signal. For this reason, when using coherent transceivers, a two-core transmission network configuration is widely used.
  • the control unit 400 In the case of a network configuration using two-core transmission, the control unit 400 must recognize the port of the optical node device 500-1 that connects to the transmission port of the communication device 200 and set the connection relationship between the ports so that the optical node device 500 can forward optical signals sent from the communication device 200 using two-core transmission to the communication device 300 that is the communication partner. Also, in order for the optical node device 500 to forward optical signals sent from the communication device 300 that is the communication partner to the communication device 200, the control unit 400 must recognize the port of the optical node device 500-1 that connects to the reception port of the communication device 200 and set the connection relationship between the ports.
  • optical access networks in order to efficiently accommodate multiple communication devices scattered within a certain area, multiple optical fibers are bundled and laid from the telecommunications carrier building to this area, and the optical fiber used to accommodate the communication devices in the subscriber's home is pulled in from, for example, a utility pole near the subscriber's home. Therefore, in a two-core transmission network configuration, two optical fibers must be pulled into the subscriber's home. At this time, it is not possible to determine which ports on the optical node device 500 the two optical fibers selected from the bundled multiple optical fibers and connected to the transmission and reception ports of the communication device are connected to. As a result, the control unit 400 is unable to set the connection relationship between the ports of the optical node device 500.
  • the present invention aims to provide technology that can open optical paths regardless of the type of transmission method used by the communication devices.
  • One aspect of the present invention is a control device comprising an optical node control unit that identifies one or two ports of the optical node device to which the one or more newly connected communication devices are connected, based on port identification information for identifying a port that detects an optical signal transmitted from the one or more newly connected communication devices, and port management information in which pairs of ports from the one or more ports of the one or more optical node devices are registered as pairs, and controls the connection between the ports of the optical node device based on the identified ports of the optical node device so that the optical signal transmitted from the one or more newly connected communication devices is forwarded to the communication device with which it is communicating.
  • One aspect of the present invention is an optical communications system comprising: one or more optical node devices that have a plurality of ports to which communication devices performing single-core bidirectional transmission or dual-core transmission are connected, and that transmit port identification information for identifying ports that have detected optical signals transmitted from one or more newly connected communication devices; and an optical node control unit that identifies one or two ports of the optical node device to which the one or more newly connected communication devices are connected based on the port identification information transmitted from the one or more optical node devices and port management information in which pairs of ports from among the multiple ports provided on the one or more optical node devices are registered as pairs, and that controls connections between ports of the optical node devices based on the identified ports of the optical node device so that optical signals transmitted from the one or more newly connected communication devices are forwarded to the communication device with which they communicate.
  • One aspect of the present invention is an optical path opening method that identifies one or two ports of one or more optical node devices to which one or more newly connected communication devices are connected, based on port identification information for identifying a port that detects an optical signal transmitted from one or more newly connected communication devices, the optical node devices having a plurality of ports to which communication devices performing single-core bidirectional transmission or dual-core transmission are connected, and port management information in which pairs of ports from among the plurality of ports of the one or more optical node devices are registered as pairs, and controls the connection between the ports of the optical node devices so that the optical signal transmitted from the one or more newly connected communication devices is forwarded to the communication device with which it is communicating, based on the identified ports of the optical node devices.
  • This invention makes it possible to open optical paths regardless of the type of transmission method used by the communications device.
  • FIG. 1 is a diagram illustrating an example of the configuration of an optical communication system according to a first embodiment.
  • FIG. 2 is a diagram illustrating an example of the configuration of an optical transfer unit according to the first embodiment.
  • FIG. 4 is a diagram illustrating an example of a connection port table according to the first embodiment.
  • FIG. 2 is a sequence diagram showing the flow of an optical path opening process in the optical communication system according to the first embodiment.
  • FIG. 2 is a sequence diagram showing the flow of an optical path opening process in the optical communication system according to the first embodiment.
  • 5A and 5B are diagrams for explaining a registration method of a connection port table in the first embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to a first modified example of the first embodiment.
  • FIG. 10 is a diagram illustrating an example of a connection port table according to a first modified example of the first embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to a first modified example of the first embodiment.
  • FIG. 10 is a diagram for explaining a registration method of a connection port table in a first modified example of the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration example of an optical communication system according to a second modified example of the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration example of an optical communication system according to a third modified example of the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration example of an optical communication system according to a second embodiment.
  • FIG. 10 is a diagram for explaining a registration method of a connection port table in the second embodiment.
  • FIG. 10 is a diagram illustrating another example of the optical communication system according to the second embodiment.
  • FIG. 10 is a diagram for explaining a registration method of a connection port table in the second embodiment.
  • FIG. 1 is a diagram for explaining a method for opening an optical path in a conventional optical communication system.
  • FIG. 1 is a diagram for explaining a method for opening an optical path in a conventional optical communication system.
  • FIG. 1 is a diagram illustrating an example of a configuration for two-core transmission in a conventional optical communication system S.
  • FIG. 1 is a diagram showing an example configuration of an optical communication system 100 according to the first embodiment.
  • the optical communication system 100 includes an optical node device 10 and a control unit 20.
  • One or more communication devices 30 are connected to the optical node device 10 via an optical transmission path L.
  • the optical transmission path L is, for example, an optical fiber.
  • the optical communication system 100 according to the first embodiment will be described taking as an example a case where one or more communication devices 30 perform two-core transmission. Therefore, each communication device 30 is connected to the optical node device 10 via different optical transmission paths L for transmission and reception.
  • the optical communication system 100 includes multiple optical node devices and multiple control units as shown in Figure 17.
  • the optical communication system 100 may include a control unit for each optical node device, or one control unit for multiple optical node devices.
  • the optical node device 10 is connected to other optical node devices or communication devices via optical transmission paths L at ports different from the port to which one communication device 30 is connected.
  • a communication device 30 transmits an optical signal
  • a communication device (not shown) receives the optical signal transmitted from the communication device 30.
  • the direction from the communication device 30 toward the control unit 20 is referred to as the upstream direction, and the direction from the control unit 20 toward the communication device 30 is referred to as the downstream direction.
  • the number of optical node devices 10 and communication devices 30 is no particular limitation.
  • the optical node device 10 is a node device that constitutes a wavelength network and accommodates one or more communication devices 30.
  • the optical node device 10 comprises multiple optical transfer units 11, multiple wavelength distribution units 12, and a WXC unit 13.
  • the optical transfer unit 11 has multiple first ports and multiple second ports.
  • the optical transfer unit 11 sets up connections between ports in response to instructions from the control unit 20, and outputs input optical signals from other ports regardless of wavelength.
  • the optical transfer unit 11 is, for example, an optical switch based on a piezoelectric actuator or MEMS (Micro Electro Mechanical Systems).
  • One or more communication devices 30 are connected to the multiple first ports via optical transmission paths L.
  • the wavelength distribution unit 12 is connected to the multiple second ports.
  • the optical node device 10 is shown configured to include multiple optical transfer units 11-1 and 11-2.
  • the optical transfer unit 11-1 is used to transfer upstream signal light.
  • the optical transfer unit 11-1 transfers the upstream signal light transmitted from the communication device 30 to the wavelength distribution unit 12.
  • the optical transfer unit 11-2 is used to transfer downstream signal light.
  • the optical transfer unit 11-2 transfers the downstream signal light transferred from the wavelength distribution unit 12 to the destination communication device 30.
  • the optical node device 10 includes multiple optical transfer units 11-1 and 11-2, it may also be configured such that a single optical transfer unit 11 transfers both upstream and downstream signal light. In the following explanation, it is assumed that a single optical transfer unit 11 transfers both upstream and downstream signal light.
  • the optical transfer unit 11 has a light detection function for each first port.
  • the light detection function is a function for detecting optical signals input to the first port of the optical transfer unit 11. This allows the optical node device 10 to identify which first port an optical signal transmitted from the communication device 30 was input to.
  • the light detection function of the optical transfer unit 11 can be realized by monitoring the input light intensity to each first port.
  • the light detection function of the optical transfer unit 11 can be realized by a configuration in which each first port of the optical transfer unit 11 has a built-in light intensity monitor, or by attaching an external light intensity monitor to each first port of the optical transfer unit 11.
  • the optical transfer unit 11 transmits port identification information to the control unit 20 that can identify the port at which the light input was detected by the light detection function.
  • the wavelength distribution unit 12 distributes one or more input optical signals. Specifically, the wavelength distribution unit 12 performs add and drop operations.
  • the add operation is an operation in which optical signals having the same output route are multiplexed from optical signals transmitted from multiple communication devices and output to the WXC unit 13 for each route.
  • the drop operation is an operation in which optical signals input from multiple routes and addressed to each communication device are output so that they reach the communication device in question.
  • the WXC unit 13 performs wavelength multiplexing or wavelength demultiplexing of optical signals for each path.
  • the WXC unit 13 has multiple wavelength multiplexing units 131 and multiple wavelength demultiplexing units 132.
  • the WXC unit 13 has a combination of one wavelength multiplexing unit 131 and one wavelength demultiplexing unit 132 for at least each path.
  • Figure 1 shows an example with two paths, so the WXC unit 13 has at least two wavelength multiplexing units 131-1 to 131-2 and two wavelength demultiplexing units 132-1 to 132-2. Note that the WXC unit 13 may have two or more combinations of wavelength multiplexing units 131 and wavelength demultiplexing units 132.
  • the wavelength multiplexing unit 131 multiplexes the optical signals input from each wavelength distribution unit 12 and outputs them to the optical transmission path L.
  • the wavelength separation unit 132 separates the wavelength-multiplexed optical signals input from the optical transmission path L according to wavelength, and outputs the separated optical signals of each wavelength to the wavelength distribution unit 12 that accommodates the communication device that is the destination of each optical signal. Note that the wavelength separation unit 132 outputs, among the wavelength-multiplexed optical signals input from the optical transmission path L, optical signals addressed to communication devices accommodated in optical node devices at other bases to the wavelength multiplexing/demultiplexing unit of the path to that base.
  • the optical node device 10 may include functional units other than the optical transfer unit 11, wavelength distribution unit 12, and WXC unit 13. Furthermore, the optical node device 10 may not include any of the functional units of the optical transfer unit 11, wavelength distribution unit 12, and WXC unit 13.
  • the optical node device 10 may be a ROADM (Reconfigurable Optical Add-Drop Multiplexer) device that does not include the optical transfer unit 11, but includes the wavelength distribution unit 12 and WXC unit 13.
  • ROADM Reconfigurable Optical Add-Drop Multiplexer
  • the optical node device 10 can achieve the above-mentioned optical detection function by monitoring the input light intensity to each first port of the wavelength distribution unit 12.
  • Each first port of the wavelength distribution unit 12 is a port connected to the optical transfer unit 11. Note that if the optical node device 10 does not have an optical transfer unit 11, each first port of the wavelength distribution unit 12 is a port connected to the communication device 30 via the optical transmission path L.
  • control unit 20 controls the optical node device 10 and the communication device 30.
  • control of the optical node device 10 includes, for example, setting up connections between ports of the optical forwarding unit 11, wavelength distribution unit 12, and WXC unit 13 (for example, setting up transfer paths).
  • Control of the communication device 30 includes, for example, processing such as authentication and registration with a new connection device, allocating an emission wavelength to the communication device 30, issuing instructions to stop light and change wavelengths, etc.
  • the control unit 20 includes a subscriber device management control unit 21, an optical node control unit 22, and a table storage unit 23.
  • the subscriber device management control unit 21 performs the above-mentioned control on communication devices 30 connected to the optical node device 10 (including, for example, communication devices 30 already connected to the optical node device 10 and newly connected devices).
  • the optical node control unit 22 performs routing control and the like in the optical node device 10 so that the communication device 30 can communicate with the subscriber device with which it will communicate. Furthermore, the optical node control unit 22 identifies the port to which the newly connected device is connected based on port identification information sent from the optical node device 10.
  • the optical transmission path L used for transmission and the optical transmission path L used for reception are different. Therefore, the first port where optical input is detected in the optical forwarding unit 11 is connected to the transmission port of the communication device 30. Therefore, the optical node control unit 22 can recognize that the port identified based on the port identification information is connected to the transmission port of the newly connected device.
  • the optical node control unit 22 also identifies the first port of the optical forwarding unit 11 connected to the receiving port of the newly connected device based on the connection port table stored in the table storage unit 23.
  • the connection port table is a table in which information about the ports of the optical node device 10 to which each communication device 30 connects via the optical transmission path L is registered. For example, the connection port table registers information indicating the paired first port of the multiple first ports provided in the optical forwarding unit 11. Therefore, when the optical node control unit 22 identifies the first port of the optical forwarding unit 11 connected to the transmitting port of the newly connected device, it can identify the first port of the optical forwarding unit 11 paired with the identified first port as the first port connected to the receiving port of the newly connected device. In this way, the optical node control unit 22 identifies the first port of the optical forwarding unit 11 connected to the receiving port of the newly connected device.
  • connection port table will contain information indicating the paired first port from among the multiple first ports included in the wavelength distribution unit 12.
  • the table storage unit 23 stores the connection port table. Details of the connection port table will be described later.
  • the table storage unit 23 is configured using a storage device such as a magnetic storage device or semiconductor storage device.
  • the communication device 30 has a transmission port, a reception port, and an optical transceiver.
  • the transmission port is a port used to transmit optical signals.
  • the reception port is a port used to receive optical signals.
  • the optical transceiver is, for example, a coherent transceiver.
  • the communication device 30 uses the optical transceiver to send and receive optical signals such as main signals and control signals.
  • two optical transmission lines L are drawn in and connected to the transmission port and reception port of the communication device 30, respectively.
  • the user connects a pair of unused optical transmission lines L stored as a pair in the control unit 20 to the transmission port and reception port of the communication device 30.
  • the user can connect either of the pair of optical transmission lines L to the transmission port of the communication device 30.
  • a communication device 30 When a communication device 30 is newly connected to the optical node device 10 before the optical path is opened, it exchanges information necessary for registration and authentication and for opening the optical path with the control unit 20.
  • Information necessary for opening the optical path includes, for example, information about the wavelengths used for transmission and reception, and information indicating the communication device with which communication is to be performed.
  • the communication device 30 may output the upstream control signal light to the control unit 20 as an optical signal with a wavelength different from the main signal light.
  • the communication device 30 is, for example, an ONU (Optical Network Unit) installed in a subscriber's premises.
  • Figure 2 is a diagram showing an example configuration of the optical transfer unit 11 in the first embodiment.
  • Figure 2 shows a state in which communication devices 30-1 and 30-2 are connected to the optical node device 10.
  • the optical transfer unit 11 has multiple first ports 112, multiple second ports 113, and multiple optical detectors 114.
  • Figure 2 shows an example in which there are four first ports 112, second ports 113, and optical detectors 114, but the number of first ports 112, second ports 113, and optical detectors 114 may be any number.
  • the optical transfer unit 11 in the first embodiment desirably has an even number of first ports 112, second ports 113, and optical detectors 114 to accommodate one or more communication devices 30 that perform two-core transmission.
  • the communication device 30 is connected to the first port 112 of the optical transfer unit 11 via the optical transmission path L.
  • the wavelength distribution unit 12 is connected to the second port 113 of the optical transfer unit 11.
  • An optical detection unit 114 is provided for each first port 112 and detects light input to each first port 112.
  • the optical detection unit 114 is, for example, an optical intensity monitor.
  • the optical detection unit 114 is a functional unit for realizing the optical detection function described above.
  • the optical detection unit 114 detects the input of light by monitoring the intensity of the optical signal input to each first port 112.
  • the optical detection unit 114 Upon detecting the input of light, the optical detection unit 114 transmits port identification information to the control unit 20, which includes identification information for identifying the optical detection unit 114 and information indicating that the input of light has been detected (for example, a light intensity value).
  • identification information for identifying the optical detection unit 114
  • information indicating that the input of light has been detected for example, a light intensity value.
  • the optical detector 114 is built into the optical transfer unit 11, but as described above, the optical detector 114 may also be external to the optical transfer unit 11. Even when the optical detector 114 is external to the optical transfer unit 11, an optical detector 114 is provided for each first port 112.
  • the transmitting port 31-1 of the communication device 30-1 is connected to the first port 112-1 via the optical transmission path L
  • the receiving port 32-1 of the communication device 30-1 is connected to the first port 112-2 via the optical transmission path L
  • the transmitting port 31-2 of the communication device 30-2 is connected to the first port 112-4 via the optical transmission path L
  • the receiving port 32-2 of the communication device 30-2 is connected to the first port 112-3 via the optical transmission path L.
  • Figure 3 is a diagram showing an example of a connection port table in the first embodiment.
  • the connection port table shown in Figure 3 registers information indicating the relationship between a communication device and the first port of the optical node device 10.
  • the first port of the optical node device 10 is, for example, the first port 112 provided in the optical transfer unit 11.
  • the first port of the optical node device 10 is, for example, the first port 112 provided in the optical transfer unit 11.
  • the row one below the "First port of optical node device 10" item in the connection port table information for identifying the multiple first ports 112 provided in the optical transfer unit 11 is registered.
  • pair information indicating the first port 112 that forms a pair with the multiple first ports 112 provided in the optical transfer unit 11 is registered.
  • the pair information is set in advance by an administrator, etc.
  • first port 112-1 and first port 112-2 are registered as pair #1, and first port 112-3 and first port 112-4 are registered as pair #2.
  • communication device identification information for identifying a communication device recognized by the control unit 20 is registered.
  • the communication device identification information may be an identification number assigned to the communication device 30 by the control unit 20 at the time of initial connection, or may be a unique identification number for the communication device 30 declared by the communication device 30 at the time of initial connection.
  • the unique identification number for the communication device 30 is information that can uniquely identify the communication device 30, such as a MAC address or serial number.
  • the identification number for the communication device 30 may be registered at the time of initial connection or before the initial connection. When the identification number for the communication device 30 is registered before the initial connection, for example, an identification number assigned before the initial connection or a unique identification number for the communication device 30 to be connected is used.
  • connection port table is in its initial state, and when an optical input is detected in the optical node device 10, information indicating the relationship between the communication device 30 and the first port of the optical node device 10 is registered in the connection port table. For example, when a new optical input is detected at the first port 112-1 of the optical forwarding unit 11, the control unit 20 recognizes that the first port 112-1 is connected to the transmitting port 31 of a certain communication device 30 (e.g., communication device 30-1), and that the first port 112-2, which is paired with the first port 112-1, is connected to the receiving port 32 of a certain communication device 30 (e.g., communication device 30-1).
  • a certain communication device 30 e.g., communication device 30-1
  • the first port 112-2 which is paired with the first port 112-1
  • control unit 20 registers information indicating that the first port 112-1 is connected to the transmission port 31 of the communication device 30-1 in the item in the connection port table that indicates the relationship between the communication device 30-1 and the first port 112-1. Furthermore, the control unit 20 registers information indicating that the first port 112-2 is connected to the reception port 32 of the communication device 30-1 in the item in the connection port table that indicates the relationship between the communication device 30-1 and the first port 112-2.
  • FIGS. 4 and 5 are sequence diagrams showing the flow of the optical path opening process in the optical communication system 100 in the first embodiment.
  • a user connects to the optical node device 10 by connecting two optical transmission paths L to the transmitting port 31-1 and receiving port 32-1 of communication device 30-1, respectively (step S101).
  • the transmitting port 31-1 of communication device 30-1 is connected to the first port 112-1 of the optical forwarding unit 11 via the optical transmission path L
  • the receiving port 32-1 of communication device 30-1 is connected to the first port 112-2 of the optical forwarding unit 11 via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple first ports 112 of the optical transfer unit 11 the communication device 30-1 is connected to.
  • the communication device 30-1 After connecting to the optical node device 10, the communication device 30-1 generates an upstream control signal including instructions requesting authentication, registration, etc.
  • the communication device 30-1 converts the generated upstream control signal into an optical signal and transmits it from the transmission port 31-1 as an upstream control signal optical signal (step S102).
  • the upstream control signal light transmitted from the transmission port 31-1 of the communication device 30-1 is input to the first port 112-1 of the optical forwarding unit 11.
  • the optical detection unit 114-1 detects the optical input to the first port 112-1 (step S103).
  • the optical node device 10 forwards the input upstream control signal light to the control unit 20 (step S104).
  • the method for forwarding the optical signal transmitted from the new connection device to the control unit 20 may be any existing method.
  • the optical detection unit 114-1 generates port identification information and transmits a control signal including the generated port identification information to the control unit 20 via a control line (not shown) (step S105).
  • the control unit 20 receives the upstream control signal light transferred from the optical node device 10. Furthermore, the control unit 20 receives the control signal transmitted from the optical node device 10.
  • the subscriber device management control unit 21 identifies the newly connected device in response to receiving the upstream control signal light. For example, the subscriber device management control unit 21 identifies the newly connected device as communication device 30-1 based on information for identifying communication device 30-1 included in the upstream control signal light.
  • the optical node control unit 22 Based on the control signal transmitted from the optical detection unit 114-1, the optical node control unit 22 recognizes the port of the optical forwarding unit 11 to which the communication device 30-1 is connected (step S106). Specifically, the optical node control unit 22 first identifies the first port 112 of the optical forwarding unit 11 to which the transmission port 31-1 of the communication device 30-1 is connected, using identification information for identifying the optical detection unit 114, which is specified by the port identification information included in the control signal transmitted from the optical detection unit 114-1. Here, it is assumed that the optical node control unit 22 has identified the first port 112 of the optical forwarding unit 11 to which the transmission port 31-1 of the communication device 30-1 is connected as the first port 112-1, based on the identification information for identifying the optical detection unit 114.
  • the optical node control unit 22 references the connection port table stored in the table storage unit 23 and identifies the first port 112 registered as a pair with the first port 112-1.
  • the first port 112 registered as a pair with the first port 112-1 is the first port 112-2. Therefore, the optical node control unit 22 identifies that the first port 112-2 is connected to the receiving port 32-1 of the communication device 30-1. In this way, the optical node control unit 22 can identify the first ports 112 of the optical forwarding unit 11 to which the transmitting port 31-1 and receiving port 32-1 of the communication device 30-1 are respectively connected.
  • the optical node control unit 22 registers communication device identification information (here, simply referred to as "communication device 30-1") for identifying communication device 30-1 in the column immediately to the right of the "communication device” item in the connection port table. Furthermore, the optical node control unit 22 registers information indicating that the first port 112-1 is connected to the transmission port 31-1 of communication device 30-1 (e.g., (Tx)) in the item indicating the relationship between communication device 30-1 and the first port 112-1 in the connection port table.
  • communication device identification information here, simply referred to as "communication device 30-1”
  • Tx transmission port 31-1 of communication device 30-1
  • the optical node control unit 22 registers information indicating that the first port 112-2 is connected to the reception port 32-1 of communication device 30-1 (e.g., (Rx)) in the item indicating the relationship between communication device 30-1 and the first port 112-2 in the connection port table.
  • the optical node control unit 22 registers information indicating that the first port 112-2 is connected to the reception port 32-1 of communication device 30-1 (e.g., (Rx)) in the item indicating the relationship between communication device 30-1 and the first port 112-2 in the connection port table.
  • the optical node control unit 22 of the control unit 20 controls the connection relationship between the ports of the optical forwarding unit 11 so that the downstream control signal light transmitted from the control unit 20 is transmitted to the communication device 30-1 via the first port 112-2.
  • the subscriber device management and control unit 21 of the control unit 20 exchanges control signal light containing information necessary for authentication, registration, and optical path opening with the communication device 30-1 (step S107).
  • the subscriber device management and control unit 21 instructs the communication device 30-1, which is the newly connected device, to assign and set an emission wavelength so that the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 assigns wavelength ⁇ 1 to the communication device 30-1.
  • wavelength ⁇ 1 is assigned to the communication device 30-1 as an example here, another wavelength may be used as long as the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 transmits an optical signal including an emission wavelength assignment and setting instruction to the communication device 30-1 via the optical node device 10. This allows the communication device 30-1 to set the wavelength to be used for communication.
  • the optical node control unit 22 sets the connection relationship of the optical node device 10 so that the optical signal transmitted from communication device 30-1 is directed to the communication device with which it is communicating (step S108). For example, the optical node control unit 22 sets the internal port connections of the optical forwarding unit 11 so that the optical signal transmitted from communication device 30-1 is output to the wavelength distribution unit 12. Furthermore, the optical node control unit 22 sets the internal port connections of the wavelength distribution unit 12 and the WXC unit 13 so that the optical signal transmitted from communication device 30-1 is forwarded to the communication device with which it is communicating. The optical node control unit 22 transmits a control signal to the optical node device 10 to perform such settings (step S109).
  • the optical node device 10 receives the control signal sent from the control unit 20. Based on the received control signal, the optical node device 10 switches the connections between the internal ports of the optical forwarding unit 11, wavelength distribution unit 12, and WXC unit 13 (step S110). This allows an optical path to be opened so that the optical signal sent from communication device 30-1 can be forwarded to the communication device with which it is communicating.
  • step S111 assume that the user connects to the optical node device 10 by connecting two optical transmission paths L to the transmitting port 31-2 and receiving port 32-2 of communication device 30-2, respectively (step S111).
  • the transmitting port 31-2 of communication device 30-2 is connected to the first port 112-4 of the optical transfer unit 11 via the optical transmission path L
  • the receiving port 32-2 of communication device 30-2 is connected to the first port 112-3 of the optical transfer unit 11 via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple first ports 112 of the optical transfer unit 11 the communication device 30-2 is connected to.
  • the communication device 30-2 After connecting to the optical node device 10, the communication device 30-2 generates an upstream control signal including instructions requesting authentication, registration, etc.
  • the communication device 30-2 converts the generated upstream control signal into an optical signal and transmits it from the transmission port 31-2 as an upstream control signal optical signal (step S112).
  • the upstream control signal light transmitted from the transmission port 31-2 of the communication device 30-2 is input to the first port 112-4 of the optical forwarding unit 11.
  • the optical detection unit 114-4 detects the optical input to the first port 112-4 (step S113).
  • the optical node device 10 forwards the input upstream control signal light to the control unit 20 (step S114).
  • the optical detection unit 114-4 generates port identification information and transmits a control signal including the generated port identification information to the control unit 20 via a control line (not shown) (step S115).
  • the control unit 20 receives the upstream control signal light transferred from the optical node device 10. Furthermore, the control unit 20 receives the control signal transmitted from the optical node device 10.
  • the subscriber device management control unit 21 identifies the newly connected device in response to receiving the upstream control signal light. For example, the subscriber device management control unit 21 identifies the newly connected device as communication device 30-2 based on information for identifying communication device 30-2 included in the upstream control signal light.
  • the optical node control unit 22 Based on the control signal transmitted from the optical detection unit 114-4, the optical node control unit 22 recognizes the port of the optical forwarding unit 11 to which the communication device 30-2 is connected (step S116). Specifically, the optical node control unit 22 first identifies the first port 112 of the optical forwarding unit 11 to which the transmission port 31-2 of the communication device 30-2 is connected, using identification information for identifying the optical detection unit 114, which is specified by the port identification information included in the control signal transmitted from the optical detection unit 114-4. Here, it is assumed that the optical node control unit 22 has identified the first port 112 of the optical forwarding unit 11 to which the transmission port 31-2 of the communication device 30-2 is connected as the first port 112-4, using the identification information for identifying the optical detection unit 114.
  • the optical node control unit 22 references the connection port table stored in the table storage unit 23 and identifies the first port 112 registered as a pair with the first port 112-4.
  • the first port 112 registered as a pair with the first port 112-4 is the first port 112-3. Therefore, the optical node control unit 22 identifies that the first port 112-3 is connected to the receiving port 32-2 of the communication device 30-2. In this way, the optical node control unit 22 can identify the first ports 112 of the optical forwarding unit 11 to which the transmitting port 31-2 and receiving port 32-2 of the communication device 30-2 are respectively connected.
  • the optical node control unit 22 registers communication device identification information (simply referred to here as "communication device 30-2") for identifying communication device 30-2 in the column immediately to the right of the "communication device” item in the connection port table. Furthermore, the optical node control unit 22 registers information (e.g., (Tx)) indicating that the first port 112-4 is connected to the transmission port 31-2 of communication device 30-2 in the item indicating the relationship between communication device 30-2 and the first port 112-4 in the connection port table.
  • communication device identification information (simply referred to here as "communication device 30-2)
  • Tx information
  • the optical node control unit 22 registers information (e.g., (Rx)) indicating that the first port 112-3 is connected to the reception port 32-2 of communication device 30-2 in the item indicating the relationship between communication device 30-2 and the first port 112-3 in the connection port table.
  • information e.g., (Rx)
  • the optical node control unit 22 of the control unit 20 controls the connection relationship between the ports of the optical forwarding unit 11 so that the downstream control signal light transmitted from the control unit 20 is transmitted to the communication device 30-2 via the first port 112-3.
  • the subscriber device management and control unit 21 of the control unit 20 exchanges control signal light containing information necessary for authentication, registration, and optical path opening with the communication device 30-2 (step S117).
  • the subscriber device management and control unit 21 instructs the communication device 30-2, which is the newly connected device, to assign and set an emission wavelength so that the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 assigns wavelength ⁇ 2 to the communication device 30-2.
  • wavelength ⁇ 2 is assigned to the communication device 30-2 as an example here, another wavelength may be used as long as the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 transmits an optical signal including an emission wavelength assignment and setting instruction to the communication device 30-2 via the optical node device 10. This allows the communication device 30-2 to set the wavelength to be used for communication.
  • the optical node control unit 22 sets the connection relationship of the optical node device 10 so that the optical signal transmitted from communication device 30-2 is directed to the communication device with which it is communicating (step S118). For example, the optical node control unit 22 sets the internal port connections of the optical forwarding unit 11 so that the optical signal transmitted from communication device 30-2 is output to the wavelength distribution unit 12. Furthermore, the optical node control unit 22 sets the internal port connections of the wavelength distribution unit 12 and the WXC unit 13 so that the optical signal transmitted from communication device 30-2 is forwarded to the communication device with which it is communicating. The optical node control unit 22 transmits a control signal to the optical node device 10 to perform such settings (step S119).
  • the optical node device 10 receives the control signal sent from the control unit 20. Based on the received control signal, the optical node device 10 switches the connections between the internal ports of the optical forwarding unit 11, wavelength distribution unit 12, and WXC unit 13 (step S120). This allows an optical path to be opened so that the optical signal sent from communication device 30-2 can be forwarded to the communication device with which it is communicating.
  • the optical detector 114 detects the upstream control signal light transmitted by the communication device 30, but the object detected by the optical detector 114 may also be the main signal light.
  • the upstream control signal light included in the multiplexed signal light (upstream control signal light and multiplexed signal light of the main signal light) transmitted from the communication device 30 is wavelength-separated (e.g., on the communication device 30 side) before being input to the optical transfer unit 11, the control signal light is transferred to the control unit 20, and only the main signal light is input to the optical transfer unit 11.
  • the upstream control signal light included in the multiplexed signal light (upstream control signal light and multiplexed signal light of the main signal light) transmitted from the communication device 30 may be wavelength-separated (e.g., on the communication device 30 side) before being input to the optical transfer unit 11, and the control signal light may be transmitted to the control unit 20, or the downstream control signal light transmitted from the control unit 20 may be wavelength-multiplexed with the main signal light transmitted by the optical transfer unit 11 and output to the communication device 30.
  • the control unit 20 identifies one or two ports of the optical node device 10 to which the new connection device is connected based on port identification information for identifying the port that detected the optical signal transmitted from the new connection device connected to the optical node device 10 and the connection port table, and includes an optical node control unit 22 that controls the connection between the ports of the optical node device 10 based on the identified port of the optical node device 10 so that the optical signal transmitted from the new connection device is forwarded to the communication device with which it is communicating.
  • the control unit 20 can recognize the ports of the optical node device 10 to which the transmission port and reception port of the communication device 30 are connected. As a result, it becomes possible to open an optical path.
  • FIG. 7 is a diagram showing an example configuration of the optical communication system 100 in a first modification of the first embodiment.
  • the optical communication system 100 shown in FIG. 7 differs in configuration from the optical communication system 100 shown in FIG. 1 in that it includes optical node devices 10-1 and 10-2 instead of the optical node device 10.
  • the rest of the configuration is the same as that of the optical communication system 100 shown in FIG. 1. The following description will focus on the differences from the optical communication system 100 shown in FIG. 1.
  • the optical node device 10-1 is a node device that constitutes a wavelength network and accommodates one or more communication devices 30.
  • the optical node device 10-1 is used to transfer upstream signal light.
  • the optical node device 10-1 has multiple optical transfer units 11, multiple wavelength distribution units 12, and a WXC unit 13, but these are not shown in Figure 7 to simplify the explanation.
  • Figure 7 shows the first port 112-1 provided in the optical transfer unit 11 of the optical node device 10-1.
  • the optical node device 10-2 is a node device that constitutes a wavelength network and accommodates one or more communication devices 30.
  • the optical node device 10-2 is used to forward downstream signal light.
  • the optical node device 10-2 has multiple optical forwarding units 11, multiple wavelength distribution units 12, and a WXC unit 13, but these are not shown in Figure 7 to simplify the explanation.
  • Figure 7 illustrates the first port 112-2 provided in the optical forwarding unit 11 of the optical node device 10-2.
  • the transmission port 31 and reception port 32 of the communication device 30 are connected to different optical node devices 10.
  • the transmission port 31 of the communication device 30 is connected to any one of the first ports 112-1 of the optical transfer unit 11 provided in the optical node device 10-1 via the optical transmission path L.
  • the reception port 32 of the communication device 30 is connected to any one of the first ports 112-2 of the optical transfer unit 11 provided in the optical node device 10-2 via the optical transmission path L.
  • FIG. 8 is a diagram showing an example of a connection port table in Variation 1 of the first embodiment.
  • the combinations of first ports 112 registered as pairs differ from those in the connection port table shown in FIG. 3.
  • the first port 112-1-1 and the first port 112-2-1 are registered as pair #1, and the first port 112-1-2 and the first port 112-2-2 are registered as pair #2.
  • the first port 112-1-1 and the first port 112-1-2 are some of the multiple first ports 112-1 provided in the optical transfer unit 11 of the optical node device 10-1, and the first port 112-2-1 and the first port 112-2-2 are some of the multiple first ports 112-2 provided in the optical transfer unit 11 of the optical node device 10-2.
  • the first ports of the optical transfer units 11 provided in different optical node devices 10 are registered as a pair.
  • Figure 9 is a diagram showing an example configuration of an optical communication system 100 in Variation 1 of the first embodiment.
  • a user connects two optical transmission paths L to the transmission port 31-1 and reception port 32-1 of communication device 30-1, respectively, thereby connecting to optical node devices 10-1 and 10-2.
  • the transmission port 31-1 of communication device 30-1 is connected to the first port 112-1-1 of the optical transfer unit 11 of optical node device 10-1 via the optical transmission path L
  • the reception port 32-1 of communication device 30-1 is connected to the first port 112-2-1 of the optical transfer unit 11 of optical node device 10-2 via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple first ports 112-1 of the optical transfer unit 11 of the optical node device 10-1 the communication device 30-1 is connected to, or which of the multiple first ports 112-2 of the optical transfer unit 11 of the optical node device 10-2 the communication device 30-1 is connected to.
  • the communication device 30-1 After connecting to the optical node devices 10-1 and 10-2, the communication device 30-1 generates an upstream control signal that includes instructions requesting authentication, registration, etc.
  • the communication device 30-1 converts the generated upstream control signal into an optical signal and transmits it from the transmission port 31-1 as an upstream control signal optical signal.
  • the upstream control signal light transmitted from the transmission port 31-1 of the communication device 30-1 is input to the first port 112-1-1 provided in the optical forwarding unit 11 of the optical node device 10-1.
  • the optical detection unit 114-1-1 detects the optical input to the first port 112-1-1.
  • the optical node device 10-1 forwards the input upstream control signal light to the control unit 20.
  • the optical detection unit 114-1-1 generates port identification information and transmits a control signal including the generated port identification information to the control unit 20 via a control line (not shown).
  • the optical detector 114 detects the upstream control signal light transmitted by the communication device 30, but the object detected by the optical detector 114 may also be the main signal light.
  • the upstream control signal light included in the multiplexed signal light (upstream control signal light and multiplexed signal light of the main signal light) transmitted from the communication device 30 is wavelength-separated (e.g., on the communication device 30 side) before being input to the optical transfer unit 11, the control signal light is transferred to the control unit 20, and only the main signal light is input to the optical transfer unit 11.
  • the control unit 20 receives the upstream control signal light transferred from the optical node device 10-1. Furthermore, the control unit 20 receives the control signal transmitted from the optical node device 10-1.
  • the subscriber device management control unit 21 identifies the newly connected device in response to receiving the upstream control signal light. For example, the subscriber device management control unit 21 identifies the newly connected device as communication device 30-1 based on information for identifying communication device 30-1 included in the upstream control signal light.
  • the optical node control unit 22 Based on the control signal transmitted from the optical detection unit 114-1-1, the optical node control unit 22 recognizes the port of the optical forwarding unit 11 of the optical node device 10-1 to which the communication device 30-1 is connected. Specifically, the optical node control unit 22 first identifies the first port 112 of the optical forwarding unit 11 of the optical node device 10-1 to which the transmission port 31-1 of the communication device 30-1 is connected, using the identification information for identifying the optical detection unit 114, which is specified by the port identification information included in the control signal transmitted from the optical detection unit 114-1-1.
  • the optical node control unit 22 has determined, based on the identification information for identifying the optical detection unit 114, that the first port 112 of the optical forwarding unit 11 of the optical node device 10-1 to which the transmission port 31-1 of the communication device 30-1 is connected is the first port 112-1-1.
  • the optical node control unit 22 references the connection port table stored in the table storage unit 23 and identifies the first port 112 registered as a pair with the first port 112-1-1.
  • the first port 112 registered as a pair with the first port 112-1-1 is the first port 112-2-1. Therefore, the optical node control unit 22 identifies that the first port 112-2-1 of the optical forwarding unit 11 of the optical node device 10-2 is connected to the receiving port 32-1 of the communication device 30-1. In this way, the optical node control unit 22 can identify the first ports 112 of the optical forwarding unit 11 to which the transmitting port 31-1 and receiving port 32-1 of the communication device 30-1 are respectively connected.
  • the optical node control unit 22 registers communication device identification information (here, simply referred to as "communication device 30-1") for identifying communication device 30-1 in the column immediately to the right of the "communication device” item in the connection port table. Furthermore, the optical node control unit 22 registers information (e.g., (Tx)) indicating that the first port 112-1-1 is connected to the transmission port 31-1 of communication device 30-1 in the item indicating the relationship between communication device 30-1 and the first port 112-1-1 in the connection port table.
  • communication device identification information here, simply referred to as "communication device 30-1
  • information e.g., (Tx)
  • the optical node control unit 22 registers information (e.g., (Rx)) indicating that the first port 112-2-1 is connected to the reception port 32-1 of communication device 30-1 in the item indicating the relationship between communication device 30-1 and the first port 112-2-1 in the connection port table.
  • information e.g., (Rx)
  • connection port table By performing the same process as described above for communication device 30-2, the information shown in FIG. 10 is registered in the connection port table.
  • the control unit 20 controls the connection relationship between the optical node devices 10-1 and 10-2 based on the information registered in the connection port table, thereby opening an optical path between each communication device 30 and its communication partner communication device.
  • the optical communication system 100 shown in Modification 1 may be configured to separately manage an optical transmission line LU for upstream signal light and an optical transmission line LD for downstream signal light, as shown in Fig. 11.
  • Fig. 11 is a diagram showing an example of the configuration of the optical communication system 100 in Modification 2 of the first embodiment.
  • the configuration shown in Fig. 11 is similar to Modification 1 in terms of specific processing except that the optical transmission line L is separated into an optical transmission line LU for upstream signal light and an optical transmission line LD for downstream signal light, and therefore a description thereof will be omitted.
  • FIG. 12 is a diagram showing a configuration example of an optical communication system 100a in Modification 3 of the first embodiment.
  • the optical communication system 100a includes an optical node device 10a and a control unit 20.
  • One or more communication devices 30 are connected to the optical node device 10a via an optical transmission path L.
  • the optical communication system 100a differs in configuration from the optical communication system 100 in that the optical node device 10a is provided instead of the optical node device 10.
  • Other configurations of the optical communication system 100a are similar to those of the optical communication system 100. The following description will focus on the differences from the optical communication system 100.
  • the optical node device 10a is a node device that constitutes a wavelength network and accommodates one or more communication devices 30.
  • the optical node device 10a comprises multiple optical transfer units 11, a WXC unit 13, and multiple wavelength multiplexing/demultiplexing units 15.
  • the optical node device 10a comprises multiple wavelength multiplexing/demultiplexing units 15 instead of multiple wavelength distribution units 12.
  • Each wavelength multiplexing/demultiplexing unit 15 is connected to a different wavelength multiplexing unit 131 or wavelength demultiplexing unit 132.
  • each wavelength multiplexing/demultiplexing unit 15 used for upstream communication is connected to a different wavelength multiplexing unit 131-1, 131-2, and each wavelength multiplexing/demultiplexing unit 15 used for downstream communication is connected to a different wavelength demultiplexing unit 132-1, 132-2.
  • the wavelength multiplexing/demultiplexing unit 15 used for upstream communications multiplexes one or more optical signals transferred from the optical transfer unit 11 and outputs the result to the connected wavelength multiplexing unit 131.
  • the wavelength multiplexing/demultiplexing unit 15 used for downstream communications demultiplexes the optical signal (e.g., a multiplexed signal) output from the WXC unit 13 and outputs the result to the optical transfer unit 11.
  • the optical transfer unit 11 transfers the optical signal sent from the communication device 30 to a port of the wavelength multiplexing/demultiplexing unit 15 corresponding to the wavelength, and then the wavelength multiplexing/demultiplexing unit 15 wavelength-multiplexes the optical signal to be output to the same path.
  • the wavelength multiplexing/demultiplexing unit 15 demultiplexes the wavelength-multiplexed optical signal output from the WXC unit 13 by wavelength, and the optical transfer unit 11 transfers the optical signal to a port on the communication device side according to the destination.
  • the optical node device 10a can achieve an optical detection function for each first port 112 by using the optical detection unit 114 to monitor the input optical intensity to each first port 112 of the optical transfer unit 11.
  • the optical detection function of the optical transfer unit 11 can be achieved by having an optical intensity monitor built into each first port of the optical transfer unit 11, or by attaching an external optical intensity monitor to each first port of the optical transfer unit 11. Note that although the optical node device 10a has multiple optical transfer units 11-1 and 11-2, it may also be configured so that a single optical transfer unit 11 transfers both upstream and downstream signal light.
  • Second Embodiment In the first embodiment, a case where a communication device connected to an optical node device is a communication device that performs two-core transmission has been described as an example. In an optical access network, it is assumed that not only communication devices that perform two-core transmission but also communication devices that perform single-core bidirectional transmission will be connected to optical node devices. Therefore, in the second embodiment, a configuration will be described in which both a communication device that performs two-core transmission and a communication device that performs single-core bidirectional transmission are connected to the same optical node device.
  • FIG. 13 is a diagram showing an example configuration of an optical communication system 100b in the second embodiment.
  • the optical communication system 100b includes an optical node device 10 and a control unit 20b.
  • One or more communication devices 30 are connected to the optical node device 10 via an optical transmission path L.
  • the optical communication system 100b in the second embodiment will be described taking as an example a case where one or more communication devices 30 perform two-core transmission or single-core bidirectional transmission.
  • a communication device 30 performing two-core transmission is connected to the optical node device 10 via different optical transmission paths L for transmission and reception.
  • a communication device 30 performing single-core bidirectional transmission is connected to the optical node device 10 via the same optical transmission path L for transmission and reception.
  • the optical node device 10 includes multiple optical transfer units 11, multiple wavelength distribution units 12, and a WXC unit 13, but these are not shown in Figure 13 to simplify the explanation.
  • Figure 13 illustrates the first port 112 included in the optical transfer unit 11 in the optical node device 10.
  • Communication device 30 performs two-core transmission or single-core bidirectional transmission.
  • a communication device 30 performing two-core transmission has a transmission port 31, a reception port 32, and an optical transceiver.
  • a communication device 30 performing single-core bidirectional transmission has a transmission/reception port 33 and an optical transceiver.
  • the transmission/reception port 33 is a port used for both sending and receiving optical signals.
  • Figure 13 shows a case where communication device 30-1 is a communication device performing two-core transmission, and communication device 30-2 is a communication device performing single-core bidirectional transmission.
  • connection When connecting a communication device 30 for two-core transmission to an optical node device 10, the connection can be made in the same manner as in the first embodiment.
  • one of the unused optical transmission paths L is pulled in and connected to the transmission/reception port of the communication device 30.
  • the control unit 20b needs to know whether the newly connected device is a communication device for single-core bidirectional transmission or a communication device for dual-core transmission. Therefore, in the second embodiment, the communication device 30 declares the type of transmission method (single-core bidirectional transmission or dual-core transmission) when exchanging control signals with the control unit 20b for authentication and registration.
  • the control unit 20b performs the same processing as in the first embodiment. Furthermore, if the control unit 20b recognizes that the new connecting device is a communication device for single-core bidirectional transmission based on the type of transmission method included in the upstream control signal light transmitted from the new connecting device, it recognizes that the transmit/receive port 33 of the new connecting device is connected to the first port 112 of the optical transfer unit 11 that detected the optical input.
  • the control unit 20b references the connection port table and dissolves the pairing of the port registered as a pair with the first port 112 to which the transmit/receive port 33 of the communication device 30 for single-fiber bidirectional transmission is connected. Because the other first port 112 from which the pairing has been dissolved remains unused, it becomes possible to pull in and connect the optical transmission path L that connects to this port when connecting another single-fiber bidirectional communication device.
  • communication device 30-1 is a communication device for two-core transmission
  • communication device 30-2 is a communication device for one-core bidirectional transmission, as shown in FIG. 13.
  • the connection port recognition process for communication device 30-1 is basically the same as the process from steps S101 to S110 in FIG. 4, except that communication device 30-1 includes the type of transmission method (two-core transmission) in the upstream control signal light when transmitting it, and therefore a description thereof will be omitted.
  • the transmission/reception port 33-2 of the communication device 30-2 is connected to the first port 112-4 of the optical forwarding unit 11 provided in the optical node device 10 via the optical transmission path L.
  • the control unit 20b cannot determine which of the multiple first ports 112 of the optical transfer unit 11 the communication device 30-2 is connected to.
  • the communication device 30-2 After connecting to the optical node device 10, the communication device 30-2 generates an upstream control signal that includes instructions requesting authentication and registration, etc., and the type of transmission method (for example, single-core bidirectional transmission).
  • the communication device 30-2 converts the generated upstream control signal into an optical signal and transmits it from the transmission/reception port 33-2 as an upstream control signal optical signal.
  • the upstream control signal light transmitted from the transmission/reception port 33-2 of the communication device 30-2 is input to the first port 112-4 of the optical forwarding unit 11.
  • the optical detection unit 114-4 detects the optical input to the first port 112-4.
  • the optical node device 10 forwards the input upstream control signal light to the control unit 20b.
  • the optical detection unit 114-4 generates port identification information and transmits a control signal including the generated port identification information to the control unit 20b via a control line (not shown).
  • the control unit 20b receives the upstream control signal light transferred from the optical node device 10. Furthermore, the control unit 20b receives the control signal transmitted from the optical node device 10.
  • the subscriber device management control unit 21 identifies the new connection device in response to receiving the upstream control signal light. For example, the subscriber device management control unit 21 identifies the new connection device as communication device 30-2 based on information for identifying communication device 30-2 included in the upstream control signal light. Furthermore, the subscriber device management control unit 21 identifies the new connection device as a communication device that performs single-core bidirectional transmission based on the type of transmission method included in the upstream control signal light.
  • the optical node control unit 22 recognizes the port of the optical forwarding unit 11 to which the communication device 30-2 is connected based on the control signal transmitted from the optical detection unit 114-4. Specifically, the optical node control unit 22 first identifies the first port 112 of the optical forwarding unit 11 to which the transmission/reception port 33-2 of the communication device 30-2 is connected, based on the identification information for identifying the optical detection unit 114, which is specified by the port identification information contained in the control signal transmitted from the optical detection unit 114-4.
  • the optical node control unit 22 has identified the first port 112 of the optical forwarding unit 11 to which the transmission/reception port 33-2 of the communication device 30-2 is connected as the first port 112-4, based on the identification information for identifying the optical detection unit 114.
  • the optical node control unit 22 references the connection port table stored in the table storage unit 23 and identifies the first port 112 registered as a pair with the first port 112-4. For example, assume that the first port 112-3 is registered as a pair with the first port 112-4 in the connection port table. Because the subscriber device management control unit 21 identifies the communication device 30-2 as a communication device performing single-core bidirectional transmission, the optical node control unit 22 cancels the pairing of the first port 112-3 registered as a pair with the first port 112-4. As a result, the optical node control unit 22 deletes the pair information for the first port 112-3 and the first port 112-4 (indicated by "-" in FIG. 14), as shown in FIG. 14.
  • the optical node control unit 22 registers communication device identification information (simply referred to as "communication device 30-2" here) for identifying communication device 30-2 in the column immediately to the right of the "communication device” item in the connection port table. Furthermore, the optical node control unit 22 registers information indicating that the first port 112-4 is connected to the transmission/reception port 33-2 of communication device 30-2 (for example, (TRx)) in the item in the connection port table that indicates the relationship between communication device 30-2 and the first port 112-4.
  • communication device identification information (simply referred to as "communication device 30-2" here) for identifying communication device 30-2 in the column immediately to the right of the "communication device” item in the connection port table.
  • the optical node control unit 22 registers information indicating that the first port 112-4 is connected to the transmission/reception port 33-2 of communication device 30-2 (for example, (TRx)) in the item in the connection port table that indicates the relationship between communication device 30-2 and the first port 112-4.
  • the optical node control unit 22 of the control unit 20b controls the connection relationship between the ports of the optical forwarding unit 11 so that the downstream control signal light transmitted from the control unit 20b is transmitted to the communication device 30-2 via the first port 112-4.
  • the subscriber device management and control unit 21 of the control unit 20b exchanges control signal light containing information necessary for authentication, registration, and optical path opening with the communication device 30-2.
  • the subscriber device management and control unit 21 instructs the communication device 30-2, which is the newly connected device, to assign and set an emission wavelength so that the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 assigns wavelength ⁇ 2 to the communication device 30-2.
  • wavelength ⁇ 2 is assigned to the communication device 30-2 as an example here, another wavelength may be used as long as the wavelength does not overlap with other optical paths along the transmission path.
  • the subscriber device management and control unit 21 transmits an optical signal including an emission wavelength assignment and setting instruction to the communication device 30-2 via the optical node device 10. This allows the communication device 30-2 to set the wavelength to be used for communication.
  • the optical node control unit 22 sets the connection relationships of the optical node device 10 so that the optical signal transmitted from communication device 30-2 is directed to the communication device with which it is communicating. For example, the optical node control unit 22 sets the internal port connections of the optical forwarding unit 11 so that the optical signal transmitted from communication device 30-2 is output toward the wavelength distribution unit 12. Furthermore, the optical node control unit 22 sets the internal port connections of the wavelength distribution unit 12 and the WXC unit 13 so that the optical signal transmitted from communication device 30-2 is forwarded to the communication device with which it is communicating. The optical node control unit 22 transmits a control signal to the optical node device 10 to perform such settings.
  • the optical node device 10 receives the control signal sent from the control unit 20b. Based on the received control signal, the optical node device 10 switches the connections between the internal ports of the optical forwarding unit 11, wavelength distribution unit 12, and WXC unit 13. This allows an optical path to be opened so that the optical signal sent from communication device 30-2 can be forwarded to the communication device with which it is communicating.
  • the user connects to the optical node device 10 by connecting one optical transmission path L to the transmission/reception port 33-3 of the communication device 30-3.
  • the transmission/reception port 33-3 of the communication device 30-3 is connected to the first port 112-3 of the optical forwarding unit 11 provided in the optical node device 10 via the optical transmission path L.
  • the communication device 30-3 After connecting to the optical node device 10, the communication device 30-3 generates an upstream control signal that includes instructions requesting authentication and registration, etc., and the type of transmission method (for example, single-core bidirectional transmission).
  • the communication device 30-3 converts the generated upstream control signal into an optical signal and transmits it from the transmission/reception port 33-3 as an upstream control signal optical signal.
  • the upstream control signal light transmitted from the transmission/reception port 33-3 of the communication device 30-3 is input to the first port 112-3 of the optical forwarding unit 11.
  • the optical detection unit 114-3 detects the optical input to the first port 112-3.
  • the optical node device 10 forwards the input upstream control signal light to the control unit 20b.
  • the optical detection unit 114-3 generates port identification information and transmits a control signal including the generated port identification information to the control unit 20b via a control line (not shown).
  • the control unit 20b receives the upstream control signal light transferred from the optical node device 10. Furthermore, the control unit 20b receives the control signal transmitted from the optical node device 10.
  • the subscriber device management control unit 21 identifies the new connection device in response to receiving the upstream control signal light. For example, the subscriber device management control unit 21 identifies the new connection device as communication device 30-3 based on information for identifying communication device 30-2 included in the upstream control signal light. Furthermore, the subscriber device management control unit 21 identifies the new connection device as a communication device that performs single-core bidirectional transmission based on the type of transmission method included in the upstream control signal light.
  • the optical node control unit 22 recognizes the port of the optical forwarding unit 11 to which the communication device 30-3 is connected based on the control signal transmitted from the optical detection unit 114-3. Specifically, the optical node control unit 22 first identifies the first port 112 of the optical forwarding unit 11 to which the transmission/reception port 33-3 of the communication device 30-3 is connected, based on the identification information for identifying the optical detection unit 114, which is specified by the port identification information contained in the control signal transmitted from the optical detection unit 114-3.
  • the optical node control unit 22 has identified the first port 112 of the optical forwarding unit 11 to which the transmission/reception port 33-3 of the communication device 30-2 is connected as the first port 112-3, based on the identification information for identifying the optical detection unit 114.
  • the optical node control unit 22 references the connection port table stored in the table storage unit 23 and identifies the first port 112 registered as a pair with the first port 112-3.
  • the pairing of the first port 112-3 has been canceled through the above-described processing. Therefore, the optical node control unit 22 determines that there is no first port 112 registered as a pair with the first port 112-3.
  • the optical node control unit 22 registers communication device identification information (simply referred to here as "communication device 30-3") for identifying communication device 30-3 in the column immediately to the right of the "communication device” item in the connection port table. Furthermore, the optical node control unit 22 registers information indicating that the first port 112-3 is connected to the transmission/reception port 33-3 of communication device 30-3 (for example, (TRx)) in the item in the connection port table that indicates the relationship between communication device 30-3 and the first port 112-3. Thereafter, the optical node control unit 22 in the control unit 20b controls the connection relationship between the ports of the optical forwarding unit 11 so that the downstream control signal light transmitted from the control unit 20b is forwarded to communication device 30-3 via the first port 112-3. The subsequent processing is the same as for communication device 30-2, so a description thereof will be omitted.
  • communication device identification information for identifying communication device 30-3 in the column immediately to the right of the "communication device” item in the connection port table.
  • the optical node control unit 22 registers information indicating that
  • the optical detector 114 detects the upstream control signal light transmitted by the communication device 30, but the object detected by the optical detector 114 may also be the main signal light.
  • the upstream control signal light included in the multiplexed signal light (upstream control signal light and multiplexed signal light of the main signal light) transmitted from the communication device 30 is wavelength-separated (e.g., on the communication device 30 side) before being input to the optical transfer unit 11, the control signal light is transferred to the control unit 20b, and only the main signal light is input to the optical transfer unit 11.
  • the upstream control signal light included in the multiplexed signal light (upstream control signal light and multiplexed signal light of the main signal light) transmitted from the communication device 30 may be wavelength-separated (e.g., on the communication device 30 side) before being input to the optical transfer unit 11, and the control signal light may be transmitted to the control unit 20b, or the downstream control signal light transmitted from the control unit 20b may be wavelength-multiplexed with the main signal light transmitted by the optical transfer unit 11 and output to the communication device 30.
  • the optical communication system 100b configured as described above, even when a communication device 30 performing single-fiber bidirectional transmission is newly connected to an optical node device 10, the port of the optical node device 10 to which the transmission/reception port of the communication device 30 is connected can be recognized. Therefore, even when a communication device 30 performing two-fiber transmission and a communication device 30 performing single-fiber bidirectional transmission are newly connected to the same optical node device 10 in the optical communication system 100b, the port of the optical node device 10 to which the newly connected device is connected can be recognized. This makes it possible to open an optical path regardless of the type of transmission method used by the communication devices.
  • control unit 20b in response to a declaration from a new connection device at the time of initial connection, it is determined whether the new connection device is a communication device for single-fiber bidirectional transmission or a communication device for dual-fiber transmission. In this way, it is possible to easily determine whether the new connection device is a communication device for single-fiber bidirectional transmission or a communication device for dual-fiber transmission. As a result, control unit 20b can update the connection port table as necessary.
  • the optical communication system 100b by canceling the pairing of a port connected to a communication device for single-fiber bidirectional transmission and allowing the remaining unused port to be connected to another communication device for single-fiber bidirectional transmission, it is possible to use the ports of the optical node device 10 efficiently in a configuration that accommodates a mixture of ports for connection to communication devices for two-fiber transmission and communication devices for single-fiber bidirectional transmission.
  • optical path opening method of the present invention there is no need to manage the ports of the optical transfer unit 11 in the optical node device 10 separately as ports for connection to communication devices 30 that perform two-core transmission and ports for connection to communication devices that perform single-core bidirectional transmission. Therefore, new communication devices can be connected to unused ports regardless of the type of transmission method used by the communication devices. This improves convenience.
  • the optical communication system 100b in the second embodiment may be configured as in any one of the first to third modifications of the first embodiment.
  • control units 20, 20b in the above-described embodiments may be implemented by a computer.
  • a program for implementing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed.
  • computer system here includes hardware such as the OS (Operating System) and peripheral devices.
  • “computer-readable recording medium” refers to portable media such as flexible disks, optical magnetic disks, ROMs (Read Only Memory), and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Furthermore, “computer-readable recording medium” may also include devices that dynamically store programs for a short period of time, such as communication lines when transmitting programs over networks such as the Internet or communication lines such as telephone lines, or devices that store programs for a fixed period of time, such as volatile memory within the computer systems that serve as servers or clients in such cases.
  • the above-mentioned programs may be those that implement some of the functions described above, or may be those that can realize the functions described above in combination with programs already stored in the computer system, or may be those that are realized using programmable logic devices such as FPGAs (Field Programmable Gate Arrays).
  • FPGAs Field Programmable Gate Arrays
  • This invention can be applied to technology for opening optical paths.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computing Systems (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un dispositif de commande comprenant une unité de commande de nœud optique qui : identifie, sur la base d'informations d'identification de port pour identifier un port qui a détecté un signal optique qui a été transmis à partir d'au moins un dispositif de communication nouvellement connecté à au moins un dispositif de nœud optique qui comprend une pluralité de ports auxquels un dispositif de communication effectuant une transmission bidirectionnelle à cœur unique ou une transmission à deux cœurs est connecté et sur la base d'informations de gestion de port dans lesquelles une paire de ports parmi la pluralité de ports inclus dans le ou les dispositifs de nœud optique sont enregistrés en tant que paire, un ou deux ports du dispositif de nœud optique auquel le ou les dispositifs de communication nouvellement connectés sont connectés; et commande, sur la base du ou des ports identifiés du dispositif de nœud optique, une connexion entre des ports du dispositif de nœud optique de telle sorte que le signal optique qui a été transmis à partir du ou des dispositifs de communication nouvellement connectés est transféré à un dispositif de communication qui sert de contrepartie de communication.　
PCT/JP2024/017780 2024-05-14 2024-05-14 Dispositif de commande, système de communication optique et procédé d'ouverture de trajet optique Pending WO2025238708A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019169813A (ja) * 2018-03-22 2019-10-03 株式会社東京シー・エム・シー 光回線ルート設計支援システム
WO2021131202A1 (fr) * 2019-12-26 2021-07-01 日本電信電話株式会社 Dispositif de communication optique, système de communication optique et procédé de communication optique
WO2023084763A1 (fr) * 2021-11-15 2023-05-19 日本電信電話株式会社 Procédé d'ouverture de trajet de communication optique et dispositif de commande de gestion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019169813A (ja) * 2018-03-22 2019-10-03 株式会社東京シー・エム・シー 光回線ルート設計支援システム
WO2021131202A1 (fr) * 2019-12-26 2021-07-01 日本電信電話株式会社 Dispositif de communication optique, système de communication optique et procédé de communication optique
WO2023084763A1 (fr) * 2021-11-15 2023-05-19 日本電信電話株式会社 Procédé d'ouverture de trajet de communication optique et dispositif de commande de gestion

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