WO2026009286A1 - Dispositif de nœud optique, émetteur-récepteur et procédé de connexion - Google Patents

Dispositif de nœud optique, émetteur-récepteur et procédé de connexion

Info

Publication number
WO2026009286A1
WO2026009286A1 PCT/JP2024/023794 JP2024023794W WO2026009286A1 WO 2026009286 A1 WO2026009286 A1 WO 2026009286A1 JP 2024023794 W JP2024023794 W JP 2024023794W WO 2026009286 A1 WO2026009286 A1 WO 2026009286A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication devices
control signal
signal light
transmission
port
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/JP2024/023794
Other languages
English (en)
Japanese (ja)
Inventor
康隆 木村
淳一 可児
慎 金子
智暁 吉田
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/JP2024/023794 priority Critical patent/WO2026009286A1/fr
Publication of WO2026009286A1 publication Critical patent/WO2026009286A1/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
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • the present invention relates to optical node devices, transceivers, and connection methods.
  • FIGs 5 and 6 are diagrams explaining how an optical path is opened in a conventional optical communication system S.
  • the conventional optical communication system S includes 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 in which control signal light is transmitted and received using a wavelength different from the main signal light, or a configuration in which a low-speed control signal called an AMCC (Auxiliary Management and Control Channel) is superimposed, can be used.
  • the AMCC signal includes status information indicating, for example, the transmission and reception wavelengths, transmission 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, as shown in FIG. 6, so that optical signals transmitted from the newly connected device, communication device 200-1, are forwarded to the communication device 300 (e.g., communication device 300-1) that will be the communication partner.
  • the control unit 400-2 changes the port connection settings of the optical node device 500-2 so that optical signals transmitted from communication device 200-1 are 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. 6.
  • Figure 7 has been proposed as a configuration for exchanging control signals between the communication devices 200, 300 and the control unit 400 (see, for example, Non-Patent Document 1).
  • Figure 7 shows an example of a configuration for exchanging control signals between the communication device 200 and the control unit 400.
  • control signal light is transmitted and received between the communication device 200 and the control unit 400 using a wavelength different from that of the main signal light, and the control signal light is wavelength-multiplexed with the main signal light in the section between the communication device 200 and the optical node device and transmitted over the same optical transmission path.
  • a coherent transceiver When a coherent transceiver is used as the optical transceiver for a communication device, it is generally necessary to connect the communication device 200 and the optical node device 500 with two optical transmission paths, and to adopt a two-core transmission network configuration in which the upstream signal light and the downstream signal light are transmitted over different optical transmission paths.
  • the transmitting port of the communication device 200 and the port of the optical node device are connected by one optical transmission path
  • the receiving port of the communication device 200 and the port of the optical node device are connected by one optical transmission path.
  • 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.
  • a communication device 200-1 performing two-core transmission wavelength-multiplexes an upstream control signal light of wavelength ⁇ 1 and a main signal light of wavelength ⁇ 2 using a wavelength multiplexing/demultiplexing unit (not shown) on the transmitting port side and sends out the multiplexed signals. Also, the communication device 200-1 receives a downstream control signal light of wavelength ⁇ 1 and a main signal light of wavelength ⁇ 2 separated by a wavelength multiplexing/demultiplexing unit (not shown) on the receiving port side.
  • the optical node device 500 includes a wavelength multiplexing/demultiplexing unit 530 that multiplexes/demultiplexes the main signal light and the control signal light on the access port side to which each communication device 200 is connected.
  • the separated upstream control signal light is then received by a receiver of the control transceiver 520.
  • a downstream control signal light with wavelength ⁇ 1 output from a transmitter of the same control transceiver 520 that receives the upstream control signal light is wavelength-multiplexed with the main signal light with wavelength ⁇ 2 by the wavelength multiplexing/demultiplexing unit 530 and transmitted toward the communication device 200-1.
  • one type of optical transceiver for communication devices is a single-fiber bidirectional transmission optical transceiver, which transmits upstream and downstream signal light of different wavelengths over a single optical transmission path. If communication devices 200-2 and 200-3 equipped with this type of optical transceiver and performing single-fiber bidirectional transmission are connected to an optical node device 500, either the communication device 200 performing single-fiber bidirectional transmission or the optical node device 500 will be unable to receive control signal light.
  • the communication device 200-2 is connected via an optical transmission path to a wavelength multiplexing/demultiplexing unit 530 to which the transmitter of the control transceiver 520 provided in the optical node device 500 is connected.
  • the communication device 200-2 can receive downstream control signal light transmitted from the optical node device 500.
  • the optical node device 500 cannot receive upstream control signal light transmitted from the communication device 200-2.
  • the communication device 200-3 is connected via an optical transmission path to a wavelength multiplexing/demultiplexing unit 530 to which a receiver of a control transceiver 520 provided in the optical node device 500 is connected.
  • the optical node device 500 can receive upstream control signal light transmitted from the communication device 200-3.
  • the communication device 200-3 cannot receive downstream control signal light transmitted from the optical node device 500.
  • the conventional control signal light transmission/reception configuration shown in FIG. 7 has a problem in that the communication device 200 performing single-core bidirectional transmission cannot exchange control signals with the control unit 400. 00, there was a problem that control signals could not be exchanged between them.
  • the present invention aims to provide technology that enables signals to be exchanged with a control unit regardless of the type of transmission method used by the communication device.
  • One aspect of the present invention is an optical node device provided between one or more communication devices that perform single-core bidirectional transmission or dual-core transmission and a control device that controls the one or more communication devices, the optical node device comprising: a plurality of ports to which the one or more communication devices are connected; and one or more transceivers that are connected to at least one port via at least one first wavelength multiplexing/demultiplexing unit that multiplexes or demultiplexes input optical signals, and that transmit and receive control signal light to and from the one or more communication devices, wherein the one or more transceivers comprise: one or more timing control units that adjust the transmission timing of control signals between the one or more communication devices when the one or more communication devices are communication devices that perform single-core bidirectional transmission; one or more transmitters that send downstream control signal light addressed to the one or more communication devices at the transmission timing adjusted by the one or more timing control units when the one or more communication devices are communication devices that perform single-core bidirectional transmission; and one or more second wavelength multiplexing/demultiplexing units that
  • One aspect of the present invention is a transceiver comprising: one or more timing control units that adjust the transmission timing of control signals between one or more connected communication devices when the one or more connected communication devices are communication devices that perform single-core bidirectional transmission; one or more transmitters that send downstream control signal light addressed to the one or more communication devices at the transmission timing adjusted by the one or more timing control units when the one or more connected communication devices are communication devices that perform single-core bidirectional transmission; and one or more second wavelength multiplexers/demultiplexers that output the downstream control signal light sent from the one or more transmitters to a first wavelength multiplexer/demultiplexer to which the one or more communication devices are connected.
  • One aspect of the present invention is a connection method performed by an optical node device provided between one or more communication devices that perform single-fiber bidirectional transmission or dual-fiber transmission and a control device that controls the one or more communication devices, wherein one or more transceivers that are connected to at least one of a plurality of ports to which the one or more communication devices are connected via at least one first wavelength multiplexing/demultiplexing unit that multiplexes or demultiplexes input optical signals and that transmit and receive control signal light to and from the one or more communication devices adjust the transmission timing of control signals between the one or more communication devices if the one or more communication devices are communication devices that perform single-fiber bidirectional transmission, and send downstream control signal light addressed to the one or more communication devices at the adjusted transmission timing if the one or more communication devices are communication devices that perform single-fiber bidirectional transmission, and output the downstream control signal light sent from the one or more transmitters to at least one first wavelength multiplexing/demultiplexing unit connected to the one or more transceivers.
  • This invention makes it possible to exchange signals with the control unit regardless of the type of transmission method used by the communication device.
  • FIG. 1 is a diagram illustrating an example of the configuration of an optical communication system according to a first embodiment.
  • 1A and 1B are diagrams for explaining an initial connection method performed by an optical communication system according to a first embodiment.
  • FIG. 4 is a sequence diagram showing a processing flow of an initial connection method performed by the optical communication system according to the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration example of an optical communication system according to a 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 for explaining a problem in a conventional optical communication system.
  • Fig. 1 is a diagram showing an example of the configuration of an optical communication system 100 in 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, 40 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.
  • three communication devices 30, 40 are connected to the optical node device 10 via the optical transmission path L, but the number of communication devices 30, 40 may be one or more.
  • the communication device 30 is a device that performs two-core transmission
  • the communication devices 40-1 and 40-2 are devices that perform single-core bidirectional transmission.
  • the communication device 30 that performs two-core transmission is connected to the optical node device 10 via different optical transmission paths L (two optical transmission paths L) for transmission and reception.
  • the communication devices 40-1 and 40-2 that perform single-core bidirectional transmission are connected to the optical node device 10 via the same optical transmission path L (one optical transmission path L) for transmission and reception.
  • the optical communication system 100 may include multiple optical node devices and multiple control units as shown in Figure 5.
  • the optical communication system 100 may include a control unit for each optical node device, or may include 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 path L at a port different from the port to which one communication device 30, 40 is connected. The same applies to the following embodiments.
  • the direction from the communication devices 30, 40 toward the control unit 20 is referred to as the upstream direction, and the direction from the control unit 20 toward the communication devices 30, 40 is referred to as the downstream direction.
  • the number of optical node devices 10 There is no particular limitation on the number of optical node devices 10.
  • the optical node device 10 is a node device that constitutes a wavelength network and accommodates one or more communication devices 30, 40.
  • the optical node device 10 includes multiple ports 11, multiple wavelength multiplexing/demultiplexing units 12, and multiple control transceivers 13.
  • Fig. 1 only shows the configuration of the optical node device 10 for transmitting and receiving control signal light between the control unit 20 and each of the communication devices 30, 40.
  • the optical node device 10 also includes a forwarding function for forwarding optical signals to other optical node devices or communication devices.
  • One or more communication devices 30, 40 are connected to the multiple ports 11 via optical transmission paths L. Since the communication device 30 is a device that performs two-core transmission, it is connected to two ports 11 via two optical transmission paths L. In the example shown in Figure 1, the communication device 30 is connected to ports 11-1 and 11-2 via two optical transmission paths L.
  • communication devices 40-1 and 40-2 are devices that perform single-core bidirectional transmission, they are connected to one port 11 via one optical transmission path L.
  • communication device 40-1 is connected to port 11-4 via one optical transmission path L.
  • Communication device 40-2 is connected to port 11-5 via one optical transmission path L.
  • each communication device 30, 40 may be connected to any port 11 provided on the optical node device 10.
  • Wavelength multiplexing/demultiplexing unit 12 is installed for each port 11 and connected to a different control transceiver 13.
  • Wavelength multiplexing/demultiplexing unit 12-m (m is an integer greater than or equal to 1) has a first port, a second port, and a third port.
  • the first port of wavelength multiplexing/demultiplexing unit 12-m (m is an integer greater than or equal to 1) is connected to port 11-m (m is an integer greater than or equal to 1) via optical wiring.
  • the second port of wavelength multiplexing/demultiplexing unit 12-m is connected to control transceiver 13-m (m is an integer greater than or equal to 1) via optical wiring.
  • the third port of wavelength multiplexing/demultiplexing unit 12-m (m is an integer greater than or equal to 1) is connected to the forwarding function via optical wiring.
  • the wavelength multiplexing/demultiplexing unit 12-m separates the multiplexed signal light (for example, multiplexed signal light of upstream control signal light and main signal light) input from port 11-m.
  • the wavelength multiplexing/demultiplexing unit 12-m outputs the separated upstream control signal light toward the control transceiver 13-m.
  • the wavelength multiplexing/demultiplexing unit 12-m outputs the separated main signal light to the subsequent forwarding function. In this way, the wavelength multiplexing/demultiplexing unit 12-m has the function of separating the multiplexed signal light input from the first port and outputting it from the second and third ports.
  • the wavelength multiplexing/demultiplexing unit 12-m wavelength-multiplexes the downstream control signal light output from the control transceiver 13-m with the main signal light output from the forwarding function, and outputs the result via port 11-m toward communication devices 30 and 40.
  • the wavelength multiplexing/demultiplexing unit 12-m has the function of wavelength-multiplexing the optical signal (downstream control signal light) input from the second port and the optical signal (main signal light) input from the third port, and outputting the result from the first port.
  • Wavelength multiplexing/demultiplexing unit 12-m is connected to port 11-m via optical wiring. Therefore, the separation of upstream control signal light and main signal light, and the wavelength multiplexing of downstream control signal light and main signal light, are performed regardless of the type of transmission method (two-core transmission or single-core bidirectional transmission) used by communication devices 30 and 40, which are the source and destination of the optical signals.
  • the wavelength multiplexing/demultiplexing unit 12-m can be, for example, a wavelength filter having wavelength characteristics that reflect the wavelengths of the downstream control signal light and the upstream control signal light, and transmit the wavelength band of the main signal light that can be transmitted by the communication devices 30 and 40.
  • the wavelength characteristics of the wavelength filter may be characteristics that transmit the wavelengths of the downstream control signal light and the upstream control signal light, and reflect the wavelength band of the main signal light that can be transmitted by the communication devices 30 and 40.
  • the control transceiver 13 is a single-core bidirectional transmission type transceiver.
  • a single-core bidirectional transmission type transceiver is a transceiver that can send and receive optical signals via a single optical transmission path L.
  • the control transceiver 13 communicates with a communication device 30 that uses two-core transmission using continuous light. In other words, the control transceiver 13 transmits downstream control signal light using continuous light to a communication device 30 that uses two-core transmission.
  • the control transceiver 13 communicates with the communication device 40, which performs single-core bidirectional transmission, using time division multiplexing. That is, the control transceiver 13 transmits downstream control signal light as burst light to the communication device 30, which performs single-core bidirectional transmission. In this way, the control transceiver 13 communicates with the communication device 40, which performs single-core bidirectional transmission, by adjusting the transmission time so that the timing when the communication device 40 transmits a control signal and the timing when the control transceiver 13 transmits a control signal do not overlap.
  • the control transceiver 13-m includes a wavelength multiplexer/demultiplexer 131, a receiver 132, a transmitter 133, and a timing control unit 134.
  • the wavelength multiplexing/demultiplexing unit 131 has wavelength characteristics that reflect the wavelength of the downstream control signal light sent from the transmitter 133 and transmit the wavelength of the upstream control signal light.
  • the wavelength multiplexing/demultiplexing unit 131 has a first port, a second port, and a third port.
  • the first port of the wavelength multiplexing/demultiplexing unit 131 is connected to the transmitter 133.
  • the second port of the wavelength multiplexing/demultiplexing unit 131 is connected to the wavelength multiplexing/demultiplexing unit 12 via optical wiring.
  • the third port of the wavelength multiplexing/demultiplexing unit 131 is connected to the receiver 132.
  • the wavelength multiplexer/demultiplexer 131 outputs downstream control signal light input to the first port from the second port toward the wavelength multiplexer/demultiplexer 12, and outputs upstream control signal light input to the second port from the third port toward the receiver 132.
  • the wavelength characteristics of the wavelength multiplexer/demultiplexer 131 may be such that it transmits the wavelength of the downstream control signal light and reflects the wavelength of the upstream control signal light.
  • the receiver 132 receives the upstream control signal light. For example, the receiver 132 receives the upstream control signal light output from the third port of the wavelength multiplexing/demultiplexing unit 131. The receiver 132 outputs the received upstream control signal light to the control unit 20.
  • Transmitter 133 transmits downstream control signal light at a specified wavelength. Transmitter 133 transmits downstream control signal light to both communication device 30, which performs two-core transmission, and communication device 40, which performs single-core bidirectional transmission. When transmitter 133 transmits downstream control signal light to communication device 30, which performs two-core transmission, the downstream control signal light is transmitted via a different path than the upstream control signal light transmitted by communication device 30. Therefore, transmitter 133 only needs to transmit downstream control signal light to communication device 30 at the timing when a control signal is received from control unit 20.
  • the control transceiver 13 connected to the communication device 40 performing single-fiber bidirectional transmission determines in advance the timing for transmitting the control signal between the communication device 40. For example, the control transceiver 13 determines a timing that will not collide with the timing at which the communication device 40 transmits the upstream control signal light (a timing different from the timing at which the communication device 40 transmits the upstream control signal light).
  • the transmitter 133 sends downstream control signal light of a specified wavelength to the first port of the wavelength multiplexing/demultiplexing unit 131 at the transmission timing set by the timing control unit 134.
  • the downstream control signal light sent by the transmitter 133 and the upstream control signal light sent by the communication device 40 are sent at different timings.
  • the control signal transmitter 41 sends upstream control signal light at a specified wavelength at a timing when the optical node device 10 is not sending a control signal.
  • the timing control unit 134 adjusts the transmission timing of control signals with the communication device 40. For example, the timing control unit 134 adjusts the transmission timing of each control signal so that the time period in which the control transceiver 13 transmits downstream control signal light does not overlap with the time period in which the communication device 40 transmits upstream control signal light.
  • the timing control unit 134 causes the transmitter 133 to transmit downstream control signal light at the adjusted transmission timing. For example, the timing control unit 134 causes the transmitter 133 to transmit downstream control signal light during the time period in which the optical node device 10 is able to transmit control signals.
  • a communication device connected to the optical node device 10 is a communication device that performs single-core bidirectional transmission or a communication device that performs dual-core transmission can be identified by a report from the communication device connected to the optical node device 10.
  • each control transceiver 13 is connected to a different wavelength multiplexing/demultiplexing unit 12.
  • control transceiver 13-m is connected to wavelength multiplexing/demultiplexing unit 12-m.
  • Control signal light is transmitted bidirectionally over a single core between the control transceiver 13 and the communication device 30. Therefore, it is desirable that the wavelength of the downstream control signal light output by the control transceiver 13 toward the communication device 30 and the wavelength of the upstream control signal light output by the communication device 30 toward the control transceiver 13 be different from each other.
  • each port 11 can be associated with each control transceiver 13 on a one-to-one basis.
  • port 11-m can be associated with control transceiver 13-m.
  • the wavelength of the upstream control signal light output to the control transceiver 13 may be common to the communication device 30 that performs two-core transmission and the communication devices 40-1 and 40-2 that perform single-core bidirectional transmission.
  • the wavelength of the downstream control signal light transmitted by the control transceiver 13 is set to ⁇ 1
  • the wavelength of the upstream control signal light transmitted by the communication device 30 is set to ⁇ 1 .
  • the control unit 20 controls the optical node device 10 and the communication devices 30 and 40.
  • the control of the optical node device 10 includes, for example, control of the transmission of downstream control signal light by the control transceiver 13, and connection settings between ports in the forwarding function (for example, setting of forwarding paths).
  • the control of the communication devices 30 and 40 includes, for example, processes such as authentication and registration with a new connecting device, allocation of emission wavelengths to the communication devices 30 and 40, instructions to stop light and to change wavelengths, etc.
  • the control unit 20 performs the above-mentioned control over the communication devices 30, 40 connected to the optical node device 10 (including, for example, communication devices 30, 40 already connected to the optical node device 10 and newly connected devices). Furthermore, the control unit 20 performs route control and the like in the optical node device 10 so that the communication devices 30, 40 can communicate with the subscriber devices with which they will communicate. Furthermore, the control unit 20 is connected to each control transceiver 13, and causes each control transceiver 13 to transmit downstream control signal light.
  • control unit 20 identifies the port to which the newly connected device is connected based on the upstream control signal light received by the control transceiver 13. As described above, each port 11 and each control transceiver 13 are associated one-to-one. Therefore, the control unit 20 can recognize that the newly connected device is connected to the port 11 associated with the control transceiver 13 that received the upstream control signal light.
  • the control unit 20 also holds port management information related to the ports of the optical node device 10 to which each communication device 30, 40 is connected via the optical transmission path L.
  • the port management information registers information indicating paired ports among the multiple ports 11 provided in the optical node device 10. Therefore, when the control unit 20 identifies a port 11 connected to a new connection device, it can identify other ports 11 that are paired with the identified port 11.
  • two paired ports 11 may also be referred to as a pair of ports 11.
  • the communication device 30 performs two-core transmission and includes a control signal transmitter 31, a control signal receiver 32, a main signal transmitter 33, a main signal receiver 34, a wavelength multiplexing/demultiplexing unit 35, and a wavelength multiplexing/demultiplexing unit 36.
  • the control signal transmitter 31 is a transmitter used to transmit control signals.
  • the control signal transmitter 31 transmits upstream control signal light at a specified wavelength.
  • the control signal receiver 32 is a receiver used to receive control signals.
  • the control signal receiver 32 receives downstream control signal light transmitted from the optical node device 10.
  • the control signal receiver 32 has the function of detecting and demodulating optical signals.
  • the main signal transmitter 33 is a transmitter used to transmit the main signal.
  • the main signal transmitter 33 transmits an optical main signal toward the communication device of the other party.
  • the wavelength of the optical main signal transmitted by the main signal transmitter 33 provided in the communication device 30 may be assigned to the communication device 30 by the control unit 20 and notified by the control unit 20. The wavelength can be notified as a downstream control signal.
  • the main signal receiver 34 is a receiver used to receive the main signal.
  • the main signal receiver 34 receives the optical main signal transmitted from the communication device of the other party.
  • the same wavelength is assigned to the transmission wavelength and the reception wavelength.
  • the wavelength ⁇ 2 is assigned to the communication device 30 performing two-core transmission as the transmission wavelength and the reception wavelength.
  • the wavelength multiplexing/demultiplexing unit 35 is connected to the transmission port of the communication device 30.
  • the transmission port is a port used to transmit optical signals.
  • the wavelength multiplexing/demultiplexing unit 35 wavelength-multiplexes the upstream control signal light sent from the control signal transmitter 31 and the main signal light sent from the main signal transmitter 33, and outputs the multiplexed signal light from the transmission port toward the optical node device 10.
  • the wavelength multiplexing/demultiplexing unit 36 is connected to the receiving port of the communication device 30.
  • the receiving port is a port used to receive optical signals.
  • the wavelength multiplexing/demultiplexing unit 36 separates the multiplexed signal light (e.g., multiplexed signal light of downstream control signal light and main signal light) input from the optical node device 10.
  • the wavelength multiplexing/demultiplexing unit 36 outputs the separated downstream control signal light to the control signal receiver 32, and outputs the separated main signal light to the main signal receiver 34.
  • 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 registered as a pair in the control unit 20 to the transmission port and reception port of the communication device 30.
  • the user may connect either of the pair of optical transmission lines L to the transmission port of the communication device 30.
  • the communication device 40 performs single-core bidirectional transmission and includes a control signal transmitter 41, a control signal receiver 42, a main signal transmitter 43, a main signal receiver 44, a wavelength multiplexing/demultiplexing unit 45, and a timing control unit 46.
  • the control signal transmitter 41 is a transmitter used to transmit control signals.
  • the control signal transmitter 41 transmits upstream control signal light at a specified wavelength at the transmission timing instructed by the timing control unit 46. Since the communication device 40 and the optical node device 10 communicate using time division multiplexing, the control signal transmitter 41 transmits upstream control signal light at a specified wavelength at a timing when the optical node device 10 is not transmitting a control signal.
  • the control signal receiver 42 is a receiver used to receive control signals.
  • the control signal receiver 42 receives downstream control signal light transmitted from the optical node device 10. Because the communication device 40 and the optical node device 10 communicate using time division multiplexing, the control signal receiver 42 receives downstream control signal light at a timing when the control signal transmitter 41 is not transmitting an upstream control signal.
  • the control signal receiver 42 has the function of detecting and demodulating optical signals.
  • wavelength ⁇ 1 is assigned to communication devices 40-1 and 40-2 as the transmission wavelength and reception wavelength of the control signal.
  • Single-fiber bidirectional transmission of control signals is realized by adjusting the transmission times of the upstream control signal and the downstream control signal between a timing control unit 46 provided in communication device 40 that performs single-fiber bidirectional transmission and a timing control unit 134 provided in control transceiver 13.
  • the main signal transmitter 43 is a transmitter used to transmit the main signal.
  • the main signal transmitter 33 transmits a main signal light toward the communication device of the other party.
  • the wavelength of the main signal light transmitted by the main signal transmitter 33 provided in the communication device 30 may be assigned to the communication device 30 by the control unit 20 and notified by the control unit 20.
  • the wavelength notification can be notified as a downstream control signal.
  • the main signal receiver 34 is a receiver used to receive the main signal.
  • the main signal receiver 34 receives the main signal light transmitted from the communication device of the other party.
  • the wavelength of the main signal light emitted by the main signal transmitter 43 provided in the communication devices 40-1 and 40-2 may be assigned to the communication device 40 by the control unit 20 and notified by the control unit 20.
  • the wavelength can be notified as a downstream control signal.
  • the communication devices 40-1 and 40-2 generally need to perform wavelength multiplexing by changing the transmission wavelength and the reception wavelength, or time division multiplexing so that the transmission times of the transmission wavelength and the reception wavelength do not overlap.
  • the following description will be given assuming that the communication device 40-1 is assigned ⁇ 3 as the transmission wavelength of the main signal and that the reception wavelength ⁇ 3 ' of the main signal is assigned.
  • the following description will be given assuming that the communication device 40-2 is assigned ⁇ 4 as the transmission wavelength of the main signal and that the reception wavelength ⁇ 4 ' of the main signal is assigned.
  • single-core bidirectional transmission of the main signal is realized by wavelength multiplexing.
  • the wavelength multiplexing/demultiplexing unit 45 is connected to the transmission/reception port of the communication device 40.
  • the transmission/reception port is a port used for both transmitting and receiving optical signals.
  • the wavelength multiplexing/demultiplexing unit 45 wavelength-multiplexes the upstream control signal light sent from the control signal transmitter 41 and the main signal light sent from the main signal transmitter 43, and outputs the multiplexed signal light from the transmission/reception port toward the optical node device 10.
  • the wavelength multiplexing/demultiplexing unit 45 separates the multiplexed signal light (e.g., multiplexed signal light of downstream control signal light and main signal light) input from the optical node device 10.
  • the wavelength multiplexing/demultiplexing unit 45 outputs the separated downstream control signal light to the control signal receiver 42, and outputs the separated main signal light to the main signal receiver 44.
  • the timing control unit 46 adjusts the timing of control signal transmission between the optical node device 10. For example, the timing control unit 46 adjusts the timing of control signal transmission between the control transceiver 13 and the communication device 40 so that the time period in which the control transceiver 13 transmits downstream control signal light does not overlap with the time period in which the communication device 40 transmits upstream control signal light.
  • the timing control unit 46 causes the control signal transmitter 41 to transmit upstream control signal light at the adjusted transmission timing. For example, the timing control unit 46 causes the control signal transmitter 41 to transmit upstream control signal light during the time period in which the communication device 40 is able to transmit control signals.
  • one of the unused optical transmission paths L is pulled in and connected to the transmission/reception port of the communication device 40.
  • a communication device 30, 40 When a communication device 30, 40 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, 40 may output upstream control signal light to the control unit 20 as an optical signal with a wavelength different from that of the main signal light.
  • the communication device 30, 40 is, for example, an ONU (Optical Network Unit) installed in a subscriber's premises.
  • a communication device 30 using two-core transmission can send an upstream control signal optical signal from a control signal transmitter 31 toward one control transceiver 13 (e.g., control transceiver 13-1), and receive a downstream control signal optical signal sent by another control transceiver 13 (e.g., control transceiver 13-2) at a control signal receiver 32.
  • a communication device 30 using two control transceivers 13 can exchange control signals with the control unit 20.
  • communication devices 40-1 and 40-2 that perform single-core bidirectional transmission can exchange control signals with the control unit 20 by transmitting upstream control signal light and downstream control signal light bidirectionally via single core using time division multiplexing between them and a single control transceiver 13 (e.g., control transceivers 13-4 and 13-5) that has the same functions as the control transceiver 13 used for communication with communication device 30 that performs dual-core transmission.
  • a single control transceiver 13 e.g., control transceivers 13-4 and 13-5 that has the same functions as the control transceiver 13 used for communication with communication device 30 that performs dual-core transmission.
  • the initial connection method in the first embodiment is a method in which a new connection device declares the type of transmission method (single-core bidirectional transmission or two-core transmission) when exchanging control signals for authentication and registration with the control unit 20.
  • Fig. 2 is a diagram for explaining the initial connection method performed by the optical communication system 100 in the first embodiment.
  • FIG. 2 shows a case where a communication device 30 performing two-core transmission and communication devices 40-1 and 40-2 performing single-core bidirectional transmission are newly connected to an optical node device 10.
  • pairs of ports 11 have been registered in advance in the port management information.
  • a communication device 30 using two-core transmission is newly connected to the optical node device 10.
  • the control signal transmitter 31 of the communication device 30 converts an upstream control signal, which includes type information indicating the type of transmission method of the device itself (two-core transmission), into an optical signal and sends it out as an upstream control signal optical signal.
  • the upstream control signal light sent from the communication device 30 is input to port 11-1 of the optical node device 10.
  • the control transceiver 13-1 which is connected to port 11-1 via the wavelength multiplexing/demultiplexing unit 12-1, can receive the upstream control signal light sent from the control signal transmitter 31-1 of the communication device 30.
  • the receiver 132 of the control transceiver 13-1 detects and demodulates the upstream control signal light and outputs the resulting upstream control signal to the control unit 20.
  • the control unit 20 can recognize that the communication device 30 is a communication device that performs two-core transmission based on the type information included in the upstream control signal.
  • the control unit 20 references the port management information and identifies the port 11 that is registered as a pair with the control transceiver 13-1 that received the upstream control signal light and the port 11-1 that is connected via the wavelength multiplexing/demultiplexing unit 12-1.
  • the control unit 20 then causes the control transceiver 13-2, which is connected to the identified port 11-2 via the wavelength multiplexing/demultiplexing unit 12-2, to send a downstream control signal addressed to the communication device 30.
  • This allows the communication device 30 that performs two-core transmission to begin exchanging control signals with the control unit 20 using the two control transceivers 13-1 and 13-2.
  • the control unit 20 can proceed with the authentication and registration process for the communication device 30.
  • the optical node device 10 may stop light emission from the transmitter 133 of the control transceiver 13-1, which is connected to the port 11-1 to which the transmitter of the communication device 30 is connected via the wavelength multiplexing/demultiplexing unit 12-1.
  • communication device 40-1 which performs single-fiber bidirectional transmission
  • optical node device 10 For example, suppose that communication device 40-1 is connected to port 11-4 of the optical node device 10 via optical transmission path L.
  • control signal transmitter 41-1 of communication device 40-1 converts an upstream control signal, which includes type information indicating the type of transmission method of its own device (single-fiber bidirectional transmission), into an optical signal and sends it out as upstream control signal light.
  • the upstream control signal light sent from communication device 40-1 is input to port 11-4 of the optical node device 10.
  • the optical node device 10 is equipped with a control transceiver 13 for single-fiber bidirectional transmission via a wavelength multiplexing/demultiplexing unit 12 for each port 11. Therefore, when a communication device 40-1 performing single-fiber bidirectional transmission is connected, any of the control transceivers 13 provided in the optical node device 10 can receive the upstream control signal light sent by the communication device 40-1, regardless of which port 11 the communication device 40-1 is connected to.
  • the receiver 132 of the control transceiver 13-4 detects and demodulates the upstream control signal light and outputs the obtained upstream control signal to the control unit 20.
  • the control unit 20 can recognize that communication device 40-1 is a communication device performing single-fiber bidirectional transmission based on the type information included in the upstream control signal.
  • the control unit 20 notifies the control transceiver 13-4 to which the communication device 40-1 is connected that it is a communication device that performs single-core bidirectional transmission.
  • the control transceiver 13-4 can determine that the connected communication device is a communication device that performs single-core bidirectional transmission. This allows adjustment of the transmission timing of control signals between the timing control unit 46-1 of the communication device 40-1 and the timing control unit 134 of the control transceiver 13. This enables single-core bidirectional communication of control signals using time division multiplexing.
  • the communication device 40-1 which performs single-core bidirectional transmission, can begin exchanging control signals with the control unit 20 using one control transceiver 13-4.
  • the control transceiver 13-4 is a control transceiver 13 that has the same configuration as the one used for communication with the communication device 30, which performs two-core transmission.
  • the control unit 20 can proceed with the authentication and registration process for the communication device 30.
  • the optical node device 10 may stop light emission from the transmitter 133 of the control transceiver 13-3, which is connected via the wavelength multiplexing/demultiplexing unit 12-3 to port 11-3, which is registered as a pair with port 11-4 to which the transmitter of the communication device 40-1 is connected.
  • the optical node device 10 may cancel the pairing of port 11-3, which is registered in the port management information as a pair with port 11-4 to which the communication device 40-1 is connected. In this case, since the unpaired port 11-3 remains unused, the control unit 20 may use it as the port 11 to connect to a communication device 40 that performs single-fiber bidirectional transmission and that will be newly connected later.
  • the main signal transmitter 43 within the communication device 40 may emit light during the procedures in the above initial connection method.
  • the upstream control signal light is received by one of the control transceivers 13 regardless of the type of transmission method used by the communication device 30 (two-core transmission or single-core bidirectional transmission), and the control unit 20 can recognize the type of the new communication device 30. As a result, the control unit 20 can control the control transceiver 13 so that the new communication device 30 can receive the downstream control signal. This allows the initial connection procedure to proceed.
  • FIG. 3 is a sequence diagram showing the flow of processing of the initial connection method performed by 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 communication device 30 (step S101).
  • the wavelength multiplexing/demultiplexing unit 35 of the communication device 30 is connected to port 11-1 of the optical node device 10 via the optical transmission path L
  • the wavelength multiplexing/demultiplexing unit 36 of the communication device 30 is connected to port 11-2 of the optical node device 10 via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple ports 11 of the optical node device 10 the communication device 30 is connected to. After connecting to the optical node device 10, the communication device 30 generates an upstream control signal that includes type information.
  • the control signal transmitter 31-1 of the communication device 30 converts the generated upstream control signal into an optical signal and sends it out as an upstream control signal optical signal (step S102).
  • the upstream control signal light sent from the control signal transmitter 31-1 of the communication device 30 is input to port 11-1 of the optical node device 10.
  • the upstream control signal light input to port 11-1 is output by the wavelength multiplexing/demultiplexing unit 12-1 toward the control transceiver 13-1.
  • the wavelength multiplexing/demultiplexing unit 131 of the control transceiver 13-1 outputs the upstream control signal light output from the wavelength multiplexing/demultiplexing unit 12-1 to the receiver 132.
  • the receiver 132 detects and demodulates the upstream control signal light.
  • the receiver 132 outputs the demodulated upstream control signal to the control unit 20 via a control line (not shown) (step S103).
  • the control unit 20 determines that a new connection device has been connected to the optical node device 10. Furthermore, the control unit 20 recognizes from the type information included in the upstream control signal that the communication device 30 is a communication device that performs two-core transmission (step S104). The control unit 20 also determines that the new connection device has been connected to port 11-1 associated with the control transceiver 13-1 that includes the receiver 132 that output the upstream control signal.
  • the optical transmission path L used for transmission is different from the optical transmission path L used for reception. Therefore, the transmission port of the communication device 30 is connected to the port 11-1 to which the upstream control signal light is input. Therefore, the control unit 20 can recognize that the identified port 11-1 is connected to the transmission port of the newly connected device.
  • each port 11 is provided with a light detection unit that detects light input to the port 11, and for the control unit 20 to identify the port 11 to which the newly connected device is connected based on the detection results of the light detection unit.
  • the light detection unit that detects the input of light transmits to the control unit 20 port identification information that includes identification information for identifying the light detection unit and information indicating that the input of light has been detected (for example, a light intensity value).
  • the control unit 20 can identify the port 11 to which light has been input based on the identification information of the light detection unit included in the port identification information. It is also possible for the light detection unit to detect the input of light as either upstream control signal light or main signal light.
  • control unit 20 references the port management information and identifies port 11-2, which is registered as a pair with the identified port 11-1.
  • a pair of ports 11 are connected to the transmission port and reception port of the communication device 30 via the optical transmission path L. Therefore, the reception port of the communication device 30 is connected to port 11-2, which is registered as a pair with port 11-1.
  • the control unit 20 then causes the control transceiver 13-2, which is connected to the identified port 11-2 via the wavelength multiplexing/demultiplexing unit 12-2, to transmit a downstream control signal.
  • the control unit 20 exchanges control signal light with the communication device 30, including information necessary for authentication, registration, and optical path opening (step S105).
  • step S106 the user connects to the optical node device 10 by connecting one optical transmission path L to the communication device 40-1.
  • the wavelength multiplexing/demultiplexing unit 45-1 of the communication device 40-1 is connected to port 11-4 of the optical node device 10 via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple ports 11 of the optical node device 10 the communication device 40-1 is connected to. After connecting to the optical node device 10, the communication device 40-1 generates an upstream control signal that includes type information.
  • the control signal transmitter 41-1 of the communication device 40-1 converts the generated upstream control signal into an optical signal and sends it out as an upstream control signal optical signal (step S107).
  • the upstream control signal light sent from the control signal transmitter 41-1 of the communication device 40-1 is input to port 11-4 of the optical node device 10.
  • the upstream control signal light input to port 11-4 is output by the wavelength multiplexing/demultiplexing unit 12-4 toward the control transceiver 13-4.
  • the wavelength multiplexing/demultiplexing unit 131 of the control transceiver 13-4 outputs the upstream control signal light output from the wavelength multiplexing/demultiplexing unit 12-4 to the receiver 132.
  • the receiver 132 detects and demodulates the upstream control signal light.
  • the receiver 132 outputs the demodulated upstream control signal to the control unit 20 via a control line (not shown) (step S108).
  • the control unit 20 determines that a new connection device has been connected to the optical node device 10. Furthermore, the control unit 20 recognizes from the type information included in the upstream control signal that the communication device 40-1 is a communication device that performs single-core bidirectional transmission (step S109). The control unit 20 also determines that the new connection device has been connected to port 11-4, which is associated with the control transceiver 13-4 that includes the receiver 132 that output the upstream control signal.
  • each port 11 is provided with a light detection unit that detects light input to the port 11, and for the control unit 20 to identify the port 11 to which the newly connected device is connected based on the detection results of the light detection unit.
  • the light detection unit that detects the input of light transmits to the control unit 20 port identification information that includes identification information for identifying the light detection unit and information indicating that the input of light has been detected (for example, a light intensity value).
  • the control unit 20 can identify the port 11 to which light has been input based on the identification information of the light detection unit included in the port identification information. It is also possible for the light detection unit to detect the input of light as either upstream control signal light or main signal light.
  • the control unit 20 causes the control transceiver 13-4, which is connected to the identified port 11-4 via the wavelength multiplexing/demultiplexing unit 12-4, to transmit a downstream control signal.
  • the control unit 20 outputs the downstream control signal, including type information, to the control transceiver 13-4 (step S110).
  • the timing control unit 134 of the control transceiver 13-4 determines that the connected communication device is communication device 40, which performs single-core bidirectional transmission.
  • the timing control unit 134 adjusts the transmission time (transmission timing) of the control signal with communication device 40-1 (step S110).
  • the timing control unit 134 causes the transmitter 133 to transmit the downstream control signal output from the control unit 20 during the transmission time period determined by the adjustment.
  • the control unit 20 exchanges control signal light, including information necessary for authentication, registration, and optical path opening, with communication device 40-1 via the optical node device 10 using time division multiplexing (step S111). Note that control signals other than information necessary for optical path opening are also exchanged between the optical node device 10 and communication device 40-1 using time division multiplexing.
  • the optical node device 10 includes multiple ports 11 and one or more control transceivers 13 connected to at least one port 11 via at least one wavelength multiplexing/demultiplexing unit 12, and transmitting and receiving control signal light to and from one or more communication devices 30, 40.
  • Each control transceiver 13 includes a timing control unit 134 that adjusts the transmission timing of control signals with the communication device 40 when the communication device is a communication device 40 that performs single-fiber bidirectional transmission, a transmitter 133 that sends downstream control signal light addressed to the communication device 40 at the transmission timing adjusted by the timing control unit 134 when the communication device is a communication device 40 that performs single-fiber bidirectional transmission, and a wavelength multiplexing/demultiplexing unit 131 that outputs the downstream control signal light sent from the transmitter 133 to the connected wavelength multiplexing/demultiplexing unit 12.
  • the optical node device 10 is equipped with a control transceiver 13 for single-fiber bidirectional transmission associated with each port. This allows the upstream control signal to be transferred to the control unit 20, regardless of whether the upstream control signal light is transmitted from a communication device 30 performing two-fiber transmission or a communication device 30 performing single-fiber bidirectional transmission. Furthermore, when a communication device 40 performing single-fiber bidirectional transmission is connected, the optical node device 10 adjusts the transmission timing of the control signal to prevent the upstream control signal light and the downstream control signal light from being transmitted at the same time. This allows the optical node device 10 to avoid collisions between the upstream and downstream control signals. Therefore, control signals can be exchanged with the control unit 20 regardless of the type of transmission method (single-fiber bidirectional transmission or two-fiber transmission) of the connected communication devices 30, 40.
  • the optical node device 10 does not need to manage its ports 11 separately as ports for connecting to communication devices 30 that perform two-core transmission and ports for connecting to communication devices 30 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 30.
  • the control unit 20 cancels the pairing of the other port 11 that is paired with the port 11 connected to the communication device 30 that performs single-fiber bidirectional transmission. Then, by making the other unused port 11 connectable to another new communication device that performs single-fiber bidirectional transmission, the ports of the optical node device 10 can be used efficiently in a configuration that accommodates a mixture of ports for connection to communication devices 30 that perform two-fiber transmission and communication devices that perform single-fiber bidirectional transmission. This improves convenience.
  • the optical node processor has a configuration in which a control transceiver is provided for each port.
  • a configuration in which a control transceiver is provided for each pair of ports will be described.
  • FIG. 4 is a diagram showing an example configuration of an optical communication system 100a in the second embodiment.
  • the optical communication system 100a includes an optical node device 10a and a control unit 20.
  • One or more communication devices 30, 40 are connected to the optical node device 10a via an optical transmission path L.
  • three communication devices 30, 40 are connected to the optical node device 10a via the optical transmission path L, but the number of communication devices 30, 40 may be one or more.
  • the communication device 30 is a device that performs two-core transmission
  • the communication devices 40-1, 40-2 are devices that perform single-core bidirectional transmission.
  • the optical node device 10a is a node device that constitutes a wavelength network and accommodates one or more communication devices 30, 40.
  • the optical node device 10a has multiple ports 11, multiple wavelength multiplexing/demultiplexing units 12, and multiple control transceivers 13a.
  • Figure 4 only shows the configuration for the optical node device 10a to send and receive control signal light between the control unit 20 and the communication devices 30, 40.
  • the optical node device 10a also has a forwarding function for forwarding optical signals to other optical node devices or communication devices.
  • the optical node device 10a differs in configuration from the optical node device 10 in that it has a control transceiver 13a instead of the control transceiver 13.
  • the rest of the configuration of the optical node device 10a is the same as that of the optical node device 10. The following explanation will focus on the differences from the optical node device 10a.
  • a wavelength multiplexer/demultiplexer 12 is installed for each port 11 and is connected to a control transceiver 13a for that pair of ports.
  • the wavelength multiplexer/demultiplexer 12 performs the same processing as in the first embodiment, except that it is connected to a control transceiver 13a for that pair of ports.
  • a control transceiver 13a for a pair of ports is a transceiver capable of transmitting and receiving optical signals at each of the two ports 11. Therefore, one control transceiver 13a is connected to two wavelength multiplexing/demultiplexing units 12 connected to one pair of ports 11. For example, if the pair of ports 11 are port 11-1 and port 11-2, the control transceiver 13a-1 is connected to the wavelength multiplexing/demultiplexing unit 12-1 connected to port 11-1 and the wavelength multiplexing/demultiplexing unit 12-2 connected to port 11-2.
  • control transceiver 13a is connected to a pair of ports 11 via different wavelength multiplexing/demultiplexing units 12, it can be associated with the pair of ports 11 as being connected to the control transceiver 13a.
  • the control transceiver 13a comprises a wavelength multiplexer/demultiplexer 131, a receiver 132, a transmitter 133, a timing control unit 134, a wavelength multiplexer/demultiplexer 135, a receiver 136, a transmitter 137, and a timing control unit 138.
  • the wavelength multiplexer/demultiplexer 131, the receiver 132, the transmitter 133, and the timing control unit 134 are used to transmit and receive optical signals at one port 11.
  • the wavelength multiplexer/demultiplexer 135, the receiver 136, the transmitter 137, and the timing control unit 138 are used to transmit and receive optical signals at the other port 11 that is paired with it.
  • the timing control unit 134 controls the transmission timing of the downstream control signal light from the transmitter 133.
  • the timing control unit 138 controls the transmission timing of the downstream control signal light from the transmitter 137.
  • the wavelength multiplexing/demultiplexing unit 131, receiver 132, transmitter 133, and timing control unit 134 are used to send and receive optical signals at port 11-1.
  • the wavelength multiplexing/demultiplexing unit 135, receiver 136, transmitter 137, and timing control unit 138 are used to send and receive optical signals at port 11-2.
  • control transceiver 13a has two combinations of wavelength multiplexing/demultiplexing units, transmitters, receivers, and timing control units.
  • the control unit 20 may store information indicating which port 11 each combination of wavelength multiplexing/demultiplexing units, transmitters, receivers, and timing control units provided in the control transceiver 13a corresponds to.
  • the control unit 20 may store information such as the combination of wavelength multiplexing/demultiplexing unit 131, receiver 132, transmitter 133, and timing control unit 134 corresponds to port 11-1, and the combination of wavelength multiplexing/demultiplexing unit 135, receiver 136, transmitter 137, and timing control unit 138 corresponds to port 11-2.
  • control unit 20 only needs to store information indicating which combination corresponds to which port 11.
  • the initial connection method in the optical communication system 100a in the second embodiment is the same as in the first embodiment, except for the difference in the configuration of the control transceiver 13a.
  • An example is shown below.
  • control unit 20 cannot determine which of the multiple ports 11 of the optical node device 10a the communication device 30 is connected to. After connecting to the optical node device 10a, the communication device 30 generates an upstream control signal that includes type information.
  • the control signal transmitter 31 of the communication device 30 converts the generated upstream control signal into an optical signal and sends it out as an upstream control signal optical signal.
  • the upstream control signal light sent from the control signal transmitter 31 of the communication device 30 is input to port 11-1 of the optical node device 10a.
  • the upstream control signal light input to port 11-1 is output by the wavelength multiplexing/demultiplexing unit 12-1 toward the control transceiver 13a-1.
  • the wavelength multiplexing/demultiplexing unit 131 of the control transceiver 13a-1 outputs the upstream control signal light output from the wavelength multiplexing/demultiplexing unit 12-1 to the receiver 132.
  • the receiver 132 detects and demodulates the upstream control signal light.
  • the receiver 132 outputs the demodulated upstream control signal to the control unit 20 via a control line (not shown).
  • the control unit 20 determines that a new connection device has been connected to the optical node device 10a. Furthermore, the control unit 20 recognizes from the type information included in the upstream control signal that the communication device 30 is a communication device that performs two-core transmission. The control unit 20 also determines that the new connection device has been connected to the port 11-1 associated with the control transceiver 13a-1 that includes the receiver 132 that output the upstream control signal.
  • the optical transmission path L used for transmission is different from the optical transmission path L used for reception. Therefore, the transmission port of the communication device 30 is connected to the port 11-1 to which the upstream control signal light is input. Therefore, the control unit 20 can recognize that the identified port 11-1 is connected to the transmission port of the newly connected device.
  • each port 11 is provided with a light detection unit that detects light input to the port 11, and for the control unit 20 to identify the port 11 to which the newly connected device is connected based on the detection results of the light detection unit.
  • the light detection unit that detects the input of light transmits to the control unit 20 port identification information that includes identification information for identifying the light detection unit and information indicating that the input of light has been detected (for example, a light intensity value).
  • the control unit 20 can identify the port 11 to which light has been input based on the identification information of the light detection unit included in the port identification information. It is also possible for the light detection unit to detect the input of light as either upstream control signal light or main signal light.
  • the control unit 20 references the port management information and identifies port 11-2, which is registered as a pair with the identified port 11-1.
  • a pair of ports 11 are connected to the transmission port and reception port of the communication device 30 via the optical transmission path L. Therefore, the reception port of the communication device 30 is connected to port 11-2, which is registered as a pair with port 11-1.
  • the control unit 20 then causes the transmitter 137 of the control transceiver 13a-1, which corresponds to the identified port 11-2, to transmit a downstream control signal light.
  • information regarding which port 11 corresponds to which transmitter of the control transceiver 13a may be stored in advance.
  • the control unit 20 exchanges control signal light with the communication device 30, including information necessary for authentication, registration, and optical path opening.
  • the wavelength multiplexing/demultiplexing unit 45-1 of the communication device 40-1 is connected to port 11-4 of the optical node device 10a via the optical transmission path L.
  • control unit 20 cannot determine which of the multiple ports 11 of the optical node device 10a the communication device 40-1 is connected to. After connecting to the optical node device 10a, the communication device 40-1 generates an upstream control signal that includes type information.
  • the control signal transmitter 41-1 of the communication device 40-1 converts the generated upstream control signal into an optical signal and sends it out as an upstream control signal optical signal.
  • the upstream control signal light sent from the control signal transmitter 41-1 of the communication device 40-1 is input to port 11-4 of the optical node device 10a.
  • the upstream control signal light input to port 11-4 is output by the wavelength multiplexing/demultiplexing unit 12-4 toward the control transceiver 13a-2.
  • the wavelength multiplexing/demultiplexing unit 135 of the control transceiver 13a-2 outputs the upstream control signal light output from the wavelength multiplexing/demultiplexing unit 12-4 to the receiver 136.
  • the receiver 136 detects and demodulates the upstream control signal light.
  • the receiver 136 outputs the demodulated upstream control signal to the control unit 20 via a control line (not shown).
  • the control unit 20 determines that a new connection device has been connected to the optical node device 10a. Furthermore, the control unit 20 recognizes from the type information included in the upstream control signal that the communication device 40-1 is a communication device that performs single-core bidirectional transmission. The control unit 20 also determines that the new connection device has been connected to port 11-4, which is associated with the control transceiver 13a-2 that includes the receiver 136 that output the upstream control signal.
  • each port 11 is provided with a light detection unit that detects light input to the port 11, and for the control unit 20 to identify the port 11 to which the newly connected device is connected based on the detection results of the light detection unit.
  • the light detection unit that detects the input of light transmits to the control unit 20 port identification information that includes identification information for identifying the light detection unit and information indicating that the input of light has been detected (for example, a light intensity value).
  • the control unit 20 can identify the port 11 to which light has been input based on the identification information of the light detection unit included in the port identification information. It is also possible for the light detection unit to detect the input of light as either upstream control signal light or main signal light.
  • the control unit 20 causes the control transceiver 13a-2, which is connected to the identified port 11-4 via the wavelength multiplexing/demultiplexing unit 12-4, to transmit a downstream control signal.
  • the control unit 20 outputs a downstream control signal including type information to the control transceiver 13a-2.
  • the timing control unit 138 of the control transceiver 13a-2 determines that the connected communication device is communication device 40, which performs single-core bidirectional transmission, based on the type information included in the downstream control signal output from the control unit 20.
  • the timing control unit 138 adjusts the transmission time (transmission timing) of the control signal with communication device 40-1.
  • the timing control unit 138 causes the transmitter 137 to transmit the downstream control signal output from the control unit 20 during the transmission time period determined by the adjustment.
  • the control unit 20 exchanges control signal light, including information necessary for authentication, registration, and optical path opening, with communication device 40-1 via the optical node device 10a using time division multiplexing. Note that control signals other than information necessary for optical path opening are also exchanged between the optical node device 10a and communication device 40-1 using time division multiplexing.
  • the optical communication system 100a configured as described above can achieve the same effects as the first embodiment.
  • the optical node device 10a is provided with one control transceiver 13a, which has two pairs of transceivers capable of single-core bidirectional transmission, for each pair of ports 11. This eliminates the need to provide an individual control transceiver for each port 11, as in the first embodiment.
  • control unit 20 in the above-described embodiment 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 to implement the function.
  • 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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  • Optical Communication System (AREA)

Abstract

La présente invention concerne un dispositif de nœud optique qui comprend : une pluralité de ports auxquels se connectent un ou plusieurs dispositifs de communication; et un ou plusieurs émetteurs-récepteurs qui sont connectés à au moins un port par l'intermédiaire d'au moins une première unité de multiplexage/démultiplexage de longueur d'onde pour multiplexer ou démultiplexer des signaux optiques entrés, et qui transmettent une lumière de signal de commande vers le ou les dispositifs de communication et la reçoivent depuis celui-ci ou ceux-ci. Le ou les émetteurs-récepteurs comprennent : une ou plusieurs unités de commande de synchronisation qui, lorsque le ou les dispositifs de communication sont des dispositifs de communication qui réalisent une transmission bidirectionnelle à cœur unique, ajustent la synchronisation de transmission de signal de commande au ou aux dispositifs de communication; un ou plusieurs émetteurs qui, lorsque le ou les dispositifs de communication sont des dispositifs de communication qui réalisent une transmission bidirectionnelle à cœur unique, transmettent une lumière de signal de commande de liaison descendante adressée au ou aux dispositifs de communication avec la synchronisation de transmission ajustée par la ou les unités de commande de synchronisation; et une ou plusieurs secondes ondes de multiplexage/démultiplexage de longueur d'onde qui émettent une lumière de signal de commande de liaison descendante transmise du ou des émetteurs à la ou aux premières unités de multiplexage/démultiplexage de longueur d'onde qui est ou sont connectées.　
PCT/JP2024/023794 2024-07-01 2024-07-01 Dispositif de nœud optique, émetteur-récepteur et procédé de connexion Pending WO2026009286A1 (fr)

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PCT/JP2024/023794 WO2026009286A1 (fr) 2024-07-01 2024-07-01 Dispositif de nœud optique, émetteur-récepteur et procédé de connexion

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PCT/JP2024/023794 WO2026009286A1 (fr) 2024-07-01 2024-07-01 Dispositif de nœud optique, émetteur-récepteur et procédé de connexion

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6281135A (ja) * 1985-10-03 1987-04-14 Mitsubishi Electric Corp 光信号伝送装置
JP2005167478A (ja) * 2003-12-01 2005-06-23 Ntt Electornics Corp 光伝送システム及び光伝送ユニット
WO2022091394A1 (fr) * 2020-10-30 2022-05-05 日本電信電話株式会社 Dispositif de communication optique, système de communication optique et procédé de communication optique
WO2023199399A1 (fr) * 2022-04-12 2023-10-19 日本電信電話株式会社 Dispositif de commande de communication et procédé de commande de communication
WO2024069807A1 (fr) * 2022-09-28 2024-04-04 日本電信電話株式会社 Dispositif de communication optique et procédé d'ouverture de trajet de communication optique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6281135A (ja) * 1985-10-03 1987-04-14 Mitsubishi Electric Corp 光信号伝送装置
JP2005167478A (ja) * 2003-12-01 2005-06-23 Ntt Electornics Corp 光伝送システム及び光伝送ユニット
WO2022091394A1 (fr) * 2020-10-30 2022-05-05 日本電信電話株式会社 Dispositif de communication optique, système de communication optique et procédé de communication optique
WO2023199399A1 (fr) * 2022-04-12 2023-10-19 日本電信電話株式会社 Dispositif de commande de communication et procédé de commande de communication
WO2024069807A1 (fr) * 2022-09-28 2024-04-04 日本電信電話株式会社 Dispositif de communication optique et procédé d'ouverture de trajet de communication optique

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