WO2024183451A1 - 接入方法、pon系统、第一onu和olt - Google Patents

接入方法、pon系统、第一onu和olt Download PDF

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Publication number
WO2024183451A1
WO2024183451A1 PCT/CN2024/071289 CN2024071289W WO2024183451A1 WO 2024183451 A1 WO2024183451 A1 WO 2024183451A1 CN 2024071289 W CN2024071289 W CN 2024071289W WO 2024183451 A1 WO2024183451 A1 WO 2024183451A1
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WO
WIPO (PCT)
Prior art keywords
olt
onu
wavelength
supported
upstream
Prior art date
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Ceased
Application number
PCT/CN2024/071289
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English (en)
French (fr)
Inventor
吴徐明
郑刚
刘德坤
黄荣芳
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP24766174.7A priority Critical patent/EP4642048A4/en
Publication of WO2024183451A1 publication Critical patent/WO2024183451A1/zh
Priority to CONC2025/0010971A priority patent/CO2025010971A2/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0075—Wavelength grouping or hierarchical aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1301—Optical transmission, optical switches

Definitions

  • the present application relates to the field of optical communications, and in particular to an access method, a passive optical network (PON) system, a first optical network unit (ONU) and an optical line terminal (OLT).
  • PON passive optical network
  • ONU first optical network unit
  • OLT optical line terminal
  • the PON system includes an OLT, an optical distribution network (ODN), and multiple ONUs.
  • the PON system can allow the reception of multiple different wavelengths through wavelength division multiplexing.
  • a wavelength division multiplexing (WDM) device can be provided in the OLT.
  • WDM wavelength division multiplexing
  • multiple ONUs are used to output multiple upstream optical signals of different wavelengths.
  • the ODN is used to combine multiple upstream optical signals and transmit the combined upstream optical signals to the OLT.
  • the OLT is used to demultiplex the combined upstream optical signals through the WDM device to obtain multiple upstream optical signals.
  • the OLT processes the multiple upstream optical signals separately.
  • the OLT cannot normally receive the upstream optical signal, thereby reducing the reliability of optical communication.
  • the present application provides an access method, a PON system, a first ONU and an OLT.
  • a PON system By broadcasting the upstream wavelength information supported by the current OLT port in the downstream direction, it is possible to avoid ONUs using upstream wavelengths not supported by the current OLT port from accessing the PON system, thereby improving the reliability of optical communication.
  • the first aspect of the present application provides an access method.
  • the access method comprises the following steps: a first ONU receives broadcast information from an OLT.
  • the OLT is connected to a plurality of ONUs via an ODN.
  • the plurality of ONUs include the first ONU.
  • the broadcast information includes information about upstream wavelengths supported by the OLT.
  • the upstream wavelengths supported by the OLT do not include the upstream wavelength of the first ONU, the first ONU does not start registration.
  • the upstream wavelengths supported by the OLT include the upstream wavelength of the first ONU, the first ONU starts registration.
  • the plurality of ONUs further include a second ONU.
  • the second ONU Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelength supported by the OLT does not include the first wavelength.
  • the OLT includes a first OLT and a second OLT.
  • the plurality of ONUs also include a second ONU.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelength supported by the OLT does not include the first wavelength.
  • the first wavelength is 1260-1280 nanometers, 1290-1310 nanometers, or 1284-1288 nanometers.
  • the number of bits of the upstream wavelength information supported by the OLT is equal to the number of wavelengths indicated by the upstream wavelength information.
  • the size of the broadcast information can be reduced, thereby saving transmission resources.
  • the upstream wavelength information supported by the OLT includes a first bit, a second bit, and a third bit.
  • the first bit is used to indicate whether the OLT supports an upstream wavelength of 1260 to 1280 nanometers.
  • the second bit is used to indicate whether the OLT supports an upstream wavelength of 1290 to 1310 nanometers.
  • the third bit is used to indicate whether the OLT supports an upstream wavelength of 1284 to 1288 nanometers.
  • the upstream wavelength information supported by the OLT includes a first bit, a second bit, a third bit, and a fourth bit.
  • the first bit is used to indicate whether the OLT supports an upstream wavelength of 1260 to 1280 nanometers.
  • the second bit is used to indicate whether the OLT supports an upstream wavelength of 1290 to 1310 nanometers.
  • the third bit is used to indicate whether the OLT supports an upstream wavelength of 1284 to 1288 nanometers.
  • the fourth bit is used to indicate whether the OLT supports an upstream wavelength of 1298 to 1302 nanometers.
  • the broadcast information is a downlink physical frame.
  • the uplink wavelength information supported by the OLT is located in the downlink physical frame.
  • the broadcast information is a physical layer operations administration and maintenance (PLOAM) message.
  • PLOAM physical layer operations administration and maintenance
  • the upstream wavelength information supported by the OLT is located in a message content field in the PLOAM message.
  • the PLOAM message is a burst configuration message.
  • the upstream wavelength information supported by the OLT is located in the downstream PON identification field in the message content field.
  • the broadcast information is a downlink frame start signal (FS) frame.
  • the allocation identifier in the downlink FS frame is used to indicate the uplink wavelength information supported by the OLT.
  • a second aspect of the present application provides an access method.
  • the access method comprises the following steps: an OLT transmits broadcast information to a first ONU.
  • the OLT is connected to a plurality of ONUs via an ODN.
  • the plurality of ONUs include the first ONU.
  • the broadcast information includes upstream wavelength information supported by the OLT.
  • the upstream wavelength supported by the OLT does not include the upstream wavelength of the first ONU, the upstream wavelength information supported by the OLT is used for the first ONU not to start registration.
  • the upstream wavelength supported by the OLT includes the upstream wavelength of the first ONU, the upstream wavelength information supported by the OLT is used for the first ONU to start registration.
  • the plurality of ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT. The upstream wavelength for communication between the second ONU and the OLT is the first wavelength. The upstream wavelength supported by the OLT does not include the first wavelength.
  • the OLT includes the first OLT and the second OLT.
  • the plurality of ONUs further include the second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT. The upstream wavelength for communication between the second ONU and the OLT is the first wavelength. The upstream wavelength supported by the OLT does not include the first wavelength.
  • a third aspect of the present application provides a PON system.
  • the PON system includes an OLT, an ODN, and a plurality of ONUs.
  • the OLT is connected to the plurality of ONUs via the ODN.
  • the plurality of ONUs include a first ONU.
  • the OLT is used to transmit broadcast information to the first ONU.
  • the broadcast information includes information about upstream wavelengths supported by the OLT. When the upstream wavelengths supported by the OLT do not include the upstream wavelength of the first ONU, the first ONU does not start registration. When the upstream wavelengths supported by the OLT include the upstream wavelength of the first ONU, the first ONU starts registration.
  • the plurality of ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT. The upstream wavelength for communication between the second ONU and the OLT is the first wavelength. The upstream wavelength supported by the OLT does not include the first wavelength.
  • the OLT includes the first OLT and the second OLT.
  • the plurality of ONUs further include the second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT. The upstream wavelength for communication between the second ONU and the OLT is the first wavelength. The upstream wavelength supported by the OLT does not include the first wavelength.
  • a first ONU in a fourth aspect of the present application, includes a receiver and a processor.
  • the receiver is used to receive broadcast information from an OLT.
  • the OLT is connected to a plurality of ONUs via an ODN.
  • the plurality of ONUs includes the first ONU.
  • the upstream wavelength supported by the OLT does not include the upstream wavelength of the first ONU, and the processor is used to not start registration according to the upstream wavelength information supported by the OLT.
  • the upstream wavelength supported by the OLT includes the upstream wavelength of the first ONU, and the processor is used to start registration according to the upstream wavelength information supported by the OLT.
  • the plurality of ONUs further include a second ONU.
  • the second ONU Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelengths supported by the OLT do not include the first wavelength.
  • the first ONU further includes a transmitter. After the processor starts registration according to the upstream wavelength information supported by the OLT, the transmitter is used to send an upstream optical signal to the OLT. The wavelength of the upstream optical signal is within the upstream wavelength range supported by the OLT.
  • the present application provides an OLT.
  • the OLT includes a processor and a transmitter.
  • the processor is used to generate broadcast information.
  • the transmitter is used to transmit the broadcast information to a first ONU.
  • the OLT is connected to multiple ONUs through an ODN.
  • the multiple ONUs include the first ONU.
  • the broadcast information includes upstream wavelength information supported by the OLT.
  • the upstream wavelength supported by the OLT does not include the upstream wavelength of the first ONU
  • the upstream wavelength information supported by the OLT is used for the first ONU to not start registration.
  • the upstream wavelength supported by the OLT includes the upstream wavelength of the first ONU
  • the upstream wavelength information supported by the OLT is used for the first ONU to start registration.
  • the plurality of ONUs further include a second ONU.
  • the second ONU Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelengths supported by the OLT do not include the first wavelength.
  • the OLT further includes a receiver.
  • the receiver is configured to receive an upstream optical signal from the first ONU.
  • the wavelength of the upstream optical signal is within an upstream wavelength range supported by the OLT.
  • the description of the optional manner in the second aspect, the third aspect, the fourth aspect or the fifth aspect is different from the description of the optional manner in the first aspect.
  • the description of the optional method in the second aspect, the third aspect, the fourth aspect or the fifth aspect can refer to the description of the optional method in the first aspect.
  • the number of bits of the upstream wavelength information supported by the OLT is equal to the number of wavelengths indicated by the upstream wavelength information.
  • the broadcast information is a downstream physical frame.
  • the upstream wavelength information supported by the OLT is located in the passive optical network identification field of the downstream physical frame.
  • the sixth aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on a computer, the computer executes the method as described in the first aspect or any one of the embodiments of the first aspect; or the computer executes the method as described in the second aspect or any one of the embodiments of the second aspect.
  • the seventh aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method as described in the first aspect or any one of the embodiments of the first aspect; or enables the computer to execute the method as described in the second aspect or any one of the embodiments of the second aspect.
  • FIG1 is a first structural diagram of a PON system provided in an embodiment of the present application.
  • FIG2 is a second structural diagram of a PON system provided in an embodiment of the present application.
  • FIG3 is a third structural diagram of a PON system provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of the structure of a downlink FS frame provided in an embodiment of the present application.
  • FIG5 is a schematic diagram of the structure of a downlink physical frame provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of the structure of a PLOAM message provided in an embodiment of the present application.
  • FIG7 is a first flow chart of an access method provided in an embodiment of the present application.
  • FIG8 is a second flow chart of the access method provided in an embodiment of the present application.
  • FIG9 is a schematic diagram of the structure of a first ONU provided in an embodiment of the present application.
  • FIG. 10 is a schematic diagram of the structure of an OLT provided in an embodiment of the present application.
  • the present application provides an access method, a passive optical network (PON) system, a first optical network unit (ONU) and an optical line terminal (OLT).
  • PON passive optical network
  • ONU first optical network unit
  • OLT optical line terminal
  • the OLT can allow reception of multiple different wavelengths through wavelength division multiplexing.
  • multiple ONUs are used to output multiple upstream optical signals of different wavelengths.
  • the ODN is used to combine multiple upstream optical signals and transmit the combined upstream optical signals to the OLT.
  • the OLT is used to demultiplex the combined upstream optical signals through a wavelength division multiplexing (WDM) device to obtain multiple upstream optical signals.
  • WDM wavelength division multiplexing
  • FIG. 1 is a first structural schematic diagram of the PON system provided in an embodiment of the present application.
  • the PON system 100 includes an OLT 101, an ODN 102, and a plurality of ONUs.
  • the plurality of ONUs include ONUs 103 to 105.
  • the OLT 101 is connected to the plurality of ONUs via the ODN 102.
  • the ODN 102 includes a splitter/combiner.
  • the OLT 101 distributes the downstream optical signal to all ONUs via the splitter.
  • the upstream optical signal from each optical terminal is coupled to the OLT 101 via the combiner.
  • the OLT 101 is used to transmit broadcast information to the first ONU.
  • the first ONU is an ONU that has not yet been connected to the OLT 101.
  • the first ONU can be any one of the ONUs 103 to 105.
  • the broadcast information includes the upstream wavelength information supported by the OLT 101.
  • the wavelength of the transmitter of the first ONU is an upstream wavelength not supported by the OLT 101
  • the first ONU is used to not start registration according to the upstream wavelength information supported by the OLT 101.
  • the upstream wavelengths supported by the OLT 101 are wavelength 1 and wavelength 2
  • the upstream wavelength not supported by the OLT 101 is wavelength 3.
  • the wavelength of the transmitter of the first ONU is wavelength 3.
  • the first ONU When the wavelength of the transmitter of the first ONU is an upstream wavelength supported by the OLT 101, the first ONU is used to start registration according to the upstream wavelength information supported by the OLT 101. Initiating registration may refer to starting the transmitter of the first ONU or responding to the registration authorization of the OLT 101.
  • the first ONU only after the registration is started, the first ONU has the ability to transmit the upstream optical signal to the OLT 101.
  • the upstream wavelength supported by the OLT 101 does not include the wavelength of the transmitter of the first ONU, the first ONU will not start the registration, that is, it will not transmit the upstream optical signal to the OLT 101. Therefore, the embodiment of the present application can improve the reliability of optical communication.
  • the first ONU can The transmitter sends an upstream optical signal to the OLT 101.
  • the wavelength of the upstream optical signal is within the upstream wavelength range supported by the OLT 101.
  • the wavelength of the transmitter of the first ONU is the upstream wavelength supported by the OLT 101
  • the first ONU may not start registration.
  • the upstream wavelength used by the OLT 101 depends on the hardware configuration of the OLT 101. For example, if the OLT 101 is designed with an optical module that can process wavelength 1 and wavelength 2 respectively, the upstream wavelengths used by the OLT 101 include wavelength 1 and wavelength 2.
  • the upstream wavelengths not used by the OLT 101 are wavelengths other than wavelength 1 and wavelength 2.
  • the upstream wavelengths supported by the OLT 101 are referred to as wavelengths supported by the OLT 101.
  • the upstream wavelengths not supported by the OLT 101 are referred to as wavelengths not supported by the OLT 101.
  • the wavelengths not supported by the OLT 101 may be upstream wavelengths not used by the OLT 101 or upstream wavelengths used by the OLT 101.
  • the upstream wavelength of the first ONU conflicts with the upstream wavelength of the second ONU in the PON system 100.
  • the upstream wavelength of the second ONU is 1290 to 1310 nanometers.
  • the upstream wavelength of the first ONU is 1290-1310 nanometers.
  • the upstream wavelength of the second ONU is 1290-1310 nanometers.
  • the upstream wavelength of the first ONU is 1298-1302 nanometers.
  • the second ONU is an ONU that has been connected to OLT 101, that is, the second ONU can transmit an upstream optical signal to OLT 101 through ODN 102.
  • the communication wavelength between the second ONU and OLT 101 is the first wavelength. Therefore, the first wavelength is the upstream wavelength used by OLT 101.
  • the second ONU may be ONU 104 and/or ONU 105 in FIG. 1 .
  • the first ONU may access OLT 101.
  • the second ONU and the first ONU may access the same OLT through ODN 102, or may access different OLTs. These are described below.
  • FIG2 is a second structural diagram of the PON system provided in an embodiment of the present application.
  • the PON system includes an OLT 101, an ODN 102, a first ONU, and a second ONU.
  • the OLT 101 includes a WDM 201, an optical module 202, and an optical module 203.
  • the optical module 202 is used to process an upstream optical signal of wavelength 1.
  • the optical module 203 is used to process an upstream optical signal of wavelength 2.
  • the wavelengths used by the OLT 101 include wavelength 1 and wavelength 2.
  • the OLT 101 is connected to the first ONU and the second ONU through the ODN 102.
  • the communication wavelength between the second ONU and the OLT 101 is the first wavelength.
  • the first wavelength is also called wavelength 1.
  • the upstream optical signal transmitted by the second ONU enters the optical module 202 after passing through the ODN 102 and the WDM 201.
  • the optical module 202 is used to process the upstream optical signal transmitted by the second ONU.
  • the wavelength of the first ONU is wavelength 2.
  • the uplink optical signal of the first ONU will enter the optical module 203 after passing through the ODN 102 and the WDM 201.
  • the optical module 203 is used to process the uplink optical signal of the first ONU.
  • the second ONU and the first ONU are connected to the same OLT through the ODN 102.
  • FIG3 is a third structural diagram of a PON system provided in an embodiment of the present application.
  • the PON system includes an OLT 101, a WDM 201, an ODN 102, a first ONU, and a second ONU.
  • the OLT 101 includes a first OLT 301 and a second OLT 302.
  • the OLT 101 is connected to two ONUs through the WDM 201 and the ODN 102.
  • the first OLT 301 is used to process an upstream optical signal of wavelength 1.
  • the second OLT 302 is used to process an upstream optical signal of wavelength 2.
  • the wavelengths used by the OLT 101 include wavelength 1 and wavelength 2.
  • the wavelength of the second ONU is wavelength 1.
  • the upstream optical signal transmitted by the second ONU enters the first OLT 301 after passing through the ODN 102 and the WDM 201.
  • the first OLT 301 is used to process the upstream optical signal transmitted by the second ONU.
  • the wavelength of the first ONU is wavelength 2.
  • the uplink optical signal of the first ONU will enter the second OLT 302 after passing through ODN 102 and WDM 201.
  • the second OLT 302 is used to process the uplink optical signal of the first ONU.
  • the second ONU and the first ONU are connected to different OLTs through ODN 102.
  • the wavelength used by OLT 101 may be 3 wavelengths or 4 wavelengths.
  • the 3 wavelengths are 1260-1280 nanometers, 1284-1288 nanometers, and 1290-1310 nanometers.
  • the 4 wavelengths are 1260-1280 nanometers, 1284-1288 nanometers, 1290-1310 nanometers, and 1298-1302 nanometers.
  • 1260-1280 nanometers, 1284-1288 nanometers, 1290-1310 nanometers, and 1298-1302 nanometers represent one wavelength respectively.
  • the central wavelength of 1260-1280 nanometers is 1270 nanometers.
  • the central wavelength of 1284-1288 nanometers is 1286 nanometers.
  • the central wavelength of 1290-1310 nanometers is 1300 nanometers.
  • the central wavelength of 1298-1302 nanometers is 1300 nanometers.
  • the first wavelength may be any one of the three wavelengths or the four wavelengths.
  • the PON system 100 may be a 50G-PON (50-gigabit-capable passive optical network, 50G-GPON) system.
  • the upstream wavelength used by the OLT 101 may be the aforementioned three wavelengths or four wavelengths.
  • the PON system 100 may also be a combination of a 50G-PON system and a GPON (gigabit PON) system.
  • the wavelengths not supported by the OLT 101 are 1290 to 1310 nanometers and 1298 to 1302 nanometers.
  • the wavelengths supported by the OLT 101 may be the wavelengths other than 1290 to 1310 nanometers and 1298 to 1302 nanometers among the aforementioned three wavelengths or four wavelengths.
  • the PON system 100 may also be a combination of a 50G-PON system and an XG-PON (10-gigabit-capable passive optical network, 10G-GPON) system.
  • the wavelength not supported by the OLT 101 may be 1260 to 1280 nanometers.
  • the wavelength supported by OLT 101 may be any of the three or four wavelengths except 1260 to 1280 nanometers.
  • PON system 100 may also be a combination of a 50G-PON system, an XG-PON system, and a GPON system.
  • the wavelength not supported by OLT 101 may be 1260-1280 nm, 1290-1310 nm, and 1298-1302 nm.
  • the wavelength supported by OLT 101 is 1284-1288 nm.
  • OLT 101 can send broadcast information in a certain channel, and at this time, ONUs outside a certain channel cannot receive the broadcast information.
  • PON system 100 includes a 50G-GPON channel and a 10G-GPON channel.
  • OLT 101 sends broadcast information in the 50G-GPON channel. Since the downstream wavelengths of the 50G-GPON channel and the 10G-GPON channel are not the same, the filter of the ONU belonging to the 10G-GPON channel cannot correctly obtain the broadcast information, that is, the ONU of the 10G-GPON channel cannot receive the broadcast information.
  • the first ONU may belong to the 50G-GPON channel.
  • the second ONU may belong to the 50G-GPON channel, the 10G-GPON channel, or the G-GPON channel.
  • the broadcast information includes the upstream wavelength information supported by OLT 101 (referred to as the upstream wavelength information).
  • the broadcast information may be a downstream frame start signal (frame start signal, FS) frame.
  • FS frame start signal
  • the allocation identifier in the downstream FS frame is used to indicate the upstream wavelength information. This is described below.
  • FIG4 is a schematic diagram of the structure of a downlink FS frame provided in an embodiment of the present application.
  • the downlink FS frame consists of a downlink FS frame header field and a FS payload field.
  • the downlink FS frame header field consists of a fixed-length HLend structure and two variable-length partitions.
  • the two variable-length partitions are a bandwidth map (BWmap) field and a physical layer operations administration and maintenance downstream (PLOAMd) field.
  • BWmap field is a series of 8-byte allocation structure fields.
  • the actual length of the BWmap field is 8 ⁇ N bytes. N is an integer greater than or equal to 1.
  • the allocation structure field includes an allocation identifier (Alloc-ID) field, a flag field, a start time field, a CrantSize field, a forced wake-up indication (FWI) field, a Burst Profile field, and a header error correction (HEC) field.
  • the value of Alloc-ID is a 14-bit number used to identify the recipient of the corresponding upstream bandwidth allocation: a specific service bearer entity within a specific ONU, or a specific contention-based function that can be used by multiple qualified ONUs.
  • Alloc-ID can be divided into directed (associated with a unique ONU) and broadcast. Table 1 shows the functional description of Alloc-ID.
  • ⁇ 0 refers to the basic line rate, in Gbit/s.
  • ⁇ 0, ⁇ 1, and ⁇ 2 refer to different line rate coefficients.
  • the value of Alloc-ID can be used to indicate the upstream wavelength information supported by OLT 101.
  • the following description is taken as an example that the upstream wavelength used by OLT 101 includes 3 wavelengths.
  • the 3 wavelengths include wavelength 1, wavelength 2, and wavelength 3.
  • the 3 wavelengths can be divided into wavelengths supported by OLT 101 and wavelengths not supported by OLT 101. There are 8 allocation methods for the 3 wavelengths.
  • Table 2 is an example combination of allocation methods for the 3 wavelengths.
  • OLT 101 may establish a correspondence between Table 2 and the Alloc-ID in Table 1.
  • Table 3 is a functional description of the modified Alloc-ID.
  • OLT 101 establishes a correspondence between the value 1024 of Alloc-ID and the upstream line rate ⁇ 0 ⁇ 0, the wavelength supported by OLT 101 (wavelength 1), and the wavelengths not supported by OLT 101 (wavelength 2 and wavelength 3). Similarly, OLT 101 can also establish a correspondence between Alloc-ID and the upstream line rate ⁇ 0 ⁇ 0 and other supported wavelengths. Table 4 is an example of the correspondence provided in the embodiment of the present application.
  • the first ONU When the first ONU receives a downstream authorization structure with Alloc-ID of 1020, it indicates that OLT 101 does not support any wavelength. At this time, the first ONU does not start registration.
  • the first ONU receives a downstream FS frame with Alloc-ID of 1024, it indicates that the wavelength supported by OLT 101 is wavelength 1, and the wavelengths not supported by OLT 101 are wavelength 2 and wavelength 3. If the wavelength of the transmitter of the first ONU is wavelength 1, the first ONU can start registration, the upstream line rate is ⁇ 0 ⁇ 0, and 1024 is used to transmit the sequence number response. If the wavelength of the transmitter of the first ONU is a wavelength other than wavelength 1, such as wavelength 2, the first ONU does not start registration.
  • the upstream wavelength information supported by the OLT 101 can be indicated by Alloc-ID.
  • the OLT also establishes a correspondence between the value 1025 of Alloc-ID and the upstream line rate ⁇ 0 ⁇ 1, the wavelength supported by the OLT 101 (wavelength 1), and the wavelengths not supported by the OLT 101 (wavelength 2 and wavelength 3).
  • the OLT 101 can also establish a correspondence between the Alloc-ID and the upstream line rate ⁇ 0 ⁇ 1 and other supported wavelengths.
  • Table 5 is an example of the correspondence provided in the embodiment of the present application.
  • OLT 101 also establishes a correspondence between the value 1026 of Alloc-ID and the upstream line rate ⁇ 0 ⁇ 2, the wavelength supported by OLT 101 (wavelength 1), and the wavelengths not supported by OLT 101 (wavelength 2 and wavelength 3). Similarly, OLT 101 can also establish a correspondence between Alloc-ID and the upstream line rate ⁇ 0 ⁇ 2 and other supported wavelengths. Table 6 is an example of the correspondence provided in the embodiment of the present application.
  • OLT 101 also establishes a correspondence between the value 1027 of Alloc-ID and the uplink line rate ( ⁇ 0 ⁇ 0, ⁇ 0 ⁇ 1 or ⁇ 0 ⁇ 2), the wavelength supported by OLT (wavelength 1), and the wavelength not supported by OLT (wavelength 2 and wavelength 3). Similarly, OLT 101 can also establish a correspondence between Alloc-ID and the uplink line rate ( ⁇ 0 ⁇ 0, ⁇ 0 ⁇ 1 or ⁇ 0 ⁇ 2), and other supported wavelengths.
  • Table 7 is an example of the correspondence provided in the embodiment of the present application.
  • Tables 3 to 7 are only an example of indicating the upstream wavelength information by Alloc-ID provided in the embodiments of the present application. In practical applications, those skilled in the art may define other specific Alloc-IDs to indicate the upstream wavelength information.
  • OLT 101 replaces 1020, 1024, 1028 ... 1044 and 1048 in Table 4 by Alloc-IDs 1020 to 1027.
  • OLT 101 replaces 1021, 1025, 1029 ... 1045 and 1049 in Table 5 by Alloc-IDs 1028 to 1035.
  • OLT 101 replaces 1022, 1026, 1030 ... 1046 and 1050 in Table 6 by Alloc-IDs 1036 to 1043.
  • OLT 101 replaces 1023, 1027, 1031...1047 and 1051 in Table 7 with Alloc-ID 1044 ⁇ 1051.
  • the present application describes the upstream wavelength used by OLT 101 as including 3 wavelengths.
  • OLT 101 indicates the upstream wavelength information and the upstream line rate through 8 ⁇ 4 Alloc-IDs.
  • the number of upstream wavelengths used by the OLT can be other values.
  • the upstream wavelength used by the OLT includes 4 wavelengths.
  • the 4 wavelengths can be allocated as supported wavelengths and unsupported wavelengths. There are 16 ways to allocate the 4 wavelengths.
  • the OLT can indicate the upstream wavelength information and the upstream line rate through 16 ⁇ 4 Alloc-IDs.
  • the broadcast information can be a downlink FS frame.
  • the broadcast information can also be a downlink physical frame or a physical layer operations administration and maintenance (PLOAM) message, which will be described below.
  • PLOAM physical layer operations administration and maintenance
  • the downlink physical frame is also called a downlink PHY frame.
  • FIG5 is a schematic diagram of the structure of the downlink physical frame provided in an embodiment of the present application.
  • the downlink physical frame 501 consists of a physical synchronization block (PSBd) and a PHY frame payload.
  • the physical synchronization block includes a physical synchronization sequence (PSync), a multiframe counter (SFC) structure, and an operation control (OC) structure.
  • the OC structure includes a 51-bit OC body and a 13-bit HEC field.
  • the OC body includes a passive optical network identifier type (PIT) field, a passive optical network identifier (PON-ID) field, an R field, a C field, and a TOL field.
  • PIT passive optical network identifier type
  • PON-ID passive optical network identifier
  • the R field is a reserved field.
  • the value in the C field is a transmitted light level reference point indicator.
  • the value in the TOL field can indicate the transmit power sent by the current OLT CT transceiver to the ODN or the transmit power reaching the expander transceiver.
  • the PON-ID field includes a management tag field and a downlink wavelength channel identifier (DWLCH ID) field.
  • the size of the DWLCH ID field is 4 bits.
  • the upstream wavelength information can be located in the DWLCH ID field.
  • Fig. 6 is a schematic diagram of the structure of a PLOAM message provided by an embodiment of the present application.
  • a PLOAM message 601 includes an ONU-ID field, a message type ID field, a SeqNo field, a message content field, and a message integrity check (MIC) field.
  • Table 8 is a description of the size and function of each field in the PLOAM message 601.
  • the uplink wavelength information may be located in the message content field.
  • the message content field includes an uplink wavelength information field and a Padding field.
  • the uplink wavelength information field is used to carry the uplink wavelength information.
  • the Padding field is used to fill in useless data, such as bit 0.
  • the uplink wavelength information field may be located in the fifth byte in the PLOAM message 601.
  • the uplink wavelength information may be located in the last 4 bits in the fifth byte.
  • the 8 bits in the fifth byte may be represented as 0000ABCD. "0" represents bit 0.
  • the PLOAM message 601 may be a burst profile message.
  • the message content field in the burst profile message includes: It includes the burst configuration control 1 field, the burst configuration control 2 field, the delimiter control field, the delimiter mode field, the preamble descriptor field, the preamble word count field, the preamble mode field, the PON-TAG field, the downstream PON identification field, the ONURssiMin field and the ONURssiMax field.
  • the downstream PON identification field is also called the downstream PON-ID field.
  • the downstream PON identification field is located in bytes 35 to 38 in the burst_profile message.
  • the upstream wavelength information can be carried by the downstream PON identification field.
  • the upstream wavelength information can be located in the first byte of the downstream PON identification field.
  • the bit size of the upstream wavelength information is 4 bits
  • the upstream wavelength information can be located in the last 4 bits in the first byte.
  • the 8 bits in the first byte can be expressed as 0000ABCD. "0" represents bit 0.
  • ABCD time division multiplexing
  • the number of bits of the upstream wavelength information supported by the OLT may be equal to the number of wavelengths indicated by the upstream wavelength information.
  • the upstream wavelengths used by the OLT 101 include 3 wavelengths.
  • the 3 wavelengths include wavelength 1, wavelength 2, and wavelength 3.
  • the upstream wavelength information is ABC.
  • A, B, and C represent one bit respectively.
  • the upstream wavelength information includes 3 bits, that is, the number of bits of the upstream wavelength information is 3.
  • the 3 wavelengths correspond to the 3 bits one by one.
  • A corresponds to wavelength 1.
  • B corresponds to wavelength 2.
  • C corresponds to wavelength 3.
  • Each bit is used to indicate whether the OLT 101 supports the corresponding wavelength. For example, when the value of A is 0, it indicates that the OLT does not support wavelength 1. When the value of A is 1, it indicates that the OLT supports wavelength 1.
  • B and C refer to the description of A.
  • the three wavelengths may be 1260-1280 nanometers, 1284-1288 nanometers, and 1290-1310 nanometers.
  • Wavelength 1 may be any one of the three wavelengths.
  • Wavelength 2 may be any one of the three wavelengths except wavelength 1.
  • Wavelength 3 is a wavelength other than wavelength 1 and wavelength 2 among the three wavelengths. For example, wavelength 1 is 1260-1280 nanometers. Wavelength 2 is 1284-1288 nanometers. Wavelength 3 is 1290-1310 nanometers. For another example, wavelength 1 is 1260-1280 nanometers. Wavelength 2 is 1290-1310 nanometers. Wavelength 3 is 1284-1288 nanometers.
  • the upstream wavelength used by OLT 101 may include 4 wavelengths.
  • the 4 wavelengths include the aforementioned 3 wavelengths and wavelength 4.
  • the upstream wavelength information is ABCD. A, B, C, and D represent one bit respectively.
  • the upstream wavelength information includes 4 bits, that is, the number of bits of the upstream wavelength information is 4.
  • the 4 wavelengths correspond to the 4 bits one by one. A corresponds to wavelength 1. B corresponds to wavelength 2. C corresponds to wavelength 3. D corresponds to wavelength 4. Each bit is used to indicate whether OLT 101 supports the corresponding wavelength.
  • the four wavelengths may be 1260-1280 nanometers, 1284-1288 nanometers, 1290-1310 nanometers, and 1298-1302 nanometers.
  • Wavelength 1 may be any one of the four wavelengths.
  • Wavelength 2 is any one of the four wavelengths except wavelength 1.
  • Wavelength 3 is any one of the four wavelengths except wavelength 1 and wavelength 2.
  • Wavelength 4 is a wavelength of the four wavelengths except wavelength 1, wavelength 2, and wavelength 3.
  • wavelength 1 is 1260-1280 nanometers.
  • Wavelength 2 is 1284-1288 nanometers.
  • Wavelength 3 is 1290-1310 nanometers.
  • Wavelength 4 is 1298-1302 nanometers.
  • wavelength 1 is 1260-1280 nanometers.
  • Wavelength 2 is 1290-1310 nanometers.
  • Wavelength 3 is 1284-1288 nanometers.
  • Wavelength 4 is 1298-1302 nanometers.
  • Figure 7 is a first flow chart of the access method provided by an embodiment of the present application. As shown in Figure 7, the access method includes the following steps.
  • a first ONU receives broadcast information from an OLT, where the broadcast information includes information about upstream wavelengths supported by the OLT.
  • the upstream wavelength supported by the OLT does not include the wavelength of the first ONU, and the first ONU does not start registration according to the upstream wavelength information supported by the OLT; or, the upstream wavelength supported by the OLT includes the wavelength of the first ONU, and the first ONU starts registration according to the upstream wavelength information supported by the OLT.
  • the first ONU When the upstream wavelength supported by the OLT does not include the wavelength of the transmitter of the first ONU, the first ONU is used to not start registration according to the upstream wavelength information supported by the OLT.
  • the upstream wavelengths supported by the OLT are wavelength 1 and wavelength 2
  • the upstream wavelength not supported by the OLT 101 is wavelength 3.
  • the wavelength of the transmitter of the first ONU is wavelength 3.
  • the upstream wavelength supported by the OLT includes the wavelength of the transmitter of the first ONU
  • the first ONU is used to start registration according to the upstream wavelength information supported by the OLT.
  • Fig. 8 is a second flow chart of the access method provided in the embodiment of the present application. As shown in Fig. 8, the access method includes the following steps.
  • the OLT transmits broadcast information to the first ONU, where the broadcast information includes upstream wavelength information supported by the OLT, the upstream wavelength supported by the OLT does not include the wavelength of the first ONU, and the upstream wavelength information supported by the OLT is used for the first ONU not to start registration; or, the upstream wavelength supported by the OLT includes the wavelength of the first ONU, and the upstream wavelength information supported by the OLT is used for the first ONU to start registration.
  • the upstream wavelength information supported by the OLT is used for the first ONU to not start registration.
  • the upstream wavelength information supported by the OLT is used for the first ONU to start registration.
  • the broadcast information is a PLOAM message or a downstream physical frame.
  • the broadcast information is a downstream FS frame.
  • the allocation identifier in the downstream FS frame is used to indicate the upstream wavelength information supported by the OLT.
  • the OLT is connected to multiple ONUs through the ODN. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelengths supported by the OLT do not include the first wavelength.
  • FIG. 9 is a schematic diagram of the structure of the first ONU provided by an embodiment of the present application.
  • the first ONU 900 includes a receiver 901 and a processor 902.
  • Receiver 901 is used to receive broadcast information from OLT.
  • OLT is connected to multiple ONUs through ODN.
  • Multiple ONUs include the first ONU.
  • Processor 902 can be a central processing unit (CPU), a network processor (NP) or a combination of CPU and NP.
  • Processor 902 can further include a hardware chip or other general-purpose processor.
  • the above-mentioned hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • Processor 902 is used to not start registration according to upstream wavelength information.
  • the wavelength of the first ONU 900 is an upstream wavelength not supported by OLT.
  • processor 902 is used to start registration according to upstream wavelength information.
  • the wavelength of the first ONU 900 is the upstream wavelength supported by the OLT.
  • the first ONU 900 may further include a transmitter.
  • the transmitter After the processor 902 starts registration according to the upstream wavelength information supported by the OLT, the transmitter is used to send an upstream optical signal to the OLT.
  • the wavelength of the upstream optical signal is within the upstream wavelength range supported by the OLT.
  • FIG10 is a schematic diagram of the structure of the OLT provided in an embodiment of the present application.
  • the OLT 1000 includes a processor 1001 and a transmitter 1002.
  • the processor 1001 is used to generate broadcast information.
  • the transmitter 1002 is used to transmit the broadcast information to the first ONU.
  • the OLT 1000 is connected to a plurality of ONUs via an ODN.
  • the plurality of ONUs include a first ONU.
  • the broadcast information includes the upstream wavelength information supported by the OLT 1000.
  • the upstream wavelength information is used when the first ONU does not start registration, and the wavelength of the first ONU is an upstream wavelength not supported by the OLT.
  • the upstream wavelength information is used when the first ONU starts registration.
  • the wavelength of the first ONU is an upstream wavelength supported by the OLT.
  • the OLT 1000 may further include a receiver.
  • the receiver is used to receive an upstream optical signal from the first ONU.
  • the wavelength of the upstream optical signal is within the upstream wavelength range supported by the OLT 1000.
  • the description of the first ONU 900 and/or OLT 1000 is similar to the description of the PON system in the aforementioned Figures 1 to 6. Therefore, the description of the first ONU 900 and/or OLT 1000 can refer to the description in any of the aforementioned Figures 1 to 6.
  • the broadcast information is a PLOAM message or a downstream physical frame.
  • the broadcast information is a downstream FS frame.
  • the allocation identifier in the downstream FS frame is used to indicate the upstream wavelength information supported by the OLT.
  • the OLT is connected to multiple ONUs through an ODN.
  • the multiple ONUs include a first ONU and a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has registered with the OLT.
  • the upstream wavelength for communication between the second ONU and the OLT is the first wavelength.
  • the upstream wavelengths supported by the OLT do not include the first wavelength.
  • the first ONU 900 and/or the OLT 1000 may further include a memory.
  • the memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), or a flash memory, etc.
  • the volatile memory may be a random access memory (RAM).
  • the memory may be used to store the upstream wavelength information supported by the OLT.

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Abstract

本申请提供了一种接入方法，应用于光通信领域。接入方法包括以下步骤：第一ONU从OLT接收广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。广播信息包括OLT支持的上行波长信息。当OLT支持的上行波长不包括第一ONU的上行波长时，第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的上行波长时，第一ONU启动注册。在本申请的技术方案中，通过在下行方向广播当前OLT端口支持的上行波长信息，可以避免使用当前OLT端口不支持的上行波长的ONU接入PON系统，从而提高光通信的可靠性。

Description

接入方法、PON系统、第一ONU和OLT
本申请要求于2023年03月06日提交国家知识产权局、申请号为202310246584.X、发明名称为“接入方法、PON系统、第一ONU和OLT”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光通信领域，尤其涉及接入方法、无源光网络(passive optical network，PON)系统、第一光网络单元(optical network unit，ONU)和光线路终端(optical line termination，OLT)。
背景技术
PON系统包括OLT、光配线网(optical distribution network，ODN)以及多个ONU。PON系统可以通过波分复用来允许接收多个不同的波长。例如，OLT中可以设置有波分复用(wavelength division multiplexing，WDM)装置。在上行方向，多个ONU用于输出不同波长的多个上行光信号。ODN用于对多个上行光信号进行合束，向OLT传输合束后的上行光信号。OLT用于通过WDM装置对合束后的上行光信号进行解复用，得到多个上行光信号。OLT对多个上行光信号分别进行处理。
在实际应用中，当OLT支持的上行波长不包括ONU的上行波长时，OLT无法正常接收上行光信号，从而降低了光通信的可靠性。
发明内容
本申请提供了一种接入方法、PON系统、第一ONU和OLT，通过在下行方向广播当前OLT端口支持的上行波长信息，可以避免使用当前OLT端口不支持的上行波长的ONU接入PON系统，从而提高光通信的可靠性。
本申请第一方面提供了一种接入方法。接入方法包括以下步骤：第一ONU从OLT接收广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。广播信息包括OLT支持的上行波长信息。当OLT支持的上行波长不包括第一ONU的上行波长时，第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的上行波长时，第一ONU启动注册。
在第一方面的一种可选方式中，多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。在本申请中，通过广播OLT支持的上行波长信息，可以避免不同的ONU之间产生冲突，从而提高光通信的可靠性。
在第一方面的一种可选方式中，OLT包括第一OLT和第二OLT。多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。当多个上行光信号的波长相同时，会导致波长冲突，从而降低光通信的可靠性。在本申请中，通过广播OLT支持的上行波长信息，可以避免不同的ONU之间产生冲突，从而提高光通信的可靠性。
在第一方面的一种可选方式中，第一波长为1260～1280纳米、1290～1310纳米或1284～1288纳米。
在第一方面的一种可选方式中，OLT支持的上行波长信息的位数等于上行波长信息所指示的波长数量。在本申请中，通过控制上行波长信息的位数，可以降低广播信息的大小，从而节约传输资源。
在第一方面的一种可选方式中，OLT支持的上行波长信息包括第一位、第二位和第三位。第一位用于指示OLT是否支持上行波长1260～1280纳米。第二位用于指示OLT是否支持上行波长1290～1310纳米。第三位用于指示OLT是否支持上行波长1284～1288纳米。
在第一方面的一种可选方式中，OLT支持的上行波长信息包括第一位、第二位、第三位和第四位。第一位用于指示OLT是否支持上行波长1260～1280纳米。第二位用于指示OLT是否支持上行波长1290～1310纳米。第三位用于指示OLT是否支持上行波长1284～1288纳米。第四位用于指示OLT是否支持上行波长1298～1302纳米。
在第一方面的一种可选方式中，广播信息为下行物理帧。OLT支持的上行波长信息位于下行物理帧 的无源光网络标识(passive optical network identifier，PON-ID)字段。
在第一方面的一种可选方式中，广播信息为物理层操作管理和维护(physical layer operations administration and maintenance，PLOAM)消息。OLT支持的上行波长信息位于PLOAM消息中的消息内容字段。
在第一方面的一种可选方式中，PLOAM消息为突发配置消息。OLT支持的上行波长信息位于消息内容字段中的下行PON标识字段。
在第一方面的一种可选方式中，广播信息为下行帧起始信号(frame start signal，FS)帧。下行FS帧中的分配标识符用于指示OLT支持的上行波长信息。
本申请第二方面提供了一种接入方法。接入方法包括以下步骤：OLT向第一ONU传输广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。广播信息包括OLT支持的上行波长信息。当OLT支持的上行波长不包括第一ONU的上行波长时，OLT支持的上行波长信息用于第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的上行波长时，OLT支持的上行波长信息用于第一ONU启动注册。
在第二方面的一种可选方式中，多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长在第二方面的一种可选方式中，OLT包括第一OLT和第二OLT。多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
本申请第三方面提供了一种PON系统。PON系统包括OLT、ODN和多个ONU。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。OLT用于向第一ONU传输广播信息。广播信息包括OLT支持的上行波长信息。当OLT支持的上行波长不包括第一ONU的上行波长时，第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的上行波长时，第一ONU启动注册。
在第三方面的一种可选方式中，多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长在第三方面的一种可选方式中，OLT包括第一OLT和第二OLT。多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
本申请第四方面提供了一种第一ONU。第一ONU包括接收机和处理器。接收机用于从OLT接收广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。OLT支持的上行波长不包括第一ONU的上行波长，处理器用于根据OLT支持的上行波长信息不启动注册。或，OLT支持的上行波长包括第一ONU的上行波长，处理器用于根据OLT支持的上行波长信息启动注册。
在第四方面的一种可选方式中，多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
在第四方面的一种可选方式中，第一ONU还包括发射机。在处理器根据OLT支持的上行波长信息启动注册后，发射机用于向OLT发送上行光信号。上行光信号的波长在OLT支持的上行波长范围内。
本申请第五方面提供了一种OLT。OLT包括处理器和发射机。处理器用于生成广播信息。发射机用于向第一ONU传输广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。广播信息包括OLT支持的上行波长信息。当OLT支持的上行波长不包括第一ONU的上行波长时，OLT支持的上行波长信息用于第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的上行波长时，OLT支持的上行波长信息用于第一ONU启动注册。
在第五方面的一种可选方式中，多个ONU还包括第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
在第五方面的一种可选方式中，OLT还包括接收机。接收机用于从第一ONU接收上行光信号。上行光信号的波长在OLT支持的上行波长范围内。
应理解，关于第二方面、第三方面、第四方面或第五方面中可选方式的描述，和前述第一方面中可 选方式的描述存在相似之处。因此，关于第二方面、第三方面、第四方面或第五方面中可选方式的描述可以参考前述第一方面中可选方式的描述。例如，OLT支持的上行波长信息的位数等于上行波长信息所指示的波长数量。又如，广播信息为下行物理帧。OLT支持的上行波长信息位于下行物理帧的无源光网络标识字段。
本申请第六方面提供了一种计算机存储介质，其特征在于，所述计算机存储介质中存储有指令，所述指令在计算机上执行时，使得所述计算机执行如第一方面或第一方面任意一种实施方式所述的方法；或使得所述计算机执行如第二方面或第二方面任意一种实施方式所述的方法。
本申请第七方面提供了一种计算机程序产品，其特征在于，所述计算机程序产品在计算机上执行时，使得所述计算机执行如第一方面或第一方面任意一种实施方式所述的方法；或使得所述计算机执行如第二方面或第二方面任意一种实施方式所述的方法。
附图说明
图1为本申请实施例提供的PON系统的第一个结构示意图；
图2为本申请实施例提供的PON系统的第二个结构示意图；
图3为本申请实施例提供的PON系统的第三个结构示意图；
图4为本申请实施例提供的下行FS帧的结构示意图；
图5为本申请实施例提供的下行物理帧的结构示意图；
图6为本申请实施例提供的PLOAM消息的结构示意图；
图7为本申请实施例提供的接入方法的第一个流程示意图；
图8为本申请实施例提供的接入方法的第二个流程示意图；
图9为本申请实施例提供的第一ONU的结构示意图；
图10为本申请实施例提供的OLT的结构示意图。
具体实施方式
本申请提供了一种接入方法、无源光网络(passive optical network，PON)系统、第一光网络单元(optical network unit，ONU)和光线路终端(optical line termination，OLT)，通过在下行方向广播当前OLT端口支持的上行波长信息，可以避免使用当前OLT端口不支持的上行波长的ONU接入PON系统，从而提高光通信的可靠性。应理解，本申请中使用的“第一”、“第二”等仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。另外，为了简明和清楚，本申请多个附图中重复参考编号和/或字母。重复并不表明各种实施例和/或配置之间存在严格的限定关系。
在PON系统中，OLT可以通过波分复用来允许接收多个不同的波长。具体地，在上行方向，多个ONU用于输出不同波长的多个上行光信号。ODN用于对多个上行光信号进行合束，向OLT传输合束后的上行光信号。OLT用于通过波分复用(wavelength division multiplexing，WDM)装置对合束后的上行光信号进行解复用，得到多个上行光信号。但是，当OLT支持的上行波长不包括ONU的上行波长时，OLT无法正常接收上行光信号，从而降低了光通信的可靠性。
为此，本申请提供了一种PON系统。图1为本申请实施例提供的PON系统的第一个结构示意图。如图1所示，PON系统100包括OLT 101、ODN 102和多个ONU。在图1的示例中，多个ONU包括ONU 103～105。OLT 101通过ODN 102和多个ONU相连。ODN 102包括分光/合路器。在下行方向，OLT 101通过分光器将下行光信号分配到所有的ONU。在上行方向，来自各个光终端的上行光信号通过合路器耦合到OLT 101。OLT 101用于向第一ONU传输广播信息。第一ONU为还未接入OLT 101的ONU。第一ONU可以为ONU 103～105中的任意一个ONU。广播信息包括OLT 101支持的上行波长信息。当第一ONU的发射机的波长为OLT 101不支持的上行波长时，第一ONU用于根据OLT 101支持的上行波长信息不启动注册。例如，OLT 101支持的上行波长为波长1和波长2，OLT 101不支持的上行波长为波长3。第一ONU的发射机的波长为波长3。当第一ONU的发射机的波长为OLT 101支持的上行波长时，第一ONU用于根据OLT 101支持的上行波长信息启动注册。其中，启动注册可以是指启动第一ONU的发射机或响应OLT 101的注册授权。
在本申请实施例中，只有在启动注册后，第一ONU才有向OLT 101传输上行光信号的能力。当OLT 101支持的上行波长不包括第一ONU的发射机的波长时，第一ONU不会启动注册，即不会向OLT 101传输上行光信号。因此，本申请实施例可以提高光通信的可靠性。在第一ONU启动注册后，第一ONU可以通过 发射机向OLT 101发送上行光信号。上行光信号的波长在OLT 101支持的上行波长范围内。
应理解，“第一ONU的发射机的波长为OLT 101支持的上行波长”是“第一ONU启动注册”的必要条件。因此，即使第一ONU的发射机的波长为OLT 101支持的上行波长，第一ONU也可能不启动注册。
OLT 101使用的上行波长取决于OLT 101的硬件配置。例如，若OLT 101中设计有可以分别处理波长1和波长2的光模块，则OLT 101使用的上行波长包括波长1和波长2。OLT 101不使用的上行波长为除波长1和波长2以外的波长。OLT 101支持的上行波长简称为OLT 101支持的波长。OLT 101不支持的上行波长简称为OLT 101不支持的波长。OLT 101不支持的波长可以是OLT 101不使用的上行波长，也可以是OLT 101使用的上行波长。当OLT 101不支持的波长是OLT 101使用的波长时，第一ONU的上行波长会与PON系统100中第二ONU的上行波长产生冲突。例如，第二ONU的上行波长为1290～1310纳米。第一ONU的上行波长为1290～1310纳米。又如，第二ONU的上行波长为1290～1310纳米。第一ONU的上行波长为1298～1302纳米。其中，第二ONU为已经接入OLT 101的ONU，即第二ONU可以通过ODN 102向OLT 101传输上行光信号。第二ONU和OLT 101之间的通信波长为第一波长。因此，第一波长为OLT 101使用的上行波长。
当第一ONU为前述图1中的ONU 103时，第二ONU可以为图1中的ONU 104和/或ONU 105。在第一ONU启动注册后，第一ONU可以接入OLT 101。第二ONU和第一ONU可以通过ODN 102接入同一个OLT，也可以接入不同的OLT。下面对此分别进行描述。
图2为本申请实施例提供的PON系统的第二个结构示意图。如图2所示，PON系统包括OLT 101、ODN 102、第一ONU和第二ONU。OLT 101包括WDM 201、光模块202和光模块203。光模块202用于处理波长1的上行光信号。光模块203用于处理波长2的上行光信号。此时，OLT 101使用的波长包括波长1和波长2。OLT 101通过ODN 102和第一ONU、第二ONU相连。第二ONU和OLT 101之间的通信波长为第一波长。第一波长也称为波长1。第二ONU传输的上行光信号经过ODN 102和WDM 201后进入光模块202。光模块202用于处理第二ONU传输的上行光信号。第一ONU的波长为波长2。第一ONU的上行光信号会经过ODN 102和WDM 201后进入光模块203。光模块203用于处理第一ONU的上行光信号。在图2中，第二ONU和第一ONU通过ODN 102连接同一个OLT。
图3为本申请实施例提供的PON系统的第三个结构示意图。如图3所示，PON系统包括OLT 101、WDM 201、ODN 102、第一ONU和第二ONU。OLT 101包括第一OLT 301和第二OLT 302。OLT 101通过WDM 201和ODN 102连接两个ONU。第一OLT 301用于处理波长1的上行光信号。第二OLT 302用于处理波长2的上行光信号。此时，OLT 101使用的波长包括波长1和波长2。第二ONU的波长为波长1。第二ONU传输的上行光信号经过ODN 102和WDM 201后进入第一OLT 301。第一OLT 301用于处理第二ONU传输的上行光信号。第一ONU的波长为波长2。第一ONU的上行光信号会经过ODN 102和WDM 201后进入第二OLT 302。第二OLT 302用于处理第一ONU的上行光信号。在图3中，第二ONU和第一ONU通过ODN 102连接不同的OLT。
在本申请实施例中，OLT 101使用的波长可以为3个波长或4个波长。3个波长为1260～1280纳米、1284～1288纳米和1290～1310纳米。4个波长为1260～1280纳米、1284～1288纳米、1290～1310纳米和1298～1302纳米。其中，1260～1280纳米、1284～1288纳米、1290～1310纳米和1298～1302纳米分别表征一个波长。1260～1280纳米的中心波长为1270纳米。1284～1288纳米的中心波长为1286纳米。1290～1310纳米的中心波长为1300纳米。1298～1302纳米的中心波长为1300纳米。第一波长可以为3个波长或4个波长中的任意一个波长。
在前述图1～图3的示例中，PON系统100可以为50G-PON(50-gigabit-capable passive optical network,50G-GPON)系统。OLT 101使用的上行波长可以为前述3个波长或4个波长。PON系统100也可以为50G-PON系统和GPON(gigabit PON)系统的组合。此时，OLT 101不支持的波长为1290～1310纳米和1298～1302纳米。OLT 101支持的波长可以为前述3个波长或4个波长中除1290～1310纳米和1298～1302纳米以外的波长。PON系统100也可以为50G-PON系统和XG-PON(10-gigabit-capable passive optical network，10G-GPON)系统的组合。此时，OLT 101不支持的波长可以为1260～1280纳米。OLT 101支持的波长可以为前述3个波长或4个波长中除1260～1280纳米以外的波长。PON系统100也可以为50G-PON系统、XG-PON系统和GPON系统的组合。此时，OLT 101不支持的波长可以为 1260～1280纳米、1290～1310纳米和1298～1302纳米。OLT 101支持的波长为1284～1288纳米。
应理解，OLT 101可以在某个通道发送广播信息，此时，某个通道以外的ONU无法接收到广播信息。例如，PON系统100包括50G-GPON通道和10G-GPON通道。OLT 101在50G-GPON通道发送广播信息。由于50G-GPON通道和10G-GPON通道的下行波长并不相同，属于10G-GPON通道的ONU的滤波器无法正确获取广播信息，即10G-GPON通道的ONU无法接收到广播信息。在本申请实施例中，第一ONU可以属于50G-GPON通道。第二ONU可以属于50G-GPON通道、10G-GPON通道或G-GPON通道。根据前面的描述可知，广播信息包括OLT 101支持的上行波长信息(简称为上行波长信息)。广播信息可以为下行帧起始信号(frame start signal，FS)帧。下行FS帧中的分配标识符用于指示上行波长信息。下面对此进行描述。
图4为本申请实施例提供的下行FS帧的结构示意图。如图4所示，下行FS帧由下行FS帧头字段和FS净荷字段组成。下行FS帧头字段由一个固定长度的HLend结构和两个可变长度分区。两个可变长度分区为带宽映射(bandwidth map，BWmap)字段和下行物理层操作管理维护(physical layer operations administration and maintenance downstream，PLOAMd)字段。BWmap字段是一个8字节分配结构字段的系列。BWmap字段的实际长度为8×N字节。N为大于或等于1的整数。分配结构字段包括分配标识符(allocation identifier，Alloc-ID)字段、标志位字段、起始时间字段、CrantSize字段、强制唤醒指示(forced wake-up indication，FWI)字段、Burst Profile字段和标头错误控制(header error correction，HEC)字段。其中，Alloc-ID的值为14位数字，用于标识相应上行带宽分配的接收者：特定ONU内的特定业务承载实体，或可由多个具备条件的ONU使用的特定基于竞争的功能。Alloc-ID可以被分为定向(与唯一的ONU关联)和广播。表一为Alloc-ID的功能说明。
表一
在表一中，ρ0是指基本线路速率，单位为吉比特/秒(Gbit/s)。Φ0、Φ1和Φ2是指不同的线路速率系数。在本申请实施例中，可以通过Alloc-ID的值来指示OLT 101支持的上行波长信息。下面以OLT 101使用的上行波长包括3个波长为例进行描述。3个波长包括波长1、波长2和波长3。3个波长可以分为OLT 101支持的波长和OLT 101不支持的波长。3个波长的分配方式包括8种。表二为3个波长的分配方式的示例组合。

表二
OLT 101可以建立表二和前述表一中的Alloc-ID的对应关系。例如，表三为修改后的Alloc-ID的功能说明。
表三
在表三中，OLT 101建立了Alloc-ID的值1024与上行线速率ρ0Φ0、OLT 101支持的波长(波长1)、OLT 101不支持的波长(波长2和波长3)的对应关系。类似地，OLT 101还可以建立Alloc-ID与上行线速率ρ0Φ0、其它支持的波长的对应关系。表四为本申请实施例提供的对应关系的一个示例。
表四
当第一ONU接收到Alloc-ID为1020的下行授权结构时，表征OLT 101没有支持的波长。此时，第一ONU不启动注册。当第一ONU接收到Alloc-ID为1024的下行FS帧时，表征OLT 101支持的波长为波长1，OLT 101不支持的波长为波长2和波长3。若第一ONU的发射机的波长为波长1，则第一ONU可以启动注册，上行线速率为ρ0Φ0，并使用1024来传输序列号响应。若第一ONU的发射机的波长为波长1以外的波长，例如波长2，则第一ONU不启动注册。关于表四中其它Alloc-ID的描述，可以参考 1020和1024的描述。因此，在本申请实施例中，可以通过Alloc-ID来指示OLT 101支持的上行波长信息。
在前述表三中，OLT还建立了Alloc-ID的值1025与上行线速率ρ0Φ1、OLT 101支持的波长(波长1)、OLT 101不支持的波长(波长2和波长3)的对应关系。类似地，OLT 101还可以建立Alloc-ID与上行线速率ρ0Φ1、其它支持的波长的对应关系。表五为本申请实施例提供的对应关系的一个示例。
表五
在前述表三中，OLT 101还建立了Alloc-ID的值1026与上行线速率ρ0Φ2、OLT 101支持的波长(波长1)、OLT 101不支持的波长(波长2和波长3)的对应关系。类似地，OLT 101还可以建立Alloc-ID与上行线速率ρ0Φ2、其它支持的波长的对应关系。表六为本申请实施例提供的对应关系的一个示例。
表六
在前述表三中，OLT 101还建立了Alloc-ID的值1027与上行线速率(ρ0Φ0、ρ0Φ1或ρ0Φ2)、OLT支持的波长(波长1)、OLT不支持的波长(波长2和波长3)的对应关系。类似地，OLT 101还可以建立Alloc-ID与上行线速率(ρ0Φ0、ρ0Φ1或ρ0Φ2)、其它支持的波长的对应关系。表七为本申请实施例提供的对应关系的一个示例。

表七
应理解，前述表三～表七只是本申请实施例提供的通过Alloc-ID来指示上行波长信息的一个示例。在实际应用中，本领域技术人员可以定义其它具体的Alloc-ID来指示上行波长信息。例如，OLT 101通过Alloc-ID 1020～1027来替换表四中的1020、1024、1028……1044和1048。OLT 101通过Alloc-ID 1028～1035来替换表五中的1021、1025、1029……1045和1049。OLT 101通过Alloc-ID 1036～1043来替换表六中的1022、1026、1030……1046和1050。OLT 101通过Alloc-ID 1044～1051来替换表七中的1023、1027、1031……1047和1051。
应理解，在前述表三～表七的示例中，本申请以OLT 101使用的上行波长包括3个波长为例进行描述。OLT 101通过8×4个Alloc-ID来指示上行波长信息和上行线速率。在实际应用中，OLT使用的上行波长的数量可以为其它值。例如，OLT使用的上行波长包括4个波长。4个波长可以分配为支持的波长和不支持的波长。4个波长的分配方式包括16种。此时，OLT可以通过16×4个Alloc-ID来指示上行波长信息和上行线速率。
根据前面的描述可知，广播信息可以为下行FS帧。在实际应用中，广播信息也可以为下行物理帧或物理层操作管理和维护(physical layer operations administration and maintenance，PLOAM)消息，下分别面对此进行描述。
下行物理帧也称为下行PHY帧。图5为本申请实施例提供的下行物理帧的结构示意图。如图5所示，下行物理帧501由一个物理同步块(PSBd)和一个PHY帧净荷组成。物理同步块包括物理同步序列(PSync)、复帧计数器(SFC)结构和操作控制(operation control，OC)结构。OC结构包含一个51比特的OC主体和一个13比特的HEC字段。OC主体包括无源光网络标识类型(passive optical network identifier type，PIT)字段、无源光网络标识(passive optical network identifier，PON-ID)字段、R字段、C字段和TOL字段。其中，R字段为保留字段。C字段中的值为发射光电平参考点指示器。TOL字段中的值可以指示当前OLT CT收发器发送到ODN的发射功率或到达扩展器收发器的发射功率。PON-ID字段包括管理标签字段和下行波长信道标识(downlink wavelength channel identifier，DWLCH ID)字段。DWLCH ID字段的大小为4比特。上行波长信息可以位于DWLCH ID字段。
图6为本申请实施例提供的PLOAM消息的结构示意图。如图6所示，PLOAM消息601包括ONU-ID字段、消息类型标识(message type ID)字段、SeqNo字段、消息内容(message content)字段和消息完整性检查(message integrity check，MIC)字段。表八为PLOAM消息601中各个字段的大小及功能描述。
表八
上行波长信息可以位于消息内容字段。此时，消息内容字段包括上行波长信息字段和Padding字段。上行波长信息字段用于携带上行波长信息。Padding字段用于填充无用数据，例如比特0。上行波长信息字段可以位于PLOAM消息601中的第五字节。当上行波长信息的比特大小为4比特时，上行波长信息可以位于第五字节中的后4比特。此时，第五字节中的8个比特可以表示为0000ABCD。“0”表示比特0。关于ABCD的描述，可以参考后续的描述。
PLOAM消息601可以为突发配置(burst_profile)消息。burst_profile消息中的消息内容字段包 括突发配置控制1字段、突发配置控制2字段、分隔符控制字段、分隔符模式字段、前导码描述符字段、前导码字计数字段、前导码模式字段、PON-TAG字段、下行PON标识字段、ONURssiMin字段和ONURssiMax字段。其中，下行PON标识字段也称为downstream PON-ID字段。下行PON标识字段位于burst_profile消息中的第35～38字节。下行PON-ID字段中的内容仅对时分、波分复用(time wavelength division multiplexing，TWDM)PON有效，对(time division multiplexing，TDM)PON没有意义。因此，可以通过下行PON标识字段来承载上行波长信息。例如，上行波长信息可以位于下行PON标识字段中的第一字节。当上行波长信息的比特大小为4比特时，上行波长信息可以位于第一字节中的后4比特。此时，第一字节中的8个比特可以表示为0000ABCD。“0”表示比特0。关于ABCD的描述，可以参考后续的描述。
在实际应用中，OLT支持的上行波长信息的位数可以等于上行波长信息所指示的波长数量。例如，OLT 101使用的上行波长包括3个波长。3个波长包括波长1、波长2和波长3。上行波长信息为ABC。A、B和C分别表示一个比特位。此时，上行波长信息包括3个比特位，即上行波长信息的位数为3。3个波长和3个比特位一一对应。A对应波长1。B对应波长2。C对应波长3。每个比特位用于指示OLT 101是否支持相应的波长。例如，当A的值为0时，指示OLT不支持波长1。当A的值为1时，指示OLT支持波长1。类似地，关于B和C的描述，可以参考关于A的描述。
3个波长可以为1260～1280纳米、1284～1288纳米和1290～1310纳米。波长1可以为3个波长中的任意一个波长。波长2可以为3个波长中除波长1以外的任意一个波长。波长3为3个波长中除波长1和波长2以外的波长。例如，波长1为1260～1280纳米。波长2为1284～1288纳米。波长3为1290～1310纳米。又如，波长1为1260～1280纳米。波长2为1290～1310纳米。波长3为1284～1288纳米。
在实际应用中，OLT 101使用的上行波长可以包括4个波长。4个波长包括前述3个波长和波长4。上行波长信息为ABCD。A、B、C和D分别表示一个比特位。此时，上行波长信息包括4个比特位，即上行波长信息的位数为4。4个波长和4个比特位一一对应。A对应波长1。B对应波长2。C对应波长3。D对应波长4。每个比特位用于指示OLT 101是否支持相应的波长。
4个波长可以为1260～1280纳米、1284～1288纳米、1290～1310纳米和1298～1302纳米。波长1可以为4个波长中的任意一个波长。波长2为4个波长中除波长1以外的任意一个波长。波长3为4个波长中除波长1和波长2以外的任意一个波长。波长4为4个波长中除波长1、波长2和波长3以外的波长。例如，波长1为1260～1280纳米。波长2为1284～1288纳米。波长3为1290～1310纳米。波长4为1298～1302纳米。又如，波长1为1260～1280纳米。波长2为1290～1310纳米。波长3为1284～1288纳米。波长4为1298～1302纳米。
前面对本申请提供的PON系统进行描述，下面对本申请提供的接入方法进行描述。图7为本申请实施例提供的接入方法的第一个流程示意图。如图7所示，接入方法包括以下步骤。
在步骤701中，第一ONU从OLT接收广播信息，广播信息包括OLT支持的上行波长信息。
在步骤702中，OLT支持的上行波长不包括第一ONU的波长，第一ONU根据OLT支持的上行波长信息不启动注册；或，OLT支持的上行波长包括第一ONU的波长，第一ONU根据OLT支持的上行波长信息启动注册。
当OLT支持的上行波长不包括第一ONU的发射机的波长时，第一ONU用于根据OLT支持的上行波长信息不启动注册。例如，OLT支持的上行波长为波长1和波长2，OLT 101不支持的上行波长为波长3。第一ONU的发射机的波长为波长3。当OLT支持的上行波长包括第一ONU的发射机的波长时，第一ONU用于根据OLT支持的上行波长信息启动注册。
图8为本申请实施例提供的接入方法的第二个流程示意图。如图8所示，接入方法包括以下步骤。
在步骤801中，OLT向第一ONU传输广播信息，广播信息包括OLT支持的上行波长信息，OLT支持的上行波长不包括第一ONU的波长，OLT支持的上行波长信息用于第一ONU不启动注册；或，OLT支持的上行波长包括第一ONU的波长，OLT支持的上行波长信息用于第一ONU启动注册。
当OLT支持的上行波长不包括第一ONU的波长时，OLT支持的上行波长信息用于第一ONU不启动注册。当OLT支持的上行波长包括第一ONU的波长时，OLT支持的上行波长信息用于第一ONU启动注册。
应理解，关于接入方法的描述和前述图1～图6中对PON系统描述存在相似之处。因此，关于接入方 法的描述，可以参考前述图1～图6任一图中的描述。例如，广播信息为PLOAM消息或下行物理帧。又如，广播信息为下行FS帧。下行FS帧中的分配标识符用于指示OLT支持的上行波长信息。又如，OLT通过ODN和多个ONU相连。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
前面对本申请提供的接入方法进行描述，下面对本申请提供的第一ONU进行描述。图9为本申请实施例提供的第一ONU的结构示意图。如图9所示，第一ONU 900包括接收机901和处理器902。接收机901用于从OLT接收广播信息。OLT通过ODN和多个ONU相连。多个ONU包括第一ONU。处理器902可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。处理器902还可以进一步包括硬件芯片或其他通用处理器。上述硬件芯片可以是专用集成电路(application specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。处理器902用于根据上行波长信息不启动注册。第一ONU 900的波长为OLT不支持的上行波长。或，处理器902用于根据上行波长信息启动注册。第一ONU 900的波长为OLT支持的上行波长。
在其它实施例中，第一ONU 900还可以包括发射机。在处理器902根据OLT支持的上行波长信息启动注册后，发射机用于向OLT发送上行光信号。上行光信号的波长在OLT支持的上行波长范围内。
图10为本申请实施例提供的OLT的结构示意图。如图10所示，OLT 1000包括处理器1001和发射机1002。关于处理器1001的描述，可以参考前述图9中处理器902的描述。处理器1001用于生成广播信息。发射机1002用于向第一ONU传输广播信息。OLT 1000通过ODN和多个ONU相连。多个ONU包括第一ONU。广播信息包括OLT 1000支持的上行波长信息。上行波长信息用于第一ONU不启动注册，第一ONU的波长为OLT不支持的上行波长。或，上行波长信息用于第一ONU启动注册。第一ONU的波长为OLT支持的上行波长。
在其它实施例中，OLT 1000还可以包括接收机。当上行波长信息用于第一ONU启动注册时，接收机用于从第一ONU接收上行光信号。上行光信号的波长在OLT 1000支持的上行波长范围内。
应理解，关于第一ONU 900和/或OLT 1000的描述和前述图1～图6中对PON系统描述存在相似之处。因此，关于第一ONU 900和/或OLT 1000的描述，可以参考前述图1～图6任一图中的描述。例如，广播信息为PLOAM消息或下行物理帧。又如，广播信息为下行FS帧。下行FS帧中的分配标识符用于指示OLT支持的上行波长信息。又如，OLT通过ODN和多个ONU相连。多个ONU包括第一ONU和第二ONU。第一ONU从OLT接收广播信息之前，第二ONU已注册到OLT。第二ONU和OLT之间通信的上行波长为第一波长。OLT支持的上行波长不包括第一波长。
在其它实施例中，第一ONU 900和/或OLT 1000还可以包括存储器。存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、或闪存等。易失性存储器可以是随机存取存储器(random access memory，RAM)。存储器可以用于存储OLT支持的上行波长信息。
以上，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。

Claims (24)

  1. 一种接入方法，其特征在于，包括：
    第一光网络单元ONU从光线路终端OLT接收广播信息，所述OLT通过光配线网ODN和多个ONU相连，所述多个ONU包括所述第一ONU，所述广播信息包括所述OLT支持的上行波长信息；
    所述OLT支持的上行波长不包括所述第一ONU的上行波长，所述第一ONU不启动注册；或，所述OLT支持的上行波长包括所述第一ONU的上行波长，所述第一ONU启动注册。
  2. 根据权利要求1所述的接入方法，其特征在于，所述多个ONU还包括第二ONU，所述第一ONU从所述OLT接收广播信息之前，所述第二ONU已注册到所述OLT，所述第二ONU和所述OLT之间通信的上行波长为第一波长，所述第一ONU接收的所述OLT支持的上行波长不包括所述第一波长。
  3. 根据权利要求2所述的接入方法，其特征在于，所述第一波长为1260～1280纳米、1290～1310纳米或1284～1288纳米。
  4. 根据权利要求1至3中任意一项所述的接入方法，其特征在于，所述OLT支持的上行波长信息的位数等于所述OLT支持的上行波长信息所指示的波长数量。
  5. 根据权利要求4所述的接入方法，其特征在于，所述OLT支持的上行波长信息包括第一位、第二位和第三位，其中：
    所述第一位用于指示所述OLT是否支持上行波长1260～1280纳米；
    所述第二位用于指示所述OLT是否支持上行波长1290～1310纳米；
    所述第三位用于指示所述OLT是否支持上行波长1284～1288纳米。
  6. 根据权利要求5所述的接入方法，其特征在于，所述OLT支持的上行波长信息还包括第四位；
    所述第四位用于指示所述OLT是否支持上行波长1298～1302纳米。
  7. 根据权利要求1至6中任意一项所述的接入方法，其特征在于，所述广播信息为下行物理帧，所述OLT支持的上行波长信息位于所述下行物理帧的无源光网络标识字段。
  8. 根据权利要求1至6中任意一项所述的接入方法，所述广播信息为物理层操作管理和维护PLOAM消息，所述OLT支持的上行波长信息位于所述PLOAM消息中的消息内容字段。
  9. 根据权利要求8所述的接入方法，其特征在于，所述PLOAM消息为突发配置消息，所述OLT支持的上行波长信息位于所述消息内容字段中的下行无源光网络PON标识字段。
  10. 根据权利要求1至3中任意一项所述的接入方法，其特征在于，所述广播信息为下行帧起始信号FS帧，所述下行FS帧中的分配标识符用于指示所述OLT支持的上行波长信息。
  11. 一种接入方法，其特征在于，包括：
    光线路终端OLT向第一光网络单元ONU传输广播信息，所述OLT通过光配线网ODN和多个ONU相连，所述多个ONU包括所述第一ONU，所述广播信息包括所述OLT支持的上行波长信息；
    其中，所述OLT支持的上行波长不包括所述第一ONU的上行波长，所述OLT支持的上行波长信息用于所述第一ONU不启动注册；或，所述OLT支持的上行波长包括所述第一ONU的上行波长，所述OLT支持的上行波长信息用于所述第一ONU启动注册。
  12. 根据权利要求11所述的接入方法，其特征在于，所述多个ONU还包括第二ONU，所述第一ONU从所述OLT接收广播信息之前，所述第二ONU已注册到所述OLT，所述第二ONU和所述OLT之间通信的上行波长为第一波长，所述第一ONU接收的所述OLT支持的上行波长不包括所述第一波长。
  13. 根据权利要求12所述的接入方法，其特征在于，所述第一波长为1260～1280纳米、1290～1310纳米或1284～1288纳米。
  14. 根据权利要求11至13中任意一项所述的接入方法，其特征在于，所述OLT支持的上行波长信息的位数等于所述OLT支持的上行波长信息指示的波长数量。
  15. 根据权利要求14所述的接入方法，其特征在于，所述OLT支持的上行波长信息包括第一位、第二位和第三位，其中：
    所述第一位用于指示所述OLT是否支持上行波长1260～1280纳米；
    所述第二位用于指示所述OLT是否支持上行波长1290～1310纳米；
    所述第三位用于指示所述OLT是否支持上行波长1284～1288纳米。
  16. 根据权利要求15所述的接入方法，其特征在于，所述OLT支持的上行波长信息还包括第四位；
    所述第四位用于指示所述OLT是否支持上行波长1298～1302纳米。
  17. 一种无源光网络PON系统，其特征在于，包括光线路终端OLT、光配线网ODN和多个光网络单元ONU，其中：
    所述OLT通过所述ODN和所述多个ONU相连，所述多个ONU包括第一ONU；
    所述OLT用于向所述第一ONU传输广播信息，所述广播信息包括所述OLT支持的上行波长信息；
    所述OLT支持的上行波长不包括所述第一ONU的上行波长，所述第一ONU用于根据所述OLT支持的上行波长信息不启动注册；或，所述OLT支持的上行波长包括所述第一ONU的上行波长，所述第一ONU用于根据所述OLT支持的上行波长信息启动注册。
  18. 根据权利要求17所述的PON系统，其特征在于，所述多个ONU还包括第二ONU，所述第一ONU从所述OLT接收广播信息之前，所述第二ONU已注册到所述OLT，所述第二ONU和所述OLT之间通信的上行波长为第一波长，所述第一ONU接收的所述OLT支持的上行波长不包括所述第一波长。
  19. 一种第一光网络单元ONU，其特征在于，包括接收机和处理器，其中：
    所述接收机用于从光线路终端OLT接收广播信息，所述OLT通过光配线网ODN和多个ONU相连，所述多个ONU包括所述第一ONU；
    所述OLT支持的上行波长不包括所述第一ONU的上行波长，所述处理器用于根据所述OLT支持的上行波长信息不启动注册；或，所述OLT支持的上行波长包括所述第一ONU的上行波长，所述处理器用于根据所述OLT支持的上行波长信息启动注册。
  20. 根据权利要求19所述的第一ONU，其特征在于，所述多个ONU还包括第二ONU，所述第一ONU从所述OLT接收广播信息之前，所述第二ONU已注册到所述OLT，所述第二ONU和所述OLT之间通信的上行波长为第一波长，所述第一ONU接收的所述OLT支持的上行波长不包括所述第一波长。
  21. 根据权利要求19或20所述的第一ONU，其特征在于，所述第一ONU还包括发射机，其中：
    在所述处理器根据所述OLT支持的上行波长信息启动注册后，所述发射机用于向所述OLT发送上行光信号，所述上行光信号的波长在所述OLT支持的上行波长范围内。
  22. 一种光线路终端OLT，其特征在于，包括处理器和发射机，其中：
    所述处理器用于生成广播信息；
    所述发射机用于向第一光网络单元ONU传输广播信息，所述OLT通过光配线网ODN和多个ONU相连，所述多个ONU包括所述第一ONU，所述广播信息包括所述OLT支持的上行波长信息；
    其中，所述OLT支持的上行波长不包括所述第一ONU的上行波长，所述OLT支持的上行波长信息用于所述第一ONU不启动注册；或，所述OLT支持的上行波长包括所述第一ONU的上行波长，所述OLT支持的上行波长信息用于所述第一ONU启动注册。
  23. 根据权利要求22所述的OLT，其特征在于，所述多个ONU还包括第二ONU，所述第一ONU从所述OLT接收广播信息之前，所述第二ONU已注册到所述OLT，所述第二ONU和所述OLT之间通信的上行波长为第一波长，所述第一ONU接收的所述OLT支持的上行波长不包括所述第一波长。
  24. 根据权利要求22或23所述的OLT，其特征在于，所述OLT还包括接收机，其中：
    所述接收机用于从所述第一ONU接收上行光信号，所述上行光信号的波长在所述OLT支持的上行波长范围内。
PCT/CN2024/071289 2023-03-06 2024-01-09 接入方法、pon系统、第一onu和olt Ceased WO2024183451A1 (zh)

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