Access method, PON system, first ONU and OLT

Abstract

The invention provides an access method, which is applied to the field of optical communication. The access method comprises the following steps: the first ONU receives broadcast information from the OLT; and the OLT is connected with the plurality of ONUs through the ODN. The plurality of ONUs includes a first ONU. The broadcast information comprises uplink wavelength information supported by the OLT. And when the uplink wavelength supported by the OLT does not include the uplink wavelength of the first ONU, the first ONU does not start registration. And when the uplink wavelength supported by the OLT comprises the uplink wavelength of the first ONU, the first ONU starts registration. In the technical scheme provided by the invention, the uplink wavelength information supported by the current OLT port is broadcasted in the downlink direction, so that the ONU using the uplink wavelength not supported by the current OLT port can be prevented from accessing the PON system, and the reliability of optical communication is improved.

Description

[0001] This application is a divisional application. The application number of the original application is 202310246584.X, the original application date is March 6, 2023, and the entire content of the original application is incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical communication, and particularly to an access method, a passive optical network (PON) system, a first optical network unit (ONU), and an optical line termination (OLT). Background Art

[0003] The PON system includes an OLT, an optical distribution network (ODN), and multiple ONUs. The PON system can allow reception of multiple different wavelengths through wavelength division multiplexing. For example, a wavelength division multiplexing (WDM) device can be provided in the OLT. In the upstream direction, multiple ONUs are used to output multiple upstream optical signals of different wavelengths. The ODN is used to combine the multiple upstream optical signals and transmit the combined upstream optical signal to the OLT. The OLT is used to demultiplex the combined upstream optical signal through the WDM device to obtain multiple upstream optical signals. The OLT processes the multiple upstream optical signals respectively.

[0004] In practical applications, when the upstream wavelengths supported by the OLT do not include the upstream wavelength of the ONU, the OLT cannot receive the upstream optical signal normally, thereby reducing the reliability of optical communication. Summary of the Invention

[0005] This application provides an access method, a PON system, a first ONU, and an OLT. By broadcasting the upstream wavelength information supported by the current OLT port in the downstream direction, it is possible to prevent an ONU using an upstream wavelength not supported by the current OLT port from accessing the PON system, thereby improving the reliability of optical communication.

[0006] The first aspect of this application provides an access method. The access method includes the following steps: The first ONU receives broadcast information from the OLT. The OLT is connected to multiple ONUs through the ODN. The multiple ONUs include the first ONU. The broadcast information includes the upstream wavelength information 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 initiate registration. When the upstream wavelengths supported by the OLT include the upstream wavelength of the first ONU, the first ONU initiates registration.

[0007] In an alternative embodiment of the first aspect, the multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered with the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength. In this application, by broadcasting the uplink wavelength information supported by the OLT, conflicts between different ONUs can be avoided, thereby improving the reliability of optical communication.

[0008] In an alternative embodiment of the first aspect, the OLT includes a first OLT and a second OLT. The multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered with the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength. When the wavelengths of multiple uplink optical signals are the same, wavelength conflicts will occur, thereby reducing the reliability of optical communication. In this application, by broadcasting the uplink wavelength information supported by the OLT, conflicts between different ONUs can be avoided, thereby improving the reliability of optical communication.

[0009] In an alternative embodiment of the first aspect, the first wavelength is 1260 - 1280 nanometers, 1290 - 1310 nanometers, or 1284 - 1288 nanometers.

[0010] In an alternative embodiment of the first aspect, the number of bits of the uplink wavelength information supported by the OLT is equal to the number of wavelengths indicated by the uplink wavelength information. In this application, by controlling the number of bits of the uplink wavelength information, the size of the broadcast information can be reduced, thereby saving transmission resources.

[0011] In an alternative embodiment of the first aspect, the uplink 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 the uplink wavelength of 1260 - 1280 nanometers. The second bit is used to indicate whether the OLT supports the uplink wavelength of 1290 - 1310 nanometers. The third bit is used to indicate whether the OLT supports the uplink wavelength of 1284 - 1288 nanometers.

[0012] In an alternative embodiment of the first aspect, the uplink 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 the uplink wavelength of 1260 - 1280 nanometers. The second bit is used to indicate whether the OLT supports the uplink wavelength of 1290 - 1310 nanometers. The third bit is used to indicate whether the OLT supports the uplink wavelength of 1284 - 1288 nanometers. The fourth bit is used to indicate whether the OLT supports the uplink wavelength of 1298 - 1302 nanometers.

[0013] In an alternative implementation of the first aspect, the broadcast information is a downlink physical frame. The uplink wavelength information supported by the OLT is located in the passive optical network identifier (PON-ID) field of the downlink physical frame.

[0014] In an alternative implementation of the first aspect, the broadcast information is a physical layer operations administration and maintenance (PLOAM) message. The uplink wavelength information supported by the OLT is located in the message content field of the PLOAM message.

[0015] In an alternative implementation of the first aspect, the PLOAM message is a burst configuration message. The uplink wavelength information supported by the OLT is located in the downlink PON identifier field of the message content field.

[0016] In an alternative implementation of the first aspect, 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.

[0017] The second aspect of this application provides an access method. The access method includes the following steps: The OLT transmits broadcast information to the first ONU. The OLT is connected to multiple ONUs through the ODN. The multiple ONUs include the first ONU. The broadcast information includes the uplink wavelength information supported by the OLT. When the uplink wavelengths supported by the OLT do not include the uplink wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU not to initiate registration. When the uplink wavelengths supported by the OLT include the uplink wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU to initiate registration.

[0018] In an alternative implementation of the second aspect, the multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength. In an alternative implementation of the second aspect, the OLT includes a first OLT and a second OLT. The multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength.

[0019] The third aspect of this application provides a PON system. The PON system includes an OLT, an ODN, and multiple ONUs. The OLT is connected to the multiple ONUs through the ODN. The multiple ONUs include a first ONU. The OLT is used to transmit broadcast information to the first ONU. The broadcast information includes the uplink wavelength information supported by the OLT. When the uplink wavelength supported by the OLT does not include the uplink wavelength of the first ONU, the first ONU does not start the registration. When the uplink wavelength supported by the OLT includes the uplink wavelength of the first ONU, the first ONU starts the registration.

[0020] In an optional manner of the third aspect, the multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelength supported by the OLT does not include the first wavelength. In an optional manner of the third aspect, the OLT includes a first OLT and a second OLT. The multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelength supported by the OLT does not include the first wavelength.

[0021] The fourth aspect of this application provides a first ONU. The first ONU includes a receiver and a processor. The receiver is used to receive broadcast information from the OLT. The OLT is connected to the multiple ONUs through the ODN. The multiple ONUs include the first ONU. When the uplink wavelength supported by the OLT does not include the uplink wavelength of the first ONU, the processor is used to not start the registration according to the uplink wavelength information supported by the OLT. Or, when the uplink wavelength supported by the OLT includes the uplink wavelength of the first ONU, the processor is used to start the registration according to the uplink wavelength information supported by the OLT.

[0022] In an optional manner of the fourth aspect, the multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelength supported by the OLT does not include the first wavelength.

[0023] In an optional manner of the fourth aspect, the first ONU further includes a transmitter. After the processor starts the registration according to the uplink wavelength information supported by the OLT, the transmitter is used to send an uplink optical signal to the OLT. The wavelength of the uplink optical signal is within the range of the uplink wavelengths supported by the OLT.

[0024] The fifth aspect of this 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 the first ONU. The OLT is connected to multiple ONUs through an ODN. The multiple ONUs include the first ONU. The broadcast information includes the uplink wavelength information supported by the OLT. When the uplink wavelengths supported by the OLT do not include the uplink wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU not to start registration. When the uplink wavelengths supported by the OLT include the uplink wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU to start registration.

[0025] In an alternative of the fifth aspect, the multiple ONUs further include a second ONU. Before the first ONU receives the broadcast information from the OLT, the second ONU has been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength.

[0026] In an alternative of the fifth aspect, the OLT further includes a receiver. The receiver is used to receive an uplink optical signal from the first ONU. The wavelength of the uplink optical signal is within the range of the uplink wavelengths supported by the OLT.

[0027] It should be understood that the descriptions of the alternatives in the second, third, fourth, or fifth aspect have similarities with the descriptions of the alternatives in the foregoing first aspect. Therefore, the descriptions of the alternatives in the second, third, fourth, or fifth aspect can refer to the descriptions of the alternatives in the foregoing first aspect. For example, the number of bits of the uplink wavelength information supported by the OLT is equal to the number of wavelengths indicated by the uplink wavelength information. Another example is that the broadcast information is a downlink physical frame. The uplink wavelength information supported by the OLT is located in the passive optical network identification field of the downlink physical frame.

[0028] The sixth aspect of this application provides a computer storage medium, characterized in that the computer storage medium stores instructions, which, when executed on a computer, cause the computer to execute the method as described in the first aspect or any one of the implementation manners of the first aspect; or cause the computer to execute the method as described in the second aspect or any one of the implementation manners of the second aspect.

[0029] The seventh aspect of this application provides a computer program product, characterized in that the computer program product, when executed on a computer, causes the computer to execute the method as described in the first aspect or any one of the implementation manners of the first aspect; or cause the computer to execute the method as described in the second aspect or any one of the implementation manners of the second aspect. Description of the Drawings

[0030] Figure 1It is the first structural schematic diagram of the PON system provided by the embodiment of the present application;

[0031] Figure 2 It is the second structural schematic diagram of the PON system provided by the embodiment of the present application;

[0032] Figure 3 It is the third structural schematic diagram of the PON system provided by the embodiment of the present application;

[0033] Figure 4 It is the structural schematic diagram of the downstream FS frame provided by the embodiment of the present application;

[0034] Figure 5 It is the structural schematic diagram of the downstream physical frame provided by the embodiment of the present application;

[0035] Figure 6 It is the structural schematic diagram of the PLOAM message provided by the embodiment of the present application;

[0036] Figure 7 It is the first flow schematic diagram of the access method provided by the embodiment of the present application;

[0037] Figure 8 It is the second flow schematic diagram of the access method provided by the embodiment of the present application;

[0038] Figure 9 It is the structural schematic diagram of the first ONU provided by the embodiment of the present application;

[0039] Figure 10 It is the structural schematic diagram of the OLT provided by the embodiment of the present application. Detailed implementation manners

[0040] The present application provides an access method, a passive optical network (PON) system, a first optical network unit (ONU), and an optical line termination (OLT). By broadcasting the uplink wavelength information supported by the current OLT port in the downstream direction, ONUs using uplink wavelengths not supported by the current OLT port can be prevented from accessing the PON system, thereby improving the reliability of optical communication. It should be understood that the "first", "second", etc. used in the present application are only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. Additionally, for the sake of simplicity and clarity, repeated reference numerals and / or letters are used in multiple drawings of the present application. The repetition does not indicate a strict limiting relationship between various embodiments and / or configurations.

[0041] In a PON system, an OLT can allow reception of multiple different wavelengths through wavelength division multiplexing. Specifically, in the upstream direction, multiple ONUs are used to output multiple upstream optical signals of different wavelengths. The ODN is used to combine the multiple upstream optical signals and transmit the combined upstream optical signal to the OLT. The OLT is used to demultiplex the combined upstream optical signal through a wavelength division multiplexing (WDM) device to obtain multiple upstream optical signals. However, when the upstream wavelengths supported by the OLT do not include the upstream wavelength of the ONU, the OLT cannot receive the upstream optical signal normally, thereby reducing the reliability of optical communication.

[0042] For this reason, the present application provides a PON system. Figure 1 This is the first structural schematic diagram of the PON system provided by the embodiments of the present application. As Figure 1 shown, the PON system 100 includes an OLT 101, an ODN 102, and multiple ONUs. In Figure 1 the example, the multiple ONUs include ONUs 103 to 105. The OLT 101 is connected to the multiple ONUs through the ODN 102. The ODN 102 includes a splitter / combiner. In the downstream direction, the OLT 101 distributes the downstream optical signal to all ONUs through the splitter. In the upstream direction, the upstream optical signals from each optical terminal are coupled to the OLT 101 through the combiner. The OLT 101 is used to transmit broadcast information to the first ONU. The first ONU is an ONU that has not 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. When the wavelength of the transmitter of the first ONU is an upstream wavelength not supported by the OLT 101, the first ONU is used not to initiate registration according to the upstream wavelength information supported by the OLT 101. For example, the upstream wavelengths supported by the OLT 101 are wavelength 1 and wavelength 2, and the upstream wavelength not supported by the OLT 101 is wavelength 3. The wavelength of the transmitter of the first ONU is wavelength 3. 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 initiate registration according to the upstream wavelength information supported by the OLT 101. Among them, initiating registration can refer to initiating the transmitter of the first ONU or responding to the registration authorization of the OLT 101.

[0043] In the embodiment of the present application, only after the registration is started, the first ONU has the ability to transmit an upstream optical signal to the OLT 101. When 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 an upstream optical signal to the OLT 101. Therefore, the embodiment of the present application can improve the reliability of optical communication. After the first ONU starts the registration, the first ONU can send an upstream optical signal to the OLT 101 through the transmitter. The wavelength of the upstream optical signal is within the range of the upstream wavelengths supported by the OLT 101.

[0044] It should be understood that "the wavelength of the transmitter of the first ONU is the upstream wavelength supported by the OLT 101" is a necessary condition for "the first ONU starts the registration". Therefore, even if the wavelength of the transmitter of the first ONU is the upstream wavelength supported by the OLT 101, the first ONU may not start the registration.

[0045] 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 optical modules 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 simply referred to as the wavelengths supported by the OLT 101. The upstream wavelengths not supported by the OLT 101 are simply referred to as the wavelengths not supported by the OLT 101. The wavelengths not supported by the OLT 101 can be the upstream wavelengths not used by the OLT 101, or the upstream wavelengths used by the OLT 101. When the wavelength not supported by the OLT 101 is the wavelength used by the OLT 101, the upstream wavelength of the first ONU will conflict with the upstream wavelength of the second ONU in the PON system 100. For example, the upstream wavelength of the second ONU is 1290 - 1310 nanometers. The upstream wavelength of the first ONU is 1290 - 1310 nanometers. Another example is that the upstream wavelength of the second ONU is 1290 - 1310 nanometers. The upstream wavelength of the first ONU is 1298 - 1302 nanometers. Among them, the second ONU is the ONU that has been connected to the OLT 101, that is, the second ONU can transmit an upstream optical signal to the OLT 101 through the ODN 102. The communication wavelength between the second ONU and the OLT 101 is the first wavelength. Therefore, the first wavelength is the upstream wavelength used by the OLT 101.

[0046] When the first ONU is the ONU 103 in the foregoing Figure 1 the second ONU can be Figure 1The ONU 104 and / or ONU 105 therein. After the first ONU starts registration, the first ONU can access the OLT 101. The second ONU and the first ONU can access the same OLT through the ODN 102, or can access different OLTs. The following describes them separately.

[0047] Figure 2 This is the second structural schematic diagram of the PON system provided by the embodiment of the present application. As Figure 2 shown, 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 the upstream optical signal of wavelength 1. The optical module 203 is used to process the upstream optical signal of wavelength 2. At this time, 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 upstream 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 upstream optical signal of the first ONU. In Figure 2 this case, the second ONU and the first ONU are connected to the same OLT through the ODN 102.

[0048] Figure 3 This is the third structural schematic diagram of the PON system provided by the embodiment of the present application. As Figure 3 shown, 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 the upstream optical signal of wavelength 1. The second OLT 302 is used to process the upstream optical signal of wavelength 2. At this time, 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 upstream optical signal of the first ONU will enter the second OLT 302 after passing through the ODN 102 and the WDM 201. The second OLT 302 is used to process the upstream optical signal of the first ONU. In Figure 3In this case, the second ONU and the first ONU are connected to different OLTs through the ODN 102.

[0049] In the embodiment of the present application, the wavelengths used by the OLT 101 can 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. Among them, 1260 - 1280 nanometers, 1284 - 1288 nanometers, 1290 - 1310 nanometers, and 1298 - 1302 nanometers respectively represent one wavelength. 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 can be any one of the 3 wavelengths or 4 wavelengths.

[0050] In the foregoing Figures 1 - 3 example, the PON system 100 can be a 50G-PON (50-gigabit-capable passive optical network, 50G-GPON) system. The uplink wavelength used by the OLT 101 can be the foregoing 3 wavelengths or 4 wavelengths. The PON system 100 can also be a combination of a 50G-PON system and a GPON (gigabit PON) system. At this time, the wavelengths not supported by the OLT 101 are 1290 - 1310 nanometers and 1298 - 1302 nanometers. The wavelengths supported by the OLT 101 can be the wavelengths among the foregoing 3 wavelengths or 4 wavelengths except 1290 - 1310 nanometers and 1298 - 1302 nanometers. The PON system 100 can also be a combination of a 50G-PON system and an XG-PON (10-gigabit-capable passive optical network, 10G-GPON) system. At this time, the wavelength not supported by the OLT 101 can be 1260 - 1280 nanometers. The wavelengths supported by the OLT 101 can be the wavelengths among the foregoing 3 wavelengths or 4 wavelengths except 1260 - 1280 nanometers. The PON system 100 can also be a combination of a 50G-PON system, an XG-PON system, and a GPON system. At this time, the wavelengths not supported by the OLT 101 can be 1260 - 1280 nanometers, 1290 - 1310 nanometers, and 1298 - 1302 nanometers. The wavelength supported by the OLT 101 is 1284 - 1288 nanometers.

[0051] It should be understood that the OLT 101 can send broadcast information on a certain channel. At this time, the ONUs outside a certain channel cannot receive the broadcast information. For example, the PON system 100 includes a 50G-GPON channel and a 10G-GPON channel. The OLT 101 sends broadcast information on the 50G-GPON channel. Since the downstream wavelengths of the 50G-GPON channel and the 10G-GPON channel are not the same, the filters of the ONUs belonging to the 10G-GPON channel cannot correctly obtain the broadcast information, that is, the ONUs of the 10G-GPON channel cannot receive the broadcast information. In the embodiments of the present application, 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. According to the foregoing description, the broadcast information includes the upstream wavelength information supported by the OLT 101 (referred to as the upstream wavelength information for short). The broadcast information may be a downstream frame start signal (FS) frame. The allocation identifier in the downstream FS frame is used to indicate the upstream wavelength information. The following describes this.

[0052] Figure 4 FIG. is a schematic structural diagram of a downstream FS frame provided by an embodiment of the present application. As Figure 4 shown, the downstream FS frame is composed of a downstream FS frame header field and an FS payload field. The downstream 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 downstream physical layer operations administration and maintenance (PLOAMd) field. The 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 bit 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. Among them, the value of the Alloc-ID is a 14-digit number, which is used to identify the recipient of the corresponding upstream bandwidth allocation: a specific service-bearing entity within a specific ONU, or a specific contention-based function that can be used by multiple eligible ONUs. The Alloc-ID can be divided into directed (associated with a unique ONU) and broadcast. Table 1 is a functional description of the Alloc-ID.

[0053]

[0054] Table 1

[0055] In Table 1, ρ0 refers to the basic line rate, with the unit of gigabit per second (Gbit / s). Φ0, Φ1, and Φ2 refer to different line rate coefficients. In the embodiments of the present application, the uplink wavelength information supported by the OLT 101 can be indicated by the value of Alloc-ID. The following describes an example where the uplink wavelengths used by the OLT 101 include 3 wavelengths. The 3 wavelengths include Wavelength 1, Wavelength 2, and Wavelength 3. The 3 wavelengths can be divided into the wavelengths supported by the OLT 101 and the wavelengths not supported by the OLT 101. There are 8 ways to allocate the 3 wavelengths. Table 2 is an example combination of the allocation methods of the 3 wavelengths.

[0056]

[0057]

[0058] Table 2

[0059] The OLT 101 can establish the corresponding relationship between Table 2 and the Alloc-ID in the aforementioned Table 1. For example, Table 3 is the function description of the modified Alloc-ID.

[0060]

[0061] Table 3

[0062] In Table 3, the OLT 101 has established the corresponding relationship between the value 1024 of Alloc-ID and the uplink line rate ρ0Φ0, the wavelength supported by the OLT 101 (Wavelength 1), and the wavelengths not supported by the OLT 101 (Wavelength 2 and Wavelength 3). Similarly, the OLT 101 can also establish the corresponding relationship between Alloc-ID and the uplink line rate ρ0Φ0 and other supported wavelengths. Table 4 is an example of the corresponding relationship provided by the embodiments of the present application.

[0063] Number of lines Alloc-ID Upstream line rate Supported wavelengths Unsupported wavelengths 1 1020 ρ0Φ0 None Wavelength 1, Wavelength 2, and Wavelength 3 2 1024 ρ0Φ0 Wavelength 1 Wavelength 2 and Wavelength 3 3 1028 ρ0Φ0 Wavelength 2 Wavelength 1 and Wavelength 3 4 1032 ρ0Φ0 Wavelength 3 Wavelength 1 and Wavelength 2 5 1036 ρ0Φ0 Wavelength 1 and Wavelength 2 Wavelength 3 6 1040 ρ0Φ0 Wavelength 1 and Wavelength 3 Wavelength 2 7 1044 ρ0Φ0 Wavelength 2 and Wavelength 3 Wavelength 1 8 1048 ρ0Φ0 Wavelength 1, Wavelength 2, and Wavelength 3 None

[0064] Table 4

[0065] When the first ONU receives the downstream authorization structure with an Alloc-ID of 1020, it indicates that OLT 101 does not support the wavelength. At this time, the first ONU does not initiate registration. When the first ONU receives the downstream FS frame with an 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 initiate registration, with the upstream line rate being ρ0Φ0, and use 1024 to transmit the serial 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 initiate registration. For the descriptions of other Alloc-IDs in Table 4, the descriptions of 1020 and 1024 can be referred to. Therefore, in the embodiments of the present application, the upstream wavelength information supported by OLT 101 can be indicated by the Alloc-ID.

[0066] In the aforementioned Table 3, OLT also established the correspondence between the value 1025 of the Alloc-ID, the upstream line rate ρ0Φ1, 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 the correspondence between the Alloc-ID, the upstream line rate ρ0Φ1, and other supported wavelengths. Table 5 is an example of the correspondence provided by the embodiments of the present application.

[0067] Number of lines Alloc-ID Upstream line rate Supported wavelengths Unsupported wavelengths 1 1021 ρ0Φ1 None Wavelength 1, Wavelength 2, and Wavelength 3 2 1025 ρ0Φ1 Wavelength 1 Wavelength 2 and Wavelength 3 3 1029 ρ0Φ1 Wavelength 2 Wavelength 1 and Wavelength 3 4 1033 ρ0Φ1 Wavelength 3 Wavelength 1 and Wavelength 2 5 1037 ρ0Φ1 Wavelength 1 and Wavelength 2 Wavelength 3 6 1041 ρ0Φ1 Wavelength 1 and Wavelength 3 Wavelength 2 7 1045 ρ0Φ1 Wavelength 2 and Wavelength 3 Wavelength 1 8 1049 ρ0Φ1 Wavelength 1, Wavelength 2, and Wavelength 3 None

[0068] Table 5

[0069] In the aforementioned Table 3, OLT 101 also established the correspondence between the value 1026 of the Alloc-ID, the upstream line rate ρ0Φ2, 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 the correspondence between the Alloc-ID, the upstream line rate ρ0Φ2, and other supported wavelengths. Table 6 is an example of the correspondence provided by the embodiments of the present application.

[0070] Number of lines Alloc-ID Upstream line rate Supported wavelengths Unsupported wavelengths 1 1022 ρ0Φ2 None Wavelength 1, Wavelength 2, and Wavelength 3 2 1026 ρ0Φ2 Wavelength 1 Wavelength 2 and Wavelength 3 3 1030 ρ0Φ2 Wavelength 2 Wavelength 1 and Wavelength 3 4 1034 ρ0Φ2 Wavelength 3 Wavelength 1 and Wavelength 2 5 1038 ρ0Φ2 Wavelength 1 and Wavelength 2 Wavelength 3 6 1042 ρ0Φ2 Wavelength 1 and Wavelength 3 Wavelength 2 7 1046 ρ0Φ2 Wavelength 2 and Wavelength 3 Wavelength 1 8 1050 ρ0Φ2 Wavelength 1, Wavelength 2, and Wavelength 3 None

[0071] Table 6

[0072] In the foregoing Table 3, the OLT 101 also establishes the correspondence between the value 1027 of the Alloc-ID and the upstream line rate (ρ0Φ0, ρ0Φ1 or ρ0Φ2), the wavelength supported by the OLT (wavelength 1), and the wavelengths not supported by the OLT (wavelengths 2 and 3). Similarly, the OLT 101 can also establish the correspondence between the Alloc-ID and the upstream line rate (ρ0Φ0, ρ0Φ1 or ρ0Φ2), and other supported wavelengths. Table 7 is an example of the correspondence provided by the embodiments of the present application.

[0073]

[0074] Table 7

[0075] It should be understood that the foregoing Tables 3 to 7 are only an example of indicating the upstream wavelength information through the Alloc-ID provided by the embodiments of the present application. In practical applications, those skilled in the art can define other specific Alloc-IDs to indicate the upstream wavelength information. For example, the OLT 101 replaces 1020, 1024, 1028... 1044 and 1048 in Table 4 with Alloc-IDs 1020 to 1027. The OLT 101 replaces 1021, 1025, 1029... 1045 and 1049 in Table 5 with Alloc-IDs 1028 to 1035. The OLT 101 replaces 1022, 1026, 1030... 1046 and 1050 in Table 6 with Alloc-IDs 1036 to 1043. The OLT 101 replaces 1023, 1027, 1031... 1047 and 1051 in Table 7 with Alloc-IDs 1044 to 1051.

[0076] It should be understood that in the examples of the foregoing Tables 3 to 7, the present application describes by taking the upstream wavelengths used by the OLT 101 including 3 wavelengths as an example. The OLT 101 indicates the upstream wavelength information and the upstream line rate through 8×4 Alloc-IDs. In practical applications, the number of upstream wavelengths used by the OLT can be other values. For example, the upstream wavelengths used by the OLT include 4 wavelengths. The 4 wavelengths can be allocated as supported wavelengths and unsupported wavelengths. There are 16 ways to allocate the 4 wavelengths. At this time, the OLT can indicate the upstream wavelength information and the upstream line rate through 16×4 Alloc-IDs.

[0077] According to the foregoing description, the broadcast information can be a downstream FS frame. In practical applications, the broadcast information can also be a downstream physical frame or a physical layer operations administration and maintenance (PLOAM) message, which will be described separately below.

[0078] The downlink physical frame is also referred to as the downlink PHY frame. Figure 5 It is a schematic diagram of the structure of the downlink physical frame provided by the embodiments of the present application. As Figure 5 shown, 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 superframe 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. Among them, the R field is a reserved field. The value in the C field is the transmitted optical power reference point indicator. The value in the TOL field can indicate the transmitted power from the current OLT CT transceiver to the ODN or the transmitted power reaching the extender transceiver. The PON-ID field includes an administrative label field and a downlink wavelength channel identifier (DWLCH ID) field. The size of the DWLCH ID field is 4 bits. The uplink wavelength information can be located in the DWLCH ID field.

[0079] Figure 6 It is a schematic diagram of the structure of the PLOAM message provided by the embodiments of the present application. As Figure 6 shown, the 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 VIII shows the size and function description of each field in the PLOAM message 601.

[0080]

[0081] Table VIII

[0082] The uplink wavelength information can be located in the message content field. At this time, 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 can be located in the fifth byte of the PLOAM message 601. When the bit size of the uplink wavelength information is 4 bits, the uplink wavelength information can be located in the last 4 bits of the fifth byte. At this time, the 8 bits in the fifth byte can be represented as 0000ABCD. "0" represents bit 0. For the description of ABCD, reference can be made to the subsequent description.

[0083] The PLOAM message 601 can be a burst configuration (burst_profile) message. The message content field in the burst_profile message includes a burst configuration control 1 field, a burst configuration control 2 field, a delimiter control field, a delimiter pattern field, a preamble descriptor field, a preamble word count field, a preamble pattern field, a PON-TAG field, a downstream PON identification field, an ONURssiMin field, and an ONURssiMax field. Among them, 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 of the burst_profile message. The content in the downstream PON-ID field is only valid for time-division and wavelength-division multiplexing (TWDM) PONs and has no meaning for time-division multiplexing (TDM) PONs. Therefore, the uplink wavelength information can be carried through the downstream PON identification field. For example, the uplink wavelength information can be located in the first byte of the downstream PON identification field. When the bit size of the uplink wavelength information is 4 bits, the uplink wavelength information can be located in the last 4 bits of the first byte. At this time, the 8 bits in the first byte can be represented as 0000ABCD. "0" represents bit 0. For the description of ABCD, reference can be made to the subsequent description.

[0084] In practical applications, the number of bits of the upstream wavelength information supported by the OLT can be equal to the number of wavelengths indicated by the upstream wavelength information. For example, the upstream wavelengths used by 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 each represent a bit. At this time, the upstream wavelength information includes 3 bits, that is, the number of bits of the upstream wavelength information is 3. The 3 wavelengths and the 3 bits correspond 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. Similarly, for the descriptions of B and C, reference can be made to the description of A.

[0085] The 3 wavelengths can be 1260 - 1280 nm, 1284 - 1288 nm, and 1290 - 1310 nm. Wavelength 1 can be any one of the 3 wavelengths. Wavelength 2 can be any one of the 3 wavelengths other than Wavelength 1. Wavelength 3 is the wavelength among the 3 wavelengths other than Wavelength 1 and Wavelength 2. For example, Wavelength 1 is 1260 - 1280 nm. Wavelength 2 is 1284 - 1288 nm. Wavelength 3 is 1290 - 1310 nm. Another example is that Wavelength 1 is 1260 - 1280 nm. Wavelength 2 is 1290 - 1310 nm. Wavelength 3 is 1284 - 1288 nm.

[0086] In practical applications, the upstream wavelengths used by OLT 101 can 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 each represent a bit. At this time, the upstream wavelength information includes 4 bits, that is, the number of bits of the upstream wavelength information is 4. The 4 wavelengths and the 4 bits correspond 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 the OLT 101 supports the corresponding wavelength.

[0087] The four wavelengths can be 1260 - 1280 nm, 1284 - 1288 nm, 1290 - 1310 nm, and 1298 - 1302 nm. Wavelength 1 can be any one of the four wavelengths. Wavelength 2 is any one of the four wavelengths other than Wavelength 1. Wavelength 3 is any one of the four wavelengths other than Wavelength 1 and Wavelength 2. Wavelength 4 is the wavelength among the four wavelengths other than Wavelength 1, Wavelength 2, and Wavelength 3. For example, Wavelength 1 is 1260 - 1280 nm. Wavelength 2 is 1284 - 1288 nm. Wavelength 3 is 1290 - 1310 nm. Wavelength 4 is 1298 - 1302 nm. Another example, Wavelength 1 is 1260 - 1280 nm. Wavelength 2 is 1290 - 1310 nm. Wavelength 3 is 1284 - 1288 nm. Wavelength 4 is 1298 - 1302 nm.

[0088] The PON system provided by the present application was described above. Next, the access method provided by the present application will be described. Figure 7 This is the first process schematic diagram of the access method provided by the embodiments of the present application. As Figure 7 shown, the access method includes the following steps.

[0089] In step 701, the first ONU receives broadcast information from the OLT, and the broadcast information includes the uplink wavelength information supported by the OLT.

[0090] In step 702, if the uplink wavelength supported by the OLT does not include the wavelength of the first ONU, the first ONU does not initiate registration according to the uplink wavelength information supported by the OLT; or, if the uplink wavelength supported by the OLT includes the wavelength of the first ONU, the first ONU initiates registration according to the uplink wavelength information supported by the OLT.

[0091] When the uplink wavelength supported by the OLT does not include the wavelength of the transmitter of the first ONU, the first ONU is used to not initiate registration according to the uplink wavelength information supported by the OLT. For example, the uplink wavelengths supported by the OLT are Wavelength 1 and Wavelength 2, and the uplink wavelength not supported by OLT 101 is Wavelength 3. The wavelength of the transmitter of the first ONU is Wavelength 3. When the uplink wavelength supported by the OLT includes the wavelength of the transmitter of the first ONU, the first ONU is used to initiate registration according to the uplink wavelength information supported by the OLT.

[0092] Figure 8 This is the second process schematic diagram of the access method provided by the embodiments of the present application. As Figure 8 shown, the access method includes the following steps.

[0093] In step 801, the OLT transmits broadcast information to the first ONU. The broadcast information includes the uplink wavelength information supported by the OLT. The uplink wavelengths supported by the OLT do not include the wavelength of the first ONU. The uplink wavelength information supported by the OLT is used for the first ONU not to initiate registration; or, the uplink wavelengths supported by the OLT include the wavelength of the first ONU, and the uplink wavelength information supported by the OLT is used for the first ONU to initiate registration.

[0094] When the uplink wavelengths supported by the OLT do not include the wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU not to initiate registration. When the uplink wavelengths supported by the OLT include the wavelength of the first ONU, the uplink wavelength information supported by the OLT is used for the first ONU to initiate registration.

[0095] It should be understood that there are similarities between the description of the access method and the description of the PON system in the foregoing Figures 1 - 6 Therefore, for the description of the access method, reference can be made to the description in any of the foregoing Figures 1 - 6 figures. For example, the broadcast information is a PLOAM message or a downstream physical frame. Another example is that the broadcast information is a downstream FS frame. The allocation identifier in the downstream FS frame is used to indicate the uplink wavelength information supported by the OLT. Another example is that 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 been registered to the OLT. The uplink wavelength for communication between the second ONU and the OLT is the first wavelength. The uplink wavelengths supported by the OLT do not include the first wavelength.

[0096] The access method provided by the present application is described above. Next, the first ONU provided by the present application will be described. Figure 9 This is the schematic structural diagram of the first ONU provided by the embodiments of the present application. As Figure 9As shown in the figure, the first ONU 900 includes a receiver 901 and a processor 902. The receiver 901 is used to receive broadcast information from the OLT. The OLT is connected to multiple ONUs through the ODN. The multiple ONUs include the first ONU. The processor 902 can be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor 902 can further include a hardware chip or other general-purpose processors. The above-mentioned hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The processor 902 is used not to initiate registration according to the upstream wavelength information. The wavelength of the first ONU 900 is an upstream wavelength not supported by the OLT. Or, the processor 902 is used to initiate registration according to the upstream wavelength information. The wavelength of the first ONU 900 is an upstream wavelength supported by the OLT.

[0097] In other embodiments, the first ONU 900 may further include a transmitter. After the processor 902 initiates 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 range of the upstream wavelengths supported by the OLT.

[0098] Figure 10 This is a schematic structural diagram of the OLT provided by the embodiment of the present application. As Figure 10 shown in the figure, the OLT 1000 includes a processor 1001 and a transmitter 1002. For the description of the processor 1001, reference can be made to the description of the processor 902 in the foregoing Figure 9 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 multiple ONUs through the ODN. The multiple ONUs include the first ONU. The broadcast information includes the upstream wavelength information supported by the OLT 1000. The upstream wavelength information is used for the first ONU not to initiate registration, and the wavelength of the first ONU is an upstream wavelength not supported by the OLT. Or, the upstream wavelength information is used for the first ONU to initiate registration. The wavelength of the first ONU is an upstream wavelength supported by the OLT.

[0099] In other embodiments, the OLT 1000 may further include a receiver. When the upstream wavelength information is used for the first ONU to initiate registration, the receiver is used to receive the upstream optical signal from the first ONU. The wavelength of the upstream optical signal is within the range of the upstream wavelengths supported by the OLT 1000.

[0100] It should be understood that there are similarities in the descriptions of the first ONU 900 and / or the OLT 1000 and the description of the PON system in the foregoing Figures 1 - 6 Therefore, for the description of the first ONU 900 and / or the OLT 1000, reference may be made to the description in any of the foregoing Figures 1 - 6 figures. For example, the broadcast information is a PLOAM message or a downstream physical frame. Another example is that 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. Another example is that the OLT is connected to multiple ONUs through the 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 been 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.

[0101] In other embodiments, 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. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (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.

[0102] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application.

Claims

1. An access method, characterized in that, Including: A first optical network unit (ONU) receives a downstream physical frame or a physical layer operation, administration, and maintenance (PLOAM) message from an optical line terminal (OLT). The downstream physical frame or the PLOAM message includes upstream wavelength indication information, and the upstream wavelength indication information indicates at least one upstream wavelength option.

2. The access method according to claim 1, wherein The upstream wavelength indication information includes a first upstream wavelength option, a second upstream wavelength option, and a third upstream wavelength option; The first upstream wavelength option is used to indicate whether the upstream wavelength range of 1260 - 1280 nanometers is supported; The second upstream wavelength option is used to indicate whether the upstream wavelength range of 1290 - 1310 nanometers is supported; The third upstream wavelength option is used to indicate whether the upstream wavelength range of 1284 - 1288 nanometers is supported.

3. The access method according to claim 1 or 2, characterized in that The access method is applied to a time-division multiplexing passive optical network (TDM PON).

4. The access method according to any one of claims 1 to 3, characterized in that The method further includes: If the first ONU supports at least one of the upstream wavelength options, the first ONU continues to register.

5. The access method according to any one of claims 1 to 4, characterized in that The method further includes: If the first ONU does not support the upstream wavelength options, the first ONU stops registering.

6. The access method according to any one of claims 1 to 5, characterized in that The upstream wavelength indication information is located in the passive optical network identification field of the downstream physical frame.

7. The access method according to claim 6, wherein The upstream wavelength indication information is located in the downstream wavelength channel identification (DWLCH ID) field of the passive optical network identification field.

8. The access method according to claim 7, characterized in that The upstream wavelength indication information is represented by three bits in the DWLCH ID field, with one bit corresponding to one upstream wavelength option.

9. The access method according to any one of claims 1 to 5, wherein the PLOAM message is a burst configuration message, and the upstream wavelength indication information is located in the downstream passive optical network (PON) identification field of the burst configuration message.

10. The access method according to claim 9, characterized in that The upstream wavelength indication information is represented by three bits in the downstream passive optical network (PON) identification field, with one bit corresponding to one upstream wavelength option.

11. An access method, characterized in that, Including: An optical line terminal (OLT) sends a downstream physical frame or a physical layer operation, administration, and maintenance (PLOAM) message. The downstream physical frame or the PLOAM message includes upstream wavelength indication information, and the upstream wavelength indication information indicates at least one upstream wavelength option.

12. The access method according to claim 11, wherein The upstream wavelength indication information includes a first upstream wavelength option, a second upstream wavelength option, and a third upstream wavelength option; The first upstream wavelength option is used to indicate whether the upstream wavelength range of 1260 - 1280 nanometers is supported; The second upstream wavelength option is used to indicate whether the upstream wavelength range of 1290 - 1310 nanometers is supported; The third upstream wavelength option is used to indicate whether the upstream wavelength range of 1284 - 1288 nanometers is supported.

13. The access method according to claim 11 or 12, characterized in that, The access method is applied to a time-division multiplexing passive optical network (TDM PON).

14. The access method according to any one of claims 11 to 13, characterized in that, The upstream wavelength option is used to trigger the first ONU to continue registering when the first ONU supports the upstream wavelength option.

15. The access method according to any one of claims 11 to 14, characterized in that, The upstream wavelength option is used to trigger the first ONU to stop registering when the first ONU does not support the upstream wavelength option.

16. The access method according to any one of claims 11 to 15, characterized in that, The upstream wavelength indication information is located in the passive optical network identification field of the downstream physical frame.

17. The access method according to claim 16, wherein The uplink wavelength indication information is located in the downlink wavelength channel identification DWLCH ID field of the passive optical network identification field.

18. The access method according to claim 17, wherein The uplink wavelength indication information is represented by three bits in the DWLCH ID field, with one bit corresponding to one uplink wavelength option.

19. The access method according to any one of claims 11 to 15, wherein the PLOAM message is a burst configuration message, and the uplink wavelength indication information is located in the downlink passive optical network PON identification field of the burst configuration message.

20. The access method according to claim 19, wherein The uplink wavelength indication information is represented by three bits in the downlink passive optical network PON identification field, with one bit corresponding to one uplink wavelength option.

21. The access method according to claim 14 or 15, characterized in that, The TDM PON further includes a second ONU, which is an ONU that is registered to the OLT prior to the first ONU. The uplink wavelength for the second ONU to communicate with the OLT is the first wavelength, and the uplink wavelength options indicated by the uplink wavelength indication information in the downlink physical frame or PLOAM message do not include the first wavelength.

22. The access method according to claim 21, wherein The first wavelength is 1260 - 1280 nanometers, 1290 - 1310 nanometers, or 1284 - 1288 nanometers.

23. A communication device, characterized in that, Comprising: A processor and a memory; wherein, the memory stores a computer program; The processor calls the computer program to cause the communication device to execute the method according to any one of claims 1 to 10.

24. A communication device, characterized in that, Comprising: A processor and a memory; wherein, the memory stores a computer program; The processor calls the computer program to cause the communication device to execute the method according to any one of claims 11 to 22.

25. A communication system, characterized in that, Comprising: The communication device according to claim 23, and the communication device according to claim 24.

26. A device, characterized in that, The device is used to execute the method according to any one of claims 1 to 10; or, execute the method according to any one of claims 11 to 22.

27. A computer-readable storage medium, characterized in that, A computer program is stored, and the computer program can be executed by a processor to cause a computer to execute the method according to any one of claims 1 to 22.

28. A computer program product, characterized in that, Comprising computer program instructions, when the computer program instructions run on a computer, causing the computer to execute the method according to any one of claims 1 to 22.

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