Optical network transmission apparatus and method, optical network system

Abstract

The application provides an optical network transmission device and method and an optical network system. The optical network transmission device comprises a plurality of first multiplexers and demultiplexers, a first port of the first multiplexer is connected with a first type passive optical network (PON) system optical line terminal (OLT) port, a second port of the first multiplexer is connected with at least one optical distribution network (ODN), the ODN is provided with a first type PON system optical network unit (ONU) and a second type PON system ONU; and the optical distribution module is used for branching and combining processing of optical signals, and comprises a common port and a plurality of branch ports, the common port of the optical distribution module is connected with a second type PON system OLT port in signal, and the plurality of branch ports of the optical distribution module are respectively connected with a third port of one of the plurality of first multiplexers in signal.

Description

Technical Field

[0001] This application relates to the field of optical network technology, and in particular to an optical network transmission device and method, and an optical network system. Background Technology

[0002] Passive Optical Network (PON) systems have undergone three generations of development. The first generation includes Gigabit-Capable Passive Optical Network (GPON) and Ethernet Passive Optical Network (EPON); the second generation includes 10G EPON and XG(S)-PON; and the third generation includes 50GPON systems. When upgrading from the previous generation to the next generation, existing PON optical modules and line cards are typically replaced with new-generation Combo PON optical modules and line cards to support users in the existing ODN to gradually upgrade to the new PON standard. Alternatively, new standard PON line cards and PON optical modules can be added and multiplexed with existing PON line cards and PON optical modules into a single ODN using an external wavelength division multiplexing (WDM1r) multiplexing device.

[0003] For 50G-PON systems, Combo PON optical modules need to integrate optical transceivers for three standards: Type I Gigabit Passive Optical Network (GPON), Symmetric 10G Passive Optical Network (XGS PON), and 50G-PON, as well as integrated three-transmit, three-receive WDM. In the early stages of 50G-PON deployment, the cost of tri-mode Combo 50G-PON optical modules is high. Continuing to use the existing Combo PON evolution scheme results in high costs and low bandwidth utilization of 50G-PON ports. Simultaneously, existing XGS Combo optical modules and equipment need to be decommissioned, leading to resource waste. External WDM1r multiplexing solutions, on the other hand, have a 1:1 port ratio between 50G-PON, XGS PON, and GPON ports and the ODN, meaning one 50G-PON port only supports upgrades for user terminals within one ODN. This cannot solve the problems of low bandwidth utilization and high initial deployment costs associated with 50G-PON ports. Summary of the Invention

[0004] The main objective of this application is to provide an optical network transmission device and method, and an optical network system.

[0005] In a first aspect, embodiments of this application provide an optical network transmission device, comprising:

[0006] Multiple first multiplexers and splitters are provided. The first port of the first multiplexer and splitter is connected to the port of the optical line terminal (OLT) of the first type of passive optical network (PON). The second port of the first multiplexer and splitter is connected to at least one optical distribution network (ODN). The ODN is provided with a first type of PON optical network unit (ONU) and a second type of PON ONU.

[0007] An optical distribution module is used to split / combine optical signals. It includes a common port and multiple branch ports. The common port of the optical distribution module is connected to a Type II PON OLT port. The multiple branch ports of the optical distribution module are respectively connected to the third port signal of one of the multiple first multiplexers / demultiplexers.

[0008] Secondly, embodiments of this application provide an optical network transmission method, applied to any one of the optical network transmission devices described in the embodiments of this disclosure, the method comprising:

[0009] The system receives downlink optical signals of type 1 PON from at least one type 1 PON OLT port and transmits them to at least one type 1 PON ONU in an optical distribution network (ODN). It also receives uplink optical signals of type 1 PON from the at least one type 1 PON ONU in the ODN and transmits them to the corresponding type 1 PON OLT port.

[0010] And / or, receive a Type II PON downlink optical signal sent by a Type II PON OLT port, split and transmit it to a Type II PON ONU in the at least one ODN; receive a Type II PON uplink optical signal sent by a Type II PON ONU in the at least one ODN, and combine and output it to a Type II PON OLT port.

[0011] Thirdly, embodiments of this application provide an optical network system, including:

[0012] Multiple Type I Passive Optical Network (PON) optical line terminals (OLTs);

[0013] A Type II PON OLT;

[0014] Multiple optical distribution networks (ODNs);

[0015] An optical network transmission device, wherein a first end of the optical network transmission device is connected to a first type PON standard OLT signal via a first type PON standard OLT port, and is connected to a second type PON standard OLT signal via a second type PON standard OLT port; a second end of the optical network transmission device is connected to a first end signal of the plurality of ODN networks; the optical network transmission device includes any one of the optical network transmission devices provided in the embodiments of this disclosure.

[0016] The optical network transmission apparatus and method, and optical network system provided in this disclosure, have a first port of a first multiplexer / demultiplexer connected to a Type I Passive Optical Network (PON) OLT port, and a second port of the first multiplexer / demultiplexer connected to at least one Optical Distribution Network (ODN). An optical distribution module is used to split / multiplex optical signals, and its common port is connected to a Type II PON OLT port. Multiple branch ports of the optical distribution module are respectively connected to the third port of one of the multiple first multiplexers / demultiplexers. That is, after passing through the optical distribution module and multiplexers / demultiplexers, the Type II PON OLT port shares a single ODN port with multiple Type I PON OLT ports, reducing the number of ports in the optical network transmission apparatus and lowering the initial deployment cost of the optical network. The PON-compliant OLT port can interact with both Type I and Type II PON ONUs in the ODN via a first multiplexer / splitter. The Type II PON-compliant OLT port can also interact with both Type I and Type II PON ONUs in the ODN via an optical distribution module and the first multiplexer / splitter. Therefore, a single Type II PON-compliant OLT port can support the upgrade of multiple Type I PON-compliant ONUs in the ODN network. This allows the Type II PON-compliant OLT port to interact with both Type I and Type II PON-compliant ONUs in the ODN, improving the utilization of the Type II PON-compliant OLT port (50G-PON port) and bandwidth, and reducing the initial deployment cost of Type II PON-compliant equipment. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown.

[0018] Figure 2 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown.

[0019] Figure 3 A schematic diagram of the structure of a second type of photoelectric regeneration module provided in an embodiment of this disclosure is shown.

[0020] Figure 4A schematic diagram of another type of photoelectric regeneration module provided in an embodiment of this disclosure is shown.

[0021] Figure 5 A schematic diagram of the structure of another type of second-class photoelectric regeneration module provided in an embodiment of this disclosure is shown.

[0022] Figure 6 A schematic diagram of the structure of another type of second-class photoelectric regeneration module provided in this disclosure embodiment is shown.

[0023] Figure 7 A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown.

[0024] Figure 8 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown.

[0025] Figure 9 A schematic diagram of the structure of another optical network transmission device provided in an embodiment of this disclosure is shown.

[0026] Figure 10 A schematic diagram of the structure of a third photoelectric regeneration module provided in an embodiment of this disclosure is shown.

[0027] Figure 11 A schematic diagram of another third photoelectric regeneration module provided in an embodiment of this disclosure is shown.

[0028] Figure 12 A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown.

[0029] Figure 13 A partial structural schematic diagram of an optical network transmission device provided in an embodiment of this disclosure is shown.

[0030] Figure 14 A partial structural schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown.

[0031] Figure 15 A partial structural schematic diagram of another optical network transmission device provided in an embodiment of the present disclosure is shown.

[0032] Figure 16 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown.

[0033] Figure 17 A flowchart of an optical network transmission method provided by an embodiment of this disclosure is shown.

[0034] Figure 18 A schematic diagram of the structure of an optical network system provided in an embodiment of this disclosure is shown.

[0035] Figure 19 A schematic diagram of another optical network system provided in an embodiment of this disclosure is shown.

[0036] Figure 20 A schematic diagram of the structure of another optical network system provided in an embodiment of the present disclosure is shown. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of this application, the server provided in this application will be described in detail below with reference to the accompanying drawings.

[0038] Exemplary embodiments will be described more fully below with reference to the accompanying drawings; however, these exemplary embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this application.

[0039] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used herein, the singular forms “a” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated features, integrals, steps, operations, elements, and / or components is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded.

[0041] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this application, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined herein.

[0042] In a first aspect, the present disclosure provides an optical network transmission device that is applied to a multi-generational passive optical network system and can be applied to the optical line terminal (OLT) side or the optical distribution network (ODN).

[0043] Figure 1 A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown. Figure 1As shown, the optical network transmission device includes multiple first multiplexers / demultiplexers 100 and an optical distribution module 200. The first multiplexers / demultiplexers 100 are used to perform multiplexing / demultiplexing processing on optical signals, and the optical distribution module 200 is used to perform splitting / combining processing on optical signals.

[0044] The first port of the first multiplexer / splitter 100 is connected to the port of the first type of passive optical network (PON) standard OLT, and the second port of the first multiplexer / splitter 100 is connected to at least one optical distribution network (ODN). The ODN is equipped with a first type of PON standard optical network unit (ONU) and a second type of PON standard ONU.

[0045] When the optical network transmission device is connected to n Type I PON standard OLT ports, n first multiplexers / demultiplexers 100 are set in the optical network transmission device. Each Type I PON standard OLT port corresponds to one first multiplexer / demultiplexer 100, and the Type I PON standard OLT port is connected to the first port of the first multiplexer / demultiplexer 100. Here, n is an integer greater than 1.

[0046] In this embodiment, each first multiplexer / demultiplexer 100 can be connected to an ODN. For any given ODN, both Type I PON ONUs and Type II PON ONUs can coexist.

[0047] The optical distribution module 200 is used to split / combine optical signals. It includes a common port and multiple branch ports. The common port of the optical distribution module 200 is connected to a Type II PON OLT port. The multiple branch ports of the optical distribution module 200 are respectively connected to the third port of one of the multiple first multiplexers / demultiplexers 100.

[0048] It should be noted that, in this embodiment, the first type of PON standard OLT port and ONU refers to the PON standard OLT port and ONU already deployed in the existing network, while the second type of PON standard OLT port and ONU refers to the newly deployed PON standard OLT port and ONU. The first type of PON standard OLT port and ONU can be one or more PON standard OLT ports and ONUs.

[0049] The optical network transmission device in this embodiment can perform the following routing functions: transmitting the first type PON downlink optical signals sent by n first type PON standard OLT ports to n ODNs respectively, so as to transmit them to the first type PON standard ONUs through the ODNs; receiving the first type PON standard uplink optical signals sent by the first type PON standard ONUs in the n ODNs, and transmitting them to the corresponding first type PON standard OLT ports respectively; splitting and outputting the second type PON standard downlink optical signal sent by one second type PON standard OLT port to n ODNs, so as to transmit them to the second type PON standard ONUs through the ODNs; receiving the second type PON standard uplink optical signals sent by the second type PON standard ONUs in the n ODN networks, and combining and outputting them to the second type PON standard OLT port interface.

[0050] The optical network transmission device provided in this embodiment supports the upgrade and evolution of OLTs and ONUs of the first type of PON standard to OLTs and ONUs of the second type of PON standard while keeping the first type of PON standard equipment and ports unchanged. At the same time, one OLT port of the second type of PON standard can support the upgrade of ONUs in multiple ODN networks of the first type of PON standard.

[0051] The optical network transmission apparatus and method, and optical network system provided in this application embodiment, wherein the first port of the first multiplexer / demultiplexer is connected to the port of a Type I Passive Optical Network (PON) OLT, the second port of the first multiplexer / demultiplexer is connected to at least one Optical Distribution Network (ODN), the optical distribution module is used to perform splitting / multiplexing processing on the optical signal, and its common port is connected to a Type II PON OLT port. Multiple branch ports of the optical distribution module are respectively connected to the third port of one of the multiple first multiplexers / demultiplexers. That is, after passing through the optical distribution module and the multiplexer / demultiplexer, the Type II PON OLT port shares a single ODN port with multiple Type I PON OLT ports, reducing the number of ports on the Type II PON OLT and lowering the initial deployment cost of the optical network; the Type I PON OLT... The PON-compliant OLT port can interact with both Type I and Type II PON-compliant ONUs in the ODN via a first multiplexer / splitter. Similarly, the Type II PON-compliant OLT port can interact with both Type I and Type II PON-compliant ONUs in the ODN via an optical distribution module and the first multiplexer / splitter. Therefore, a single Type II PON-compliant OLT port can support the upgrade of multiple Type I PON-compliant ONUs in the ODN network. This allows the Type II PON-compliant OLT port to interact with both Type I and Type II PON-compliant ONUs in the ODN, improving the utilization of the Type II PON-compliant OLT port (50G-PON port) and bandwidth, and reducing the initial deployment cost of Type II PON-compliant equipment.

[0052] In this embodiment of the disclosure, the optical distribution module is used to distribute the second type PON optical signal to n branch optical paths. The optical distribution module can perform the distribution on the optical signal, or it can perform the distribution on the electrical signal after converting the optical signal into an electrical signal.

[0053] In this embodiment, the optical distribution module distributes optical signals, which can be achieved by a single optical splitter or multiple optical splitters connected to a multiplexer / demultiplexer. The first multiplexer / demultiplexer 100 and the optical distribution module 200 cause losses in the Type II PON optical signal, potentially preventing the Type II PON OLT optical module from supporting the original ODN link budget. The more ODNs to which the Type II PON optical signal is distributed, the greater the loss introduced by the optical distribution module 200. For example, if the Type II PON optical signal is distributed to 8 ODNs, the loss increases by at least 9 dB.

[0054] To compensate for the loss of the second type of PON optical signal, the optical network transmission device provided in this embodiment also includes a second type of optoelectronic optical regeneration module, which is used to compensate for the loss of the second type of PON optical signal by the first multiplexer / demultiplexer 100 and the optical distribution module 200 in the passive optical network device.

[0055] Figure 2 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown. Figure 2 As shown, the optical network transmission device includes multiple first multiplexers / demultiplexers 100, an optical distribution module 200, a first wavelength division multiplexing (WDM) module 300, a second type of optoelectronic regeneration module 400, and a second wavelength division multiplexing (WDM) module 500.

[0056] The first port of the first multiplexer / splitter 100 is connected to the port of the first type PON standard OLT, the second port of the first multiplexer / splitter 100 is connected to the ODN, and the third port of the first multiplexer / splitter 100 is connected to the second port of the second WDM module 500.

[0057] The first port of the optical distribution module 200 is connected to the second type PON standard OLT port. The optical distribution module 200 can have multiple branch ports, and each branch port is connected to the first port of a first WDM module 300. The first WDM module 300 is used to perform multiplexing and splitting processing on the second type PON standard optical signal.

[0058] The first port of the second type of optoelectronic regeneration module 400 is connected to the second port of the first WDM module 300 to compensate for the loss of the second type of PON optical signal.

[0059] The first port of the second WDM module 500 is connected to the second port of the second type of optoelectronic regeneration module 400, and the second port of the second WDM module is connected to the third port of the first multiplexer / demultiplexer 100, for multiplexing and demultiplexing of the second type of PON optical signal.

[0060] Figure 3 A schematic diagram of the structure of a second type of photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 3 As shown, the second type of optoelectronic regeneration module 400 includes: a downlink receiver 410, an optoelectronic regeneration unit 420, a downlink laser detector diode (LDD) unit 430, a downlink transmitter 440, an uplink receiver 450, an uplink LDD unit 460, and a first uplink transmitter 470.

[0061] The first port of the downlink receiver 410 is the first port of the second type of optoelectronic regeneration module 400, which is connected to the first WDM module 300 and is used to convert the second type of PON downlink optical signal into a downlink electrical signal.

[0062] The first port of the photoelectric regeneration unit 420 is connected to the second port of the downlink receiver 410 for processing such as equalization and clock recovery of the downlink electrical signal to generate a second downlink electrical signal.

[0063] The first port of the downlink LDD unit 430 is signal-connected to the second port of the photoelectric regeneration unit 420, and is used to generate a downlink drive signal in response to the second downlink electrical signal.

[0064] The first port of the downlink transmitter 440 is signal-connected to the second port of the downlink LDD unit 430. The second port of the downlink transmitter 440 is the third port of the second type of optoelectronic regeneration module 400 and is connected to the second WDM module 500. Under the drive of the downlink drive signal, the downlink transmitter 440 converts the second downlink electrical signal into a second type of PON standard second downlink optical signal and sends the second type of PON standard second downlink optical signal to the ODN.

[0065] The first port of the uplink receiver 450 is the fourth port of the second type of optoelectronic regeneration module 400, which is connected to the second WDM module 500 and is used to convert the second type of PON uplink optical signal into an uplink electrical signal.

[0066] The third port of the photoelectric regeneration unit 420 is connected to the second port of the uplink receiver 450. The photoelectric regeneration unit 420 is also used to perform equalization, burst clock recovery and other processing on the uplink electrical signal to generate a second uplink electrical signal.

[0067] The first port of the uplink LDD unit 460 is signal-connected to the fourth port of the photoelectric regeneration unit 420, and is used to generate an uplink drive signal in response to the second uplink electrical signal.

[0068] The first port of the first uplink transmitter 470 is connected to the second port of the uplink LDD unit. The second port of the first uplink transmitter 470 is the second port of the second type of optoelectronic optical regeneration module 400 and is connected to the second WDM module 300. Under the drive of the uplink drive signal, the first uplink transmitter 470 converts the second uplink electrical signal into a second type of PON standard second uplink optical signal.

[0069] The fifth port of the photoelectric regeneration unit 420 is connected to the third port of the uplink receiver 450, and the sixth port is connected to the third port of the first uplink transmitter 470. The photoelectric regeneration unit 420 is also used to extract uplink dynamic bandwidth allocation (DBA) information or uplink burst control signal from the second downlink electrical signal, and to control the uplink receiver to resume receiving uplink burst optical signals, and to control the first uplink transmitter 470 to send uplink burst optical signals.

[0070] In this embodiment, the second type of optoelectronic optical regeneration module 400 has the ability to receive, recover and regenerate PON downlink and uplink optical signals independently, without relying on the second type of PON OLT line card to provide control signals.

[0071] Figure 4 A schematic diagram of another type of photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 4 As shown, the second type of optoelectronic regeneration module 400 includes a downlink receiver 410, an optoelectronic regeneration unit 420, a downlink LDD unit 430, a downlink transmitter 440, an uplink receiver 450, an uplink LDD unit 460, and a first uplink transmitter 470. The connection method of the downlink receiver 410, optoelectronic regeneration unit 420, downlink LDD unit 430, downlink transmitter 440, uplink receiver 450, uplink LDD unit 460, and first uplink transmitter 470 is similar to... Figure 3 The connection method for the second type of photoelectric regeneration module shown is the same, and will not be described again here.

[0072] In this embodiment, the photoelectric regeneration unit 420 includes a downlink signal processing subunit 421, an uplink signal processing subunit 422, and an uplink burst signal control subunit 423.

[0073] The first port of the downlink signal processing subunit 421 is the first port of the photoelectric regeneration unit 420, and the second port of the downlink signal processing subunit 421 is the second port of the photoelectric regeneration unit 420. The downlink signal processing subunit 421 is used to perform equalization and clock recovery processing on the downlink electrical signal to obtain the second downlink electrical signal.

[0074] In some embodiments, the downlink signal processing subunit 421 includes a downlink digital signal processor (DSP) subunit or a downlink clock data recovery (CDR) subunit. The downlink DSP subunit is used to perform equalization processing and clock recovery on the downlink electrical signal, and the downlink CDR subunit is used to recover the clock of the downlink electrical signal.

[0075] The first port of the uplink signal processing subunit 422 is the third port of the photoelectric regeneration unit 420, and the second port of the uplink signal processing subunit 422 is the fourth port of the photoelectric regeneration unit 420. The uplink signal processing subunit 422 is used to perform equalization and clock recovery processing on the uplink electrical signal to obtain the second uplink electrical signal.

[0076] In some embodiments, the uplink signal processing subunit includes an uplink DSP subunit or an uplink CDR subunit. The uplink DSP subunit is used to perform equalization processing and burst clock recovery on the uplink electrical signal, and the uplink CDR subunit is used to recover the clock of the uplink burst electrical signal.

[0077] The first port of the uplink burst signal control subunit 423 is signal-connected to the third port of the downlink signal processing subunit 421. The second port is the fifth port of the photoelectric regeneration unit 420, the third port is the sixth port of the photoelectric regeneration unit 420, and the fourth port is signal-connected to the third port of the uplink signal processing subunit 422. The uplink burst signal control subunit 423 is used to obtain uplink dynamic bandwidth allocation (DBA) information from the downlink signal processing subunit 421 and generate uplink burst control signals based on the DBA information. The uplink burst control signals include an uplink receive reset signal and an uplink burst enable signal. The uplink receive reset signal is used to control the uplink receiver 450 to resume receiving uplink burst optical signals, and the uplink burst enable signal is used to control the first uplink transmitter 470 to send uplink burst optical signals.

[0078] Figure 5 A schematic diagram of the structure of another type of second-class photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 5 As shown, the second type of optoelectronic regeneration module 400 includes a downlink receiver 410, an optoelectronic regeneration unit 420, a downlink LDD unit 430, a downlink transmitter 440, an uplink receiver 450, an uplink LDD unit 460, and a first uplink transmitter 470. The connection method of the downlink receiver 410, optoelectronic regeneration unit 420, downlink LDD unit 430, downlink transmitter 440, uplink receiver 450, uplink LDD unit 460, and first uplink transmitter 470 is similar to... Figure 3 The connection method for the second type of photoelectric regeneration module shown is the same, and will not be described again here.

[0079] In this embodiment, the photoelectric regeneration unit includes a digital signal processor (DSP), which includes a downlink electrical signal equalization and clock recovery subunit 621, an uplink electrical signal equalization and clock recovery subunit 622, and an uplink burst signal control subunit 423.

[0080] The first port of the downlink electrical signal equalization and clock recovery subunit 621 is the first port of the photoelectric regeneration unit 420, and the second port of the downlink electrical signal equalization and clock recovery subunit 621 is the second port of the photoelectric regeneration unit 420. The downlink electrical signal equalization and clock recovery subunit 621 is used to perform equalization and clock recovery processing on the downlink electrical signal to obtain the second downlink electrical signal.

[0081] The first port of the uplink electrical signal equalization and clock recovery subunit 622 is the third port of the photoelectric regeneration unit 420, and the second port of the uplink electrical signal equalization and clock recovery subunit 622 is the fourth port of the photoelectric regeneration unit 420. The uplink electrical signal equalization and clock recovery subunit 622 is used to equalize and perform burst clock recovery processing on the uplink electrical signal to obtain the second uplink electrical signal.

[0082] The first port of the uplink burst signal control subunit 423 is connected to the third port of the downlink electrical signal equalization and clock recovery subunit 621. The second port is the fifth port of the photoelectric regeneration unit 420, the third port is the sixth port of the photoelectric regeneration unit 420, and the fourth port is connected to the uplink electrical signal equalization and clock recovery subunit 622. The uplink burst signal control subunit 423 is used to obtain the uplink burst control signal from the second downlink electrical signal. The uplink burst control signal includes an uplink receive reset signal and an uplink burst enable signal. The uplink receive reset signal is used to control the uplink receiver to resume receiving the uplink burst optical signal, and the uplink burst enable signal is used to control the first uplink transmitter to send the uplink burst optical signal.

[0083] In this embodiment, the uplink burst signal control subunit 423 is built into the DSP, eliminating the need for an additional FPGA or dedicated PON MAC parsing chip. Therefore, latency and jitter can be avoided, while also reducing the cost and size of the optical network transmission device. During normal service, the downlink optical signal can carry uplink ONU online indication information via a custom Ploam message, indicating the currently online ONU ID and distance information. During system registration, the DSP can periodically send reset signals and uplink burst enable signals to the uplink receiver 450 and the first uplink transmitter 470 for system registration and link establishment.

[0084] In some embodiments, the uplink burst signal control subunit 423 is further configured to acquire the optical signal detection SD signal of the uplink receiver 450, determine whether there is an uplink burst optical signal based on the SD signal, and send a reset signal to the uplink receiver 450 and the uplink signal processing subunit 422, and send an uplink burst enable signal to the uplink receiver, if it is determined that there is an uplink burst optical signal based on the SD signal.

[0085] Figure 6 A schematic diagram of the structure of another type of second-class photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 6 As shown, the second type of optoelectronic regeneration module 400 includes a downlink receiver 410, an optoelectronic regeneration unit 420, a downlink LDD unit 430, a downlink transmitter 440, an uplink receiver 450, an uplink LDD unit 460, and a first uplink transmitter 470. The connection method of the downlink receiver 410, optoelectronic regeneration unit 420, downlink LDD unit 430, downlink transmitter 440, uplink receiver 450, uplink LDD unit 460, and first uplink transmitter 470 is similar to... Figure 4 The connection method for the second type of photoelectric regeneration module shown is the same, and will not be described again here.

[0086] In this embodiment, the uplink receiver 450 includes a TIA chip or an LA chip, which generates an optical signal and detects the SD signal. The uplink receiver 450 has a self-reset capability, which can reduce the latency of the control circuit.

[0087] The uplink burst signal control subunit 423 obtains the optical signal from the uplink receiver 450 and detects the SD signal. Based on the SD signal, it determines whether there is an uplink burst optical signal. If it is determined that there is an uplink burst optical signal based on the SD signal, it sends a reset signal to the uplink receiver 450 and the uplink signal processing subunit 422, and sends an uplink burst enable signal to the uplink receiver 450.

[0088] In some embodiments, the second WDM module 500 may be built into the first multiplexer / demultiplexer 100. In this case, the first multiplexer / demultiplexer 100 is a 3-port device with a common port, and the downlink transmitter 440 and the uplink receiver 450 may be connected to the two ports of the first multiplexer / demultiplexer 100, respectively.

[0089] When the first WDM module 300 is set at the front end 2 of the optical distribution module, the uplink optical signal and downlink optical signal are first processed by multiplexing and demultiplexing, and then splitting and combining are performed respectively. In this case, the optical distribution module includes two or more optical splitter devices, such as optical splitters and optical combiners.

[0090] Figure 7A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown. Figure 7 As shown, the optical network transmission device includes a first multiplexer / demultiplexer 100, an optical distribution module 200, a first WDM module 300, and a second type of optoelectronic regeneration module 400.

[0091] The first port of the first multiplexer / demultiplexer 100 is connected to the port of the first type PON standard OLT, the second port of the first multiplexer / demultiplexer 100 is connected to the ONU, and the third port of the first multiplexer / demultiplexer 100 is connected to the second port of the second type optoelectronic regeneration module 400.

[0092] The first port of the first WDM module 300 is connected to the second type PON standard OLT port, and the second port of the first WDM module 300 is connected to the first port of the optical distribution module 200.

[0093] In this embodiment, the optical distribution module 200 includes an optical splitter 210 and an optical combiner 220. The first port of the optical splitter 210 is connected to the second port of the first WDM module 300, the second port of the optical splitter 210 is connected to the first port of the second type of optoelectronic regeneration module 400, and the second port of the second type of optoelectronic regeneration module 400 is connected to the third port of the first multiplexer / demultiplexer 100. The structure of the second type of optoelectronic regeneration module 400 is the same as that in the previous embodiment, and will not be described again here.

[0094] The first port of the optical combiner 220 is connected to the third port of the first WDM module 300, and the second port of the optical combiner 220 is connected to the second port of the second type of optoelectronic regeneration module 400.

[0095] In this embodiment, the downlink receiver 410 and uplink receiver 450 include one or more devices selected from APD, SOA+PIN, TIA, or LA. The downlink transmitter 440 and the first uplink transmitter 470 include one or more devices selected from EML, EML+SOA, DML, and DML+SOA. For example, the downlink transmitter 440 uses EML+SOA, and the first uplink transmitter 470 uses DML.

[0096] This embodiment incorporates an optoelectronic regeneration unit in the optical signal path. The downlink optical signal, after attenuation by the optical distribution module, undergoes optoelectronic conversion and regeneration through this unit, ensuring that the second downlink optical signal output from the ODN port meets the standard-defined downlink optical interface specifications. Similarly, the uplink optical signal, after attenuation by the ODN, is regenerated through the optoelectronic regeneration unit. This ensures that the regenerated second uplink optical signal, after attenuation by the optical distribution module, can be normally received by the OLT optical module. Both the uplink optical power on the ODN side and the uplink received optical power on the OLT receiving side meet the standard-defined uplink optical interface specifications, thereby improving the coverage of the Type II PON OLT port to the ODN while allowing for smooth evolution of the existing ODN network.

[0097] In some embodiments, the second type PON optical signal, after passing through the optical distribution module, requires photoelectric regeneration for both the uplink and downlink optical signals. For the downlink direction, n additional EML or EML+SOA lasers are needed, resulting in relatively high cost and power consumption. Therefore, in some embodiments, in the downlink direction, the second type PON optical signal is amplified by an optical amplifier, then split by an optical splitter and connected to a first multiplexer / demultiplexer 100, which then multiplexes the signal to the corresponding ODN port. This significantly reduces the number of downlink transmitters and lowers the cost of optical network transmission equipment.

[0098] Figure 8 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown. Figure 8 As shown, the optical distribution module includes an optical splitter 210 and an optical combiner 220. The optical network transmission device also includes a second multiplexer / demultiplexer 700, at least one optical amplifier 800, and a third optoelectronic regeneration module 900.

[0099] Specifically, the first port of the second multiplexer / demultiplexer 700 is connected to the port of the second type of passive optical network (PON) OLT, the second port of the second multiplexer / demultiplexer 700 is signal-connected to the first port of the optical combiner, the second port of the optical combiner is signal-connected to the first port of the third optoelectronic regeneration module 900, and the second port of the third optoelectronic regeneration module 900 is signal-connected to the fourth port of the first multiplexer / demultiplexer 100.

[0100] The third port of the second multiplexer / demultiplexer 700 is connected to the first port of the amplifier, the second port of the optical amplifier 800 is connected to the first port of the optical splitter, and the branch port of the optical splitter is signal-connected to the third port of the first multiplexer / demultiplexer 100.

[0101] When the number of supported ODN ports n is large, the gain of a single optical amplifier is insufficient to compensate for the splitter loss. The splitter can be divided into multiple units, located before and after the optical amplifier. In this case, the number of optical amplifiers needs to be increased accordingly based on the number of branch ports of the preceding splitter.

[0102] Figure 9 A schematic diagram of the structure of another optical network transmission device provided in an embodiment of this disclosure is shown. Figure 9 As shown, the optical distribution module includes an m-level optical splitter 210 and an optical combiner 220, where m is an integer greater than or equal to 2.

[0103] The optical network transmission device also includes a second multiplexer / demultiplexer 700, at least one optical amplifier 800, and a third optoelectronic regeneration module 900.

[0104] The first port of the second multiplexer / demultiplexer 700 is connected to the port of the second type PON OLT, the second port of the second multiplexer / demultiplexer 700 is connected to the first port of the optical combiner 220, the second port of the optical combiner 220 is connected to the first port of the third optoelectronic regeneration module 900, and the second port of the third optoelectronic regeneration module 900 is connected to the fourth port of the first multiplexer / demultiplexer.

[0105] The third port of the second combiner / splitter 700 is connected to the first port of the i-th stage optical splitter 210. The branch port of the i-th stage optical splitter 210 is connected to the first port of one of the at least one optical amplifiers 800. The second port of the optical amplifier 800 is connected to the first port of the (i+1)-th stage optical splitter 210. The branch port of the n-th stage optical splitter 210 is connected to the third port of the first combiner / splitter.

[0106] Figure 10 A schematic diagram of the structure of a third photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 10 As shown, the third optoelectronic regeneration module includes an uplink receiver 450, an uplink signal processing subunit 422, an uplink LDD unit 460, a first uplink transmitter 470, and an uplink burst signal control subunit 423.

[0107] The first port of the uplink receiver 450 is the second port of the third optoelectronic regeneration module, which is used to convert the uplink optical signal of the second type PON system into an uplink electrical signal.

[0108] The first port of the uplink signal processing subunit 422 is connected to the second port of the uplink receiver 450 for equalization and clock recovery processing of the uplink electrical signal to generate a second uplink electrical signal.

[0109] The first port of the uplink LDD unit 460 is connected to the second port of the uplink signal processing subunit 422, and is used to generate an uplink drive signal in response to the second uplink electrical signal.

[0110] The first port of the first uplink transmitter 470 is signal-connected to the second port of the uplink LDD unit 460. The second port of the first uplink transmitter 470 is the second port of the third optoelectronic regeneration module. Under the drive of the uplink drive signal, the first uplink transmitter 470 converts the second uplink electrical signal into a second type PON standard second uplink optical signal.

[0111] The second port of the uplink burst signal control subunit 423 is connected to the third port of the uplink receiver 450, the third port is connected to the third port of the first uplink transmitter 470, and the fourth port is connected to the third port of the uplink signal processing subunit 422. The uplink burst signal control subunit 423 is used to obtain the SD signal of the uplink receiver 450, generate a reset signal and an uplink burst enable signal, send the reset signal to the uplink receiver 450 and the uplink signal processing subunit 422, and send the uplink burst enable signal to the first uplink transmitter 470.

[0112] Figure 11 A schematic diagram of another third photoelectric regeneration module provided in an embodiment of this disclosure is shown. Figure 11 As shown, the third optoelectronic regeneration module includes an uplink receiver 450, an uplink signal processing subunit 422, an uplink LDD unit 460, a first uplink transmitter 470, a downlink receiver 410, an uplink burst signal extraction unit 425, and an uplink burst signal control subunit 423.

[0113] The first port of the uplink receiver 450 is the second port of the third optoelectronic regeneration module, which is used to convert the second type PON uplink optical signal into an uplink electrical signal.

[0114] The first port of the uplink signal processing subunit 422 is connected to the second port of the uplink receiver 450 for equalization and clock recovery processing of the uplink electrical signal to generate a second uplink electrical signal.

[0115] The first port of the uplink LDD unit 460 is connected to the second port of the uplink signal processing subunit 422, and is used to generate an uplink drive signal in response to the second uplink electrical signal.

[0116] The first port of the first uplink transmitter 470 is connected to the second port of the uplink LDD unit 460. The second port of the first uplink transmitter 470 is the second port of the third optoelectronic regeneration module. Under the drive of the uplink drive signal, the first uplink transmitter 470 converts the second uplink electrical signal into a second type PON standard second uplink optical signal.

[0117] The downlink receiver 410 is used to receive downlink optical signals.

[0118] The first end of the uplink burst signal extraction unit 425 is connected to the downlink receiver 410 for extracting DBA information from the downlink optical signal.

[0119] The first port of the uplink burst signal control subunit 423 is connected to the second port of the uplink burst signal extraction unit 425. The second port is connected to the third port of the uplink receiver 450. The third port is connected to the third port of the first uplink transmitter 470. The fourth port is connected to the third port of the uplink signal processing subunit 422. The uplink burst signal control subunit 423 generates a reset signal and an uplink burst enable signal based on the DBA information, and sends the reset signal to the uplink receiver 450 and the uplink signal processing subunit 422, and sends the uplink burst enable signal to the first uplink transmitter 470.

[0120] In some embodiments, the uplink signal processing subunit 422 includes an uplink DSP subunit or an uplink CDR subunit. The uplink DSP subunit is used to perform equalization and clock recovery processing on the uplink electrical signal, and the uplink CDR subunit is used to recover the clock of the uplink electrical signal.

[0121] Both the second type of optoelectronic regeneration module and the third type of optoelectronic regeneration module require n first uplink transmitters. Therefore, this embodiment also provides an optical network transmission device that reduces the number of first uplink transmitters.

[0122] Figure 12 A schematic diagram of the structure of an optical network transmission device provided in an embodiment of this disclosure is shown. Figure 12 As shown, the optical network transmission device includes a first multiplexer / demultiplexer 100, an optical distribution module, an optoelectronic conversion module 10, a second multiplexer / demultiplexer 700, an optical amplifier 800, and an optical splitter 210. The optical distribution module includes an optical splitter 210, a path selection module 20, and a second uplink transmitter 30.

[0123] The first port of the photoelectric conversion module 10 is connected to the fourth port of the first multiplexer / demultiplexer 100 to convert the uplink optical signal into an uplink electrical signal.

[0124] The first port of the path selection module 20 is connected to the second port of the photoelectric conversion module 10 for processing multiple uplink electrical signals.

[0125] The first port of the second uplink transmitter 30 is signal-connected to the second port of the path selection module 20, and is used to convert the processed uplink electrical signal into an uplink optical signal.

[0126] The first port of the second multiplexer / demultiplexer 700 is signal-connected to the second port of the second uplink transmitter 30, and is used to send the uplink optical signal to the second type PON OLT port.

[0127] The first port of the optical amplifier 800 is connected to the third port of the second multiplexer / demultiplexer 700 for amplifying the downlink optical signal.

[0128] The first port of the optical splitter 210 is connected to the second port of the optical amplifier 800, and the branch port of the optical splitter 210 is connected to the third port of the first multiplexer / demultiplexer. The optical splitter 210 is used to split the amplified downlink optical signal and send the split downlink optical signal to the corresponding first multiplexer / demultiplexer.

[0129] Figure 13 A partial structural schematic diagram of an optical network transmission device provided in an embodiment of this disclosure is shown. For example... Figure 13 As shown, the path selection module 20 includes an electric combiner or a DSP chip. This embodiment will use an electric combiner as an example for description.

[0130] The photoelectric conversion module 10 includes an uplink receiver 450 and an uplink burst signal control subunit 423. The first port of the uplink receiver 450 is the first port of the photoelectric conversion module 10, and the second port of the uplink receiver 450 is signal-connected to the first port of the path selection module 20. The uplink receiver 450 is used to convert uplink optical signals into uplink electrical signals. The electrical combiner is used to combine the uplink electrical signals converted by multiple uplink receivers 450 and output them to the second uplink transmitter 30.

[0131] The first port of the uplink burst signal control subunit 423 is connected to the third port of the uplink receiver 450 for transmitting the SD signal generated by the uplink receiver 450; the second port of the uplink burst signal control subunit 423 is connected to the third port of the second uplink transmitter 30 for controlling the second uplink transmitter 30 to turn on according to the SD signal.

[0132] In this embodiment, the uplink receiver 450 includes photodetectors such as APD and SOA+PIN, as well as a TIA chip and an LA chip, used to amplify the electrical signal and generate an SD signal to be sent to the uplink burst signal control subunit 423. n uplink receivers 450 can generate n SD signals. After receiving any SD signal, the uplink burst signal control subunit 423 controls the uplink transmitter to turn on.

[0133] Figure 14 A partial structural schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown. For example... Figure 14 As shown, the DSP chip includes a data recovery and parsing module 21 and a data reconstruction module 22.

[0134] The optical network transmission device includes a second uplink transmitter 30, an uplink receiver 450, a DSP chip, and an uplink burst signal control subunit 423. The first port of the second uplink transmitter 30 is connected to the second port of the second multiplexer / demultiplexer. The second port of the second uplink transmitter 30 and the second port of the uplink receiver 450 are connected to the DSP chip. The first port of the uplink receiver 450 is connected to the fourth port of the first multiplexer / demultiplexer.

[0135] The first port of the data recovery and parsing module 21 is connected to the second port of the uplink receiver 450, and is used to perform data clock recovery and data parsing on the uplink electrical signal sent by the uplink receiver 450 to obtain the data parsing result.

[0136] The first port of the data reconstruction module 22 is connected to the second port of the data recovery and parsing module 21. The second port of the data reconstruction module 22 is connected to the first port of the second uplink transmitter 30. The data reconstruction module 22 is used to reconstruct the data parsing results corresponding to different uplink receivers to obtain a single data stream.

[0137] Figure 15 A partial structural schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown. For example... Figure 15 As shown, the path selection module includes an electrical switch, and the photoelectric conversion module includes an uplink receiver 450 and an uplink burst signal control subunit 423. The first port of the uplink receiver 450 is the first port of the photoelectric conversion module, and the second port of the uplink receiver 450 is signal-connected to the first port of the path selection module. The uplink receiver 450 is used to convert uplink optical signals into uplink electrical signals.

[0138] The first port of the uplink burst signal control subunit 423 is connected to the third port of the uplink receiver 450 for transmitting the SD signal generated by the uplink receiver 450; the second port of the uplink burst signal control subunit 423 is connected to the third port of the uplink transmitter, and the third port of the uplink burst signal control subunit 423 is connected to the third port of the electrical switch; the uplink burst signal control subunit 423 is used to control the uplink transmitter to turn on according to the SD signal. The uplink burst signal control subunit 423 is also used to select the electrical switch connection path corresponding to the source uplink receiver 450 according to the received SD signal.

[0139] In this embodiment, the uplink photoelectric regeneration module is replaced by a photoelectric conversion module 10. The photoelectric conversion module only includes an uplink optical receiver module and an uplink burst signal control subunit. The uplink electrical signal converted by the photoelectric conversion module 10 is combined by an electrical combiner or selected by an electrical switch to the second uplink transmitter 30. The second uplink transmitter 30 includes an EML / EML+SOA / DML / DML+SOA laser and an LDD driver chip. In some embodiments, the second uplink transmitter 30 also includes a DSP / CDR chip for clock recovery and uplink electrical signal equalization / pre-equalization. After the second uplink transmitter 30 converts the received uplink electrical signal into an uplink optical signal, it is input to the second port of the second multiplexer / demultiplexer. After being combined by the second multiplexer / demultiplexer, it is sent to the second type PON standard OLT port.

[0140] In this embodiment, the splitter and combiner are two independent units. The downlink splitter includes an optical splitter, and the uplink combiner includes an electrical combiner or an electrical switch. This can further reduce the number of uplink transmitters, reduce costs, and realize the combining and regeneration of multiple Type II PON uplink optical signals, thereby realizing optical signal routing and regeneration functions and extending the coverage of the Type II PON port to n ODNs.

[0141] Figure 16 A schematic diagram of another optical network transmission device provided in an embodiment of this disclosure is shown. Figure 16 As shown, the optical network transmission device includes multiple first multiplexers / splitters 100 and an optical distribution module 200. The first port of each first multiplexer / splitter 100 is connected to a first-type PON standard OLT port, the second port of each first multiplexer / splitter 100 is connected to an ONU, and the third port of each first multiplexer / splitter 100 is connected to a branch port of the optical distribution module 200. The first port of the optical distribution module 200 is connected to a second-type PON standard OLT port.

[0142] The second type of PON standard OLT port includes a third multiplexer / demultiplexer 50, a second type of PON standard transmitter 51, an optical amplifier 800, and a second type of PON standard receiver 53. The first port of the third multiplexer / demultiplexer 50 is connected to the optical distribution module; the first port of the second type of PON standard transmitter 51 is connected to the second port of the multiplexer / demultiplexer for transmitting second type PON downlink optical signals; the first port of the optical amplifier 800 is connected to the third port of the third multiplexer / demultiplexer 50 for amplifying second type PON uplink optical signals; and the first port of the second type of PON standard receiver 53 is connected to the second port of the optical amplifier 800 for receiving the amplified uplink optical signals.

[0143] In some embodiments, the second type PON transmitter 51 includes an optical amplification module and a second type PON optical transmission module. The second type PON optical transmission module is used to transmit the second type PON downlink optical signal, and the optical amplification module is used to amplify the second type PON downlink optical signal and send it to the third multiplexer / demultiplexer 50.

[0144] In some embodiments, the first type of PON OLT port includes one or more of a single PON OLT port, multiple PON OLT ports, and multiple PON Combo OLT ports.

[0145] Among them, a single PON standard OLT port includes one or more of the following: Type I Gigabit Passive Optical Network (GPON), 10G Passive Optical Network (XGPON), or Symmetric 10G Passive Optical Network (XGS PON); and / or, multiple PON standard OLT ports include one or more of the following: GPON port, XG PON port, and XGS PON port; multiple PON standard Combo OLT ports include independent, GPON&XG PON Combo port, GPON&XGS PON Combo port, and GPON&XG PON&XGS PON Combo port.

[0146] In some embodiments, the second type of PON OLT port includes one or more of a single PON OLT port, multiple PON OLT ports, and multiple PON Combo OLT ports.

[0147] Among them, a single PON standard OLT port includes one or more of 50G PON symmetrical ports and 50G PON asymmetrical ports; multiple PON standard OLT ports include one or more of 50G PON ports and 200G PON ports; multiple PON standard Combo OLT ports include one or more of GPON & XG(S) ports, PON & 50G PON Combo ports, and 50G PON & 200G PON Combo ports.

[0148] The optical network transmission device provided in this embodiment includes a passive optical network transmission device or other forms of optical network transmission device.

[0149] Secondly, embodiments of this disclosure provide an optical network transmission method, which is applied to any of the optical network transmission devices provided in the embodiments of this disclosure.

[0150] Figure 17 A flowchart illustrating an embodiment of the optical network transmission method provided in this disclosure is shown. Figure 17 As shown, the method includes:

[0151] Step S1901: Receive downlink optical signals of type 1 PON from at least one type 1 PON OLT port and transmit them to at least one type 1 PON ONU in an optical distribution network (ODN); and receive uplink optical signals of type 1 PON from at least one type 1 PON ONU in an ODN and transmit them to the corresponding type 1 PON OLT port.

[0152] And / or, in step S1902, receive a Type II PON downlink optical signal sent by a Type II PON OLT port, split and transmit it to at least one Type II PON ONU in an ODN; receive a Type II PON uplink optical signal sent by at least one Type II PON ONU in an ODN, and combine and output it to a Type II PON OLT port.

[0153] The optical network transmission method provided in this disclosure includes receiving first-type PON downlink optical signals transmitted from at least one first-type PON OLT port and transmitting them to at least one first-type PON ONU in an optical distribution network (ODN); and receiving first-type PON uplink optical signals transmitted from at least one first-type PON ONU in an ODN and transmitting them to corresponding first-type PON OLT ports; and / or receiving second-type PON downlink optical signals transmitted from a second-type PON OLT port and splitting them for transmission to at least one second-type PON ONU in an ODN; receiving At least one Type II PON ONU in the ODN transmits a Type II PON uplink optical signal, which is then combined and output to a Type II PON OLT port. This allows for the upgrade of multiple Type I PON ONUs in the ODN network using only one Type II PON OLT port. This enables the Type II PON OLT port to interact with both Type I and Type II PON ONUs in the ODN, improving the utilization of the Type II PON OLT port (50G-PON port) and bandwidth, and reducing the initial deployment cost of Type II PON equipment.

[0154] Thirdly, embodiments of this disclosure provide an optical network system, and the method is applied to any of the optical network transmission devices provided in embodiments of this disclosure.

[0155] Figure 18 A schematic diagram of the structure of an optical network system provided by an embodiment of this disclosure is shown. For example... Figure 18 As shown, the optical network system includes: multiple Type I PON standard OLT terminals 2001, one Type II PON standard OLT terminal 2002, multiple optical distribution networks (ODNs), and optical network transmission devices 2004. In some embodiments, Type I PON standard optical network units (ONUs) and Type II PON standard ONUs are provided in the ODN.

[0156] The first port of the optical network transmission device 2004 is connected to a first type PON standard OLT signal via a first type PON standard OLT port and to a second type PON standard OLT signal via a second type PON standard OLT port; the second port of the optical network transmission device is connected to the first port signal of multiple ODN networks; the optical network transmission device includes any of the optical network transmission devices provided in the embodiments of this disclosure.

[0157] The optical network system provided in this embodiment has a first port of a first multiplexer / demultiplexer connected to a first-type passive optical network (PON) OLT port, a second port of the first multiplexer / demultiplexer connected to at least one optical distribution network (ODN), a common port of an optical distribution module connected to a second-type PON OLT port, and multiple branch ports of the optical distribution module connected to the third port of one of the multiple first multiplexers / demultiplexers. In other words, after passing through the optical distribution module and multiplexers / demultiplexers, the second-type PON OLT port shares a single ODN port with multiple first-type PON OLT ports, reducing the number of ports in the optical network transmission device and lowering the initial deployment cost of the optical network. The first-type PON OLT port is connected to the first multiplexer / demultiplexer... The filter can interact with both Type I PON and Type II PON ONUs in the ODN via optical signal exchange. The Type II PON OLT port can also interact with both Type I PON and Type II PON ONUs in the ODN via optical distribution module and first multiplexer / splitter. Therefore, one Type II PON OLT port can support the upgrade of multiple Type I PON ONUs in the ODN network, enabling the Type II PON OLT port to interact with both Type I and Type II PON ONUs in the ODN via optical signal exchange. This improves the utilization rate of the Type II PON OLT port (50G-PON port) and bandwidth, and reduces the initial deployment cost of Type II PON equipment.

[0158] In some embodiments, the optical network transmission device is located at the OLT, or between the OLT and the ODN network. The OLT terminal may be an OLT line card or other device.

[0159] Figure 19 A schematic diagram of another optical network system provided in an embodiment of this disclosure is shown. For example... Figure 19 As shown, the optical network system includes n Type I PON standard OLT terminals 2001, one Type II PON standard OLT terminal 2002, n optical distribution networks (ODNs), and optical network transmission devices 2004.

[0160] The optical network transmission device is located on the OLT equipment side, connecting n Type I PON standard OLT line card ports and one Type II PON standard OLT line card port, and routing to n ODN networks. Each of the n ODN networks can deploy Type I PON standard ONUs and Type II PON standard ONUs. It can support the upgrade and evolution of Type I PON standard OLTs and ONUs to Type II PON standard OLTs and ONUs while keeping the original Type I PON standard equipment and ports unchanged. At the same time, a single Type II PON standard OLT port can support the upgrade of ONUs in multiple Type I PON standard ODN networks, effectively improving the utilization rate and coverage of Type II PON standard ports and bandwidth, while reducing the initial deployment cost of Type II PON standard equipment.

[0161] Figure 20 A schematic diagram of the structure of another optical network system provided in an embodiment of this disclosure is shown. For example... Figure 20 As shown, the optical network system includes n Type I PON standard OLT terminals 2001, one Type II PON standard OLT terminal 2002, n optical distribution networks (ODNs), and an optical network transmission device 2004. The optical network transmission device 2004 is located between the OLT terminals and the ODN networks.

[0162] Since the optical network transmission device is independent of the Type I PON standard OLT line card and the Type II PON standard OLT line card, the optical network transmission device does not require the Type I PON standard OLT line card and the Type II PON standard OLT line card to provide control signals for the routing, regeneration and amplification of Type I PON standard and Type II PON standard optical signals.

[0163] Example embodiments have been described herein, and while specific terminology has been used, it is intended and should be interpreted only in a general illustrative sense and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this application as set forth by the appended claims.

Claims

1. An optical network transmission apparatus, characterized by comprising: include: Multiple first multiplexers and splitters are provided. The first port of the first multiplexer and splitter is connected to the port of the optical line terminal (OLT) of the first type of passive optical network (PON). The second port of the first multiplexer and splitter is connected to at least one optical distribution network (ODN). The ODN is provided with a first type of PON optical network unit (ONU) and a second type of PON ONU. An optical distribution module is used to split / combine optical signals. It includes a common port and multiple branch ports. The common port of the optical distribution module is connected to a Type II PON OLT port. The multiple branch ports of the optical distribution module are respectively connected to the third port signal of one of the multiple first multiplexers / demultiplexers.

2. The optical network transmission device of claim 1, wherein, Also includes: The first wavelength division multiplexing (WDM) module has its first port connected to the branch port signal of the optical distribution module. The first WDM module is used to perform multiplexing and demultiplexing processing on the second type of PON optical signal. The second type of optoelectronic regeneration module has its first port connected to the second port of the first WDM module to compensate for the loss of the second type of PON optical signal. The second wavelength division multiplexing (WDM) module has its first port connected to the second port of the second type of optoelectronic regeneration module, and its second port connected to the third port of the first multiplexer / demultiplexer. It is used to perform wavelength division processing on the uplink optical signal of the second type of PON system.

3. The optical network transmission device according to claim 1, characterized in that, Also includes: The first wavelength division multiplexing (WDM) module has a first port connected to the second type PON standard OLT port signal and a second port connected to the common port signal of the optical distribution module. The first WDM module is used to perform multiplexing and demultiplexing processing on the second type PON standard optical signal. The second type of optoelectronic regeneration module has its first port connected to the branch port of the optical distribution module to compensate for the loss of the second type of PON optical signal. The second wavelength division multiplexing (WDM) module has its first port connected to the second port of the second type of optoelectronic regeneration module, and its second port connected to the third port of the first multiplexer / demultiplexer. It is used to perform wavelength division processing on the uplink optical signal of the second type of PON system.

4. The optical network transmission device according to claim 2 or 3, characterized in that, The second type of photoelectric regeneration module includes: A downlink receiver, wherein the first port of the downlink receiver is the first port of the second type of optoelectronic regeneration module, used to convert the second type of PON downlink optical signal into a downlink electrical signal; A photoelectric regeneration unit, wherein the first port of the photoelectric regeneration unit is signal-connected to the second port of the downlink receiver, and is used to process the downlink electrical signal to generate a second downlink electrical signal; A downlink laser detector diode (LDD) unit, wherein the first port of the downlink LDD unit is signal-connected to the second port of the photoelectric regeneration unit, and is used to generate a downlink drive signal in response to the second downlink electrical signal; The downlink transmitter has its first port connected to the second port of the downlink LDD unit. The second port of the downlink transmitter is the third port of the second type of optoelectronic regeneration module. Under the drive of the downlink drive signal, the downlink transmitter converts the second downlink electrical signal into a second type of PON standard second downlink optical signal and sends the second type of PON standard second downlink optical signal to the ODN. An uplink receiver, wherein the first port of the uplink receiver is the fourth port of the second type of optoelectronic regeneration module, used to convert the second type of PON uplink optical signal into an uplink electrical signal; The third port of the photoelectric regeneration unit is connected to the second port of the uplink receiver. The photoelectric regeneration unit is also used to process the uplink electrical signal to generate a second uplink electrical signal. An uplink LDD unit, wherein the first port of the uplink LDD unit is signal-connected to the fourth port of the photoelectric regeneration unit, and is used to generate an uplink drive signal in response to the second uplink electrical signal; The first uplink transmitter has its first port connected to the second port of the uplink LDD unit. The second port of the first uplink transmitter is the second port of the second type of optoelectronic regeneration module. Under the drive of the uplink drive signal, the first uplink transmitter converts the second uplink electrical signal into a second type of PON standard second uplink optical signal. The fifth port of the photoelectric regeneration unit is connected to the third port of the uplink receiver, and the sixth port is connected to the third port of the first uplink transmitter. The photoelectric regeneration unit is also used to obtain uplink burst control signals from uplink dynamic bandwidth allocation (DBA) information or downlink electrical signals, and to control the uplink receiver to resume receiving uplink burst optical signals, and to control the first uplink transmitter to send the uplink burst optical signals.

5. The optical network transmission device according to claim 4, characterized in that, The photoelectric regeneration unit includes a downlink signal processing subunit, an uplink signal processing subunit, and an uplink burst signal control subunit; Wherein, the first port of the downlink signal processing subunit is the first port of the photoelectric regeneration unit, the second port of the downlink signal processing subunit is the second port of the photoelectric regeneration unit, and the downlink signal processing subunit is used to perform equalization and clock recovery processing on the downlink electrical signal to obtain a second downlink electrical signal; The first port of the uplink signal processing subunit is the third port of the photoelectric regeneration unit, and the second port of the uplink signal processing subunit is the fourth port of the photoelectric regeneration unit. The uplink signal processing subunit is used to perform equalization and clock recovery processing on the uplink electrical signal to obtain a second uplink electrical signal. The first port of the uplink burst signal control subunit is signal-connected to the third port of the downlink signal processing subunit. The second port is the fifth port of the photoelectric regeneration unit, the third port is the sixth port of the photoelectric regeneration unit, and the fourth port is signal-connected to the third port of the uplink signal processing subunit. The uplink burst signal control subunit is used to obtain uplink dynamic bandwidth allocation (DBA) information from the downlink signal processing subunit and generate the uplink burst control signal based on the DBA information. The uplink burst control signal includes an uplink receive reset signal and an uplink burst enable signal. The uplink receive reset signal is used to control the uplink receiver to resume receiving the uplink burst optical signal, and the uplink burst enable signal is used to control the first uplink transmitter to send the uplink burst optical signal.

6. The optical network transmission device according to claim 5, characterized in that, The downlink signal processing subunit includes a downlink digital signal processor (DSP) subunit or a downlink clock data recovery (CDR) subunit. The downlink DSP subunit is used to perform equalization processing on the downlink electrical signal, and the downlink CDR subunit is used to recover the clock of the downlink electrical signal. The uplink signal processing subunit includes an uplink DSP subunit or an uplink CDR subunit. The uplink DSP subunit is used to perform equalization processing on the uplink electrical signal, and the uplink CDR subunit is used to recover the clock of the uplink electrical signal.

7. The optical network transmission device according to claim 4, characterized in that, The photoelectric regeneration unit includes a digital signal processor (DSP), which includes a downlink electrical signal equalization and clock recovery subunit, an uplink electrical signal equalization and clock recovery subunit, and an uplink burst signal control subunit. Wherein, the first port of the downlink electrical signal equalization and clock recovery subunit is the first port of the photoelectric regeneration unit, the second port of the downlink electrical signal equalization and clock recovery subunit is the second port of the photoelectric regeneration unit, and the downlink electrical signal equalization and clock recovery subunit is used to perform equalization and clock recovery processing on the downlink electrical signal to obtain a second downlink electrical signal; The first port of the uplink electrical signal equalization and clock recovery subunit is the third port of the photoelectric regeneration unit, and the second port of the uplink electrical signal equalization and clock recovery subunit is the fourth port of the photoelectric regeneration unit. The uplink electrical signal equalization and clock recovery subunit is used to perform equalization and clock recovery processing on the uplink electrical signal to obtain a second uplink electrical signal. The first port of the uplink burst signal control subunit is connected to the third port of the downlink electrical signal equalization and clock recovery subunit. The second port is the fifth port of the photoelectric regeneration unit, the third port is the sixth port of the photoelectric regeneration unit, and the fourth port is connected to the uplink electrical signal equalization and clock recovery subunit. The uplink burst signal control subunit is used to obtain the uplink burst control signal from the second downlink electrical signal. The uplink burst control signal includes an uplink receive reset signal and an uplink burst enable signal. The uplink receive reset signal is used to control the uplink receiver to resume receiving the uplink burst optical signal, and the uplink burst enable signal is used to control the first uplink transmitter to send the uplink burst optical signal.

8. The optical network transmission apparatus according to claim 5 or 7, characterized in that, The uplink burst signal control subunit is also used to acquire the standby control SD signal of the uplink receiver, and when it is determined based on the SD signal that the uplink burst optical signal exists, send a reset signal to the uplink receiver and the uplink signal processing subunit, and send the uplink burst enable signal to the uplink receiver.

9. The optical network transmission device according to claim 1, characterized in that, The optical distribution module includes an optical splitter and an optical combiner; The optical network transmission device further includes a second multiplexer / demultiplexer, at least one optical amplifier, and a third optoelectronic regeneration module; Wherein, the first port of the second multiplexer / demultiplexer is connected to the port of the first type of passive optical network (PON) OLT, the second port of the second multiplexer / demultiplexer is signal-connected to the first port of the optical combiner, the second port of the optical combiner is signal-connected to the first port of the third optoelectronic regeneration module, and the second port of the third optoelectronic regeneration module is signal-connected to the fourth port of the first multiplexer / demultiplexer. The third port of the second multiplexer / demultiplexer is connected to the first port of the amplifier, the second port of the optical amplifier is connected to the first port of the optical splitter, and the branch port of the optical splitter is signal-connected to the third port of the first multiplexer / demultiplexer.

10. The optical network transmission device according to claim 1, characterized in that, The optical distribution module includes an n-stage optical splitter and an optical combiner, where n is an integer greater than or equal to 2; The optical network transmission device further includes a second multiplexer / demultiplexer, at least one optical amplifier, and a third optoelectronic regeneration module; Wherein, the first port of the second multiplexer / demultiplexer is connected to the port of the first type of passive optical network (PON) standard OLT, the second port of the second multiplexer / demultiplexer is connected to the first port of the optical combiner, the second port of the optical combiner is connected to the first port of the third optoelectronic regeneration module, and the second port of the third optoelectronic regeneration module is connected to the fourth port of the first multiplexer / demultiplexer. The third port of the second multiplexer / demultiplexer is connected to the first port of the i-th stage optical splitter, the branch port of the i-th stage optical splitter is connected to the first port of one of the at least one optical amplifiers, the second port of the optical amplifier is connected to the first port of the (i+1)-th stage optical splitter, and the branch port of the n-th stage optical splitter is connected to the third port of the first multiplexer / demultiplexer.

11. The optical network transmission apparatus according to claim 9 or 10, characterized in that, The third photoelectric regeneration module includes: An uplink receiver, wherein the first port of the uplink receiver is the second port of the third optoelectronic regeneration module, used to convert the second type PON uplink optical signal into an uplink electrical signal; An uplink signal processing subunit, wherein the first port of the uplink signal processing subunit is signal-connected to the second port of the uplink receiver, is used to process the uplink electrical signal to generate a second uplink electrical signal; An uplink LDD unit, wherein the first port of the uplink LDD unit is signal-connected to the second port of the uplink signal processing subunit, and is used to generate an uplink drive signal in response to the second uplink electrical signal; The first uplink transmitter has its first port connected to the second port of the uplink LDD unit. The second port of the first uplink transmitter is the second port of the third optoelectronic regeneration module. Under the drive of the uplink drive signal, the first uplink transmitter converts the second uplink electrical signal into a second type PON standard second uplink optical signal. An uplink burst signal control subunit is provided. The second port of the uplink burst signal control subunit is connected to the third port of the uplink receiver, the third port is connected to the third port of the first uplink transmitter, and the fourth port is connected to the third port of the uplink signal processing subunit. The uplink burst signal control subunit is used to obtain the SD signal of the uplink receiver, generate a reset signal and an uplink burst enable signal, send the reset signal to the uplink receiver and the uplink signal processing subunit, and send the uplink burst enable signal to the first uplink transmitter.

12. The optical network transmission apparatus according to claim 9 or 10, characterized in that, The third photoelectric regeneration module includes: An uplink receiver, wherein the first port of the uplink receiver is the second port of the third optoelectronic regeneration module, used to convert the second type PON uplink optical signal into an uplink electrical signal; An uplink signal processing subunit, wherein the first port of the uplink signal processing subunit is signal-connected to the second port of the uplink receiver, is used to process the uplink electrical signal to generate a second uplink electrical signal; An uplink LDD unit, wherein the first port of the uplink LDD unit is signal-connected to the second port of the uplink signal processing subunit, and is used to generate an uplink drive signal in response to the second uplink electrical signal; The first uplink transmitter has its first port connected to the second port of the uplink LDD unit. The second port of the first uplink transmitter is the second port of the third optoelectronic regeneration module. Under the drive of the uplink drive signal, the first uplink transmitter converts the second uplink electrical signal into a second type PON standard second uplink optical signal. A downlink receiver, wherein the downlink receiver is used to receive downlink optical signals; An uplink burst signal extraction unit, wherein the first end of the uplink burst signal extraction unit is connected to the downlink receiver signal, and is used to extract DBA information from the downlink optical signal; An uplink burst signal control subunit is provided. The first port of the uplink burst signal control subunit is connected to the second port of the uplink burst signal extraction unit, the second port is connected to the third port of the uplink receiver, the third port is connected to the third port of the first uplink transmitter, and the fourth port is connected to the third port of the uplink signal processing subunit. The uplink burst signal control subunit generates a reset signal and an uplink burst enable signal based on the DBA information, and sends the reset signal to the uplink receiver and the uplink signal processing subunit, and sends the uplink burst enable signal to the first uplink transmitter.

13. The optical network transmission apparatus according to claim 12, characterized in that, The uplink signal processing subunit includes an uplink DSP subunit or an uplink CDR subunit. The uplink DSP subunit is used to perform equalization processing on the uplink electrical signal, and the uplink CDR subunit is used to recover the clock of the uplink electrical signal.

14. The optical network transmission device according to claim 1, characterized in that, The optical distribution module includes a photoelectric conversion module, an optical splitter, a path selection module, and a second uplink transmitter; The first port of the photoelectric conversion module is connected to the fourth port of the first multiplexer / demultiplexer, and is used to convert the uplink optical signal into an uplink electrical signal. The first port of the path selection module is signal-connected to the second port of the photoelectric conversion module, and is used to process multiple uplink electrical signals; The first port of the second uplink transmitter is signal-connected to the second port of the path selection module, and is used to convert the processed uplink electrical signal into an uplink optical signal; The branch port of the optical splitter is connected to the third port of the first multiplexer / demultiplexer. The optical splitter is used to split the downlink optical signal and send the split downlink optical signal to the corresponding first multiplexer / demultiplexer. The optical network transmission device further includes: The second multiplexer / demultiplexer has its first port connected to the second port of the second uplink transmitter for transmitting the uplink optical signal to the second type of PON OLT port. An optical amplifier, wherein the first port of the optical amplifier is connected to the third port of the second multiplexer / demultiplexer, and the second port of the optical amplifier is connected to the first port of the optical splitter, for amplifying the downlink optical signal.

15. The optical network transmission apparatus according to claim 14, characterized in that, The path selection module includes an electrical combiner or a DSP chip, and the photoelectric conversion module includes: An uplink receiver, wherein the first port of the uplink receiver is the first port of the photoelectric conversion module, and the second port of the uplink receiver is signal-connected to the first port of the path selection module, and the uplink receiver is used to convert uplink optical signals into uplink electrical signals; An uplink burst signal control subunit is provided, wherein the first port of the uplink burst signal control subunit is connected to the third port of the uplink receiver for transmitting the SD signal generated by the uplink receiver; the second port of the uplink burst signal control subunit is connected to the third port of the second uplink transmitter for controlling the second uplink transmitter to turn on according to the SD signal.

16. The optical network transmission apparatus according to claim 15, characterized in that, The DSP chip includes: The data recovery and parsing module has its first port connected to the second port of the uplink receiver, and is used to perform data clock recovery and data parsing on the uplink electrical signal sent by the uplink receiver to obtain the data parsing result; The data reconstruction module has a first port that is signal-connected to the second port of the data recovery and parsing module, and the second port of the data reconstruction module is signal-connected to the first port of the second uplink transmitter. The data reconstruction module is used to reconstruct the data parsing results corresponding to different uplink receivers to obtain a single data stream.

17. The optical network transmission apparatus according to claim 14, characterized in that, The path selection module includes an electrical switch, and the photoelectric conversion module includes: An uplink receiver, wherein the first port of the uplink receiver is the first port of the photoelectric conversion module, and the second port of the uplink receiver is signal-connected to the first port of the path selection module, and the uplink receiver is used to convert uplink optical signals into uplink electrical signals; An uplink burst signal control subunit is provided, wherein a first port of the uplink burst signal control subunit is connected to a third port of the uplink receiver for transmitting the SD signal generated by the uplink receiver; a second port of the uplink burst signal control subunit is connected to a third port of the second uplink transmitter, and a third port of the uplink burst signal control subunit is connected to a third port of the electrical switch; the uplink burst signal control subunit is used to control the second uplink transmitter to turn on according to the SD signal.

18. The optical network transmission apparatus according to claim 17, characterized in that, The second uplink transmitter includes: LDD driver chip, used to generate uplink drive signal in response to uplink electrical signal; A laser, the control port of which is connected to the output port of the LDD driver chip, emits an optical signal under the control of the uplink drive signal; A DSP chip, wherein the first port of the DSP chip is signal-connected to the second port of the path selection module, and is used to perform equalization or pre-equalization processing on the uplink electrical signal; The CDR chip has its first port connected to the second port of the DSP chip, and its second port connected to the first port of the second combiner / demultiplexer, for recovering the clock of the uplink electrical signal.

19. The optical network transmission apparatus according to claim 14, characterized in that, The second type of PON OLT port includes: The third multiplexer / demultiplexer has its first port connected to the optical distribution module. The second type of PON transmitter has its first port connected to the second port of the multiplexer / demultiplexer for transmitting downlink optical signals. The second type of PON transmitter includes an optical amplification module and an optical transmission module. The optical amplification module is used to amplify the downlink optical signal, and the optical transmission module is used to send the amplified downlink optical signal to the third multiplexer / demultiplexer. An optical amplifier, wherein the first port of the optical amplifier is connected to the third port of the third multiplexer / demultiplexer, for amplifying the uplink optical signal; The second type of PON receiver has its first port connected to the second port of the optical amplifier for receiving the amplified uplink optical signal.

20. The optical network transmission device according to claim 1, characterized in that, It also includes a first type of optoelectronic regeneration module, which is disposed between the first type of PON standard OLT port and the first multiplexer / demultiplexer, and is used to compensate for the loss of the first type of PON standard optical signal.

21. The optical network transmission device according to claim 1, characterized in that, The first type of PON standard OLT port includes one or more of the following: a single PON standard OLT port, multiple PON standard OLT ports, and multiple PON standard Combo OLT ports. The single PON standard OLT port includes one or more of the following: Type I Gigabit Passive Optical Network (GPON), 10G Passive Optical Network (XGPON), or Symmetric 10G Passive Optical Network (XGS) PON port. And / or, the plurality of PON standard OLT ports include one or more of GPON ports, XG PON ports, and XGS PON ports; And / or, multiple PON standard Combo OLT ports include one or more of the following: independent GPON&XG PON Combo port, GPON&XGSPON Combo port, and GPON&XG PON&XGS PON Combo port.

22. The optical network transmission device according to claim 1, characterized in that, The second type of PON standard OLT port includes one or more of the following: a single PON standard OLT port, multiple PON standard OLT ports, and multiple PON standard Combo OLT ports; The single PON standard OLT port includes one or more of 50G PON symmetrical ports and 50G PON asymmetrical ports; The plurality of PON standard OLT ports include one or more of 50G PON ports and 200G PON ports; The plurality of PON standard Combo OLT ports include one or more of the following: GPON & XG port, PON & 50G PON Combo port, and 50GPON & 200G PON Combo port.

23. An optical network transmission method, characterized in that, Applied to the optical network transmission apparatus according to any one of claims 1-22, the method comprises: The system receives downlink optical signals of type 1 PON from at least one type 1 PON OLT port and transmits them to at least one type 1 PON ONU in an optical distribution network (ODN). It also receives uplink optical signals of type 1 PON from the at least one type 1 PON ONU in the ODN and transmits them to the corresponding type 1 PON OLT port. And / or, receive a Type II PON downlink optical signal sent by a Type II PON OLT port, split and transmit it to a Type II PON ONU in the at least one ODN; receive a Type II PON uplink optical signal sent by a Type II PON ONU in the at least one ODN, and combine and output it to a Type II PON OLT port.

24. An optical network system, characterized in that, include: Multiple Type I Passive Optical Network (PON) optical line terminals (OLTs); A Type II PON OLT; Multiple optical distribution networks (ODNs); An optical network transmission device, wherein a first end of the optical network transmission device is connected to a first type PON standard OLT signal via a first type PON standard OLT port, and is connected to a second type PON standard OLT signal via a second type PON standard OLT port; a second end of the optical network transmission device is connected to a first end signal of the plurality of ODN networks; the optical network transmission device includes the optical network transmission device according to any one of claims 1 to 22.

25. The optical network system according to claim 24, characterized in that, The optical network transmission device is located in the OLT, or between the OLT and the ODN network.

26. The optical network system according to claim 24, characterized in that, The ODN is equipped with a first type of PON optical network unit (ONU) and a second type of PON optical network unit (ONU).

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