User end device, network device, and signal transmission method and system

Abstract

The present application relates to the technical field of optical communications. Provided are a user end device, a network device, and a signal transmission method and system. The user end device comprises: a processing circuit, which is used for outputting a service signal having a first frequency and a first management signal having a second frequency, wherein the first frequency is greater than the second frequency; and an optical module, which is used for transmitting the service signal by means of a first transmission power and transmitting the first management signal by means of a second transmission power, wherein the first transmission power is greater than the second transmission power. In this way, the management signal is transmitted in a low-frequency and low-power form, and the user end device can reuse an existing transmitter in the optical module to transmit the management signal, thereby reducing the power, volume and cost of the user end device.

Description

User terminal device, network device, signal transmission method and system

[0001] The present application claims priority to the Chinese patent application No. 202410735434.X, filed on June 6, 2024, and entitled "User terminal device, network device, signal transmission method and system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication technology, and in particular to a user terminal device, a network device, a signal transmission method and a system. BACKGROUND

[0003] With the acceleration of digital transformation process, there are demands for rate upgrade and cloud access for quality private lines, and higher requirements for network connection of private lines. The traditional point to point (P2P) private line has problems such as slow service opening, large fiber consumption, limited conditions of machine room, and high cost. As an optimization scheme, the optical transport network (OTN) point to multipoint (P2MP) private line can meet the requirements of large bandwidth, low latency, and fast opening in business buildings, video monitoring and other scenarios, and build differentiated quality services on the basis of wide coverage of optical distribution network (ODN).

[0004] In the current OTN P2MP private line service scenario, in order to realize high quality and safe and reliable characteristics, a double wavelength configuration and design is usually adopted, that is, the user terminal device and the local terminal device use two different wavelengths to transmit service signals and management signals, so that the transmission of service signals and management signals does not affect each other, so as to achieve the characteristics of low latency jitter of private line service. However, the double wavelength configuration and design will increase the power consumption, volume and cost of the device, especially when the number of user terminal devices increases, which will greatly increase the power consumption and network deployment cost of the entire network. SUMMARY

[0005] The present application provides a user terminal device, a network device, a signal transmission method and a system, which are used to reduce the power consumption, volume and cost of the device.

[0006] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, a user-side device is provided, which comprises: a signal output module, configured to output a service signal of a first frequency and a first management signal of a second frequency, the service signal can also be referred to as a service packet, the first management signal can also be referred to as a management packet, the first frequency is greater than the second frequency; and an optical module, configured to transmit the service signal by a first transmission power and transmit the first management signal by a second transmission power, the first transmission power is greater than the second transmission power.

[0008] In the technical solution described above, the frequency and the transmission power of the service signal transmitted by the user-side device are respectively greater than the frequency and the transmission power of the first management signal, that is, the first management signal can be transmitted in a form of low frequency and low power, so that the user-side device can reuse the original transmitter in the multiplexing optical module to transmit the management signal when the user-side device only supports single-wavelength transmission, thereby reducing the power, the size and the cost of the user-side device. Furthermore, when the number of user-side devices expands, the power consumption and the network deployment cost of the entire network can be greatly reduced.

[0009] In a possible implementation manner of the first aspect, the signal output module comprises: a service and management module, configured to output the service signal of the first frequency according to a synchronous clock signal and a time signal, and output the clock signal, the time signal and a second management signal; and a signal processing module, configured to process the second management signal according to the clock signal and the time signal, so as to output the first management signal of the second frequency. The clock signal and the time signal can be local signals of the service and management module, and can be used to indicate service time axis information of the service and management module. Optionally, the service signal is used to carry service information, and the first management signal and the second management signal are used to carry management information. In the possible implementation manner described above, the service and management module can be an original component in the user-side device that currently supports single-wavelength transmission, for example, the service and management module can be a service and management circuit, or a service and management module, and the signal processing module can be used to perform additional processing on the second management signal, so that the frequency of the finally transmitted first management signal is less than the frequency of the service signal.

[0010] In a possible implementation manner of the first aspect, the signal processing module is further configured to: determine service time axis information according to the clock signal and the time signal, the service time axis information being used to indicate frame period information of the service signal; and process the second management signal according to the service time axis information, so as to output the first management signal of the second frequency. In the possible implementation manner described above, the signal processing module can restore the service time axis information in the service and management module, and process the second management signal according to the service time axis information, so that the frequency of the finally transmitted first management signal is less than the frequency of the service signal.

[0011] In a possible implementation of the first aspect, the service and management module is further configured to output configuration information, the configuration information being used to indicate configuration parameters of the first management signal of the second frequency, for example, the configuration parameters indicated by the configuration information can include but are not limited to frequency, transmission period, transmission power, bias current value of LDD, frame format, or encoding mode, etc.; and the signal processing module is further configured to process the second management signal according to the clock signal, the time signal and the configuration parameters, to output the first management signal of the second frequency. In the possible implementation, the signal processing module can process the second management signal according to the configuration information output by the service and management module, so that the finally transmitted first management signal meets certain configuration parameters, and the corresponding frequency is less than the frequency of the service signal.

[0012] In a possible implementation of the first aspect, the service and management module is a media access control (MAC) chip.

[0013] In a possible implementation of the first aspect, the second transmission power is less than a preset power.

[0014] In a second aspect, a network device is provided, which includes: an optical module configured to receive a signal transmitted by a user-side device, and obtain a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency being greater than the second frequency, and the reception power of the service signal being greater than the reception power of the first management signal; and a signal receiving module configured to receive the service signal of the first frequency and the first management signal of the second frequency.

[0015] In the above technical solution, the optical module of the network device receives a signal including a service signal of a first frequency and a first management signal of a second frequency, the service signal and the first management signal can be transmitted by different user-side devices, and the first management signal is transmitted in a low-frequency and low-power form, so that the optical module can separate the service signal and the first management signal from the received signal, and the signal receiving module can process the service signal and the first management signal accordingly, so that the network device has lower power, volume and cost compared with a network device supporting dual wavelengths.

[0016] In a possible implementation of the second aspect, the signal receiving module comprises: a service and management module, configured to receive the service signal and output a synchronous clock signal and a time signal; and a signal processing module, configured to receive the first management signal, the clock signal and the time signal, and process the first management signal according to the clock signal and the time signal to output a second management signal; and the service and management module is further configured to receive the second management signal. Optionally, the service signal is used to carry service information, and the first management signal and the second management signal are used to carry management information. In the possible implementation, the service and management module can be a component in a network device that currently supports single-wavelength transmission, and the signal processing module can be used to perform additional processing on the second management signal to recover the second management signal corresponding to the service and management module.

[0017] In a possible implementation of the second aspect, the signal processing module is further configured to: determine service timeline information according to the clock signal and the time signal, the service timeline information being used to indicate frame period information of the service signal; and process the first management signal according to the service timeline information to output the second management signal.

[0018] In a possible implementation of the second aspect, the optical module is further configured to: perform low-pass filtering on the received signal to obtain the first management signal of the second frequency from the received signal. In the possible implementation, the optical module can separate the first management signal from the received signal by low-pass filtering, thereby avoiding the influence of the received service signal on the first management signal.

[0019] In a possible implementation of the second aspect, the optical module comprises: a receiver, configured to receive a signal sent by a user-side device; a mirror circuit, configured to mirror the received signal to output a first received signal; and a filter circuit, configured to perform low-pass filtering on the first received signal to output the first management signal of the second frequency. In the possible implementation, the optical module can separate the first management signal from the received signal by the mirror circuit and the filter circuit, thereby avoiding the influence of the received service signal on the first management signal.

[0020] In a possible implementation of the second aspect, the optical module comprises: a receiver, configured to receive a signal sent by a user-side device; a power splitter, configured to perform power splitting processing on the received signal to output a second received signal; and a filter circuit, configured to perform low-pass filtering on the second received signal to output the first management signal of the second frequency. In the possible implementation, the optical module can separate the first management signal from the received signal by the power splitter and the filter circuit, thereby avoiding the influence of the received service signal on the first management signal.

[0021] In a possible implementation of the second aspect, the service and management module is a media access control (MAC) chip.

[0022] In a third aspect, a signal transmission method is provided. The method is applied to a user-side device, and includes: outputting a service signal of a first frequency and a first management signal of a second frequency, the first frequency being greater than the second frequency; transmitting the service signal by a first transmission power and transmitting the management signal by a second transmission power, the first transmission power being greater than the second transmission power.

[0023] In a possible implementation of the third aspect, the outputting of the service signal of the first frequency and the first management signal of the second frequency includes: outputting the service signal of the first frequency according to a synchronized clock signal and a time signal, and outputting the clock signal, the time signal and a second management signal; and processing the second management signal according to the clock signal and the time signal to output the first management signal of the second frequency.

[0024] In a possible implementation of the third aspect, the processing of the second management signal according to the clock signal and the time signal includes: determining service timeline information according to the clock signal and the time signal; and processing the second management signal according to the service timeline information.

[0025] In a possible implementation of the third aspect, the method further includes: outputting configuration information, the configuration information being used to indicate a configuration parameter of the first management signal of the second frequency; and the processing of the second management according to the clock signal and the time signal includes: processing the second management signal according to the clock signal, the time signal and the configuration parameter.

[0026] In a possible implementation of the third aspect, the second transmission power is less than a preset power.

[0027] In a fourth aspect, a signal transmission method is provided. The method is applied to a network device, and includes: receiving a signal transmitted by a user-side device; and obtaining a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency being greater than the second frequency, and a reception power of the service signal being greater than a reception power of the first management signal. Optionally, the network device is a local-side device.

[0028] In a possible implementation of the fourth aspect, the method further includes: outputting a synchronized clock signal and a time signal; and receiving the clock signal and the time signal, and processing the first management signal according to the clock signal and the time signal to output a second management signal.

[0029] In a possible implementation form of the fourth aspect, processing the first management signal according to the clock signal and the time signal to output the second management signal comprises: determining service timeline information according to the clock signal and the time signal, the service timeline information being used to indicate frame period information of the service signal; and processing the first management signal according to the service timeline information to output the second management signal.

[0030] In a possible implementation form of the fourth aspect, obtaining the first management signal of the second frequency from the received signal comprises: performing low-pass filtering on the received signal to obtain the first management signal of the second frequency from the received signal.

[0031] In a fifth aspect, a user-side device is provided, which comprises a processor and a memory, the memory storing instructions, when the processor executes the instructions in the memory, causing the user-side device to perform the signal transmission method provided in the third aspect or any possible implementation form of the third aspect.

[0032] In a sixth aspect, a network device is provided, which comprises a processor and a memory, the memory storing instructions, when the processor executes the instructions in the memory, causing the network device to perform the signal transmission method provided in the fourth aspect or any possible implementation form of the fourth aspect.

[0033] In a seventh aspect, an optical communication system is provided, which comprises: a user-side device and a network device; wherein the user-side device is the user-side device provided in the first aspect or any possible implementation form of the first aspect, or the fifth aspect; and the network device is the network device provided in the second aspect or any possible implementation form of the second aspect, or the sixth aspect.

[0034] In an eighth aspect, a computer-readable storage medium is provided, which comprises instructions; when the instructions are run on a processor, causing the processor to perform the signal transmission method provided in the third aspect or any possible implementation form of the third aspect.

[0035] In a ninth aspect, a computer-readable storage medium is provided, which comprises instructions; when the instructions are run on a processor, causing the processor to perform the signal transmission method provided in the fourth aspect or any possible implementation form of the fourth aspect.

[0036] In a tenth aspect, a computer program product is provided, which comprises a computer program, when the computer program is run on a device, causing the device to perform the signal transmission method provided in the third aspect or any possible implementation form of the third aspect.

[0037] In an eleventh aspect, a computer program product is provided, which comprises a computer program, and when the computer program is run on a device, the device is caused to perform the signal transmission method according to the fourth aspect or any possible implementation of the fourth aspect.

[0038] It can be understood that the beneficial effects of the other aspects besides the first aspect and any possible implementation of the first aspect and the second aspect and any possible implementation of the second aspect can be correspondingly referred to the beneficial effects described above, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 is a schematic diagram of transmitting service signals and management signals by using dual wavelengths according to an embodiment of the present application;

[0040] Fig. 2 is a schematic diagram of a structure of an optical communication system according to an embodiment of the present application;

[0041] Fig. 3 is a schematic diagram of a structure of a user-side device and a network device according to an embodiment of the present application;

[0042] Fig. 4 is a schematic diagram of processing a second management signal according to an embodiment of the present application;

[0043] Fig. 5 is a waveform diagram of signals involved in receiving signals according to an embodiment of the present application;

[0044] Fig. 6 is a schematic diagram of a structure of an optical module in a network device according to an embodiment of the present application;

[0045] Fig. 7 is a schematic diagram of filtering processing of receiving signals according to an embodiment of the present application;

[0046] Fig. 8 is a flowchart of a signal transmission method according to an embodiment of the present application;

[0047] Fig. 9 is a flowchart of another signal transmission method according to an embodiment of the present application;

[0048] Fig. 10 is a schematic diagram of a structure of a user-side device according to an embodiment of the present application;

[0049] Fig. 11 is a schematic diagram of a structure of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] The making and using of various embodiments will now be described in detail. It should be appreciated that many of the inventive concepts disclosed herein can be embodied in a variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the application and the technology.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0052] Circuits or other components can be described as or said to be "configured to" perform a task or tasks, in instances of this scenario, "configured to" has one or more of the following meanings: as one of ordinary skill in the art would understand the term to mean; as disclosed in a court of law interpretation of the term; as either party in a court of law would agree the term conveys.

[0053] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship of the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can represent a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0054] The embodiments of the present application use "first" and "second" and the like to distinguish objects or functions or roles similar in name, and those skilled in the art can understand that "first" and "second" and the like do not limit the quantity and execution order. The word "coupled" is used to represent electrical connection, including direct connection through a wire or connection end or indirect connection through other devices. Therefore, "coupled" should be regarded as a broad sense of electronic communication connection.

[0055] It should be noted that in the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or advantageous than other embodiments or design schemes. Rather, the use of the words "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0056] Before introducing the embodiments of the present application, first, the related technologies involved in the present application will be introduced and described.

[0057] With the acceleration of the digital transformation process, there are demands for rate upgrade and cloud access of quality private lines, and higher requirements for network connection of private lines. Traditional point to point (P2P) private lines have problems such as slow service opening, large fiber consumption, limited conditions of machine room, and high cost. As an optimization scheme, optical transport network (OTN) point to multipoint (P2MP) private line can meet the requirements of large bandwidth, low latency, and fast opening in business buildings, video monitoring and other scenarios on the basis of wide coverage of optical distribution network (ODN), and can build differentiated quality services.

[0058] The 5A quality mentioned above can include high availability, physical isolation, all-online, agility, and latency assurance. The high availability can refer to a link availability higher than 99.99%. The physical isolation can also be referred to as hard pipe isolation, which refers to hard pipe isolation between services. All-online refers to real-time visibility of network resources, accurate network usage status, realization of private line e-commerce operation, and full-process online. Agility can refer to "day" level service opening time, "minute" level online adjustment, and completely lossless service. The latency assurance can refer to detectable, visible, and planable private line latency.

[0059] In the current OTN P2MP private line service scenario, in order to realize the characteristics of high quality, safety and reliability, a double-wavelength configuration and design is usually adopted, that is, the customer premises equipment (CPE) and the central office equipment (COE) both use two different wavelengths to transmit service signals and management signals. The service signal can also be referred to as a service message, and the management signal can also be referred to as a management message. For example, as shown in FIG. 1, the customer premises equipment and the central office equipment can be connected through an optical fiber, and the customer premises equipment and the central office equipment both include two transceiver modules (or two transceiver channels), a first transceiver module in the two transceiver modules is used to transmit service signals through wavelength 1, and a second transceiver module is used to transmit management signals through wavelength 2, which can be used for the registration of the user equipment online. Wherein, the wavelength 1 and the wavelength 2 are different, and the wavelength 1 and the wavelength 2 can transmit the service signal and the management signal through the wavelength division multiplexing (WDM) mode.

[0060] In the traditional passive optical network (PON), a 250us time delay needs to be periodically introduced for transmitting the management signal to realize the registration of the new user online, that is, the transmission of the management signal in the traditional PON will affect the transmission time delay of the service signal. However, in the above scheme, the management signal is transmitted through an independent wavelength and will not affect the transmission of the service signal, so that the transmission of the service signal and the management signal does not affect each other, so that the scheme can realize the characteristics of low time delay jitter of the private line service. However, the double-wavelength configuration and design will increase the size and cost of the customer premises equipment, especially when the number of customer premises equipment is expanded, which will greatly increase the network deployment cost of the entire network.

[0061] Based on this, the embodiments of the present application provide a customer premises equipment, a central office equipment, a signal transmission method and system, which can be used to realize low time delay jitter of the service while realizing the transmission of the service signal and the management signal through the same wavelength (or the same transceiver module or transceiver channel), so as to reduce the cost of the customer premises equipment and the central office equipment, and reduce the cost of the optical communication network. The structure of the optical communication network, the customer premises equipment and the central office equipment involved in the embodiments of the present application will be introduced and described below.

[0062] FIG. 2 is a structure diagram of an optical communication system provided by the embodiment of the present application. The optical communication system can also be referred to as an optical communication network. The optical communication system can be a point-to-multipoint (P2MP) optical communication system. The optical communication system can be an optical transport network (OTN), a passive optical network (PON), or a metropolitan area network (MAN), etc. The optical communication system includes at least one user-side device and a network-side device. The at least one user-side device and the network-side device can communicate with each other. In FIG. 2, the number of the at least one user-side device is multiple, and the multiple user-side devices are denoted as CPE1 to CPEn for example. n is an integer greater than 1.

[0063] In the embodiment, the user-side device can also be referred to as a customer premises equipment or a user-side device, and the network-side device can also be referred to as a network-side device (network device). Optionally, the at least one user-side device and the network-side device can be connected by one or more optical fibers. The at least one user-side device and the network-side device can communicate with each other through the optical fibers, such as transmitting service signals and management signals through the optical fibers. The network-side device can be an optical transport device.

[0064] In a possible embodiment, the network-side device can communicate with the at least one user-side device by using a fixed time slot allocation mechanism. For example, the network-side device can allocate different time slots to different user-side devices in the at least one user-side device. Each user-side device can only transmit data to the network-side device in the allocated time slot. In this way, the conflict and interference between different user-side devices can be avoided, time slot isolation of service data can be achieved, the process of bandwidth time slot application, negotiation, and allocation can be eliminated, the data transmission delay can be reduced, and the jitter introduced by dynamic bandwidth time slots can be eliminated.

[0065] Further, although not shown, the optical communication system can further include other devices or networks. For example, the optical communication system can further include an optical splitter between the at least one user-side device and the network-side device. For another example, the optical communication system can further include a metropolitan OTN and a trunk OTN. The network-side device can be connected to the metropolitan OTN through an OTN interface. The metropolitan OTN can be connected to the trunk OTN. It can be understood that the structure of the optical communication system provided above is only exemplary and does not limit the embodiments of the present application.

[0066] FIG. 3 is a structure diagram of a user-side device and a network device provided by the embodiment of the present application. The user-side device and the network device can be connected by an optical fiber. The user-side device and the network device can support single-wavelength transmission. That is, the user-side device and the network device can transmit service signals and management signals through an optical signal of a single wavelength (i.e., the same wavelength). The structure of the user-side device will be introduced first.

[0067] As shown in FIG. 3, the user terminal device comprises a signal output module 11 and an optical module 12, wherein an output end of the signal output module 11 is connected with an input end of the optical module 12. The signal output module 11 is configured to output a service signal of a first frequency and a first management signal of a second frequency, wherein the first frequency is greater than the second frequency. The optical module 12 is configured to receive the service signal and the first management signal, and transmit the service signal by a first transmission power and transmit the first management signal by a second transmission power, wherein the first transmission power is greater than the second transmission power. Optionally, the optical module 12 comprises a transmitter, and the transmitter is configured to transmit the service signal by the first transmission power and transmit the first management signal by the second transmission power.

[0068] In the present application, the service signal can also be referred to as a service packet, and is configured to carry service information. The first management signal can also be referred to as a management packet, and is configured to carry management information. The first frequency is greater than the second frequency, i.e. the frequency of the service signal is greater than the frequency of the first management signal, or the frequency of the first management signal is less than the frequency of the service signal. In this way, the transmission period of the first management signal is greater than the transmission period of the service signal. For example, the frequency of the service signal can be 120 MHz or 160 MHz, and the frequency of the first management signal can be 40 MHz or 30 MHz.

[0069] In addition, the optical module 12 can adjust or control the transmission power of an output optical signal, such as by adjusting the bias current value of a laser diode driver (LDD) in the transmitter, so as to adjust the transmission power of the optical signal, which can be configured to carry the service signal or the first management signal. The first transmission power is greater than the second transmission power, i.e. the transmission power of the optical signal carrying the service signal is greater than the transmission power of the optical signal carrying the first management signal, or the transmission power of the optical signal carrying the first management signal is less than the transmission power of the optical signal carrying the service signal. For example, the second transmission power can be -25 dBm, and the first transmission power can be -5 dBm. Optionally, the second transmission power is less than a preset power, which can be set in advance according to requirements, such as -20 dBm.

[0070] Optionally, the working mode of the user equipment can include a service mode and a management mode. In the management mode, the user equipment transmits the first management signal, and in the process that the optical module 12 transmits the first management signal by the second transmission power, the service channel in the optical module 12 can be in a closed state. In the service mode, the user equipment transmits the service signal, and in the process that the optical module 12 transmits the service signal by the first transmission power, the management channel in the optical module 12 can be in a closed state. In actual application, the service mode and the management mode are not coexistent, for example, before the user equipment normally works, the user equipment can be in the management mode to realize functions such as registration and online, and after the user equipment completes the process, the user equipment can be switched to the service mode to transmit service data.

[0071] The signal output module 11 can be an integrated circuit structure or can include multiple independent circuit structures. The following is described by taking the signal output module 11 including multiple independent circuit structures as an example.

[0072] In a possible embodiment, the signal output module 11 includes a service and management module 111 and a signal processing module 112. The first output end of the service and management module 111 is connected with the first input end of the optical module 12, the second output end of the service and management module 111 is connected with the input end of the signal processing module 112, and the output end of the signal processing module 112 is connected with the second input end of the optical module 12. Optionally, the service and management module 111 can be a component in the user equipment that currently supports single-wavelength transmission, for example, the service and management module 111 is a media access control (MAC) chip.

[0073] In the user equipment, the service and management module 111 is configured to output the service signal of the first frequency according to the synchronous clock signal and time signal, and output the clock signal, the time signal and the second management signal to the signal processing module 112. For example, the service and management module 111 outputs the service signal of the first frequency to the optical module 12, and outputs the clock signal, the time signal and the second management signal to the signal processing module 112.

[0074] The clock signal and the time signal can be local signals of the service and management module 111, and can be used to indicate time axis information local to the service and management module 111, which can also be referred to as service time axis information. The clock signal can also be referred to as a synchronous clock signal, and the time signal can also be referred to as a synchronous time signal. The time signal can be used to indicate time information of a certain granularity, for example, the time signal can be a periodic pulse signal, and the time length between any two adjacent pulses in the pulse signal can be 1 ms or 0.5 ms, etc. The clock signal can be a signal quantity with a fixed frequency, for example, the clock signal can be a square wave signal with a fixed frequency.

[0075] In a possible example, the service and management module 111 can be configured to generate the service signal of the first frequency according to the clock signal and the time signal, and output the service signal to the optical module 12, and the transmission period corresponding to the clock signal can be the transmission period of the service signal. In another possible example, the service and management module 111 is further configured to generate a second management signal according to the clock signal and the time signal, and output the clock signal, the time signal and the second management signal to the signal processing module 112.

[0076] In the user terminal device, the signal processing module 112 is configured to receive the clock signal, the time signal and the second management signal, and process the second management signal according to the clock signal and the time signal to output the first management signal of the second frequency. Optionally, the signal processing module 112 is further configured to determine service time axis information according to the clock signal and the time signal, the service time axis information being used to indicate frame period information of the service signal, for example, being used to indicate the starting time of each frame in the service signal; and process the second management signal according to the service time axis information to output the first management signal of the second frequency. For example, the signal processing module 112 can perform clock tracking on the clock signal to generate a synchronous clock signal, and perform synchronous waveform processing on the time signal to use the time signal as a counter synchronization signal, and use a counter to count the synchronous clock signal to determine the service time axis information, so as to restore the service time axis information in the service and management module 111.

[0077] Optionally, the service and management module 111 is further configured to output configuration information, the configuration information being used to indicate configuration parameters of the first management signal of the second frequency, for example, the configuration parameters indicated by the configuration information can include but are not limited to frequency, transmission period, transmission power, bias current value of LDD, frame format, or encoding mode, etc. Correspondingly, the signal processing module 112 is further configured to process the second management signal according to the clock signal, the time signal and the configuration parameters, to output the first management signal of the second frequency.

[0078] In a possible example, as shown in FIG. 4, the signal processing module 112 can be specifically configured to perform clock tracking on the clock signal to generate a synchronized clock signal, and perform synchronous waveform processing on the time signal to output the time signal as a counter synchronization signal, and use a counter to count the synchronized clock signal to determine the service time axis information. Then, according to the synchronized clock signal, the service time axis information and the configuration parameters, etc., the second management signal is processed by frequency division configuration, frame length configuration, framing and encoding, etc., to output the first management signal. The specific process of processing the second management signal as described above can refer to the detailed description in the related art, and the embodiments of the present application will not be described in detail here.

[0079] In the user terminal device provided by the embodiments of the present application, the signal output module 11 can be configured to output the service signal of the first frequency and the first management signal of the second frequency, the first frequency being greater than the second frequency, and the optical module 12 can be configured to transmit the service signal by the first transmission power and transmit the first management signal by the second transmission power, the first transmission power being greater than the second transmission power. That is, the frequency and transmission power of the service signal transmitted by the user terminal device are respectively greater than the frequency and transmission power of the first management signal, that is, the first management signal can be transmitted in the form of low frequency and low power, so that the user terminal device can reuse the original transmitter in the optical module to transmit the management signal when only single-wavelength transmission is supported, thereby reducing the power, volume and cost of the user terminal device.

[0080] After introducing the structure of the user terminal device, the structure of the network device will be introduced first. Optionally, the network device can be a local terminal device.

[0081] As shown in FIG. 3, the network device comprises an optical module 21 and a signal receiving module 22, an output end of the optical module 21 is connected with an input end of the signal receiving module 22. The optical module 21 is configured to receive or acquire a signal sent by a user-side device, the received signal can be referred to as a received signal, the received signal is an optical signal; acquire a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency is greater than the second frequency, a received power of the service signal is greater than a received power of the first management signal. The signal receiving module 22 is configured to receive the service signal of the first frequency and the first management signal of the second frequency. Optionally, the optical module 21 is further configured to perform low-pass filtering on the received signal to acquire the first management signal of the second frequency from the received signal.

[0082] Wherein, the related description about the service signal of the first frequency and the first management signal of the second frequency can refer to the related description in the structure of the user-side device, and the embodiments of the present application will not be repeated here.

[0083] In addition, the above network device can communicate with one user-side device, or can communicate with multiple user-side devices. When the network device communicates with multiple user-side devices, there can be a case that one user-side device sends a first management signal to the network device at the same time as other user-side devices send service signals (referred to as other online service signals) in different time slots, so that the first management signal and the other online service signals have been mixed in time and frequency when transmitted to the network device. That is, the received signal acquired by the optical module 21 can include the service signal of the first frequency and the first management signal of the second frequency.

[0084] For example, FIG. 5 shows a waveform diagram of signals involved in the received signal of the network device. FIG. 5(a) shows a waveform diagram of a first management signal sent by a certain user-side device and other online service signals sent by other user-side devices, the horizontal coordinate represents time t, and the vertical coordinate represents signal amplitude or power. FIG. 5(b) shows a waveform diagram of the first management signal and the other online service signals in the received signal, the horizontal coordinate represents frequency f, and the vertical coordinate represents signal amplitude or power. The first management signal in the above FIG. 5 is taken as a square wave signal, and the time and corresponding amplitude or power of the other online service signals sent by different user-side devices are different.

[0085] Further, the optical module 21 can be implemented in various ways when acquiring the service signal of the first frequency and the first management signal of the second frequency from the received signal, which will be described below by taking the structures of the optical module shown in FIG. 6(a) and (b) as examples.

[0086] In a possible embodiment, as shown in (a) of FIG. 6, the optical module 21 includes a receiver 211, a mirror module 212 and a filter module 213. The first output end of the receiver 211 is connected to the input end of the mirror module 212, and the output end of the mirror module 212 is connected to the input end of the filter module 213.

[0087] For example, the receiver 211 is configured to obtain the received signal, the mirror module 212 is configured to mirror the received signal to output a first received signal, and the filter module 213 is configured to perform low-pass filtering on the first received signal to output the first management signal of the second frequency. Optionally, the mirror module 212 can be a current mirror, and the filter module 213 can be a filter. For example, FIG. 7 shows a schematic diagram of the first management signal obtained by performing low-pass filtering on the received signal. The received signal can include the first management signal and other online service signals. In FIG. 7, the horizontal axis f represents frequency, and the vertical axis represents amplitude or power.

[0088] Optionally, the optical module 21 can further include a physical layer (PHY) 214, and the input end of the physical layer 214 is connected to the second output end of the receiver 211. The physical layer 214 can be configured to receive the received signal output by the receiver 211 and process the received signal to obtain the service signal of the first frequency. For details of the process of processing the received signal by the physical layer 214 to obtain the service signal, refer to the detailed description in the related art, which will not be described in detail herein.

[0089] In another possible embodiment, as shown in (b) of FIG. 6, the optical module 21 includes a receiver 211, a power divider 215 and a filter module 213. The output end of the receiver 211 is connected to the input end of the power divider 215, and the first output end of the power divider 215 is connected to the input end of the filter module 213. Optionally, the filter module 213 can be a filter.

[0090] For example, the receiver 211 is configured to obtain the received signal, the power divider 215 is configured to perform power division processing on the received signal to output a second received signal, and the filter module 213 is configured to perform low-pass filtering on the second received signal to output the first management signal of the second frequency.

[0091] Optionally, the optical module 21 can further include a physical layer 214, an input end of the physical layer 214 being connected with a second output end of the power splitter 215. The power splitter 215 is further configured to perform power splitting processing on the received signal to output the second received signal and a third received signal. The physical layer 214 is configured to receive the third received signal and process the third received signal to obtain the service signal of the first frequency. The specific process of processing the third received signal to obtain the service signal by the physical layer 214 can refer to the detailed description in the related art, and will not be described in detail herein. Further, the optical module 21 can further include other modules, for example, the optical module 21 further includes a mirror module 212.

[0092] Optionally, the first management signal obtained by the low-pass filtering of the optical module 21 can further include part of the service signal, and in this case, the signal receiving module 22 can perform some processing on the first management signal, for example, decoding processing, to remove the part of the service signal in the first management signal.

[0093] Further, the signal receiving module 22 can be an integrated circuit structure or include multiple independent circuit structures. Hereinafter, the signal receiving module 22 is taken as an example including multiple independent circuit structures for description.

[0094] In a possible embodiment, as shown in FIG. 3, the signal receiving module 22 includes a service and management module 221 and a signal processing module 222. A first output end of the optical module 21 is connected with an input end of the service and management module 221, a second output end of the optical module 21 is connected with an input end of the signal processing module 222, and an input-output end of the service and management module 221 is connected with an input-output end of the signal processing module 222. Optionally, the service and management module 221 can be a component in the current network device, for example, the service and management module 221 is a MAC chip.

[0095] The service and management module 221 is configured to receive the service signal and output a synchronous clock signal and a time signal. The signal processing module 222 is configured to receive the first management signal, the clock signal and the time signal, and process the first management signal according to the clock signal and the time signal to output a second management signal. The service and management module 221 is further configured to receive the second management signal. Further, after receiving the service signal and the second management signal, the service and management module 221 is further configured to process the service signal and the second management signal to obtain service data in the service signal and management information in the second management signal.

[0096] The clock signal and the time signal output by the service and management module 221 can be local signals of the service and management module 221, and can be used to indicate time axis information of the service and management module 221, which can also be referred to as service time axis information. The time signal can be used to indicate time information of a certain granularity, for example, the time signal can be a periodic pulse signal, and the time length between any two adjacent pulses in the pulse signal can be 0.3 ms, 0.2 ms, or 0.1 ms, etc. The clock signal can be a signal quantity with a fixed frequency, for example, the clock signal can be a square wave signal with a fixed frequency. In actual application, the granularity of the time information indicated by the time signal output by the service and management module 221 in the network device can be greater than the granularity of the time information indicated by the time signal output by the service and management module 111 in the user terminal device.

[0097] In a possible example, the signal processing module 222 processes the first management signal according to the clock signal and the time signal, which can include that the signal processing module 222 determines service time axis information according to the clock signal and the time signal, the service time axis information being used to indicate frame period information of the service signal, for example, being used to indicate the starting time of each frame in the service signal; and processes the first management signal according to the service time axis information to output a second management signal. For example, the signal processing module 222 can be used to perform clock tracking on the clock signal to generate a synchronized clock signal, and perform synchronous waveform processing on the time signal to use the time signal as a counter synchronization signal, and use a counter to count the synchronized clock signal to determine the service time axis information, so as to restore the service time axis information in the service and management module 221. Further, the signal processing module 222 is further used to decode and frame the first management signal when receiving the first management signal.

[0098] Optionally, the time signal output by the service and management module 221 in the network device can also carry marking information, which can be used to indicate the starting time of a certain downlink service frame, i.e., the time at which the starting position of the service frame is located. The signal processing module 222 is further used to, after determining the service time axis information, perform distance measurement on the user terminal device according to the starting time of the service frame corresponding to the service time axis information and the marking information. In this way, the network device can assign appropriate delay parameters to the user terminal device according to the measured distance, so as to ensure that the data of the user terminal device does not conflict in time with other user terminal devices.

[0099] In the embodiment of the present application, the optical module 21 in the network device acquires the received signal including the service signal of the first frequency and the first management signal of the second frequency, the service signal and the first management signal can be sent by different user-side devices, and the first management signal is in the form of low frequency and low power, so that the optical module 21 can separate the service signal and the first management signal from the received signal, and the signal receiving module 22 can process the service signal and the first management signal, thereby reducing the power, volume and cost of the network device compared with the network device supporting dual-wavelength.

[0100] In another aspect of the present application, the embodiment of the present application further provides a signal transmission method, which can be applied to a user-side device, and the structure of the user-side device can refer to the description above. As shown in FIG. 8, the method comprises:

[0101] S301. The signal output module outputs the service signal of the first frequency and the first management signal of the second frequency, the first frequency being greater than the second frequency.

[0102] S302. The optical module transmits the service signal by the first transmission power and transmits the management signal by the second transmission power, the first transmission power being greater than the second transmission power. The second transmission power is less than the preset power.

[0103] In a possible embodiment, the signal output module outputs the service signal of the first frequency and the first management signal of the second frequency, comprising: the service and management module outputs the service signal of the first frequency according to the synchronized clock signal and time signal, and outputs the clock signal, the time signal and the second management signal; and the signal processing module processes the second management signal according to the clock signal and the time signal to output the first management signal of the second frequency.

[0104] Optionally, the signal processing module processes the second management signal according to the clock signal and the time signal, comprising: the signal processing module determines the service time axis information according to the clock signal and the time signal, the service time axis information being used to indicate the frame period information of the service signal, such as the starting time of each frame in the service signal; and processes the second management signal according to the service time axis information.

[0105] Further, the method further comprises: the service and management module outputs configuration information, the configuration information being used to indicate the configuration parameter of the first management signal of the second frequency; and correspondingly, the signal processing module processes the second management according to the clock signal and the time signal, comprising: the signal processing module processes the second management signal according to the clock signal, the time signal and the configuration parameter.

[0106] In yet another aspect of the present application, the embodiments of the present application further provide a signal transmission method, which can be applied to a network device. The structure of the network device can refer to the description above. As shown in FIG. 9, the method comprises the following steps: S401. The optical module receives a signal sent by a user-side device, and obtains a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency being greater than the second frequency, and the received power of the service signal being greater than the received power of the first management signal; S402. The signal receiving module receives the service signal of the first frequency and the first management signal of the second frequency.

[0107] In a possible embodiment, the signal receiving module receiving the service signal of the first frequency and the first management signal of the second frequency comprises: the service and management module receiving the service signal and outputting a synchronous clock signal and a time signal; the signal processing module receiving the first management signal, the clock signal and the time signal, and processing the first management signal according to the clock signal and the time signal to output a second management signal; and the service and management module receiving the second management signal.

[0108] Optionally, the signal processing module processing the first management signal according to the clock signal and the time signal to output a second management signal comprises: the signal processing module determining service time axis information according to the clock signal and the time signal, the service time axis information being used to indicate frame period information of the service signal, such as being used to indicate the starting time of each frame in the service signal; and the signal processing module processing the first management signal according to the service time axis information to output a second management signal.

[0109] Based on this, in another aspect of the present application, a user-side device is also provided, as shown in FIG. 10, which comprises a processor 501, a memory 502, a transceiver 503 and a bus 504; wherein the processor 501, the memory 502 and the transceiver 503 are connected through the bus 504. The transceiver 503 can comprise a transmitter and a receiver, and the transceiver can also be referred to as a communication interface or an interface circuit.

[0110] The processor 501 is configured to control and manage the actions of the user-side device. In a possible embodiment, the processor 501 can be configured to support the user-side device to perform S301-S302 in the above method embodiments, and / or other technical processes described herein; and the transceiver 503 is configured to support the user-side device to communicate, such as supporting the device to communicate with a network device.

[0111] In the embodiments of the present application, the processor 501 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It can implement or execute the various exemplary logical blocks, modules and circuits described in combination with the disclosure of the present application. The processor can also be a combination of implementing computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like. The above bus 504 can include an address bus, a data bus, a control bus, and the like.

[0112] In another aspect of the present application, a network device is also provided, as shown in FIG. 11, which includes a processor 601, a memory 602, a transceiver 603 and a bus 604; wherein the processor 601, the memory 602 and the transceiver 603 are connected through the bus 604. The above transceiver 603 can include a receiver and a transmitter, and the transceiver can also be referred to as a communication interface or an interface circuit.

[0113] The processor 601 is configured to control and manage the actions of the network device. In a possible embodiment, the processor 601 can be configured to support the network device to perform S401-S402 in the above method embodiments, and / or other technical processes described herein; and the transceiver 603 is configured to support the network device to communicate, such as supporting the network device to communicate with the user terminal device.

[0114] In the embodiments of the present application, the processor 601 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It can implement or execute the various exemplary logical blocks, modules and circuits described in combination with the disclosure of the present application. The processor can also be a combination of implementing computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like. The above bus 604 can include an address bus, a data bus, a control bus, and the like.

[0115] In another aspect of the present disclosure, there is also provided an optical communication system comprising a network device and one or more user-side devices; wherein the network device can be the network device provided above and configured to perform the steps in the method embodiments corresponding to the network device; and the one or more user-side devices can comprise the user-side devices provided above and configured to perform the steps in the method embodiments corresponding to the user-side devices.

[0116] It can be understood that all the related contents of the above-mentioned embodiments of the user-side devices and all the related contents of the above-mentioned embodiments of the network devices can be incorporated into the above-mentioned method embodiments and the embodiments of the optical communication system, which will not be repeated here.

[0117] In several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method can be implemented by other means. For example, the above-described apparatus embodiments are only illustrative, and for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed.

[0118] The units described as separate components can or can not be physically separate, and the components shown as units can be one physical unit or multiple physical units, i.e., can be located in one place or distributed to multiple different places. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0119] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium, which can include a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various storage medium that can store program codes. Based on such understanding, the technical solutions of the embodiments of the present disclosure essentially or the parts that make contributions to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product.

[0120] In another embodiment of the present disclosure, there is also provided a readable storage medium having computer-executable instructions stored therein, which are executed by a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to perform the steps of the network device in the above-mentioned method embodiments.

[0121] In another embodiment of the present disclosure, there is also provided a readable storage medium having computer-executable instructions stored therein, which are executed by a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to perform the steps of the user-side device in the above-mentioned method embodiments.

[0122] In yet another embodiment of the present application, a computer program product is also provided, which includes computer instructions stored in a readable storage medium; at least one processor of a device can read the computer instructions from the readable storage medium, and the at least one processor executes the computer instructions to make the device perform the steps of the network device in the above method embodiments.

[0123] In yet another embodiment of the present application, a computer program product is also provided, which includes computer instructions stored in a readable storage medium; at least one processor of a device can read the computer instructions from the readable storage medium, and the at least one processor executes the computer instructions to make the device perform the steps of the user terminal device in the above method embodiments.

[0124] Finally, it should be noted that the above is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A user equipment, the user equipment comprising: The user terminal device comprises: a signal output module, configured to output a service signal of a first frequency and a first management signal of a second frequency, the first frequency being greater than the second frequency; an optical module, configured to transmit the service signal by a first transmission power and transmit the first management signal by a second transmission power, the first transmission power being greater than the second transmission power.

2. The user equipment of claim 1, wherein, The signal output module comprises: a service and management module, configured to output the service signal of the first frequency according to a synchronized clock signal and a time signal, and output the clock signal, the time signal and a second management signal; a signal processing module, configured to process the second management signal according to the clock signal and the time signal, so as to output the first management signal of the second frequency.

3. The user equipment of claim 2, wherein, The signal processing module is further configured to: determine service timeline information according to the clock signal and the time signal, the service timeline information being used to indicate frame period information of the service signal; and process the second management signal according to the service timeline information, so as to output the first management signal of the second frequency.

4. The user terminal device according to claim 2 or 3, wherein the service and management module is further configured to output configuration information, the configuration information being used to indicate configuration parameters of the first management signal of the second frequency; and the signal processing module is further configured to process the second management signal according to the clock signal, the time signal and the configuration parameters, so as to output the first management signal of the second frequency.

5. The user equipment according to any of claims 2-4, characterized by The service and management module is a media access control (MAC) chip.

6. The user equipment of any of claims 1-5, wherein, The second transmission power is less than a preset power.

7. A network device, comprising: The network device comprises: an optical module, configured to receive a signal transmitted by a user terminal device, and acquire a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency being greater than the second frequency, and a reception power of the service signal being greater than a reception power of the first management signal; a signal receiving module, configured to receive the service signal of the first frequency and the first management signal of the second frequency.

8. The network device of claim 7, wherein, The signal receiving module comprises: a service and management module, configured to receive the service signal and output a synchronized clock signal and a time signal; a signal processing module, configured to receive the first management signal, the clock signal and the time signal, and process the first management signal according to the clock signal and the time signal, so as to output a second management signal; The service and management module is further configured to receive the second management signal.

9. The network device of claim 8, wherein, The signal processing module is further configured to: determine service timeline information according to the clock signal and the time signal, the service timeline information being used to indicate frame period information of the service signal; and process the first management signal according to the service timeline information, so as to output the second management signal.

10. The network device according to any one of claims 7-9, wherein The optical module is further configured to perform low-pass filtering on the received signal to obtain the first management signal of the second frequency from the received signal.

11. The network device of claim 10, wherein, The optical module comprises: a receiver configured to receive a signal transmitted by a user-side device; a mirror module configured to mirror the received signal to output a first received signal; a filter module configured to perform low-pass filtering on the first received signal to output the first management signal of the second frequency.

12. The network device of claim 10, wherein, The optical module comprises: a receiver configured to receive a signal transmitted by a user-side device; a power divider configured to perform power division on the received signal to output a second received signal; a filter module configured to perform low-pass filtering on the second received signal to output the first management signal of the second frequency.

13. The network device of any of claims 8-12, wherein, The service and management module is a media access control (MAC) chip.

14. A signal transmission method, characterized by, The method is applied to a user-side device and comprises: outputting a service signal of a first frequency and a first management signal of a second frequency, the first frequency being greater than the second frequency; transmitting the service signal by a first transmission power and transmitting the management signal by a second transmission power, the first transmission power being greater than the second transmission power.

15. The method of claim 14, wherein, The outputting of the service signal of the first frequency and the first management signal of the second frequency comprises: outputting the service signal of the first frequency according to a synchronized clock signal and a time signal, and outputting the clock signal, the time signal, and a second management signal; processing the second management signal according to the clock signal and the time signal to output the first management signal of the second frequency.

16. The method of claim 15, wherein, The processing of the second management signal according to the clock signal and the time signal comprises: determining service timeline information according to the clock signal and the time signal, the service timeline information being used to indicate frame period information of the service signal; processing the second management signal according to the service timeline information.

17. The method according to claim 15 or 16, characterized in that The method further comprises: outputting configuration information, the configuration information being used to indicate configuration parameters of the first management signal of the second frequency; the processing of the second management according to the clock signal and the time signal comprises processing the second management signal according to the clock signal, the time signal, and the configuration parameters.

18. The method according to any one of claims 14-17, characterized by, The second transmission power is less than a preset power.

19. A method of signal transmission, the method comprising: The method is applied to a network device and comprises: receiving a signal transmitted by a user-side device; obtaining a service signal of a first frequency and a first management signal of a second frequency from the received signal, the first frequency being greater than the second frequency, and the reception power of the service signal being greater than the reception power of the first management signal.

20. The method of claim 19, wherein, The method further comprises: outputting a synchronized clock signal and a time signal; receiving the clock signal and the time signal, and processing the first management signal according to the clock signal and the time signal to output a second management signal.

21. The method of claim 20, wherein, The processing of the first management signal according to the clock signal and the time signal to output a second management signal comprises: According to the clock signal and the time signal, service time axis information is determined, the service time axis information being used to indicate frame period information of the service signal; The first management signal is processed according to the service time axis information, so as to output the second management signal.

22. The method according to any one of claims 19-21, characterized by, The first management signal of the second frequency is obtained from the received signal, including: The received signal is low-pass filtered, so as to obtain the first management signal of the second frequency from the received signal.

23. An optical communication system, characterized by The optical communication system comprises the user-side device according to any one of claims 1-6 and the network device according to any one of claims 7-13.

24. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises instructions; when the instructions run on the processor, the processor executes the signal transmission method according to any one of claims 14-22.

25. A computer program product, characterised in that, The computer program product comprises a computer program; when the computer program runs on the device, the device executes the signal transmission method according to any one of claims 14-22.

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