WO2022161156A1 - Communication system, data transmission method and related device - Google Patents

Abstract

The embodiments of the present application disclose a communication system, a signal transmission method, and a related device. N communication units on the communication system are interconnected in a loop on the basis of N pairs of optical cables. Meanwhile, optical signals of different wavelengths are transmitted on each optical cable, thus implementing signal transmission between the N communication units, wherein N≥4, and N is an integer. There is a second communication unit among the N communication units. Default wavelength information may be received by means of a communication interface; and according to the default wavelength information, an optical signal, among optical signals from a first optical cable, whose target communication unit is not the second communication unit is transmitted to a third communication unit. In the embodiments of the present application, when the number of communication units of the communication system is greater than or equal to four, the number of optical fibers is reduced, and costs are reduced.

Description

A communication system, data transmission method and related equipment

This application claims the priority of the Chinese patent application filed on January 29, 2021 with the application number 202110129206.4 and the invention titled "a communication system, data transmission method and related equipment", the entire contents of which are incorporated by reference in this application.

technical field

The embodiments of the present application relate to the field of communications, and in particular, to a communications system, a data transmission method, and related devices.

Background technique

Optical fiber communication has been widely used due to its advantages of large communication capacity, good security performance and long relay distance. In practical applications, with the development of integration, how to reduce the number of optical cables in a communication system while ensuring communication has become an urgent problem to be solved.

In the existing communication system, any two communication units are connected through a plurality of pairs of optical cables, so that any two communication units can be directly connected through a pair of optical cables, and use this optical cable for data transmission.

In such a communication system, since there is an optical cable for direct connection between any two communication units, the number of optical cables will increase significantly with the increase of the number of communication units, increasing the cost.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a communication system, a data transmission method, and related equipment. Based on a ring topology, each communication unit is connected by an optical cable, which reduces the number of optical cables and saves costs.

A first aspect of the embodiments of the present application provides a communication system, including:

There are N communication units, and the N communication units are interconnected in a ring through N pairs of optical cables, where N is an integer greater than or equal to 4. Any one of the N communication units can transmit data with N-1 communication units other than itself through the optical cable, that is, each communication unit can serve as a data sender and receiver. In addition, each communication unit can also serve as a relay station in the process of data transmission, sending received signals to other communication units. For example, the first communication unit, the second communication unit and the third communication unit are all included in N communication units, the first communication unit and the second communication unit can be connected by a first optical cable, the second communication unit and the third communication unit It can be connected by a second fiber optic cable. Before the second communication unit receives the optical signal through the first optical cable, it can receive the default wavelength information through the communication interface, and the default wavelength information includes the first wavelength information, which indicates which wavelengths of the optical signal target communication unit is the second communication unit unit. After receiving the first optical signal through the first optical cable, the second communication unit may determine whether the target communication unit of the first optical signal is the second communication unit according to the default wavelength information. If not, the second communication unit may send the first optical signal to the third communication unit through the second optical cable.

It should be noted that in the process of using optical signals for data transmission between communication units, in order to ensure the accuracy of data transmission, each wavelength of the optical signal has a corresponding start node and end node. The starting point of transmission in the communication unit, that is, the starting communication unit in the claims; the end node represents the end point of the transmission of the optical signal in the communication unit, that is, the target communication unit in the claims.

In the embodiment of the present application, based on the ring topology, N pairs of optical cables are used to connect N communication units on the same communication system, and at the same time, optical signals of different wavelengths are transmitted on each optical cable to realize the signal transmission of the N communication units. , compared with the prior art using N(N-1)/2 pairs of optical cables, when the number of communication units is greater than or equal to 4, the number of optical cables is reduced and the cost is saved.

With reference to the first aspect, in the first implementation manner of the first aspect of the embodiments of the present application, in addition to transparently transmitting the optical signal, the second communication unit can also receive or send an optical signal of a specific wavelength. The second communication unit may include a first filter, a first color light module, a second filter and a second color light module. The first filter can determine that the target communication unit is the optical signal of the second communication unit according to the default wavelength information, and then the first color light module can receive these optical signals. The second color light module is used for sending the second optical signal whose initial communication unit is the second communication unit according to the default wavelength information, after that, the second filter can remove the interference in the second optical signal, and transmit the second optical signal to the second optical signal. The signal and the signal to be transparently transmitted are combined and sent to the third communication unit together.

In the embodiment of the present application, in addition to transparently transmitting optical signals, the second communication unit can also receive or send optical signals of specific wavelengths, thereby realizing signal transmission between communication units, and improving the practicability of the technical solution.

A set of wavelengths of optical signals can be used for signal transmission between any two communication units. Conflict will do. The number of optical signals for data transmission between different two communication units can be the same. For example, the first communication unit and the second communication unit Optical signals of three different wavelengths can also be used for data transmission between the communication unit and the third communication unit. In addition, the number of optical signals for data transmission between different two communication units may also be different. For example, three optical signals of different wavelengths may pass between the first communication unit and the second communication unit. For data transmission, five optical signals of different wavelengths can be used for data transmission between the second communication unit and the third communication unit. The types of wavelengths transmitted or received by the second communication unit are related to the number of communication units, which will be described separately below.

With reference to the first implementation manner of the first aspect, in the second implementation manner of the first aspect of the embodiments of the present application, if N=2n, the second communication unit needs to perform signal transmission with 2n-1 communication units. The second communication unit may include n×m first filters, n×m first colored light modules, (n−1)×m second filters, and (n−1)×m second colored lights module. m represents the number of identical wavelengths included in an optical signal of a set of wavelengths, m≥1, and m is an integer. Each of the n×m first filters can filter out an optical signal of a different wavelength according to the default wavelength information, so that the n×m first filters filter out a total of n×m kinds of optical signals. optical signals of different wavelengths. Each of the n×m first colored light modules corresponds to receiving an optical signal of one wavelength. In practical applications, the frequency point of each first color light module needs to be consistent with the frequency point of each first filter, so as to ensure the accuracy of the optical signal received by the second communication unit. Each second colored light module in the (n-1)×m second colored light modules can send a second optical signal whose initial communication unit is the second communication unit according to the default wavelength information, so that (n -1)×m second color light modules send (n-1)×m second optical signals of different wavelengths. Correspondingly, each of the (n-1)×m second filters correspondingly removes interference in an optical signal of one wavelength. In practical applications, the frequency point of each second color light module needs to be consistent with the frequency point of each second filter, so as to ensure the accuracy of the optical signal sent by the second communication unit.

In combination with the first implementation manner of the first aspect, in the third implementation manner of the first aspect of the embodiments of the present application, when the number of communication units is 2n, the number of each device included in the second communication unit may be the same as that of the first communication unit. The second implementation of the aspect is different. The second communication unit may include (n-1)×m first filters, (n-1)×m first colored light modules, n×m second filters, and n×m second colored lights module. m represents the number of identical wavelengths included in a set of wavelengths of optical signals, m ≥ 1, and m is an integer. Each of the (n-1)×m first filters can filter out an optical signal of a different wavelength according to the default wavelength information, so that the (n-1)×m first filters A total of (n-1)×m optical signals of different wavelengths are filtered out by the filter. Each of the (n-1)×m first colored light modules corresponds to receiving an optical signal of one wavelength. In practical applications, the frequency point of each first color light module needs to be consistent with the frequency point of each first filter, so as to ensure the accuracy of the optical signal received by the second communication unit. Each second color light module in the n×m second color light modules can send a second optical signal whose initial communication unit is the second communication unit according to the default wavelength information, so that n×m second color light modules The color light module transmits n×m second optical signals of different wavelengths. Correspondingly, each of the n×m second filters correspondingly removes interference in an optical signal of one wavelength. In practical applications, the frequency point of each second color light module needs to be consistent with the frequency point of each second filter, so as to ensure the accuracy of the optical signal sent by the second communication unit.

In the embodiment of the present application, when the number of communication units in the communication system is even, there are multiple wavelength allocation modes for the second communication unit, which can be flexibly selected according to actual needs, which improves the flexibility of the technical solution.

In combination with the first implementation manner of the first aspect, in the fourth implementation manner of the first aspect of the embodiments of the present application, when the number of communication units is 2n+1, the second communication unit may include n×m first filters a filter, n×m first color light modules, n×m second filters, and n×m second color light modules. m represents the number of identical wavelengths included in an optical signal of a set of wavelengths, m≥1, and m is an integer. Each of the n×m first filters can filter out an optical signal of a different wavelength according to the default wavelength information, so that the n×m first filters filter out a total of n×m kinds of optical signals. optical signals of different wavelengths. Each of the n×m first colored light modules corresponds to receiving an optical signal of one wavelength. In practical applications, the frequency point of each first color light module needs to be consistent with the frequency point of each first filter, so as to ensure the accuracy of the optical signal received by the second communication unit. Each second color light module in the n×m second color light modules can send a second optical signal whose initial communication unit is the second communication unit according to the default wavelength information, so that n×m second color light modules The color light module sends n second light signals of different wavelengths. Correspondingly, each of the n×m second filters correspondingly removes interference in an optical signal of one wavelength. In practical applications, the frequency point of each second color light module needs to be consistent with the frequency point of each second filter, so as to ensure the accuracy of the optical signal sent by the second communication unit.

In the embodiment of the present application, different wavelength allocation schemes can be selected according to the number of communication units, so that the number of optical signals carried on each optical cable is relatively uniform, and the specification requirements for communication units are relatively consistent, thereby reducing costs.

With reference to the first aspect and any one of the first to fourth implementation manners of the first aspect, in the fifth implementation manner of the first aspect of the embodiments of the present application, the transmission direction of the first optical signal may be clockwise direction or counterclockwise.

In this embodiment of the present application, each communication unit may perform signal transmission in a clockwise direction, or may perform signal transmission in a counterclockwise direction, and a pair of optical fibers may implement communication in two directions, and a communication failure occurs in one direction (for example, , adding a new communication unit), which can maintain the service on one side of the whole ring, that is, use the other direction for data transmission. After the fault is resolved, the services on both sides of the entire ring can be restored, which improves the reliability of data transmission.

In the process that two communication units use a pair of optical fibers for signal transmission, each optical fiber in the pair of optical fibers can be used to transmit optical signals in one direction, and optical signals in two communication directions of the two communication units The wavelengths can be the same or different, which are not specifically limited here.

Optionally, the two communication units can also implement signal transmission in two directions through one optical fiber. It should be noted that in the process of using one optical fiber for signal transmission between two communication units, in order to avoid the contradiction of communication, the wavelengths of the optical signals in the two directions are different.

With reference to the first aspect and any one of the first to fifth implementation manners of the first aspect, in the sixth implementation manner of the first aspect of the embodiments of the present application, each of the N communication units may is the base band unit (BBU). In some optional embodiments, each communication unit in the communication system may be a distributed unit (DU).

In combination with the sixth implementation manner of the first aspect, in the seventh implementation manner of the first aspect of the embodiments of the present application, if the communication unit is a baseband unit, the communication system further includes a separate main control unit; if the communication unit is a distribution unit , then any one of the N distribution units can be determined as the master control unit. The main control unit may determine the default wavelength information according to the number of communication units, and send the default wavelength information to the second communication unit through the communication interface.

In the embodiment of the present application, different main control units can be determined according to different communication units, which improves the flexibility of the technical solution.

A second aspect of the embodiments of the present application provides a signal transmission method, including:

The main control unit may determine the number of communication units in the communication system, and then determine the default wavelength information of each communication unit according to the number of communication units. The default wavelength information includes the originating communication unit and the target communication unit of the optical signal. After that, the main control unit may send the default wavelength information to each communication unit through the communication interface of the communication unit, so that each communication unit performs signal transmission according to the default wavelength information.

With reference to the second aspect, in the first implementation manner of the second aspect of the embodiments of the present application, if the number of communication units is 2n, the default wavelength information includes receiving n×m optical signals of different wavelengths, sending (n-1) ×m optical signals of different wavelengths, n≥2, and n is an integer, m≥1, and m is an integer.

With reference to the second aspect, in the second implementation manner of the second aspect of the embodiments of the present application, if the number of communication units is 2n, the default wavelength information includes receiving (n-1)×m optical signals of different wavelengths, sending n ×m optical signals of different wavelengths, n≥2, and n is an integer, m≥1, and m is an integer.

In conjunction with the second aspect, in the third implementation manner of the second aspect of the embodiments of the present application, if the number of communication units is 2n+1, the default wavelength information includes receiving n×m optical signals of different wavelengths, sending n×m optical signals. optical signals of different wavelengths, n≥2, and n is an integer, m≥1, and m is an integer.

In the embodiment of the present application, different wavelength allocation schemes can be selected according to the number of communication units, so that the number of optical signals carried on each optical cable is relatively uniform, and the specification requirements for communication units are relatively consistent, thereby reducing costs. At the same time, when the number of communication units is an even number, different wavelength allocation schemes are also available, which improves the flexibility of the scheme.

With reference to the second aspect and any one of the first to third implementation manners of the second aspect, in the fourth implementation manner of the second aspect of the embodiments of the present application, when the communication unit on the communication system is a baseband processor , the communication system further includes at least one main control unit, which is used to calculate the default wavelength information of each communication unit and manage the normal operation of the baseband processor. When the communication unit on the communication system is a distribution unit, the main control unit may be any one of the distribution units.

In the embodiment of the present application, different main control units can be determined according to different communication units, which improves the flexibility of the technical solution.

A third aspect of the embodiments of the present application provides a main control unit, including:

Processors, memories, input and output devices, and buses. Among them, the processor, the memory, and the input and output devices are connected to the bus. The processor is configured to perform the following steps: determine the number of communication units included in the communication system, and then, according to the number of the communication units, determine wavelength default information of each communication unit, where the default wavelength information includes the initial communication unit of the optical signal and target communication unit. Finally, the wavelength default information is sent to each communication unit through the communication interface of each communication unit, so that each communication unit performs signal transmission according to the default wavelength information.

The main control unit is configured to execute the method of the aforementioned second aspect.

The beneficial effects shown in this aspect are similar to the beneficial effects of the second aspect, which are shown in the second aspect for details, and will not be repeated here.

A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, where a program is stored in the computer-readable storage medium, and when the computer executes the program, the method of the foregoing second aspect is performed.

A fifth aspect of the embodiments of the present application provides a computer program product. When the computer program product is executed on a computer, the computer executes the method of the foregoing second aspect.

The beneficial effects shown in the fourth aspect and the fifth aspect of the embodiment of the present application are similar to the beneficial effects of the second aspect, which are shown in the second aspect for details, and will not be repeated here.

Description of drawings

FIG. 1 is a schematic diagram of an application scenario of a communication system provided by an embodiment of the present application;

2a is a schematic structural diagram of a communication system provided by an embodiment of the present application;

FIG. 2b is another schematic structural diagram of a communication system provided by an embodiment of the present application;

FIG. 2c is another schematic structural diagram of a communication system provided by an embodiment of the present application;

3 is another schematic structural diagram of a communication system provided by an embodiment of the present application;

FIG. 4 is a logical diagram of a ring interconnection of communication units provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of an application scenario of a baseband unit provided by an embodiment of the present application;

6a is a schematic structural diagram of a communication unit provided by an embodiment of the present application;

FIG. 6b is another schematic structural diagram of a communication unit provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of another application scenario of the baseband unit provided by the embodiment of the present application;

FIG. 8a is a schematic diagram of another application scenario of the baseband unit provided by the embodiment of the present application;

FIG. 8b is a schematic diagram of another application scenario of the baseband unit provided by the embodiment of the present application;

FIG. 9 is a schematic flowchart of a signal transmission method provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a main control unit provided by an embodiment of the present application.

Detailed ways

The embodiments of the present application provide a communication system, a signal transmission method, and related equipment. Based on a ring topology, N pairs of optical cables are used to connect N communication units on the same communication system, and at the same time, different wavelengths are transmitted on each optical cable. Compared with the prior art using N(N-1)/2 pairs of optical cables, when the number of communication units is greater than or equal to 4, the number of optical cables is reduced, saving cost.

First, an application scenario of the communication system provided by the embodiment of the present application is described. The communication system provided in the embodiments of the present application can be applied to a radio access network (RAN), as a frame-type or cassette-type baseband processing device in a base station, to transmit signals. In addition, the communication system can also be used in other scenarios that require large bandwidth and optical fiber communication, for example, an optical transport network or a fronthaul link, which is not specifically limited here. The embodiments of the present application are described by taking the communication system applied in the RAN as an example of a frame-type or cassette-type baseband processing device.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an application scenario of the communication system provided by the embodiment of the present application. As shown in FIG. 1 , the base station 110 includes an antenna 111 , a remote radio unit (RRU) 112 and a frame/cassette baseband processing device 113 . The remote radio unit 112 can receive the signal sent by the antenna 111, and send the signal to the frame/cassette baseband processing device 113, and the frame/cassette baseband processing device 113 can return the data carried by the signal ( backhaul) to the core network.

Centralized radio access network (C-RAN) is a green radio access network architecture based on centralized processing, cooperative radio, and real-time cloud computing. By reducing the number of base station equipment rooms, C-RAN can reduce power consumption, and also has the advantages of low cost and high resource utilization, making it a mainstream base station form. With the development of a centralized radio access network (C-RAN), people's requirements for baseband interconnection are becoming more and more urgent, and it is hoped that baseband interconnection can save costs as much as possible.

The embodiments of the present application provide a communication system that can implement MESH interconnection between communication units through optical signals of different wavelengths based on a ring optical fiber topology. The different structures of the communication system will be described below. 2a to 2c are several examples of frame-type baseband processing apparatuses, and FIG. 3 is an example of cassette-type baseband processing apparatuses. Please refer to FIG. 2a, which is a schematic structural diagram of a communication system provided by an embodiment of the present application. As shown in Figure 2a, the frame-type baseband processing device includes a fan, a baseband unit, a power supply and a main control unit. Among them, the fan is used to cool the baseband unit and play a protective role. The power supply is used to provide power support for the normal operation of the baseband unit and the main control unit. The main control unit is used to determine the default wavelength information, allocate optical signals of different wavelengths to the baseband unit, control the baseband unit to transmit signals, and transmit the signals received by the baseband unit from the remote radio unit through the communication interface. to the core network. The baseband units are connected to each other based on a ring fiber topology, and each baseband unit communicates with other baseband units through optical signals of different wavelengths. The default wavelength information may be calculated and determined by the main control unit according to the situation of the ring topology, may also be manually input in advance, or may be acquired in other ways, which are not specifically limited here.

It should be noted that FIG. 2a is only a schematic structural diagram of the communication system in the embodiment of the present application. In practical applications, the structure of the frame-type baseband processing device may also have other situations, please refer to FIG. 2b and FIG. 2c, FIG. 2b and FIG. 2c is a schematic structural diagram of a communication system provided by an embodiment of the present application, respectively. In Figures 2b and 2c, the components of the frame-type baseband processing device are the same as those of the frame-type baseband processing device shown in Figure 2a, the difference lies in the position and number of the baseband unit, and the position and number of the main control unit . When the number of communication units is greater than or equal to 4, the communication system provided by the embodiment of the present application can realize the effect of saving the number of optical fibers based on the ring fiber topology. Therefore, in the embodiments shown in FIG. 2b and FIG. 2c, the number of baseband units is equal to More than 4, and the position of the baseband unit can form a ring.

It should be noted that in practical applications, there are many possibilities for the location and number of baseband units and the location and number of main control units, which can be selected according to the needs of the actual application, as long as there are at least 4 One baseband unit, at least one main control unit, and the positional arrangement of the baseband units can form a ring, which is not specifically limited here. 2a to 2c are only examples of the structure of the frame-type baseband processing device provided by the embodiments of the present application, and do not constitute a limitation on the frame-type baseband processing device.

In addition to the above-mentioned structure, the baseband processing apparatus may also have a cassette type structure. Please refer to FIG. 3 , which is a schematic structural diagram of a communication system provided by an embodiment of the present application. As shown in FIG. 3 , each baseband master control unit can be used as a cassette baseband processing device, that is, the distribution unit in the claims. Multiple baseband master control units can realize ring interconnection through a pair of ring fibers, and transmit optical signals in two different directions. The baseband master control unit can realize the function of the baseband unit in the embodiment shown in FIG. 2a to FIG. 2c. Different from the embodiments shown in Fig. 2a to Fig. 2c, in the communication system shown in Fig. 3, there may be no separate main control unit, and the baseband main control unit is any one of the unit to realize Figs. 2a to 2c. The role of the main control unit in the embodiment shown in Figure 2c.

In the embodiment of the present application, compared with the prior art, which requires the use of switches to realize the interconnection of communication units, the space of the communication system is saved and the cost is reduced. At the same time, using N or N pairs of optical fibers to realize the interconnection of N communication units not only reduces the number of optical fibers, but also simplifies the interface and reduces the probability of wiring errors.

In the process of optical fiber communication, the communication system can use the baseband unit or the distribution unit for signal transmission. In addition, other communication units can also be used for signal transmission, which can be selected according to the needs of the actual application. limited.

The embodiments of the present application are described by taking an example that a communication system uses six communication units to transmit optical signals. Please refer to FIG. 4 . FIG. 4 is a logical diagram of a ring interconnection of communication units in an embodiment of the present application. As shown in Figure 4, 6 communication units are connected to each other based on a ring topology through 6 pairs of optical fibers. Data transmission is performed between communication units through optical signals of different wavelengths, so that the communication between nodes does not interfere with each other. In the embodiment shown in FIG. 4 , the communication unit 1 and the communication unit 2 can use an optical signal with a wavelength of λ1 for data transmission, the communication unit 1 and the communication unit 3 can use an optical signal with a wavelength of λ2 for data transmission, and the communication unit 1 and The communication unit 4 can use an optical signal with a wavelength of λ3 for data transmission. In the embodiment of the present application, the optical signal of the same wavelength can also be used in the communication of different communication units. As shown in FIG. 4 , the communication unit 3 and the communication unit 4 can also use the optical signal of wavelength λ1 for data transmission, so that It can realize wavelength multiplexing between different communication units and save frequency resources.

It should be noted that, in the embodiment shown in FIG. 4 , the communication unit 1 can send an optical signal with a wavelength of λ1 to the communication unit 2 through the optical fiber 1, and can also send an optical signal with a wavelength of λ1 to the communication unit 2 through the optical fiber 2. The actual application needs to make a selection, which is not specifically limited here. If the communication unit 1 sends an optical signal with a wavelength of λ1 to the communication unit 2 through the optical fiber 1, and the wavelength of the optical signal sent by the communication unit 2 to the communication unit 1 is also λ1, then the communication unit 2 should use the optical fiber 2 to send the optical signal to the communication unit 1. This optical signal is sent, thereby avoiding communication errors. The principle of signal transmission between any other two communication units is similar to that, and will not be repeated here.

In practical applications, the optical signal transmitted between any two communication units can be an optical signal of a set of wavelengths, and this set of wavelengths can be an optical signal of the same wavelength, or it can be an optical signal of several different wavelengths. There is no specific limitation here. For example, in a clockwise direction, communication unit 1 can send optical signals of 2 different wavelengths to communication unit 2, and communication unit 6 can also send optical signals of 2 different wavelengths to communication unit 2, in this case , in order to avoid communication errors, the wavelengths of the optical signals sent by the communication unit 1 and the communication unit 6 should be different from each other: for example, the wavelengths of the optical signals sent by the communication unit 1 are λ1 and λ2 respectively, then the optical signals sent by the unit 6 can be other wavelengths than λ1 and λ2. In addition, the communication unit 6 can also send more or less than 2 optical signals of different wavelengths to the communication unit 2. For example, the communication unit 6 can also send 4 optical signals of different wavelengths to the communication unit 2. These optical signals The wavelengths of the signals can be λ3, λ4, λ6 and λ8, respectively. The wavelength type and quantity of the optical signal between any two communication units are selected according to actual application requirements, which are not specifically limited here. For brevity of description, in the following embodiments, in one transmission direction, an optical signal of the same wavelength is transmitted between any two communication units as an example for description.

In practical applications, the communication unit may be a baseband unit, a distribution unit, or other communication units used for optical fiber communication, which will not be described in detail here. In the following embodiments, the communication unit is taken as an example of a baseband unit for description.

For ease of illustration, each baseband unit may be abstracted as a node, and the manner in which six baseband units communicate with each other based on the ring topology may be shown in FIG. 5 . Please refer to FIG. 5 , which is a schematic diagram of an application scenario of the baseband unit in the embodiment of the present application.

As shown in FIG. 5 , each baseband unit may perform signal transmission in a clockwise direction, or may perform signal transmission in a counterclockwise direction, which is selected according to actual application needs, which is not specifically limited here. In this embodiment of the present application, a pair of optical fibers can implement communication in two directions, and if the communication in one direction fails (for example, a new communication unit is added), the service can be maintained on one side of the entire ring, that is, the other direction is used for communication. data transmission. After the fault is resolved, the services on both sides of the entire ring can be restored, which improves the reliability of data transmission.

In this embodiment, the communication process of node 1 and other nodes is described by taking the communication in the clockwise direction as an example. In the clockwise direction, node 1 can send optical signals with wavelengths of λ1, λ2 and λ3 to node 2, node 3 and node 4, respectively, for data transmission. Node 1 can also receive optical signals with wavelengths of λ1 and λ2 sent by Node 5 and Node 6, respectively, to implement communication with Node 5 and Node 6.

In the process of baseband units communicating with each other, a baseband unit may receive multiple optical signals, but these optical signals may contain optical signals whose terminal nodes are not their own. Therefore, the baseband unit can obtain optical signals from multiple wavelengths. Determine the light signal sent to yourself. The reason why the baseband unit can implement such a function is related to the structure of the baseband unit itself. The baseband unit provided by the embodiments of the present application is introduced below. Please refer to FIG. 6a, which is a schematic structural diagram of a communication unit provided by an embodiment of the present application.

As shown in Fig. 6a, the baseband unit or the distribution unit may include tunable filters and color light modules. Among them, the tunable filter can be a tunable micro-ring filter (TOADM), or a micro-ring filter (FLT MR), in addition, it can also be other filters, as long as it is the filter of the optical signal filtered by the filter. The wavelength can be adjusted according to actual application needs, which is not specifically limited here. It should be noted that, in practical applications, the tunable filter 1 and the tunable filter 2 may also be the same filter, which is used to filter optical signals in clockwise and counterclockwise directions.

The baseband unit may also include a communication interface for receiving its own default wavelength information before performing signal transmission with other baseband units, the default wavelength information including the wavelength information of the optical signal whose originating communication unit is itself, and the target communication unit is wavelength information of its own optical signal. In the process of using optical signals for data transmission between communication units, in order to ensure the accuracy of data transmission, the wavelength of each optical signal has a corresponding start node and end node, and the start node represents the optical signal transmitted in the communication unit. The starting point is the starting communication unit in the claims; the end node represents the end point where the optical signal is transmitted in the communication unit, that is, the target communication unit in the claims. The default wavelength information including the starting communication unit and the target communication unit is the basis for each baseband unit to perform signal transmission with other baseband units without interfering with each other.

If the baseband unit shown in Figure 6a is the No. 1 baseband unit, each fine-tuning filter in the adjustable filter is used to filter the optical signal of the destination communication unit or the initial communication unit is the No. 1 baseband unit, and the color light module is used to receive The destination communication unit is the optical signal of the baseband unit No. 1, or the sending start communication unit is the optical signal of the baseband unit No. 1.

Specifically, it is taken as an example that there are two optical fibers between the two communication units, which are respectively used for the two communication units to communicate in clockwise and counterclockwise directions. The baseband unit No. 1 can be regarded as the second communication unit in the claim. If in a clockwise direction, the default wavelength information of the baseband unit No. 1 is to receive optical signals with wavelengths λ1 and λ2, and transmit wavelengths of λ1, λ2 and λ2. λ3 optical signal. Then, as shown in Figure 6a, when the baseband unit No. 1 receives optical signals with wavelengths λ1, λ2, λ4 and λ5 from the first communication unit through the first optical cable, the micro-ring filter 1 and the micro-ring filter 2 corresponds to the first filter in the claims, can filter out the light signals with wavelengths λ1 and λ2 respectively, the color light module 1 and the color light module 2 correspond to the first color light module in the claims, can receive respectively For optical signals with wavelengths λ1 and λ2, this process can be called "dropping". The optical signals with wavelengths of λ4 and λ5 that are not filtered by the first filter are transparently transmitted on the baseband unit No. 1, and the colored light module 3, the colored light module 4 and the colored light module 5 correspond to the second colored light in the claims. The module can send out optical signals with wavelengths of λ1, λ2 and λ3 respectively, and the micro-ring filter 3, the micro-ring filter 4 and the micro-ring filter 5 correspond to the second filter in the claims, and can remove the second color filter respectively. The interference in the optical signal sent by the optical module makes the final optical signal output by the No. 1 baseband unit relatively pure, and this process can be called "up-wave".

It should be noted that the frequency points of the optical signals processed by each micro-ring filter and each color light module need to be consistent, which is conducive to ensuring accurate and fast communication. For example, the function of the micro-ring filter 1 is to filter out the optical signal with the wavelength λ1, and the function of the color light module 1 is to absorb the optical signal with the wavelength λ1. The function of the color light module 4 is to transmit an optical signal with a wavelength of λ2, and the function of the micro-ring filter 4 is to remove interference factors in the optical signal with a wavelength of λ2 sent by the color light module 4 .

In practical applications, each color light module can have the ability to receive and transmit optical signals. As shown in Figure 6a, in the counterclockwise direction, the color light module 1 can send an optical signal of a certain wavelength to the micro-ring filter 1', and the color light module 5 can receive a certain wavelength filtered by the micro-ring filter 5'. Optical signals of various wavelengths, so as to realize the transmission of optical signals in two directions. In this case, the wavelengths of the optical signals received or sent by the same color light module can be the same. For example, the color light module 1 can receive the optical signal with the wavelength λ1, and can also send the wavelength to the micro-ring filter 1' is the optical signal of λ1. It should be noted that the wavelengths of the optical signals received or sent by the same color light module may also be different, which are selected according to actual application needs, which are not specifically limited here.

It should be noted that, from different angles, the quantitative relationship between the color light module and the filter can be different. In one transmission direction, the numbers of the first filters and the first color light modules may be the same, and the numbers of the second color light modules and the second filters may also be the same. If the clockwise direction and the counterclockwise direction are comprehensively considered, one color light module can correspond to two filters. For example, the color light module 1 corresponds to the first color light module in claim 1 in the clockwise direction, which is used to receive Optical signal; in the counterclockwise direction, corresponding to the second color light module in the claim, used for sending optical signals.

Optionally, a temporarily disabled micro-ring filter may also exist in the tunable filter, for example, the micro-ring filter 6 shown in FIG. 6a. Since the default wavelength information between communication units in the embodiments of the present application can be adjusted, in some embodiments, the baseband unit No. 1 can receive optical signals with wavelengths λ1, λ2 and λ4. In this case , the micro-ring filter 6 can be used to filter the optical signal with wavelength λ4. In the embodiment of the present application, the optical signals filtered by each filter can be adjusted according to different default wavelength information, which improves the flexibility and practicability of the technical solution of the present application.

Optionally, the connection relationship between the tunable filter and the color light module and the communication unit may be pluggable or onboard, which is not specifically limited here. More commonly, when the communication unit is a baseband unit, the tunable filter and the color light module are generally pluggable with the baseband unit; when the communication unit is a distribution unit, the tunable filter and the color light module, and The distribution unit is generally integrated. The interconnectivity between the communication units can be realized by the adjustable filter and the color light module. The adjustable filter and the color light module can be isolated from the internal fault of the communication unit. As long as the communication system can supply power, it will not affect the ring topology. interconnection function. Therefore, the fault can be confined to the inside of each communication unit and will not spread. In addition, tunable filters and color light modules can also be backed up by channel or module, and the failure of a single channel or single module will not affect the process of interconnection.

In practical applications, the number of the first filter, the first color light module, the second filter and the second color light module included in each baseband unit may be various. For example, when the wavelength of the optical signal is single and changes In the case of a slow frequency, there can be only one first filter and one first color light module. The wavelength of the filtered optical signal of the first filter is adjusted according to the wavelength of the optical signal received by the baseband unit. The optical module can also be adjusted synchronously to realize time-division multiplexing of the first filter and the first color light module. The second filter and the second color light module can also implement time-division multiplexing. The number of filters and color light modules is selected according to actual application needs, which are not specifically limited here.

In some optional embodiments, between two communication units, signal transmission in two directions may also be implemented through one optical fiber. The following is a brief description of the situation of realizing signal transmission in two directions through one optical fiber between two communication units. Please refer to FIG. 6b, which is a schematic structural diagram of a communication unit provided by an embodiment of the present application.

For color light modules and tunable filters, they do not perceive whether the signal transmission between the two communication units is through a single fiber or a dual fiber, but only receive and send optical signals according to the default wavelength information. Therefore, the processing mode for the signal is similar to that in the embodiment shown in FIG. 6a. The difference is that, in order to avoid the contradiction of communication, the wavelengths of the optical signals that the same two communication units communicate in different transmission directions are different. For example, the color light module 1 can receive an optical signal with a wavelength of λ1. In this case, the wavelength of the optical signal sent by the color light module to the micro-ring filter 1' is not λ1.

In the case of realizing signal transmission in two directions through one optical fiber between two communication units, the communication system may further include a multiplexer and demultiplexer, which is used for demultiplexing or multiplexing of optical signals, so that the Signal transmission went smoothly.

The reason why the communication system provided by the embodiment of the present application can realize the communication between any two communication units based on the ring topology is related to the allocation of wavelengths, that is, the process of determining the default wavelength information. In practical applications, the paths for sending and receiving signals between two nodes may be the same or different, which will be described separately below.

1. The sending and receiving paths are the same.

In practical applications, the number of communication units may be determined according to the needs of practical applications, and the embodiment shown in FIG. 7 is described by taking 6 communication units as an example. In this embodiment, the communication unit is a baseband unit as an example. Please refer to FIG. 7 . FIG. 7 is a schematic diagram of an application scenario of the baseband unit in the embodiment of the present application. For the sake of clarity and conciseness of the illustration, FIG. 7 only shows the wavelength assignments at node 1 and node 2. In the following, the wavelength allocation logic at each node is described by taking the clockwise direction of signal transmission and the transmission of an optical signal of one wavelength between two communication units as an example. The counterclockwise direction can use the same allocation logic as the clockwise direction, and will not be repeated here.

Before receiving the optical signal, the baseband unit can receive the default wavelength information sent by the main control unit through the communication interface. The default wavelength information includes the wavelength information of the optical signal with the baseband unit as the starting communication unit and the wavelength information of the optical signal with the baseband unit as the target communication unit. The default wavelength information is used for the baseband unit to transmit, receive and transparently transmit signals. The communication interface may be a serial interface, a network port, or other interface types, which are not specifically limited here. In addition, the communication unit may also acquire default wavelength information based on the default monitoring channel.

Optionally, 3 wavelengths can be specified in the starting direction of node 1, that is, the three starting communication units at node 1 are designated as optical signals of different wavelengths of node 1, which are used for node 1 and node 2 respectively. To node 4 for point-to-point communication. You can also specify 2 wavelengths in the starting direction of node 1, that is, specify two target communication units at node 1 as optical signals of different wavelengths of node 1, which are used for node 1 and nodes 4 and 5 respectively. for peer-to-peer communication. Based on the above allocation method, the wavelength allocation of the No. 1 node and the other five nodes is realized. Among them, the wavelengths in the upper hand direction and the lower hand direction can be multiplexed, thereby saving frequency resources and reducing costs.

Next, wavelength allocation needs to be performed on node 2. Since the wavelengths have already been allocated between the No. 1 node and the No. 2 node, it is only necessary to allocate 4 more wavelengths to the No. 2 node. Two wavelengths can be allocated in the upper hand direction and the lower hand direction of node 2 each. When assigning wavelengths in the starting direction, since λ2 and λ3 have been assigned to the communication between No. 1 node and No. 3 and No. 4 nodes, the starting direction of No. 2 node will not affect the normal communication and try not to increase the frequency resources. λ1 and λ4 can be assigned. Similarly, when assigning the starting direction, since λ1, λ2 and λ3 have been assigned to the communication between No. 1 node and No. 2, No. 3 and No. 4 nodes, it will not affect normal communication and try not to increase frequency resources. , the overhand direction of node 2 can be assigned λ4 and λ5.

According to the above allocation logic, the final allocation of each node can be shown in Table 1:

Table 1

wavelength		end point 1	end point 2	end point 3	end point 4	end point 5	end point 6
start node 1		λ1	λ2	λ3
start node 2			λ1	λ4
start node 3				λ5	λ2	λ1
start node 4					λ5	λ3
start node 5	λ2	λ5				λ4
start node 6	λ1	λ4

As shown in Table 1, since each node needs to communicate with other nodes, the sum of the wavelengths of a node as the start node and the end node is the total number of nodes minus 1. The start node in Table 1 corresponds to the start communication unit in the claims, and the end node corresponds to the target communication unit in the claims.

Finally, a wavelength topology of "X-on-Y-lower-Z punch-through" can be formed at each node. Among them, "X up" means that there are X up waves at this node, that is, there are X wavelengths with this node as the starting node; "Y down" means that there are Y down waves at this node, that is, There are Y wavelengths with this node as the end node; "Z pass-through" means that there are Z wavelengths transparently transmitted at this node.

According to the allocation method shown in Table 1, the obtained upper and lower pass-through wavelengths of each node are shown in Table 2:

Table 2

	on the wave	down wave	punch through
Node 1	λ1, λ2, λ3	λ1, λ2	λ4, λ5
Node 2	λ1, λ4	λ1, λ4, λ5	λ2, λ3
Node 3	λ1, λ2, λ5	λ1, λ2	λ3, λ4
Node 4	λ3, λ5	λ3, λ4, λ5	λ1, λ2
Node 5	λ2, λ4, λ5	λ2, λ5	λ1, λ3
Node 6	λ1, λ4	λ1, λ3, λ4	λ2, λ5

As shown in Table 2, the No. 1 node forms a topology structure of "3 up, 2 down and 2 through". It should be noted that Tables 1 and 2 describe the flow of waves from the point of view of connections and nodes, respectively. Tables 1 and 2 only give an example of an assignment, and other non-conflicting assignments are possible in practical applications. method, and details are not repeated here.

According to the above allocation logic, the number of wavelengths allocated in the upper hand direction and the lower hand direction of each node is relatively close, so that the number of light waves carried on each optical cable is relatively uniform, and the specification requirements for the baseband unit or step-by-step unit are relatively consistent, reducing the cost. At the same time, each node communicates with other nodes through the upper hand direction or the lower hand direction, which can reduce the attenuation of the optical signal due to the long transmission path, and improve the communication quality.

In this embodiment of the present application, wavelengths may also be allocated according to other allocation logics, as long as it can ensure that the communication between each node does not interfere with each other, which is not specifically limited here. For example, each node communicates with other nodes through the start direction or the start direction. Compared with the allocation logic shown in Table 1, although this allocation method can also ensure the communication of each node, it needs to consume more frequency points resource.

In the implementation of the present application, the ring interconnection between communication units is realized based on the ring fiber topology, which reduces the number of fibers used for interconnection and reduces the cost. At the same time, it is also possible to flexibly allocate the add-on or drop-off of each communication unit according to the needs of the actual application, so as to realize the dynamic or semi-static allocation of the bandwidth, and improve the flexibility of the technical solution.

Second, the sending and receiving paths are different.

In the embodiment of the present application, four nodes are used as an example to describe the case where the transmission and reception paths are different. In the clockwise direction, please refer to FIG. 8a, which is a schematic diagram of an application scenario of the baseband unit in the embodiment of the present application. In the counterclockwise direction, please refer to FIG. 8b, which is a schematic diagram of an application scenario of the baseband unit in the embodiment of the present application.

The wavelengths can be allocated using the allocation logic of the embodiment shown in FIG. 8a. After the allocation, the allocation of each node in the clockwise direction can be shown in Table 3:

table 3

wavelength		end point 1	end point 2	end point 3	end point 4
start node 1		λ1	λ2
start node 2			λ1	λ3
start node 3				λ1
start node 4	λ1

As shown in Table 3, since each node has to communicate with other points, the sum of the wavelengths of a node as the start node and the end node is the total number of nodes minus 1. In the case where the communication system has four communication units, the sum of the wavelengths with a certain node as the start node and the end node is 3.

According to the allocation method shown in Table 3, the obtained upper and lower pass-through wavelengths of each node are shown in Table 4:

Table 4

	on the wave	down wave	punch through
Node 1	λ1, λ2	λ1
Node 2	λ1, λ3	λ1	λ2
Node 3	λ1	λ1, λ2	λ3
Node 4	λ1	λ1, λ3

It should be noted that Table 3 and Table 4 only provide an example of allocation, and other non-conflicting allocation methods may also be used in practical applications, which will not be described in detail here.

The distribution of each node in the counterclockwise direction can be shown in Table 5:

table 5

wavelength		end point 4	end point 3	end point 2	end point 1
start node 4		λ2
start node 3			λ2	λ3
start node 2	λ2			λ1
start node 1	λ3

According to the allocation method shown in Table 5, the obtained upper and lower pass-through wavelengths of each node are shown in Table 6:

Table 6

	on the wave	down wave	punch through
Node 1	λ2	λ2, λ3
Node 2	λ2, λ3	λ2
Node 3	λ1, λ2	λ2	λ3
Node 4	λ3	λ1, λ3	λ2

It should be noted that Table 5 and Table 6 only provide an example of allocation, and other non-conflicting allocation methods may also be used in practical applications, which will not be described in detail here.

In this embodiment of the present application, the communication units may perform signal transmission in a clockwise direction, or may perform signal transmission in a counterclockwise direction, which is selected according to actual application needs, which is not specifically limited here. In this embodiment of the present application, a pair of optical fibers can implement communication in two directions, and if the communication in one direction fails (for example, a new communication unit is added), the service can be maintained on one side of the entire ring, that is, the other direction is used for communication. data transmission. After the fault is resolved, the services on both sides of the entire ring can be restored, which improves the reliability of data transmission.

The following describes the signal transmission method provided by the embodiment of the present application. Please refer to FIG. 9 , which is a schematic flowchart of the signal transmission method provided by the embodiment of the present application.

901. The main control unit determines the number N of communication units.

The communication unit on the communication system is different, and the main control unit is also different. If the communication unit on the communication system is a baseband unit, there will be a separate main control unit in the communication system; if the communication unit on the communication system is a distribution unit, the main control unit can be any one of the distribution units. The main control unit may determine the number N of communication units, and use this as the basis for calculating the default wavelength information. Among them, N≥4, and N is an integer.

902. The main control unit determines default wavelength information according to the number N of communication units.

After the main control unit determines the number of communication units, it can calculate the default wavelength information. Since any two communication units can transmit signals through optical signals of a set of wavelengths, and a set of wavelengths can be optical signals of one wavelength or multiple wavelengths, in this embodiment of the present application, m is used to represent a set of wavelengths. The number of identical wavelengths included in the optical signal, m≥1, and m is an integer.

In some optional embodiments, if the number of communication units is N=2n, the main control unit may determine that the default wavelength information includes receiving n×m optical signals of different wavelengths, sending (n−1)×m different wavelengths light signal.

In some optional embodiments, if the number of communication units is N=2n, the main control unit may also determine that the default wavelength information includes receiving (n-1)×m optical signals of different wavelengths, and sending n×m different wavelengths. wavelength of light.

In some optional embodiments, if the number of communication units is N=2n+1, the main control unit may determine that the default wavelength information includes receiving n×m optical signals of different wavelengths and sending n×m optical signals of different wavelengths Signal.

The specific content of the default wavelength information can also be calculated according to the needs of the actual application. The preceding embodiments are only some possible implementations, and do not constitute a limitation on the default wavelength information. There are other situations in the types of wavelengths sent or received. For example, when N=2n, optical signals of (n-2)×m wavelengths are received, and optical signals of (n+1)×m wavelengths are sent, which is not specifically limited here.

In some optional embodiments, the default wavelength information may also be determined by manual pre-calculation and input into the main control unit. There are various ways for the main control unit to obtain the default wavelength information, which is not specifically limited here.

903. The main control unit sends the respective default wavelength information to each communication unit.

After the master control unit acquires the default wavelength information, it can send the corresponding default wavelength information to each communication unit through the communication interface, so that each communication unit performs signal transmission according to the default wavelength information, and the signal transmission includes signal reception and transmission. and at least one of passthrough.

It should be noted that the default wavelength information in the embodiments of the present application is not static, and can be flexibly adjusted according to the actual bandwidth requirements. Achieve dynamic or semi-static bandwidth allocation.

In the embodiment of the present application, different wavelength allocation schemes can be selected according to the number of communication units, so that the number of optical signals carried on each optical cable is relatively uniform, and the specification requirements for communication units are relatively consistent, thereby reducing costs. At the same time, when the number of communication units is an even number, different wavelength allocation schemes are also available, which improves the flexibility of the scheme.

FIG. 10 is a schematic structural diagram of a main control unit provided by an embodiment of the present application. The main control unit 1000 may include one or more central processing units (CPUs) 1001 and a memory 1005. The memory 1005 stores a one or more applications or data.

Among them, the memory 1005 may be volatile storage or persistent storage. The program stored in the memory 1005 may include one or more modules, each of which may be used to perform a series of operations performed by the main control unit. Furthermore, the central processing unit 1001 may be configured to communicate with the memory 1005 to execute a series of instruction operations in the memory 1005 on the main control unit 1000 .

The main control unit 1000 may also include one or more power supplies 1002, one or more wired or wireless network interfaces 1003, one or more input and output interfaces 1004, and/or, one or more operating systems, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

The central processing unit 1001 can perform the operations performed by the main control unit in the embodiment shown in FIG. 9, and details are not repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

Claims (14)

1. A communication system, comprising:

   N communication units, the N communication units are interconnected in a ring through N pairs of optical cables, N≥4, and N is an integer;

   The N communication units include a first communication unit, a second communication unit and a third communication unit, the first communication unit and the second communication unit are connected by a first optical cable, and the second communication unit and the The third communication unit is connected by a second optical cable, and the second communication unit includes a communication interface;

   The second communication unit is used for:

   receiving default wavelength information through the communication interface, where the default wavelength information includes first wavelength information, and the first wavelength information indicates that the target communication unit of the optical signal is the second communication unit;

   If it is determined according to the default wavelength information that the target communication unit of the first optical signal from the first optical cable is not the second communication unit, the target communication unit is transmitted to the third communication unit through the second optical cable. transmit the first optical signal.
2. The communication system according to claim 1, wherein the default wavelength information further includes second wavelength information, and the second wavelength information indicates that the initial communication unit of the optical signal is the second communication unit;

   The second communication unit includes a first filter, a first color light module, a second filter and a second color light module;

   the first filter, configured to determine that the target communication unit is an optical signal of the second communication unit according to the default wavelength information;

   the first color light module for receiving the optical signal that the target communication unit is the second communication unit;

   the second color light module, configured to send a second optical signal whose initial communication unit is the second communication unit according to the default wavelength information;

   The second filter is used to filter the interference signal in the second optical signal.
3. The communication system according to claim 2, wherein if N=2n, the number of the first filters in the second communication unit is n×m, and the first color light module The number of filters is n×m, the number of the second filters is (n-1)×m, the number of the second color light modules is (n-1)×m, m≥1, and m is an integer;

   Each of the n×m first filters is configured to determine, according to the default wavelength information, an optical signal whose target communication unit is the second communication unit, so that the n ×m first filters determine n×m optical signals of different wavelengths;

   Each of the n×m first colored light modules is configured to receive an optical signal in which the target communication unit is the second communication unit, so that the n×m first colored light modules are The color light module receives the n×m optical signals of different wavelengths;

   Each second colored light module in the (n-1)×m second colored light modules is configured to send one kind of the second optical signal according to the default wavelength information, so that the (n-1) )×m second color light modules send (n−1)×m second optical signals of different wavelengths;

   Each of the (n-1)×m second filters is used to filter an interference signal in the second optical signal, so that the (n-1)×mth The second filter filters the second optical signals of the (n-1)×m different wavelengths.
4. The communication system according to claim 2, wherein if N=2n, the number of the first filters in the second communication unit is (n-1)×m, and the number of the first filters is (n−1)×m. The number of one color light module is (n-1)×m, the number of the second filter is n×m, the number of the second color light module is n×m, m≥1, and m is an integer;

   Each of the (n-1)×m first filters is used to determine, according to the default wavelength information, an optical signal whose target communication unit is the second communication unit, to enabling the (n-1)×m first filters to determine (n-1)×m optical signals of different wavelengths;

   Each of the (n-1)×m first colored light modules is configured to receive an optical signal in which the target communication unit is the second communication unit, so that the (n -1)×m first color light modules receive the (n-1)×m optical signals of different wavelengths;

   Each of the n×m second colored light modules is configured to send one type of the second optical signal according to the default wavelength information, so that the n×m second colored light modules are The module sends the second optical signals of n×m different wavelengths;

   Each of the n×m second filters is used to filter an interference signal in one of the second optical signals, so that the n×m second filters filter the second optical signals of the n×m different wavelengths.
5. The communication system according to claim 2, wherein if N=2n+1, the number of the first filters in the second communication unit is n×m, and the first filter The number of optical modules is n×m, the number of the second filters is n×m, the number of the second color light modules is n×m, m≥1, and m is an integer;

   Each of the n×m first filters is configured to determine, according to the default wavelength information, an optical signal whose target communication unit is the second communication unit, so that the n ×m first filters determine n×m optical signals of different wavelengths;

   Each of the n×m first colored light modules is configured to receive an optical signal in which the target communication unit is the second communication unit, so that the n×m first colored light modules are The color light module receives the n×m optical signals of different wavelengths;

   Each of the n×m second colored light modules is used for sending one kind of the second optical signal, so that the n×m second colored light modules send n×m different kinds of light signals. the second optical signal of the wavelength;

   Each of the n×m second filters is used for filtering an interference signal in one of the second optical signals, so that the n×m second filters filter the An interference signal in the second optical signal of n×m different wavelengths.
6. The communication system according to any one of claims 1 to 5, wherein the transmission direction of the first optical signal is a clockwise direction or a counterclockwise direction.
7. The communication system according to any one of claims 1 to 5, wherein each of the N communication units is a baseband unit;

   Alternatively, each of the N communication units is a distribution unit.
8. The communication system according to claim 7, wherein, if each communication unit is the baseband unit, the communication system further comprises a main control unit;

   If each of the communication units is the distribution unit, determining that any one of the N communication units is the main control unit;

   The main control unit is used for:

   determining the default wavelength information according to the number of the N communication units;

   The default wavelength information is sent to the second communication unit through the communication interface.
9. A method for signal transmission, comprising:

   The main control unit determines the number of communication units included in the communication system;

   The main control unit determines the wavelength default information of each communication unit according to the number of the communication units, and the default wavelength information includes the initial communication unit and the target communication unit of the optical signal;

   The main control unit sends the wavelength default information to each communication unit through the communication interface of each communication unit, so that each communication unit performs signal transmission according to the default wavelength information.
10. The method according to claim 9, wherein the determining the wavelength default information of each communication unit according to the number of the communication units comprises:

    If the number of the communication units is 2n, it is determined that the wavelength default information includes receiving n×m optical signals of different wavelengths, and sending (n−1)×m optical signals of different wavelengths, n≥2, and n is an integer, m≥1, and m is an integer.
11. The method according to claim 9, wherein the determining the wavelength default information of each communication unit according to the number of the communication units comprises:

    If the number of the communication units is 2n, it is determined that the wavelength default information is to receive (n-1)×m optical signals of different wavelengths, and to transmit n×m optical signals of different wavelengths, n≥2, and n is an integer, m≥1, and m is an integer.
12. The method according to claim 9, wherein the determining the wavelength default information of each communication unit according to the number of the communication units comprises:

    If the number of the communication units is 2n+1, it is determined that the wavelength default information is to receive n×m optical signals of different wavelengths, and to transmit n×m optical signals of different wavelengths, n≥2, and n is an integer , m≥1, and m is an integer.
13. A main control unit, characterized in that, comprising:

    processors, memories, input and output devices, and buses;

    the processor, the memory, and the input/output device are connected to the bus;

    The processor is adapted to perform the method of any one of claims 9 to 12.
14. A computer-readable storage medium, wherein a program is stored in the computer-readable storage medium, and when the computer executes the program, the method according to any one of claims 9 to 12 is executed.

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