WO2023029831A1 - Optical communication system, optical communication method and optical signal switching apparatus - Google Patents

Abstract

Provided in the present application is an optical communication system, which is applied to the field of optical communications. In the optical communication system, N transmitters are used for sending N first optical signals to an optical signal switching apparatus; the optical signal switching apparatus is used for dividing each first optical signal into X wave band signals of different wave bands to obtain X*N wave band signals, wherein each of the X wave band signals carries the same digital electrical signal, and X is an integer greater than 1 and less than or equal to M; the optical signal switching apparatus is also used for obtaining M second optical signals according to the X*N wave band signals; and M receivers are used for receiving the M second optical signals from the optical signal switching apparatus. In the present application, a first optical signal is divided into X wave band signals, such that an optical signal switching apparatus can directly send different wave band signals to different receivers, without the need to perform optical-electrical conversion, thereby reducing a communication delay between a transmitter and a receiver.

Description

Optical communication system, optical communication method and optical signal switching device

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office of China on August 30, 2021, with the application number 202111007638.4, and the title of the application is "Optical Communication System, Optical Communication Method, and Optical Signal Exchange Device", the entire content of which is passed References are incorporated in this application.

technical field

The present application relates to the field of optical communication, in particular to an optical communication system, an optical communication method and an optical signal exchange device.

Background technique

In the field of optical communication, an optical communication system can realize multipoint-to-multipoint communication through multiple switches. For example, FIG. 1 is a schematic structural diagram of an optical communication system. As shown in Fig. 1, the optical communication system includes three switches. The three switches are switch 101, switch 102, and switch 103, respectively. The switch 101 is respectively connected to the switch 102 and the switch 103 through optical fibers. The optical communication system further includes a transmitter 104 , a transmitter 105 , a receiver 106 and a receiver 107 . The switch 102 is respectively connected to the transmitter 104 and the transmitter 105 through optical fibers. The switch 103 is respectively connected to the receiver 106 and the receiver 107 through optical fibers. Three switches enable communication between multiple points (transmitter 104 and transmitter 105) and multiple points (receiver 106 and receiver 107). Specifically, the optical signal output by the transmitter 104 can reach the receiver 106 or the receiver 107 through three switches. The optical signal output by the transmitter 105 can reach the receiver 106 or the receiver 107 through three switches. Each switch is used to convert the received optical signal into an electrical signal, convert the electrical signal into an optical signal, and output an optical signal.

In the aforementioned optical communication system, each switch needs to perform a photoelectric conversion on the optical signal, which results in a relatively high communication delay between the transmitter and the receiver.

Contents of the invention

The present application provides an optical communication system, an optical communication method, and an optical signal exchange device. By dividing the first optical signal into X band signals, the optical signal exchange device can directly send signals of different bands to Different receivers, thereby reducing the communication delay between the transmitter and the receiver.

The first aspect of the present application provides an optical communication system. The optical communication system includes N transmitters, optical signal switching devices and M receivers. Both N and M are integers greater than 1. The N transmitters are used to send the N first optical signals to the optical signal switching device. The N first optical signals are in one-to-one correspondence with the N transmitters. The optical signal exchanging device is used for dividing each first optical signal into X band signals of different bands to obtain X×N band signals. Each of the X band signals carries the same digital electrical signal. X is an integer greater than 1 and less than or equal to M. The optical signal exchanging device is also used to obtain M second optical signals according to the X×N band signals. The M receivers are used to receive M second optical signals from the optical signal switching device. The M second optical signals are in one-to-one correspondence with the M receivers. It should be understood that for different first optical signals, the value of X may be different. For example, the N first optical signals include optical signal 1 and optical signal 2 . The optical signal exchange device is used to divide the optical signal 1 into 2 band signals. At this point, the value of X is 2. The optical signal switching device is used to divide the optical signal 2 into 3 band signals. At this time, the value of X is 3.

In the present application, the optical signal exchange device divides the first optical signal into X band signals. The optical signal switching device can directly send signals of different bands to different receivers without performing photoelectric conversion. Therefore, the present application can reduce the communication delay between the transmitter and the receiver.

In an optional manner of the first aspect, the wavelength ranges of the N first optical signals are the same. Wherein, when the wavelength ranges of the N first optical signals are the same, the N transmitters can use light sources that generate the same wavelength band, thereby reducing the later operation and maintenance costs of the optical communication system.

In an optional form of the first aspect, X is equal to M. The optical signal switching device is used for multiplexing M×N band signals to obtain M second optical signals. Each second optical signal includes N band signals of different bands. The N band signals are respectively derived from the N first optical signals. Wherein, each receiver can receive the second optical signal with N band signals. N band signals come from N transmitters respectively. In this case, the optical signal exchange device may be a passive optical device. For example, the optical signal switching device may be an arrayed waveguide grating router (arrayed waveguide grating router, AWGR). Therefore, the present application can reduce the cost of the optical signal switching device.

In an optional manner of the first aspect, the N first optical signals are in one-to-one correspondence with different N top tone signals. The N band signals of the second optical signal carry different N top-tuning signals. The N band signals of the second optical signal are in one-to-one correspondence with the N top-tuning signals. Each receiver also includes a first mapping. The first mapping relationship includes a mapping relationship between N top-tuning signals and N transmitters. Each receiver is also used to select and modulate the target band signal according to the first mapping relationship. The target band signal is one or more band signals in the N band signals of the second optical signal. Wherein, each receiver can receive the second optical signal with N band signals. Therefore, the receiver may receive unwanted band signals. At this time, the receiver needs to discard unnecessary band signals. Specifically, the receiver can demodulate N band signals by processing resources to obtain N analog electrical signals. The receiver converts the N analog electrical signals into N digital electrical signals of the physical layer through processing resources. The N digital electrical signals are in one-to-one correspondence with the N analog electrical signals. The receiver converts N digital electrical signals into N data packets at the data link layer or network layer. There is a one-to-one correspondence between the N digital electrical signals and the N data packets. The receiver reads a transmitter's identification in each data telegram. The receiver discards unnecessary data packets according to the identity of the transmitter. If the receiver includes the first mapping relationship, the receiver is further configured to select the target band signal for modulation according to the first mapping relationship. At this time, the receiver may discard unnecessary digital electrical signals among the N digital electrical signals at the physical layer, thereby saving processing resources of the receiver.

In an optional manner of the first aspect, the N transmitters correspond to different N electrophysical resources. Each receiver includes a second mapping. The second mapping relationship includes a mapping relationship between N electrical physical resources and N transmitters. The N electrophysical resources are in one-to-one correspondence with the N band signals of the second optical signal. Each receiver is also used to obtain N analog electrical signals according to the N band signals of the second optical signal. The N analog electrical signals are in one-to-one correspondence with the N band signals. Each receiver is further configured to select and mediate the analog electrical signal carried on the target electrophysical resource among the N analog electrical signals according to the second mapping relationship. The target electrophysical resource is one or more electrophysical resources in the N electrophysical resources. Wherein, if the receiver includes the second mapping relationship, the receiver is used to select and mediate the analog electrical signal carried on the target electrical physical resource according to the second mapping relationship. At this time, the receiver may discard unnecessary analog electrical signals among the N analog electrical signals, thereby saving processing resources of the receiver.

In an optional form of the first aspect, X is smaller than N. The optical signal switching device is used for selectively combining part of the M×N band signals to obtain M second optical signals. Wherein, the optical communication system can selectively send part of the N band signals to the receiver by controlling the optical signal switching device. Therefore, the present application can improve the security of the optical communication system. In practical applications, the optical signal switching device may be a wavelength selective switch (wavelength selective switch, WSS).

In an optional manner of the first aspect, the optical signal switching apparatus is further configured to configure the value of M according to the number of receivers. Wherein, the optical signal exchanging device may divide the first optical signal into different numbers of band signals according to different numbers of receivers. For example, when the number M of receivers is 2, the optical signal switching device is used to divide the first optical signal into two band signals of different bands. When the number M of receivers is 4, the optical signal switching device is used to divide the first optical signal into 4 band signals of different bands. Therefore, the present application can improve the flexibility of communication.

In an optional manner of the first aspect, the N transmitters are further configured to obtain the N first optical signals according to the N first electrical signals. The N first electrical signals are in one-to-one correspondence with the N first optical signals. The N first electrical signals are in one-to-one correspondence with different N electrical physical resources. Wherein, by configuring different X electrophysical resources for the X band signals in the second optical signal, the crosstalk between the X band signals can be reduced, and the reliability of communication can be improved.

In an optional manner of the first aspect, the N electrophysical resources are N subcarriers. Any two subcarriers in the N subcarriers are orthogonal. The N transmitters are also used to map the N digital electrical signals onto the N subcarriers to obtain N first electrical signals. There is a one-to-one correspondence between the N digital electrical signals and the N subcarriers. Wherein, the crosstalk between signals of the X bands can be reduced by using different sub-carriers, and the reliability of communication can be improved.

In an optional manner of the first aspect, the N electrophysical resources are N spreading codes. Any two spreading codes among the N spreading codes are orthogonal. The N transmitters are also used to encode the N digital electrical signals by using the N spreading codes to obtain N first electrical signals. There is a one-to-one correspondence between the N digital electrical signals and the N spreading codes. Wherein, the crosstalk between signals of the X bands can be reduced by using different spreading codes, and the reliability of communication can be improved.

In an optional manner of the first aspect, the N first optical signals are wide-spectrum signals.

In an optional manner of the first aspect, the optical communication system is a vehicle communication system, a data center system, an Internet of Things system or an industrial interconnection system.

The present application provides an optical communication method in a second aspect. The optical communication method includes the following steps: the optical signal switching device receives N first optical signals from N transmitters. The N first optical signals are in one-to-one correspondence with the N transmitters. N is an integer greater than 1. The optical signal switching device divides each first optical signal into X band signals of different bands. Get X×N band signals. Each of the X band signals carries the same digital electrical signal. The optical signal exchanging device obtains M second optical signals according to the X×N band signals. M is a positive integer greater than 1. X is an integer greater than 1 and less than or equal to M. The optical signal switching device sends M second optical signals to M receivers. The M second optical signals are in one-to-one correspondence with the M receivers.

In an optional manner of the second aspect, the wavelength ranges of the N first optical signals are the same.

In an optional form of the second aspect, X is equal to M. The optical signal switching device multiplexes the M×N band signals to obtain M second optical signals. Each second optical signal includes N band signals of different bands. The N band signals are respectively derived from the N first optical signals. In an optional manner of the second aspect, the N first optical signals are in one-to-one correspondence with the different N top-tuning signals. The N band signals carry different N top-tuning signals. There is a one-to-one correspondence between the N band signals and the N top-tuning signals. Each receiver includes a first mapping. The first mapping relationship includes a mapping relationship between N top-tuning signals and N transmitters. The first mapping relationship is used for each receiver to select and modulate the target band signal according to the first mapping relationship. The target band signal is one or more band signals in the N band signals. In an optional manner of the second aspect, the N transmitters correspond to different N electrophysical resources. Each receiver includes a second mapping. The second mapping relationship includes a mapping relationship between N electrical physical resources and N transmitters. The N electrophysical resources are in one-to-one correspondence with the N band signals of the second optical signal. The second mapping relationship is used for each receiver to select and mediate the analog electrical signal carried on the target electrophysical resource among the N analog electrical signals according to the second mapping relationship. The target electrophysical resource is one or more electrophysical resources in the N electrophysical resources. The N analog electrical signals are obtained from the N band signals.

In an optional form of the second aspect, X is equal to M. The optical signal switching device selectively multiplexes part of the M×N band signals to obtain M second optical signals. In an optional manner of the second aspect, the optical communication method further includes the following step: the optical signal switching device configures the value of M according to the number of receivers.

In an optional manner of the second aspect, the N first optical signals are obtained according to the N first electrical signals. The N first electrical signals are in one-to-one correspondence with the N first optical signals. The N first electrical signals are in one-to-one correspondence with different N electrical physical resources.

In an optional manner of the second aspect, the N electrophysical resources are N subcarriers. Any two subcarriers in the N subcarriers are orthogonal.

In an optional manner of the second aspect, the N electrophysical resources are N spreading codes. Any two spreading codes among the N spreading codes are orthogonal.

In an optional manner of the second aspect, the N first optical signals are wide-spectrum signals.

In an optional manner of the second aspect, the optical communication method is applied to a vehicle communication system, a data center system, an Internet of Things system or an industrial interconnection system.

The third aspect of the present application provides an optical signal switching device. The optical signal switching device includes a receiving port, a switching module and a sending port. The receiving port is used for receiving N first optical signals from N transmitters. The N first optical signals are in one-to-one correspondence with the N transmitters. N is an integer greater than 1. The switching module is used to divide each first optical signal into X band signals of different bands to obtain X×N band signals. Each of the X band signals carries the same digital electrical signal. The switching module is also used to obtain M second optical signals according to the X×N band signals. M is a positive integer greater than 1. X is an integer greater than 1 and less than or equal to M. The sending port is used to send M second optical signals to M receivers. The M second optical signals are in one-to-one correspondence with the M receivers.

In an optional form of the third aspect, X is equal to M. The switching module is used for multiplexing the M×N band signals to obtain M second optical signals. Each second optical signal includes N band signals of different bands. The N band signals are respectively derived from the N first optical signals.

In an optional manner of the third aspect, the N first optical signals are in one-to-one correspondence with different N top tone signals. The N band signals carry different N top-tuning signals. There is a one-to-one correspondence between the N band signals and the N top-tuning signals. Each receiver includes a first mapping. The first mapping relationship includes a mapping relationship between N top-tuning signals and N transmitters. The first mapping relationship is used for each receiver to select and modulate the target band signal according to the first mapping relationship. The target band signal is one or more band signals in the N band signals.

In an optional manner of the third aspect, the N transmitters correspond to different N electrophysical resources. Each receiver includes a second mapping. The second mapping relationship includes a mapping relationship between N electrical physical resources and N transmitters. The N electrophysical resources are in one-to-one correspondence with the N band signals of the second optical signal. The second mapping relationship is used for each receiver to select and mediate the analog electrical signal carried on the target electrophysical resource among the N analog electrical signals according to the second mapping relationship. The target electrophysical resource is one or more electrophysical resources in the N electrophysical resources. The N analog electrical signals are obtained from the N band signals.

In an optional form of the third aspect, X is equal to M. The switching module is used to selectively combine some of the M×N band signals to obtain M second optical signals.

In an optional manner of the third aspect, the switching module is further configured to configure the value of M according to the number of receivers.

In an optional manner of the third aspect, the N first optical signals are obtained according to the N first electrical signals. The N first electrical signals are in one-to-one correspondence with the N first optical signals. The N first electrical signals are in one-to-one correspondence with different N electrical physical resources.

In an optional manner of the third aspect, the N electrophysical resources are N subcarriers. Any two subcarriers in the N subcarriers are orthogonal.

In an optional manner of the third aspect, the N electrophysical resources are N spreading codes. Any two spreading codes among the N spreading codes are orthogonal.

In an optional manner of the third aspect, the N first optical signals are wide-spectrum signals.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical communication system;

Fig. 2a is the first schematic structural diagram of the optical communication system provided in this application;

Figure 2b is a second structural schematic diagram of the optical communication system provided in this application;

Fig. 3 is the first schematic structural diagram of the optical signal switching device provided in the present application;

FIG. 4 is a second structural schematic diagram of the optical signal exchange device provided in this application;

FIG. 5 is a third structural schematic diagram of the optical signal exchange device provided in this application;

FIG. 6 is a fourth structural schematic diagram of the optical signal exchange device provided in this application;

FIG. 7 is a third structural schematic diagram of the optical communication system provided in this application;

FIG. 8 is a fourth structural schematic diagram of the optical communication system provided in this application;

FIG. 9 is a fifth structural schematic diagram of the optical communication system provided in this application;

FIG. 10 is a schematic flowchart of an optical communication method provided in this application;

Fig. 11 is a fifth structural schematic diagram of the optical signal switching device provided in this application.

Detailed ways

The present application provides an optical communication system, an optical communication method and an optical signal exchange device. In the present application, the optical signal exchange device divides the first optical signal into X band signals. The optical signal switching device can directly send signals of different bands to different receivers without performing photoelectric conversion. Therefore, the present application can reduce the communication delay between the transmitter and the receiver. It should be understood that "first", "second", "target" and the like used in this application are only used for the purpose of distinguishing and describing, and cannot be interpreted as indicating or implying relative importance, nor indicating or implying order. In addition, reference numerals and/or letters are repeated in the various figures of this application for the sake of brevity and clarity. Repetition does not imply a strictly limited relationship between the various embodiments and/or configurations.

The optical communication system in this application can be applied in the field of optical communication. For example, in-vehicle communication systems, data center systems, Internet of Things systems, industrial interconnection systems, and optical access systems in the field of optical communications. In the field of optical communication, an optical communication system can realize multipoint-to-multipoint communication through multiple switches. However, each of the multiple switches needs to perform an optical-to-electrical conversion on the optical signal, which results in a high communication delay between the transmitter and the receiver.

To this end, the present application provides an optical communication system. The optical communication system includes N transmitters, optical signal switching devices and M receivers. Both N and M are integers greater than 1. The receiver and transmitter can be switches, routers, servers, in-vehicle communication modules or optical access devices, etc. Each transmitter is used to send a first optical signal to the optical signal switching device. The optical signal exchange device is used for receiving N first optical signals from N transmitters. The optical signal exchanging device is used for dividing each first optical signal into X waveband signals of different wavebands to obtain X×N waveband signals. Each of the X band signals carries the same digital electrical signal. X is an integer greater than 1 and less than or equal to M. The optical signal exchanging device is also used to obtain M second optical signals according to the X×N band signals. The optical signal switching device is used to respectively send a second optical signal to the N transmitters. The M receivers are used to receive M second optical signals from the optical signal switching device.

In the present application, the optical signal exchange device divides the first optical signal into X band signals. The optical signal switching device can directly send signals of different bands to different receivers without performing photoelectric conversion. Therefore, the present application can reduce the communication delay between the transmitter and the receiver.

In the present application, both N and M are integers greater than 1. X is an integer greater than 1 and less than or equal to M. The following describes the optical communication system in this application by taking N, M, and X equal to 2 as an example. Specifically, Fig. 2a is a first structural schematic diagram of the optical communication system provided in this application. As shown in Fig. 2a, the optical communication system includes 2 transmitters, an optical signal switching device 200 and 2 receivers. The 2 transmitters include transmitter 201 and transmitter 202 . The 2 receivers include receiver 203 and receiver 204 . The transmitter 201 is configured to send the first optical signal to the optical signal switching device 200 . Similarly, the transmitter 202 is configured to send another first optical signal to the optical signal switching device 200 . The optical signal switching device 200 is used for receiving two first optical signals from two transmitters. The optical signal switching device 200 is configured to divide each first optical signal into 2 band signals of different bands to obtain 2×2 band signals. Specifically, the optical signal switching apparatus 200 is configured to divide the first optical signal into two band signals. The two band signals are λa1 and λa2 respectively. λa1 and λa2 carry the same digital electrical signal. Suppose λa1 and λa2 carry data a. Similarly, the optical signal switching apparatus 200 is used to divide another first optical signal into two band signals. The two band signals are λb1 and λb2 respectively. λb1 and λb2 carry the same digital electrical signal. Suppose λb1 and λb2 carry data b.

In Fig. 2a, each of the 2×2 band signals is a continuous spectrum signal. For example, the wavelength range of λa1 is 1520 nm (nanometre, nm)˜1525 nm. The wavelength range of λa2 is 1525nm～1530nm. At this time, the wavelength range of the first optical signal is 1520nm˜1530nm. It should be understood that in practical applications, the first optical signal may not be a continuous spectrum signal. For example, the wavelength ranges of the first optical signal are 1520nm˜1525nm and 1530nm˜1535nm. At this time, the wavelength range of λa1 is 1520 nm to 1525 nm. The wavelength range of λa2 is 1530nm～1535nm.

In practical applications, each band signal may also be a single-wavelength wavelength signal. Specifically, Fig. 2b is a second structural schematic diagram of the optical communication system provided in this application. As shown in FIG. 2b, λa1, λa2, λb1 and λb2 are single-wavelength wavelength signals. For example, the wavelength of λa1 is 1525 nm. The wavelength of λa2 is 1530nm.

The optical signal switching device 200 is further configured to obtain M second optical signals according to the 2×2 band signals. Wherein, in FIG. 2a and FIG. 2b, the second optical signal received by the receiver 203 includes signals in two bands. The two band signals are λa1 and λb2 respectively. λa1 and λb2 have different band ranges. At this time, the receiver 203 has received data a and data b. The second optical signal received by the receiver 204 also includes signals of two bands. The two band signals are λb1 and λa2 respectively. λb1 and λa2 have different bands. At this time, the receiver 204 has received data a and data b.

In this application, the optical signal switching apparatus 200 may divide the first optical signal into X band signals. Therefore, the first optical signal is an optical signal including X band signals. The optical signal exchanging apparatus 200 is used for receiving a first optical signal including signals of X bands from a receiver.

According to the foregoing description, X is an integer less than or equal to M. When X is equal to M, the optical signal switching device 200 may be a combination of a demultiplexer and a multiplexer. For example, FIG. 3 is a first structural schematic diagram of an optical signal switching device provided in this application. As shown in FIG. 3 , the optical signal switching device 200 includes a demultiplexer 301 , a demultiplexer 302 , a multiplexer 303 and a multiplexer 304 . The demultiplexer 301 is used for receiving the first optical signal from a transmitter (not shown in the figure). The first optical signal includes 2 band signals. The two band signals are λa1 and λa2 respectively.

The demultiplexer 301 is used to divide the first optical signal into two band signals. Similarly, the demultiplexer 302 is used to receive another first optical signal from another transmitter (not shown in the figure). Another first optical signal includes 2 band signals. The two band signals are λb1 and λb2 respectively. The demultiplexer 302 is used to divide another first optical signal into two band signals. The multiplexer 303 is used to receive λa1 and λb2. The multiplexer 303 is used for multiplexing λa1 and λb2 to obtain a second optical signal. The multiplexer 303 is used to output the second optical signal to a receiver (not shown in the figure). It should be understood that when the signals in each band are continuous spectrum signals, the multiplexer 303 performs multiplexing in units of one wavelength range. When each band signal is a single-wavelength wavelength signal, the multiplexer 303 performs multiplexing in units of one or more wavelengths. Similarly, the multiplexer 304 is used to receive λb1 and λa2. The multiplexer 304 is used for multiplexing λb1 and λa2 to obtain a second optical signal. The multiplexer 304 is used to output the second optical signal to another receiver (not shown in the figure).

When X is an integer equal to M, the optical signal switching device 200 may also be an arrayed waveguide grating router (arrayed waveguide grating router, AWGR). In AWGR, band signals have the characteristic of loop routing. The loop routing can ensure that there is no band signal of the same band in each second optical signal, thereby reducing beat frequency interference. The following describes the AWGR by taking N and M equal to 4 as an example. Fig. 4 is a second structural schematic diagram of the optical signal switching device provided in this application. As shown in FIG. 4 , the optical signal switching device 400 includes a 4×4 AWGR 401. The 4×4 AWGR 401 includes four input ports and four output ports. The four input ports are input ports 1-4 respectively. The four output ports are output ports 1-4 respectively. Each input port is used to receive a first optical signal from the transmitter. The first optical signal received by the input port 1 includes signals of 4 bands. The four band signals are respectively λa1～λa4. λa1 to λa4 carry the same data a. Similarly, the first optical signal received by the input port 2 includes signals of 4 bands. The four band signals are λb1~λb4 respectively. λb1 to λb4 carry the same data b. The first optical signal received by the input port 3 includes signals of 4 bands. The four band signals are λc1~λc4 respectively. λc1 to λc4 carry the same data c. The first optical signal received by the input port 4 includes signals of 4 bands. The four band signals are respectively λd1～λd4. λd1 to λd4 carry the same data d.

AWGR 401 is used to divide each first optical signal into 4 band signals to obtain 4×4 band signals. AWGR 401 is used to combine 4×4 band signals to obtain 4 second optical signals. The four output ports are used to output four second optical signals. Specifically, the second optical signal output from the output port 1 includes λa1, λb2, λc3 and λd4. The second optical signal output from the output port 2 includes λd1, λa2, λb3 and λc4. The second optical signal output from the output port 3 includes λc1, λd2, λa3 and λb4. The second optical signal output from the output port 4 includes λb1, λc2, λd3 and λa4. Therefore, each second optical signal carries data a, data b, data c and data d respectively. In addition, each second optical signal does not include signals of the same wavelength band.

When the AWGR includes two input ports and two output ports, the AWGR can implement similar functions to the optical signal switching device in FIG. 3 . Specifically, the two input ports are input port 1 and input port 2 respectively. Input port 1 is used to receive a first optical signal from a transmitter. The first optical signal includes 2 band signals. The two band signals are λa1 and λa2 respectively. The input port 2 is used to receive another first optical signal from another transmitter. Another first optical signal includes 2 band signals. The two band signals are λb1 and λb2 respectively. The AWGR is used to demultiplex the two first optical signals to obtain 2×2 band signals. The 2×2 band signals are λa1, λa2, λb1 and λb2, respectively. The AWGR is used for multiplexing 2×2 band signals to obtain 2 second optical signals. The two output ports are output port 1 and output port 2, respectively. The output port 1 is used to output one of the second optical signals. The second optical signal includes λa1 and λb1. The output port 2 is used to output another second optical signal. Another second optical signal includes λb1 and λa2. Among them, compared with the optical signal exchange device shown in FIG. 3 , the cost of the AWGR is lower, so that the cost of the optical communication system can be reduced.

When X is an integer smaller than M, the optical signal switching device 200 may be a combination of a demultiplexer, an optical switch and a multiplexer. The wave splitter is used to divide the N first optical signals into N×M band signals. The optical switch and the multiplexer are used for selectively multiplexing part of the N×M band signals to obtain M second optical signals. For example, FIG. 5 is a third structural schematic diagram of an optical signal switching device provided in this application. As shown in FIG. 5 , on the basis of FIG. 3 , the optical signal switching device 200 further includes optical switches 501 - 504 . When the optical switch 501 and the optical switch 502 are in the on state, the second optical signal output by the multiplexer 303 includes λa1 and λb2. When the optical switch 501 is in the conducting state and the optical switch 502 is in the blocking state, the second optical signal output by the multiplexer 303 includes λa1. When the optical switch 501 is in the blocking state and the optical switch 502 is in the conducting state, the second optical signal output by the multiplexer 303 includes λb2. The optical switches 503 and 504 have similar functions, see the optical transmission path in FIG. 5 for details. Wherein, by adding an optical switch, the band signal of the second optical signal can be flexibly controlled, thereby improving communication security.

When X is an integer smaller than M, the optical signal switching device 200 may also be a WSS. The WSS is used to divide the N first optical signals into N×M band signals. The WSS is used to selectively combine some of the N×M band signals to obtain M second optical signals. For example, FIG. 6 is a fourth schematic structural diagram of an optical signal switching device provided in this application. As shown in FIG. 6 , the optical signal switching device 200 includes a WSS 601. WSS 601 includes input port 1, input port 2, output port 1 and output port 2. Input port 1 is used to receive a first optical signal from a transmitter. The first optical signal includes 2 band signals. The two band signals are λa1 and λa2 respectively. The input port 2 is used to receive another first optical signal from another transmitter. Another first optical signal includes 2 band signals. The two band signals are λb1 and λb2 respectively. WSS 601 is used to demultiplex the two first optical signals to obtain 2×2 band signals. The 2×2 band signals are λa1, λa2, λb1 and λb2, respectively. WSS 601 is used to combine part of the 2×2 band signals to obtain 2 second optical signals. For example, in FIG. 6 , the output port 1 is used to output one of the second optical signals. The second optical signal includes λa1. The output port 2 is used to output another second optical signal. Another second optical signal includes λb1 and λa2. Wherein, compared with the optical signal switching device shown in FIG. 5 , the cost of the WSS is lower, so that the cost of the optical communication system can be reduced.

In practical applications, when the wavelength ranges of the N first optical signals are the same, the N transmitters can use light sources that generate the same wavelength band, thereby reducing the later operation and maintenance costs of the optical communication system. For example, in the foregoing examples of FIG. 2 a , FIG. 2 b , FIG. 3 , FIG. 5 or FIG. 6 , the band ranges of λa1 and λb1 are the same. λa2 and λb2 have the same band range. For example, in the aforementioned example of FIG. 4 , the band ranges of λa1 , λb1 , λc1 and λd1 are the same. λa2, λb2, λc2 and λd2 have the same band range. λa3, λb3, λc3 and λd3 have the same band range. λa4, λb4, λc4 and λd4 have the same band range. It should be understood that when the first optical signal is a wavelength signal of a single frequency point, it may be understood that the N first optical signals have the same wavelength band range as that the N first optical signals have the same wavelength.

It can be seen from the foregoing description that the receiver may receive the second optical signal with signals in multiple bands. For example, in Fig. 2a or Fig. 2b, the receiver 203 receives the second optical signal having 2 band signals. In order to reduce crosstalk between signals of multiple bands, signals of multiple bands may correspond to different electrical physical resources. At this time, the N transmitters are also used to obtain N first optical signals according to the N first electrical signals. The N first electrical signals are in one-to-one correspondence with different N electrical physical resources.

In an example, the N electrical physical resources may be N subcarriers of different electrical frequencies. Any two subcarriers in the N subcarriers are orthogonal. The optical communication system communicates based on the principle of frequency division multiple access (FDMA). For example, FIG. 7 is a third structural schematic diagram of the optical communication system provided in this application. As shown in FIG. 7 , the optical communication system includes two transmitters, an optical signal switching device 200 and two receivers. The 2 transmitters include transmitter 201 and transmitter 202 . The 2 receivers include receiver 203 and receiver 204 .

The transmitter 201 may include a mapping module, a digital-to-analog conversion module and a modulation module. The mapping module is used to map the digital signal a (abbreviated as data a) on the subcarrier P1. Exemplarily, the transmitter 201 may first perform constellation mapping processing on the acquired digital signal a. After the constellation mapping process, the transmitter 201 performs frequency shift (also referred to as frequency shift) processing to map the digital signal a on the subcarrier P1. Wherein, the transmitter 201 may receive raw data from a signal source. The transmitter 201 obtains a digital signal a according to the original data. When the original data is an analog signal, the digital signal a can be obtained by converting the analog signal received from the signal source. When the original data is a digital signal, the digital signal a may be a digital signal directly output by the signal source. The digital-to-analog conversion module is used to convert the digital signal a mapped on the subcarrier P1 into an analog signal a (also referred to as the first electrical signal). The modulation module is used for receiving the first light beam, and modulating the analog signal a on the first light beam to obtain the first light signal. The first optical signal includes two wavelength band signals λa1 and λa2. λa1 and λa2 respectively carry data a.

Similarly, the transmitter 202 may include a mapping module, a digital-to-analog conversion module, and a modulation module. The mapping module is used to map the digital signal b (referred to as data b for short) to the subcarrier P2. The digital-to-analog conversion module is used to convert the digital signal b mapped on the subcarrier P2 into an analog signal b (also referred to as the first electrical signal). The modulation module is used for receiving the first light beam, and modulating the analog signal b on the first light beam to obtain the first light signal. The first optical signal includes λb1 and λb2. λb1 and λb2 carry data b respectively.

The optical signal switching device 200 is configured to receive two first optical signals, and obtain two second optical signals according to the two first optical signals. The optical signal switching device 200 is used to output a second optical signal to the receiver 203 . The second optical signal received by the receiver 203 includes λa1 and λb2. Wherein, λa1 corresponds to subcarrier P1. λb2 corresponds to subcarrier P2. The optical signal switching device 200 is further configured to output another second optical signal to the receiver 204 . The second optical signal received by the receiver 204 includes λb1 and λa2. Wherein, λb1 corresponds to subcarrier P2. λa2 corresponds to subcarrier P1. For the description of the optical signal switching apparatus 200, reference may be made to the related descriptions in the preceding FIG. 2a to FIG. 6 .

In this application, the receiver 203 and/or the receiver 204 may acquire data in the second optical signal in an active or passive manner. The receiver 203 is taken as an example below to describe this. Specifically, in an optical communication system, when the optical signal switching device 200 can control the number of band signals output to the receiver 203, the receiver 203 can passively acquire data in the second optical signal. For example, the optical communication system includes the optical signal switching device shown in FIG. 5 or FIG. 6 . When the optical signal switching device 200 cannot control the number of band signals output to the receiver 203, the receiver 203 may actively acquire data in the second optical signal. For example, the optical communication system includes the optical signal switching device shown in FIG. 3 or FIG. 4 .

When the receiver 203 acquires data in the second optical signal in a passive manner, the band signal included in the second optical signal received by the receiver 203 is selected by the optical signal switching device 200 . At this time, all the band signals included in the second optical signal received by the receiver 203 are required to be received by the receiver 203, and the receiver 203 acquires data of all band signals in the second optical signal. At this time, the optical communication system may further include a control device. The control device is used to control the band signal output from the optical signal switching device 200 to the receiver 203. For example, in FIG. 2 a , the control device is used to control the optical signal switching apparatus 200 to output the second optical signal to the receiver 203 . The second optical signal received by the receiver 203 includes λa1 and λb2. The receiver 203 is used to convert the second optical signal into two analog signals. According to the foregoing description, it can be known that the second optical signal includes λa1 and λb2. λa1 carries data a. λb2 carries data b. Therefore, the two analog signals include analog signal a and analog signal b. Analog signal a is on subcarrier P1. Analog signal b is on subcarrier P2. The receiver 203 converts the analog signal a into a digital signal a. The receiver 203 converts the analog signal b into a digital signal b. The receiver 203 acquires digital signal a and digital signal b. For example, in FIG. 6 , the control device is used to control the optical signal switching apparatus 200 to output the second optical signal to the receiver 203 . The second optical signal includes λa1. The receiver 203 is used to convert the second optical signal into an analog signal a. The receiver 203 converts the analog signal a into a digital signal a. The receiver 203 acquires the digital signal a.

When the receiver 203 acquires data in the second optical signal in an active manner, the receiver 203 may selectively acquire data of part or all of the band signals in the second optical signal. At this time, the optical communication system may further include a control device. The receiver 203 may receive the first mapping relationship or the second mapping relationship from the control device. The receiver 203 selectively acquires data in the second optical signal according to the first mapping relationship or the second mapping relationship.

The first mapping relationship includes a mapping relationship between N top-tuning signals and N transmitters. For example, transmitter 201 corresponds to signal 1 tuned-up. The transmitter 201 is also configured to obtain the first optical signal according to the top tune signal 1 . For example, the tune-up signal 1 is a digital signal 1. Digital signal a includes digital signal 1 . Alternatively, the transmitter 201 converts the digital signal 1 into an analog signal 1 . After the transmitter 201 obtains the first optical signal by modulating the analog signal a, the transmitter 201 modulates the analog signal 1 onto the first optical signal, and outputs the modulated first optical signal. Each band signal in the first optical signal sent by the transmitter 201 includes a top-tuned signal 1 . Similarly, transmitter 202 corresponds to tone-up signal 2 . The transmitter 202 is also used to obtain the first optical signal according to the top signal 2 . Each band signal in the first optical signal sent by the transmitter 202 includes the top-tuned signal 2 . In the second optical signal received by the receiver 203, each band signal corresponds to a top tuning signal. For example, λa1 corresponds to the pitch signal 1. λb2 corresponds to the top tuning signal 2. The receiver 203 obtains the digital signal a according to λa1. If the digital signal a includes the tuned signal 1 , the receiver 203 determines that the digital signal a comes from the transmitter 201 . The receiver 203 obtains the digital signal b according to λb2. If the digital signal b includes the tuned signal 2 , the receiver 203 determines that the digital signal b is from the transmitter 202 . If the receiver 203 only needs to receive data b from the transmitter 202 . Then the receiver 203 can discard the digital signal a. If the receiver 203 needs to receive both the data b from the transmitter 202 and the data a from the transmitter 201 . Then the receiver 203 can acquire digital signal a and digital signal b.

The second mapping relationship includes different mapping relationships between N electrical physical resources and N transmitters. For example, transmitter 201 corresponds to electrophysical resource a. The transmitter 202 corresponds to the electrophysical resource b. For example, the electrophysical resource a is a subcarrier P1. The electrophysical resource b is a subcarrier P. The receiver 203 determines that the analog signal a mapped on the subcarrier P1 comes from the transmitter 201 . The receiver 203 determines that the analog signal b mapped on the subcarrier P2 comes from the transmitter 202 . If the receiver 203 only needs to receive data b from the transmitter 202 . Then the receiver 203 can discard the analog signal a. At this time, the target electrophysical resource is the subcarrier P2. If the receiver 203 needs to receive both the data b from the transmitter 202 and the data a from the transmitter 201 . Then the receiver 203 can obtain the digital signal a and the digital signal b according to the analog signal a and the analog signal b. At this time, the target electrophysical resources are the subcarrier P1 and the subcarrier P2.

In another example, the N electrophysical resources may be different N code resources. The code resource may be a spreading code, such as a digital spreading code. Any two spreading codes among the N spreading codes are orthogonal. The optical communication system communicates based on the principle of code division multi-access (CDMA). For example, Fig. 8 is a fourth structural schematic diagram of the optical communication system provided in this application. As shown in FIG. 8 , the optical communication system includes two transmitters, an optical signal switching device 200 and two receivers. The 2 transmitters include transmitter 201 and transmitter 202 . The 2 receivers include receiver 203 and receiver 204 .

The transmitter 201 may include a mapping module, an encoding module, a digital-to-analog conversion module and a modulation module. The mapping module is used to map the digital signal a onto subcarriers. Then, the encoding module is used to encode the digital signal a mapped on the subcarrier according to the spreading code Q1 to obtain the spreading digital signal a. The digital-to-analog conversion module is used to convert the spread-spectrum digital signal a into an analog signal a (also referred to as the first electrical signal). The modulation module is used for receiving the first light beam, and modulating the analog signal a on the first light beam to obtain the first light signal. The first optical signal includes λa1 and λa2. λa1 and λa2 respectively carry data a.

Similarly, the transmitter 202 may also include a mapping module, an encoding module, a digital-to-analog conversion module and a modulation module. The mapping module is used to map the digital signal b onto subcarriers. Then, the encoding module is used to encode the digital signal b mapped on the subcarrier according to the spreading code Q2 to obtain the spreading digital signal b. The digital-to-analog conversion module is used to convert the spread-spectrum digital signal b into an analog signal b (also referred to as the first electrical signal). The modulation module is used for receiving the first light beam, and modulating the analog signal b on the first light beam to obtain the first light signal. The first optical signal includes λb1 and λb2. λb1 and λb2 carry data b respectively.

The optical signal switching device 200 is configured to receive two first optical signals, and obtain two second optical signals according to the two first optical signals. The optical signal switching device 200 is used to output a second optical signal to the receiver 203 . The second optical signal received by the receiver 203 includes λa1 and λb2. Wherein, λa1 corresponds to the spreading code Q1. λb2 corresponds to the spreading code Q2. The optical signal switching device 200 is further configured to output another second optical signal to the receiver 204 . Another second optical signal includes λb1 and λa2. Among them, λb1 corresponds to the spreading code Q2. λa2 corresponds to the spreading code Q1. For the description of the optical signal switching apparatus 200, reference may be made to the related descriptions in the preceding FIG. 2a to FIG. 6 .

For the description of the receiver 203 and/or the receiver 204, reference may be made to the relevant description in the preceding FIG. 7 . For example, the receiver 203 may acquire data in the second optical signal in an active or passive manner. When the receiver 203 acquires the data in the second optical signal in an active manner, the receiver 203 may selectively acquire the data in the second optical signal through the first mapping relationship or the second mapping relationship.

According to the foregoing description, each transmitter can obtain the first optical signal by modulating the first light beam. The first beam of light and the first optical signal may be broad spectrum signals. The broad spectrum signal refers to the optical signal whose spectral range occupies more than K nanometers. For example, K may be any value from 1 to 10. The wide spectrum signal can be either a continuous spectrum optical signal or a discrete spectrum signal. A continuous spectrum optical signal has power at each frequency point within the spectral range. Discrete spectral signals only have power in several frequency points or several wavelength ranges in the spectral range.

When the broad spectrum signal is a continuous spectrum signal, each transmitter may also include a laser. A laser is used to generate the broad spectral first light beam. The laser may be an amplified spontaneous emission (amplified spontaneous emission, ASE) laser. When the wavelength ranges of the N first optical signals are the same, the N transmitters may share one laser. At this time, the optical communication system includes an optical splitter. A laser is used to generate the broad spectral first light beam. The beam splitter is used for splitting the broad-spectrum first light beam into N first light beams. A beam splitter is used to output a first light beam to each transmitter.

When the broad spectrum signal is a discrete spectrum signal, each transmitter may also include a light source module. The light source module includes a distributed feedback (DFB) laser. A DFB laser is used to generate a first light beam with M wavelengths. Each transmitter is used to modulate the first light beam to obtain first optical signals with M wavelengths. The light source module can also include a broadband laser and an optical collection comb. A broad-spectrum laser is used to generate a first light beam with M wavebands. The optical collecting comb is used to obtain the first light beams with M wavelengths according to the first light beams with M wavebands. Similarly, when the wavelength ranges of the N first optical signals are the same, N transmitters may share one light source module. At this time, the optical communication system includes an optical splitter. The light source module is used to generate first light beams with M wavelengths. The optical splitter is used to split the first beams of M wavelengths into N first beams. A beam splitter is used to output a first light beam to each transmitter. Each first light beam includes M wavelengths.

It can be seen from the foregoing description that N and M are integers greater than 1. Therefore, N and M may not be equal. Suppose N is equal to 2. M is equal to 3. At this point, FIG. 9 is a fifth structural schematic diagram of the optical communication system provided in this application. As shown in FIG. 9 , the optical communication system includes 2 transmitters, an optical signal switching device 900 and 3 receivers. The 2 transmitters include transmitter 901 and transmitter 902 . The 3 receivers include receiver 903 , receiver 904 and receiver 905 . The transmitter 901 is configured to send a first optical signal having signals of three bands to the optical signal switching device 900 . The three band signals are λa1, λa2 and λa3 respectively. λa1 , λa2 and λa3 carry the same digital electrical signal. Assume that λa1, λa2, and λa3 carry data a. Similarly, the transmitter 902 is configured to send another first optical signal having signals of three bands to the optical signal switching device 900 . The three band signals are λb1, λb2 and λb3 respectively. λb1, λb2 and λb3 carry the same digital electrical signal. Suppose λb1, λb2 and λb3 carry data b.

The optical signal switching device 900 is used for receiving two first optical signals from two transmitters. The optical signal exchanging device 900 is configured to divide each first optical signal into X band signals to obtain X×2 band signals. The optical signal exchanging device 900 is configured to obtain 3 second optical signals according to X×2 band signals. In FIG. 9, the value of X is 3. The 3×2 band signals are λa1, λa2, λa3, λb1, λb2, and λb3, respectively. The optical signal switching device 900 sends three second optical signals to three receivers. The second optical signal received by the receiver 903 includes signals of two bands. The two band signals are λa1 and λb2 respectively. λa1 and λb2 have different band ranges. At this time, the receiver 903 has received data a and data b. Similarly, the second optical signal received by the receiver 904 also includes signals of two bands. The two band signals are λa2 and λb3 respectively. The wavelength bands of λa2 and λb3 are different. At this time, the receiver 904 has received data a and data b. The second optical signal received by the receiver 905 also includes signals of two bands. The two band signals are λa3 and λb1 respectively. The wavelength bands of λa3 and λb1 are different. At this time, the receiver 905 has received data a and data b.

In FIG. 9, X is equal to M. In practical applications, X can be smaller than M. For example, X equals 2. At this time, the X×2 band signals include λa5, λa6, λb5 and λb6. The sum of the wavelength ranges of λa5 and λa6 is equal to the sum of the wavelength ranges of λa1, λa2 and λa3. For example, assume that the wavelength range of λa1 in FIG. 9 is 1520 nm˜1524 nm. The wavelength range of λa2 is 1524nm～1528nm. The wavelength range of λa3 is 1528nm～1532nm. The wavelength ranges of the N first optical signals are the same. In this case, the wavelength range of λa5 may be 1520 nm˜1526 nm. The wavelength range of λa6 may be 1526nm˜1532nm. Similarly, the sum of the wavelength ranges of λb5 and λb6 is equal to the sum of the wavelength ranges of λb1, λb2 and λb3. The wavelength range of λb5 is the same as that of λa5. The wavelength range of Λb6 is the same as that of λa6. The optical signal switching device 900 obtains 3 second optical signals according to the X×2 band signals. For example, the second optical signal received by the receiver 903 includes the band signal λa5. At this time, the receiver 903 has received data a. Similarly, the second optical signal received by the receiver 904 also includes the band signal λb6. At this time, the receiver 904 has received data b. The second optical signal received by the receiver 905 also includes signals of two bands. The two band signals are λb5 and λa6 respectively. The wavelength bands of λb5 and λa6 are different. At this time, the receiver 905 has received data a and data b.

In practical applications, in order to improve the flexibility of communication, the optical signal switching device can configure the value of M according to the number of receivers. When X is equal to M, the value of X changes as M changes. For example, in FIG. 9 , the number of receivers is changed from 3 to 2. The 2 receivers include receiver 903 and receiver 904 . At this time, the optical signal exchange apparatus 900 can obtain λa5, λa6, λb5, and λb6 according to the two first optical signals. The second optical signal received by the receiver 903 includes λa5 and λb6. The second optical signal received by the receiver 904 includes λb5 and λa6.

It should be understood that the value of X may be different for different transmitters. For example, transmitter 901 corresponds to X1. Transmitter 902 corresponds to X2. The value of X1 is 2. The X2 value is 3. The optical signal switching device 900 is used to divide the first optical signal into λa7 and λa8. The sum of the wavelength ranges of λa7 and λa8 is equal to the sum of the wavelength ranges of λa1, λa2 and λa3. For example, assume that the wavelength range of λa1 in FIG. 9 is 1520 nm˜1524 nm. The wavelength range of λa2 is 1524nm～1528nm. The wavelength range of λa3 is 1528nm～1532nm. In this case, the wavelength range of λa7 may be 1520 nm˜1528 nm. The wavelength range of λa8 may be 1528nm-1532nm. The optical signal switching device 900 is used to divide another optical signal into λb1, λb2 and λb3. The wavelength range of λb1 is 1520nm-1524nm. The wavelength range of λb2 is 1524nm～1528nm. The wavelength range of λb3 is 1528nm～1532nm. The optical signal exchange device 900 obtains three second optical signals according to X1×2+X2×2 band signals. For example, the second optical signal received by the receiver 903 includes band signals λa7 and λb3. At this time, the receiver 903 has received data a and data b. Similarly, the second optical signal received by the receiver 904 also includes the band signal λb2. At this point, the receiver 904 has received data b. The second optical signal received by the receiver 905 includes band signals λb1 and λa8 respectively. At this time, the receiver 905 has received data a and data b.

It should be understood that, for the description in FIG. 9 , reference may be made to the relevant descriptions in the aforementioned FIGS. 2 a to 8 . For example, the optical signal switching device may be WSS, AWGR, etc. For example, receiver 904 may receive data in the second optical signal in an active or passive manner. For example, the first optical signal output by the transmitter 901 and the first optical signal output by the transmitter 902 correspond to different electrical physical resources. Electrophysical resources can be subcarriers or spreading codes.

The optical communication system in this application is described above. The optical communication method in this application is described below. Specifically, FIG. 10 is a schematic flowchart of the optical communication method provided in this application. As shown in Figure 10, the optical communication method in this application includes the following steps.

In step 1001, an optical signal switching device receives N first optical signals from N transmitters. Each first optical signal includes M waveband signals of different wavebands. Each of the M band signals carries the same digital electrical signal. The N first optical signals are in one-to-one correspondence with the N transmitters. Both N and M are integers greater than 1.

In step 1002, the optical signal switching device obtains M second optical signals according to the N first optical signals. Each second optical signal includes X band signals of different bands. The X band signals are respectively derived from the X first optical signals among the N first optical signals. X is an integer greater than 0 and less than or equal to N.

In step 1003, the optical signal exchange device sends M second optical signals to M receivers. The M second optical signals are in one-to-one correspondence with the M receivers.

It should be understood that, for the description in FIG. 10 , reference may be made to related descriptions in the foregoing optical communication system. For example, the optical signal switching device may be WSS, AWGR, etc. For example, the optical signal switching device may allow the receiver to acquire data in the second optical signal in an active or passive manner. When the optical signal exchange device enables the receiver to receive the data in the second optical signal in an active manner, the receiver acquires the data in the second optical signal in a passive manner. When the optical signal switching device passively enables the receiver to acquire the data in the second optical signal, the receiver actively acquires the data in the second optical signal. For example, for example, the first optical signal output by each transmitter corresponds to different electrical physical resources. Electrophysical resources can be subcarriers or spreading codes.

The optical communication method in this application is described above. The optical signal exchange device in this application is described below. Specifically, FIG. 11 is a fifth structural schematic diagram of the optical signal switching device provided in this application. As shown in FIG. 11 , an optical signal switching device 1100 includes a receiving port 1101 , a switching module 1102 and a sending port 1103 . The receiving port 1101 is used for receiving N first optical signals from N transmitters. The N first optical signals are in one-to-one correspondence with the N transmitters. N is an integer greater than 1. The switching module 1102 is configured to divide each first optical signal into X band signals of different bands to obtain X×N band signals. Each of the X band signals carries the same digital electrical signal. The switching module 1102 is further configured to obtain M second optical signals according to the X×N band signals. M is a positive integer greater than 1. X is an integer greater than 1 and less than or equal to M. The sending port 1103 is used to send M second optical signals to M receivers. The M second optical signals are in one-to-one correspondence with the M receivers.

It should be understood that, for the description in FIG. 11 , reference may be made to related descriptions in the aforementioned optical communication system. For example, the optical signal switching device may be WSS, AWGR, etc.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should cover Within the protection scope of this application.

Claims (31)

1. An optical communication system, characterized in that it comprises:

   N transmitters, optical signal switching devices and M receivers, where N and M are both integers greater than 1;

   The N transmitters are used to send N first optical signals to the optical signal exchange device, and the N first optical signals are in one-to-one correspondence with the N transmitters;

   The optical signal exchange device is used to divide each first optical signal into X band signals of different bands to obtain X×N band signals, each of the X band signals carrying the same digital signal signal, X is an integer greater than 1 and less than or equal to the M;

   The optical signal switching device is further configured to obtain M second optical signals according to the X×N band signals;

   The M receivers are configured to receive the M second optical signals from the optical signal exchange device, and the M second optical signals correspond to the M receivers one by one.
2. The optical communication system according to claim 1, wherein the X is equal to the M;

   The optical signal exchanging device for obtaining M second optical signals according to the X×N band signals includes:

   The optical signal exchange device is used to perform multiplexing on M×N band signals to obtain the M second optical signals, each second optical signal includes N band signals of different bands, and the N band signals are respectively derived from the N first optical signals.
3. The optical communication system according to claim 2, wherein the N first optical signals are in one-to-one correspondence with different N top tone signals, and the N band signals of the second optical signal carry different The N pitch-adjusting signals, the N band signals of the second optical signal correspond to the N pitch-tuning signals one-to-one;

   Each receiver also includes a first mapping relationship, where the first mapping relationship includes a mapping relationship between the N top-tuning signals and the N transmitters;

   Each receiver is further configured to select and modulate a target band signal according to the first mapping relationship, where the target band signal is one or more band signals in the N band signals of the second optical signal.
4. The optical communication system according to claim 2, wherein the N transmitters correspond to different N electrical physical resources;

   Each receiver includes a second mapping relationship, the second mapping relationship includes the mapping relationship between the N electrical physical resources and the N transmitters, and the N electrical physical resources and the second optical signal One-to-one correspondence of N band signals;

   Each receiver is also used to obtain N analog electrical signals according to the N band signals of the second optical signal;

   Each receiver is further configured to select and mediate an analog electrical signal carried on a target electrophysical resource among the N analog electrical signals according to the second mapping relationship, and the target electrophysical resource is the N electrophysical resource One or more electrophysical resources in .
5. The optical communication system according to claim 1, wherein the X is equal to the M;

   The optical signal exchanging device for obtaining M second optical signals according to the X×N band signals includes:

   The optical signal exchanging device is used for selectively combining part of the M×N band signals to obtain the M second optical signals.
6. The optical communication system according to any one of claims 1 to 5, wherein the optical signal switching device is further configured to configure the value of M according to the number of receivers.
7. The optical communication system according to any one of claims 1 to 6, wherein the N transmitters are further configured to obtain the N first optical signals according to the N first electrical signals, and the N The first electrical signals are in one-to-one correspondence with the N first optical signals, and the N first electrical signals are in one-to-one correspondence with N different electrical physical resources.
8. The optical communication system according to claim 7, wherein the N electrophysical resources are N subcarriers, and any two subcarriers in the N subcarriers are orthogonal;

   The N transmitters are further configured to map the N digital electrical signals on the N subcarriers to obtain the N first electrical signals, and the N digital electrical signals correspond to the N subcarriers one-to-one .
9. The optical communication system according to claim 7, wherein the N electrical physical resources are N spreading codes, and any two spreading codes in the N spreading codes are orthogonal;

   The N transmitters are also used to encode the N digital electrical signals by using the N spreading codes to obtain the N first electrical signals, and the N digital electrical signals and the N spreading codes are one One to one correspondence.
10. The optical communication system according to any one of claims 1 to 9, wherein the N first optical signals are wide-spectrum signals.
11. The optical communication system according to any one of claims 1 to 10, wherein the optical communication system is a vehicle communication system, a data center system, an Internet of Things system or an industrial interconnection system.
12. An optical communication method, characterized in that, comprising:

    The optical signal exchange device receives N first optical signals from N transmitters, and the N first optical signals correspond to the N transmitters one by one, and N is an integer greater than 1;

    The optical signal exchange device divides each first optical signal into X band signals of different bands to obtain X×N band signals, and each band signal in the X band signals carries the same digital electrical signal;

    The optical signal exchange device obtains M second optical signals according to the X×N band signals, M is a positive integer greater than 1, and X is an integer greater than 1 and less than or equal to the M;

    The optical signal exchanging device sends the M second optical signals to the M receivers, and the M second optical signals are in one-to-one correspondence with the M receivers.
13. The optical communication method according to claim 12, wherein the X is equal to the M;

    The optical signal switching device obtaining M second optical signals according to the X×N band signals includes:

    The optical signal switching device multiplexes the M×N band signals to obtain the M second optical signals, each second optical signal includes N band signals of different bands, and the N band signals are respectively sourced from for the N first optical signals.
14. The optical communication method according to claim 13, wherein the N first optical signals are in one-to-one correspondence with different N top-tuning signals, and the N band signals carry different N top-tuning signals. signal, the N band signals correspond to the N top-tuning signals one-to-one;

    Each receiver includes a first mapping relationship, where the first mapping relationship includes a mapping relationship between the N top-tuning signals and the N transmitters;

    The first mapping relationship is used for each receiver to select and modulate a target band signal according to the first mapping relationship, and the target band signal is one or more band signals in the N band signals.
15. The optical communication method according to claim 13, wherein the N transmitters correspond to different N electrical physical resources;

    Each receiver includes a second mapping relationship, the second mapping relationship includes the mapping relationship between the N electrical physical resources and the N transmitters, the N electrical physical resources and the second optical signal One-to-one correspondence of N band signals;

    The second mapping relationship is used for each receiver to select and mediate the analog electrical signal carried on the target electrophysical resource among the N analog electrical signals according to the second mapping relationship, and the target electrophysical resource is the N One or more electrophysical resources in the electrophysical resources, the N analog electrical signals are obtained from the N band signals.
16. The optical communication method according to claim 12, wherein the X is equal to the M;

    The optical signal switching device obtaining M second optical signals according to the X×N band signals includes:

    The optical signal exchange device selectively multiplexes part of the M×N band signals to obtain the M second optical signals.
17. The optical communication method according to any one of claims 12 to 16, wherein the method further comprises:

    The optical signal exchange device configures the value of M according to the number of receivers.
18. The optical communication method according to any one of claims 12 to 17, wherein the N first optical signals are obtained from the N first electrical signals, and the N first electrical signals and the The N first optical signals are in one-to-one correspondence, and the N first electrical signals are in one-to-one correspondence with different N electrical physical resources.
19. The optical communication method according to claim 18, wherein the N electrophysical resources are N subcarriers, and any two subcarriers in the N subcarriers are orthogonal.
20. The optical communication method according to claim 18, wherein the N electrophysical resources are N spreading codes, and any two spreading codes in the N spreading codes are orthogonal.
21. The optical communication method according to any one of claims 12 to 20, characterized in that the N first optical signals are wide-spectrum signals.
22. An optical signal exchange device, characterized in that it comprises:

    Receive port, switch module and send port;

    The receiving port is used to receive N first optical signals from N transmitters, and the N first optical signals are in one-to-one correspondence with the N transmitters, and N is an integer greater than 1;

    The switching module is used to divide each first optical signal into X band signals of different bands to obtain X×N band signals, and each band signal in the X band signals carries the same digital electrical signal;

    The switching module is also used to obtain M second optical signals according to the X×N band signals, M is a positive integer greater than 1, and X is an integer greater than 1 and less than or equal to the M;

    The sending port is used to send the M second optical signals to M receivers, and the M second optical signals are in one-to-one correspondence with the M receivers.
23. The apparatus of claim 22, wherein said X is equal to said M;

    The switching module is used to obtain M second optical signals according to the X×N band signals, including:

    The switching module is used to combine M×N band signals to obtain the M second optical signals, each second optical signal includes N band signals of different bands, and the N band signals are respectively sourced from for the N first optical signals.
24. The device according to claim 23, wherein the N first optical signals are in one-to-one correspondence with different N top-tuning signals, and the N band signals carry different N top-tuning signals, The N band signals are in one-to-one correspondence with the N top-tuning signals;

    Each receiver includes a first mapping relationship, where the first mapping relationship includes a mapping relationship between the N top-tuning signals and the N transmitters;

    The first mapping relationship is used for each receiver to select and modulate a target band signal according to the first mapping relationship, and the target band signal is one or more band signals in the N band signals.
25. The device according to claim 23, wherein the N transmitters correspond to different N electrical physical resources;

    Each receiver includes a second mapping relationship, the second mapping relationship includes the mapping relationship between the N electrical physical resources and the N transmitters, and the N electrical physical resources and the second optical signal One-to-one correspondence of N band signals;

    The second mapping relationship is used for each receiver to select and mediate the analog electrical signal carried on the target electrophysical resource among the N analog electrical signals according to the second mapping relationship, and the target electrophysical resource is the N One or more electrophysical resources in the electrophysical resources, the N analog electrical signals are obtained from the N band signals.
26. The apparatus of claim 22, wherein said X is equal to said M;

    The switching module is used to obtain M second optical signals according to the X×N band signals, including:

    The switching module is used to selectively combine some of the M×N band signals to obtain the M second optical signals.
27. Apparatus according to any one of claims 22 to 26, characterized in that,

    The switching module is further configured to configure the value of M according to the number of receivers.
28. The device according to any one of claims 22 to 27, wherein the N first optical signals are obtained from N first electrical signals, and the N first electrical signals and the N The first optical signals are in one-to-one correspondence, and the N first electrical signals are in one-to-one correspondence with different N electrical physical resources.
29. The device according to claim 28, wherein the N electrophysical resources are N subcarriers, and any two subcarriers in the N subcarriers are orthogonal.
30. The device according to claim 28, wherein the N electrophysical resources are N spreading codes, and any two spreading codes in the N spreading codes are orthogonal.
31. The device according to any one of claims 22 to 30, wherein the N first optical signals are wide-spectrum signals.

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