Optical communication system, method, related device, storage medium and program product

Abstract

The present application discloses an optical communication system, method, related device, storage medium and program product, which belongs to the field of communication technology. In order to realize the mixed insertion of optical modules, improve the flexibility of networking, and reduce the difficulty of equipment management and maintenance, in one implementation, the intermediate device divides the downstream optical signal with multiple downstream wavelengths into multiple ones, and transmits one of the divided downstream optical signals to each access side optical module. Even if the optical modules are mixed, the optical signals of the corresponding downstream wavelengths can be obtained from the received downstream optical signals. In another implementation, even if the optical modules are mixed, the intermediate device can still couple the received optical signals of multiple upstream wavelengths through an optical coupler and transmit them to the central optical module. Although this may cause a mismatch in the transmission and reception of one or some optoelectronic conversion submodules of the central optical module, the routing switching device can use the transceiver matching module to perform transmission and reception matching, thereby ensuring the reliability of optical communication.

Description

[0001] This application is a divisional application. The application number of the original application is 202410022086.1, and the original application date is January 5, 2024. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to an optical communication system, method, related device, storage medium and program product. Background Art

[0003] Optical communication refers to the transmission of optical signals that carry information through optical fibers. To ensure the quality of optical communication, optical fibers can be directly pulled into the user's room, thus achieving fiber-to-the-home. In a fiber-to-the-home scenario, optical fibers are pulled into rooms on each floor of the campus, and optical fibers are used to transmit uplink and downlink information between the optical access devices in the room and the central switch in the campus.

[0004] Optical access devices are usually connected to the central switch through a combiner / splitter. A central switch can communicate with multiple optical access devices through intermediate devices. Each optical access device is plugged with an optical module, and multiple optical modules are connected to the same combiner / splitter through optical fibers. The combiner / splitter is then connected to the central switch, thereby realizing optical communication between the multiple optical access devices and the central switch.

[0005] In the related art, a combiner / splitter has multiple ports, and the multiple ports correspond one-to-one to multiple pairs of wavelengths. Each pair of wavelengths includes an upstream wavelength and a downstream wavelength. The multiple pairs of wavelengths also correspond one-to-one to multiple optical modules. Among them, the optical fiber connected to the optical module needs to be inserted into the corresponding port according to the corresponding wavelength, that is, the multiple optical modules need to be aligned with the multiple ports and cannot be mixed. If mixed, for example, the upstream wavelength 1 corresponds to port 1 and optical module 1, and the upstream wavelength 2 corresponds to port 2 and optical module 2, if the optical fiber connected to optical module 1 is inserted into port 2, and the optical fiber connected to optical module 2 is inserted into port 1, it will cause port 1 and port 2 to receive optical signals with mismatched upstream wavelengths, then the combiner / splitter will not be able to process these mismatched optical signals, which will cause these optical signals to be unable to be transmitted to the central switch, thereby affecting optical communication.

[0006] It can be seen that multiple optical modules in the related art cannot be mixed, resulting in poor networking flexibility of optical communication, greater difficulty in equipment management and maintenance, and if the optical module is inserted into the wrong port, it will also affect the optical communication. Summary of the invention

[0007] The present application provides an optical communication system, method, related device, storage medium and program product, which can realize the mixed insertion of access side optical modules, improve the flexibility of optical networking, and reduce the difficulty of equipment management and maintenance. The technical solution is as follows:

[0008] In a first aspect, an optical communication system is provided, the optical communication system comprising a central optical module, an intermediate device and a plurality of access side optical modules, the central optical module is connected to the intermediate device via an optical fiber, the intermediate device comprises a plurality of ports, each of the plurality of access side optical modules is connected to any one of the plurality of ports via an optical fiber, different access side optical modules are connected to different ports, and each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths;

[0009] The central optical module is used to transmit a first downstream optical signal to the intermediate device, the first downstream optical signal having multiple downstream wavelengths, the multiple downstream wavelengths including at least one downstream wavelength corresponding to the access side optical module;

[0010] The intermediate device is used to receive the second downstream optical signal, divide the second downstream optical signal into a plurality of third downstream optical signals, and transmit a third downstream optical signal to the access side optical module connected to the port through each port of the plurality of ports, wherein the second downstream optical signal is an optical signal after the first downstream optical signal is transmitted through the optical fiber between the central optical module and the intermediate device, and each of the plurality of third downstream optical signals has a plurality of downstream wavelengths;

[0011] Each access side optical module among the multiple access side optical modules is used to receive a fourth downstream optical signal, and obtain an optical signal of a downstream wavelength corresponding to the access side optical module from the fourth downstream optical signal. The fourth downstream optical signal is an optical signal after the third downstream optical signal is transmitted through the optical fiber between the access side optical module and the port.

[0012] That is, in order to achieve mixed insertion of optical modules without affecting optical communication, improve the networking flexibility of optical communication, and reduce the difficulty of equipment management and maintenance, the intermediate device divides the second downstream optical signal with multiple downstream wavelengths into multiple ones, and obtains multiple third downstream optical signals each with multiple downstream wavelengths. One third downstream optical signal is transmitted to multiple access side optical modules through multiple ports. Even if multiple access side optical modules are mixed, they can obtain optical signals of their corresponding downstream wavelengths from the received downstream optical signals.

[0013] In a first implementation manner, the access-side optical module includes a first filter; the first filter is used to filter the fourth downlink optical signal to obtain an optical signal of a downlink wavelength corresponding to the access-side optical module.

[0014] The central optical module includes a first combiner, and the intermediate device also includes a first optical splitter, which is connected to multiple ports through optical fibers respectively; the first combiner is used to obtain optical signals of multiple downstream wavelengths, combine the optical signals of multiple downstream wavelengths into a first downstream optical signal, and transmit the first downstream optical signal to the first optical splitter; the first optical splitter is used to receive a second downstream optical signal, and divide the second downstream optical signal into multiple third downstream optical signals by energy splitting, and transmit one third downstream optical signal to each of the multiple ports.

[0015] Optionally, the intermediate device further includes a first optical splitter, the central optical module further includes a second optical splitter, the first optical splitter is connected to the second optical splitter and the first optical splitter respectively through optical fibers, and the second optical splitter is also connected to the first combiner through optical fibers; the first combiner is also used to transmit the first downstream optical signal to the second optical splitter; the second optical splitter is used to transmit the first downstream optical signal to the first optical splitter; the first optical splitter is used to receive the second downstream optical signal and transmit the second downstream optical signal to the first optical splitter. In this way, communication between the intermediate device and the central optical module can be achieved through a single optical cable connection, that is, communication is achieved through a single fiber.

[0016] Alternatively, the first combiner is connected to the first optical splitter via an optical fiber; the first combiner is also used to transmit the first downlink optical signal to the first optical splitter. In this way, the intermediate device and the central optical module can communicate via two optical cables, that is, communication is achieved via dual fibers.

[0017] In the present application, each access side optical module also corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths;

[0018] Each access side optical module among the multiple access side optical modules is also used to transmit an optical signal of an uplink wavelength corresponding to the access side optical module to the port to which the access side optical module is connected;

[0019] The intermediate device is also used to obtain optical signals of multiple upstream wavelengths transmitted by multiple access-side optical modules through multiple ports, combine the received optical signals of multiple upstream wavelengths into a first upstream optical signal, and transmit the first upstream optical signal to the central optical module;

[0020] The central optical module is also used to receive a second uplink optical signal and decompose the second uplink optical signal into optical signals of multiple uplink wavelengths. The second uplink optical signal is an optical signal of the first uplink optical signal transmitted through the optical fiber between the intermediate device and the central optical module.

[0021] The access side optical module also includes a first laser, which is connected to the port through an optical fiber; the first laser is used to generate an optical signal of an upstream wavelength corresponding to the access side optical module, and transmit the optical signal of the upstream wavelength to the connected port.

[0022] The intermediate device also includes a first optical coupler, the central optical module includes a first splitter, and the first optical coupler is connected to the multiple ports respectively through optical fibers; the first optical coupler is used to couple the optical signals of the multiple uplink wavelengths into a first uplink optical signal by energy merging;

[0023] The first splitter is used to split the second uplink optical signal into optical signals of multiple uplink wavelengths.

[0024] Optionally, the intermediate device also includes a first optical splitter, and the central optical module also includes a second optical splitter. The first optical splitter is connected to the second optical splitter and the first optical coupler respectively through optical fibers, and the second optical splitter is also connected to the first wave splitter through optical fibers; the first optical coupler is also used to transmit the first uplink optical signal to the first optical splitter; the first optical splitter is used to transmit the first uplink optical signal to the second optical splitter; the second optical splitter is used to receive the second uplink optical signal and transmit the second uplink optical signal to the first wave splitter. In this way, in terms of uplink and downlink, the communication between the intermediate device and the central optical module can be achieved through a single optical cable connection, that is, communication is achieved through a single fiber.

[0025] Alternatively, the first splitter is connected to the first optical coupler via an optical fiber; the first optical coupler is used to transmit the first uplink optical signal to the first splitter. In this way, in terms of uplink and downlink, the intermediate device and the central optical module can communicate by connecting two optical cables, that is, communicating by dual fibers.

[0026] In another implementation, the access side optical module includes a third optical splitter and a second filter, the third optical splitter is connected to the port and the second filter respectively through optical fibers; the third optical splitter is used to receive the fourth downstream optical signal and transmit the fourth downstream optical signal to the second filter; the second filter is used to filter the fourth downstream optical signal to obtain an optical signal of a downstream wavelength corresponding to the access side optical module. That is, the optical splitter of the intermediate device in the first implementation is sunk into the access side optical module.

[0027] Among them, the intermediate device also includes a second splitter, which is connected to multiple ports through optical fibers respectively, and the second splitter is also connected to the central optical module through optical fibers; the second splitter is used to divide the second downstream optical signal into multiple third downstream optical signals by energy splitting, and transmit the third downstream optical signal to multiple ports.

[0028] In this implementation, each access side optical module also corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths. The access side optical module also includes a second laser, and the second laser is connected to the third beam splitter through an optical fiber;

[0029] The second laser is used to generate an optical signal of an upstream wavelength corresponding to the access side optical module, and transmit the optical signal of the upstream wavelength to the third optical splitter;

[0030] The third optical splitter is also used to transmit an optical signal of an upstream wavelength to the connected port;

[0031] The second optical splitter is further used to couple the optical signals of multiple upstream wavelengths transmitted by multiple ports into a first upstream optical signal by energy combination, and transmit the first upstream optical signal to the central optical module.

[0032] Optionally, the access side optical module is inserted into the access device, or the access side optical module is integrated into the access device, and the access device is used to access the optical communication system through the access side optical module;

[0033] The central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to communicate with the access device through the central optical module.

[0034] In a second aspect, an optical communication method is provided, which is applied to a first optical module among a plurality of access side optical modules included in an optical communication system, wherein the optical communication system further includes an intermediate device, wherein the intermediate device includes a plurality of ports, wherein each access side optical module among the plurality of access side optical modules is connected to any one of the plurality of ports through an optical fiber, and different access side optical modules are connected to different ports, wherein the first optical module is connected to a first port among the plurality of ports through an optical fiber, wherein each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths, wherein the first optical module corresponds to a first downlink wavelength; the method includes:

[0035] Receiving a downlink optical signal transmitted by the first port, the downlink optical signal having a plurality of downlink wavelengths, the plurality of downlink wavelengths including at least one downlink wavelength corresponding to an access-side optical module;

[0036] An optical signal of a first downstream wavelength is obtained from the downstream optical signal.

[0037] Optionally, the first optical module includes a first filter;

[0038] Acquiring an optical signal of a first downstream wavelength from the downstream optical signal includes:

[0039] The first filter filters the downstream optical signal to obtain an optical signal of a first downstream wavelength.

[0040] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths, wherein the first optical module further corresponds to the first uplink wavelength; the method further includes:

[0041] generating an optical signal of a first upstream wavelength;

[0042] An optical signal of a first upstream wavelength is transmitted to the first port.

[0043] Optionally, the first optical module further includes a first laser, and the first laser is connected to the first port via an optical fiber;

[0044] Generating an optical signal of a first upstream wavelength, comprising:

[0045] The first laser generates an optical signal of a first upstream wavelength.

[0046] Optionally, the first optical module includes a first beam splitter and a second filter, and the first beam splitter is connected to the first port and the second filter respectively through optical fibers;

[0047] Receiving a downlink optical signal transmitted by the first port, comprising:

[0048] The first optical splitter receives the downlink optical signal transmitted by the first port;

[0049] Acquiring an optical signal of a first downstream wavelength from a downstream optical signal includes:

[0050] The first beam splitter transmits the downlink optical signal to the second filter;

[0051] The second filter demultiplexes the downlink optical signal to obtain an optical signal of a first downlink wavelength.

[0052] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths, wherein the first optical module further corresponds to the first uplink wavelength, the first optical module further includes a second laser, and the second laser is connected to the first beam splitter; the method further includes:

[0053] The second laser generates an optical signal of a first upstream wavelength and transmits the optical signal of the first upstream wavelength to the first beam splitter;

[0054] The first beam splitter transmits an optical signal of a first upstream wavelength to the first port.

[0055] Optionally, the first optical module is inserted into an access device, or the first optical module is integrated into the access device, and the access device is used to access the optical communication system through the first optical module.

[0056] In a third aspect, an optical communication method is provided, which is applied to an intermediate device in an optical communication system, wherein the optical communication system further includes a central optical module and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the intermediate device includes multiple ports, each of the multiple access side optical modules is connected to any one of the multiple ports through an optical fiber, different access side optical modules are connected to different ports, and each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths; the method includes:

[0057] receiving a first downstream optical signal transmitted by a central optical module to obtain a second downstream optical signal, wherein the first downstream optical signal has a plurality of downstream wavelengths, the plurality of downstream wavelengths including at least one downstream wavelength corresponding to an access-side optical module, and the second downstream optical signal is an optical signal obtained by transmitting the first downstream optical signal through an optical fiber between the central optical module and an intermediate device;

[0058] dividing the second downstream optical signal into a plurality of third downstream optical signals, each of the plurality of third downstream optical signals having a plurality of downstream wavelengths;

[0059] A third downstream optical signal is transmitted to the access side optical module connected to the current port through each of the multiple ports, and the third downstream optical signal is used for each access side optical module in the multiple access side optical modules to obtain an optical signal of a downstream wavelength corresponding to the current access side optical module.

[0060] Optionally, the intermediate device further includes a first optical splitter, and the first optical splitter is connected to the multiple ports respectively through optical fibers;

[0061] The second downlink optical signal is divided into a plurality of third downlink optical signals, comprising:

[0062] The first optical splitter divides the second downstream optical signal into a plurality of third downstream optical signals by energy splitting.

[0063] Optionally, the intermediate device further includes a first beam splitter, the central optical module includes a second beam splitter, and the first beam splitter is connected to the second beam splitter and the first beam splitter respectively through optical fibers;

[0064] Receiving a first downlink optical signal transmitted by a central optical module to obtain a second downlink optical signal includes:

[0065] The first beam splitter receives the first downstream optical signal transmitted by the second beam splitter to obtain a second downstream optical signal.

[0066] Optionally, the central optical module includes a first combiner, and the first combiner is connected to the first optical splitter through an optical fiber;

[0067] Receiving a first downlink optical signal transmitted by a central optical module to obtain a second downlink optical signal includes:

[0068] The first optical splitter receives the first downstream optical signal transmitted by the first combiner to obtain a second downstream optical signal.

[0069] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths; the method further includes:

[0070] Receiving optical signals of multiple upstream wavelengths through the multiple ports, the multiple upstream wavelengths including at least one upstream wavelength corresponding to an access-side optical module;

[0071] Combining the optical signals of the multiple upstream wavelengths into a first upstream optical signal;

[0072] Transmit a first uplink optical signal to the central optical module.

[0073] Optionally, the intermediate device further includes a first optical coupler, and the first optical coupler is connected to the plurality of ports respectively via optical fibers;

[0074] Combining the optical signals of the multiple upstream wavelengths into a first upstream optical signal, comprising:

[0075] The first optical coupler combines the optical signals of the multiple upstream wavelengths into a first upstream optical signal by energy combination.

[0076] Optionally, the intermediate device further includes a first beam splitter, the central optical module further includes a second beam splitter, and the first beam splitter is connected to the second beam splitter and the first optical coupler respectively through optical fibers;

[0077] Transmitting a first uplink optical signal to a central optical module includes:

[0078] The first optical coupler transmits a first uplink optical signal to the first optical splitter;

[0079] The first beam splitter transmits a first uplink optical signal to the second beam splitter.

[0080] Optionally, the first optical splitter is also connected to the central optical module via an optical fiber;

[0081] Receiving a first downlink optical signal transmitted by a central optical module to obtain a second downlink optical signal includes:

[0082] The first optical splitter receives the first downstream optical signal transmitted by the central optical module to obtain a second downstream optical signal.

[0083] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths; the method further includes:

[0084] The first optical splitter obtains optical signals of multiple upstream wavelengths transmitted by the multiple ports, where the multiple upstream wavelengths include at least one upstream wavelength corresponding to an access-side optical module;

[0085] The first optical splitter couples the optical signals of multiple upstream wavelengths transmitted by the multiple ports into a first upstream optical signal by energy combination, and transmits the first upstream optical signal to the central optical module.

[0086] In a fourth aspect, an optical communication method is provided, which is applied to a central optical module in an optical communication system, wherein the optical communication system further includes an intermediate device and a plurality of access side optical modules, wherein the central optical module is connected to the intermediate device via an optical fiber, wherein the intermediate device includes a plurality of ports, wherein each of the plurality of access side optical modules is connected to any one of the plurality of ports via an optical fiber, wherein different access side optical modules are connected to different ports, and each access side optical module corresponds to a downlink wavelength, wherein different access side optical modules correspond to different downlink wavelengths; the method includes:

[0087] Generate optical signals of multiple downstream wavelengths, the multiple downstream wavelengths including at least one downstream wavelength corresponding to an access-side optical module;

[0088] Combining the optical signals of the multiple downstream wavelengths into a first downstream optical signal, where the first downstream optical signal has the multiple downstream wavelengths;

[0089] A first downstream optical signal is transmitted to an intermediate device, and the first downstream optical signal is used by the intermediate device to divide the received second downstream optical signal into multiple third downstream optical signals, and transmit a third downstream optical signal to the access side optical module connected to the port through each port of the multiple ports, so that the access side optical module obtains the optical signal of the downstream wavelength corresponding to the access side optical module from the received fourth downstream optical signal. The second downstream optical signal is an optical signal after the first downstream optical signal is transmitted via the optical fiber between the central optical module and the intermediate device, and the fourth downstream optical signal is an optical signal after the third downstream optical signal is transmitted via the optical fiber between the access side optical module and the port.

[0090] The central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to access the optical communication system through the central optical module.

[0091] In a fifth aspect, a communication device is provided, which has the function of implementing the optical communication method described in the second aspect, the third aspect, or the fourth aspect. The communication device includes one or more modules, which are used to implement the optical communication method described in the second aspect, the third aspect, or the fourth aspect.

[0092] In a sixth aspect, an optical communication system is provided, the optical communication system includes a routing switching device, the routing switching device is inserted with a central optical module or integrated with a central optical module, the optical communication system also includes an intermediate device and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the routing switching device also includes a transceiver matching module, the central optical module includes a first splitter and multiple optoelectronic conversion submodules, the first splitter is connected to the multiple optoelectronic conversion submodules respectively through optical fibers, each optoelectronic conversion submodule corresponds to an upstream wavelength and a downstream wavelength with a matching relationship, different optoelectronic conversion submodules correspond to different upstream wavelengths and corresponding downstream wavelengths are also different, the intermediate device includes a first optical coupler and multiple ports, the first optical coupler is connected to the multiple ports respectively through optical fibers, each of the multiple access side optical modules is connected to any one of the multiple ports through optical fibers, different access side optical modules are connected to different ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, each access side optical module corresponds to an upstream wavelength, and different access side optical modules correspond to different upstream wavelengths;

[0093] Each of the multiple optoelectronic conversion submodules is used to obtain a first downstream electrical signal transmitted by the routing switching device, convert the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmit the optical signal of the downstream wavelength to the intermediate device;

[0094] The intermediate device is used to obtain optical signals of multiple downstream wavelengths, and transmit the optical signal of the downstream wavelength corresponding to the port to the access side optical module connected to the port through each port of the multiple ports, wherein the multiple downstream wavelengths include the downstream wavelength corresponding to at least one port;

[0095] The first optical module among the multiple access side optical modules is used to receive an optical signal of a first downstream wavelength transmitted by a first port to which the first optical module is connected, and is also used to transmit an optical signal of a first upstream wavelength to the first port, the first downstream wavelength does not match the first upstream wavelength, and the first optical module is any one of the multiple access side optical modules;

[0096] The intermediate device is also used to receive optical signals of multiple upstream wavelengths through the multiple ports, couple the optical signals of the multiple upstream wavelengths into a first upstream optical signal through a first optical coupler, and transmit the first upstream optical signal to the central optical module, wherein the multiple upstream wavelengths include at least one upstream wavelength corresponding to the access side optical module;

[0097] The first demultiplexer is used to obtain the first uplink optical signal, decompose the first uplink optical signal into the optical signals of the multiple uplink wavelengths, and transmit the optical signals of the uplink wavelengths corresponding to each access-side optical module to the multiple optoelectronic conversion submodules respectively;

[0098] Each optoelectronic conversion submodule is also used to convert an optical signal of an uplink wavelength corresponding to the optoelectronic conversion submodule into a first uplink electrical signal, and transmit the first uplink electrical signal to the transceiver matching module;

[0099] The transceiver matching module is used to match multiple first downlink electrical signals transmitted by multiple optoelectronic conversion submodules with multiple first uplink electrical signals to determine the uplink wavelength optical signal sent and the downlink wavelength optical signal received by the same access side optical module.

[0100] It can be seen that even if multiple access side optical modules are mixed, the uplink wavelength of the optical signal transmitted by each access side optical module to the intermediate device may not match the downlink wavelength of the received optical signal, but the intermediate device can still couple the optical signals of multiple uplink wavelengths received by multiple ports through the optical coupler and transmit them to the central optical module. Although this may cause the optical signal sent and the received optical signal of one or some optoelectronic conversion sub-modules of the central optical module to be not about the optical signal of the same access side optical module, that is, there is a mismatch between the transmission and reception of multiple optoelectronic conversion sub-modules, the routing switching device can use the transceiver matching module to determine the optical signals sent and received by the same access side optical module, that is, perform transceiver matching, thereby ensuring the reliability of optical communication.

[0101] The central optical module further includes a first combiner, and the intermediate device further includes a second splitter. The first combiner is connected to the plurality of optoelectronic conversion submodules through optical fibers, and the second splitter is connected to the plurality of ports through optical fibers.

[0102] The first combiner is used for combining the optical signals of the multiple downstream wavelengths into a first downstream optical signal, and transmitting the first downstream optical signal to the second splitter;

[0103] The second splitter is used to receive the second downstream optical signal, decompose the first downstream optical signal into multiple downstream wavelength optical signals, and transmit the downstream wavelength optical signal corresponding to each port to multiple ports respectively. The second downstream optical signal is the optical signal after the first downstream optical signal is transmitted through the optical fiber between the central optical module and the intermediate device.

[0104] Optionally, the intermediate device further includes a first beam splitter, the central optical module further includes a second beam splitter, the first beam splitter is connected to the second wave splitter, the first optical coupler and the second beam splitter respectively through optical fibers, and the second beam splitter is further connected to the first wave combiner and the first wave splitter respectively through optical fibers;

[0105] The first optical splitter is used to receive the first uplink optical signal transmitted by the first optical coupler, transmit the first uplink optical signal to the second optical splitter, and receive the first downlink optical signal transmitted by the second optical splitter to obtain the second uplink optical signal, and transmit the second downlink optical signal to the second splitter;

[0106] The second beam splitter is used to obtain the first downstream optical signal transmitted by the first combiner, transmit the first downstream optical signal to the first beam splitter, and obtain the first upstream optical signal transmitted by the first beam splitter to obtain the second upstream optical signal and transmit the second upstream optical signal to the first beam splitter.

[0107] In this way, communication between the intermediate device and the central optical module can be achieved through a single optical cable connection, that is, communication is achieved through a single fiber.

[0108] Alternatively, the first combiner is connected to the second splitter, and the first optical coupler is connected to the first splitter; the first combiner is used to transmit the first downlink optical signal to the second splitter; the first optical coupler is used to transmit the first uplink optical signal to the first splitter. In this way, the intermediate device and the central optical module can communicate by connecting two optical cables, that is, communicating by dual fibers.

[0109] The access side optical module is inserted into the access device, or the access side optical module is integrated into the access device, and the access device is used to access the optical communication system through the access side optical module.

[0110] In a seventh aspect, an optical communication method is provided, characterized in that it is applied to a first optical module among a plurality of access side optical modules included in an optical communication system, the optical communication system further includes an intermediate device and a routing switching device, the routing switching device is connected to the intermediate device through an optical fiber, the intermediate device includes a plurality of ports, the first optical module is connected to a first port among the plurality of ports through an optical fiber, the first port is any one of the plurality of ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, the first port corresponds to a first downstream wavelength, the downstream wavelength is also matched with an upstream wavelength, different downstream wavelengths match different upstream wavelengths, the first optical module corresponds to a first upstream wavelength, and the first upstream wavelength does not match the first downstream wavelength; the method includes:

[0111] receiving an optical signal of a first downstream wavelength transmitted by a first port;

[0112] The first upstream wavelength optical signal is transmitted to the first port, so as to transmit the first upstream wavelength optical signal to the routing switching device through the intermediate device, and the routing switching device is used to match the downstream wavelength optical signal received by the same access side optical module with the upstream wavelength optical signal sent.

[0113] In an eighth aspect, an optical communication method is provided, which is applied to an intermediate device in an optical communication system, wherein the optical communication system further includes a routing switching device and a plurality of access side optical modules, the routing switching device is connected to the intermediate device through an optical fiber, the intermediate device includes a first optical coupler and a plurality of ports, the first optical coupler is connected to the plurality of ports respectively through optical fibers, each access side optical module is connected to any one port through an optical fiber, different access side optical modules are connected to different ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, each downstream wavelength is also matched with an upstream wavelength, different downstream wavelengths match different upstream wavelengths, each access side optical module corresponds to an upstream wavelength, and different access side optical modules correspond to different upstream wavelengths; the method includes:

[0114] Acquire optical signals of multiple downstream wavelengths transmitted by a routing switching device, wherein the multiple downstream wavelengths include a downstream wavelength corresponding to at least one port;

[0115] Transmitting an optical signal of a downstream wavelength corresponding to the port to an access side optical module connected to the port through each of the multiple ports, and receiving an optical signal of an upstream wavelength transmitted by the access side optical module through the multiple ports, wherein the downstream wavelength of the optical signal sent by the same port among the multiple ports does not match the upstream wavelength of the optical signal received;

[0116] coupling the optical signals of the multiple upstream wavelengths received through the multiple ports into a first upstream optical signal through a first optical coupler;

[0117] The first uplink optical signal is transmitted to the routing switching device, and the routing switching device is used to determine the uplink wavelength optical signal sent and the downlink wavelength optical signal received by the same access side optical module by matching multiple uplink wavelength optical signals with multiple downlink wavelength optical signals.

[0118] In a ninth aspect, an optical communication method is provided, which is applied to a routing switching device in an optical communication system, wherein the routing switching device is inserted with a central optical module or integrated with a central optical module, the optical communication system further includes an intermediate device and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the routing switching device further includes a transceiver matching module, the central optical module includes a first splitter and multiple optoelectronic conversion submodules, the first splitter is connected to the multiple optoelectronic conversion submodules through optical fibers, each optoelectronic conversion submodule corresponds to an upstream wavelength and a downstream wavelength having a matching relationship, different optoelectronic conversion submodules correspond to different upstream wavelengths and corresponding downstream wavelengths are also different, the intermediate device includes multiple ports, each of the multiple access side optical modules is connected to any one of the multiple ports through an optical fiber, different access side optical modules are connected to different ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, each access side optical module corresponds to an upstream wavelength, and different access side optical modules correspond to different upstream wavelengths; the method includes:

[0119] Each of the multiple optoelectronic conversion submodules obtains a first downstream electrical signal transmitted by the routing switching device, converts the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmits the optical signal of the downstream wavelength to the intermediate device;

[0120] Each optoelectronic conversion submodule receives an optical signal of an upstream wavelength corresponding to the optoelectronic conversion submodule transmitted by an intermediate device, converts the optical signal of the upstream wavelength corresponding to the optoelectronic conversion submodule into a first upstream electrical signal, and transmits the first upstream electrical signal to the transceiver matching module;

[0121] The transceiver matching module matches multiple first downlink electrical signals transmitted by multiple optoelectronic conversion submodules with multiple first uplink electrical signals to determine the optical signal of the uplink wavelength sent and the optical signal of the downlink wavelength received by the same access side optical module.

[0122] In a tenth aspect, a communication device is provided, wherein the communication device has the function of implementing the optical communication method described in the seventh aspect, the eighth aspect, or the ninth aspect. The communication device includes one or more modules, and the one or more modules are used to implement the optical communication method described in the seventh aspect, the eighth aspect, or the ninth aspect.

[0123] In the eleventh aspect, a communication device is provided, the communication device comprising a processor and a memory, the memory being used to store a program for executing the optical communication method provided in the second aspect, the third aspect, the fourth aspect, the seventh aspect, the eighth aspect, or the ninth aspect, and storing data involved in implementing the optical communication method provided in the second aspect, the third aspect, the fourth aspect, the seventh aspect, the eighth aspect, or the ninth aspect. The processor is configured to execute the program stored in the memory. The communication device may also include a communication bus, which is used to establish a connection between the processor and the memory.

[0124] In the twelfth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the optical communication method described in the second aspect, the third aspect, the fourth aspect, the seventh aspect, the eighth aspect, or the ninth aspect.

[0125] In the thirteenth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the optical communication method described in the second aspect, the third aspect, the fourth aspect, the seventh aspect, the eighth aspect, or the ninth aspect.

[0126] The technical effects obtained by the second to fourth aspects are similar to those obtained by the corresponding technical means in the first aspect, and are not described in detail here. The technical effects obtained by the sixth to thirteenth aspects are similar to those obtained by the corresponding technical means in the fifth aspect, and are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0127] Figure 1 is an architecture diagram of an optical communication system provided in an embodiment of the present application;

[0128] Figure 2 is an architecture diagram of another optical communication system provided in an embodiment of the present application;

[0129] Figure 3 is an architecture diagram of another optical communication system provided in an embodiment of the present application;

[0130] Figure 4 is an architecture diagram of another optical communication system provided in an embodiment of the present application;

[0131] Figure 5 is an architecture diagram of another optical communication system provided in an embodiment of the present application;

[0132] Figure 6 is an architecture diagram of another optical communication system provided in an embodiment of the present application;

[0133] Figure 7is a flow chart of an optical communication method provided by an embodiment of the present application;

[0134] Figure 8 is a flow chart of another optical communication method provided by an embodiment of the present application;

[0135] Fig. 9 is a flow chart of another optical communication method provided in an embodiment of the present application;

[0136] Fig.10 It is a structural diagram of a communication device provided in an embodiment of the present application;

[0137] Fig.11 is a structural diagram of another communication device provided in an embodiment of the present application;

[0138] Fig.12 It is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0139] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0140] To facilitate understanding, some terms involved in the embodiments of the present application are first introduced.

[0141] Wavelength division multiplexing: abbreviated as WDM, usually uses multiple wavelengths to achieve multitasking. WDM is a data transmission technology. In an optical communication system, different optical signals are carried by different colors (i.e. wavelengths or frequencies), and multiple optical signals of different wavelengths are multiplexed and transmitted on one optical fiber. The optical communication system and method provided in the embodiment of the present application are applied to the WDM system, which solves the problem that the access side optical modules in the WDM system of the related art cannot be mixed.

[0142] Point to multi-point (P2MP): A transmission mode that transmits data from one source to one or more receivers.

[0143] Passive optical network (PON): As an emerging broadband access fiber technology covering the last mile, it does not require node equipment at the optical branching point, and only needs to install a simple optical splitter. Therefore, it has the advantages of saving optical cable resources, sharing bandwidth resources, saving equipment room investment, high equipment security, fast network construction speed, and low comprehensive network construction cost. The intermediate device in the embodiment of the present application is a passive device that can be used in a passive optical network.

[0144] Next, the background knowledge of the embodiments of the present application is introduced.

[0145] The embodiment of this application is designed for the evolution of campus network architecture, but is not limited to campus network. The demand of this solution is triggered by the evolution of campus network to all-optical campus, so the embodiment of this application will be elaborated according to the evolution of campus architecture and the route of this solution.

[0146] First, let’s introduce the architecture of traditional campus networks, what drives the evolution of campus network architecture, and the direction of evolution.

[0147] In traditional campus networks, the networking structure is mainly tree-type networking, and the most typical tree-type architecture is three-layer networking. The three layers are the access layer, the aggregation layer, and the core layer. In the traditional structure, the access layer directly pulls the network cable to the network-using devices (also known as user devices, such as personal computers (PCs) / WIFI devices, etc.), and the aggregation layer will complete the north-south data aggregation and the east-west data exchange. Among them, the access layer is mainly interconnected downward (that is, to the network-using devices) through network cables. The access layer to the aggregation layer and the aggregation layer to the core layer are usually interconnected through optical fibers. The connection between each layer is point-to-point (P2P) mode. There is no convergence in either optical fiber or network cable. Data convergence and exchange are only achieved at the switch.

[0148] The specific location of the three-layer structure varies slightly in different types of parks.

[0149] In large campuses, network construction is usually carried out in units of buildings. A core exchange area (i.e., core layer) is set up for the entire campus. Each building can be built in a two-layer tree structure, that is, each building serves as an independent convergence point. When a large campus adopts this tree structure, data exchange within the same building can be completed within the building, and data exchange between different buildings can be completed through the core layer.

[0150] Medium-sized parks usually adopt a two-layer structure. Depending on the network scale and business needs, a three-layer structure can also be used. When there are many network access points and multiple aggregation points need to be set up, a three-layer structure can be used. For example, in a newly built office building, a weak current room on each floor can be used as a aggregation point. The entire building adopts a three-layer structure and sets a core layer. When there are different business isolation requirements, such as isolation between departments, and a separate aggregation point needs to be set for each type of business or department, a three-layer structure can be used.

[0151] The above briefly introduces the traditional three-layer architecture of the campus network. Next, we will introduce the next-generation campus architecture (i.e., the all-optical campus architecture). At present, the exploration of all-optical campuses in related fields is mainly divided into two systems. One is the passive optical LAN (POL) solution system based on PON technology, and the other is the all-optical Ethernet solution based on the traditional Ethernet solution. Both systems have their own advantages and disadvantages. This solution mainly integrates these two systems to achieve the deep integration of Internet protocol (IP) and light.

[0152] Among them, POL is a local area network based on PON technology, which provides users with integrated data, voice, video and other weak current services through optical fiber. POL is a solution that directly applies access network PON technology to the park. Taking the traditional three-layer network of the park as an example to illustrate the application of POL in the park network, POL replaces the access and aggregation layers, puts the optical line terminal (OLT) equipment together with the core layer switch, and uses passive splitters and optical fibers in the middle to complete the P2MP connection. Compared with traditional solutions, POL can simplify the network architecture and realize the transformation of a three-layer network into a two-layer network. At the same time, since the optical network units (ONUs) of the OLT equipment and the user equipment are placed at both ends of the network, the intermediate link can be fully passive, reducing the number of equipment maintenance and the power consumption of the equipment. In addition, the design of P2MP can greatly save the use of optical fibers and reduce the equipment deployment space.

[0153] The application of PON technology in all-optical campuses has also triggered the evolution of traditional Ethernet in the direction of all-optical. The main problems encountered by traditional campus network solutions include: no optical fiber directly pulled to the room, multiple network layers, a large number of optical fibers / network cables, and active devices in the interconnection links. In response to the above problems, the exploration of Ethernet all-optical campuses has been carried out.

[0154] In the scenario of fiber-to-the-home, the switch on the user side is miniaturized and its functions are weakened to obtain a box-type access switch. For example, a 24-port box-type access switch can be placed directly on the user's desktop to form a 4-port or 8-port desktop switch, thus realizing direct pulling of optical fiber.

[0155] As can be seen from the foregoing, the embodiments of the present application are mainly used in wavelength division systems, and in the current wavelength division scheme, the access side optical module needs to be aligned with the port of the combiner / splitter, that is, the access side optical module and the port of the combiner / splitter cannot be mixed. For example, the optical fiber connected to the access side optical module 1 needs to be plugged into port 1 of the combiner / splitter, and cannot be plugged into other ports. The access device is usually located in the user's room, and the combiner / splitter may be located in the central computer room of the building, which is far away. It may take multiple attempts to pair the optical fibers connected to multiple access side optical modules, which is very time-consuming and labor-intensive. In addition, these multiple access side optical modules require multiple different codes to correspond to different upstream and downstream wavelengths through different codes.

[0156] The embodiments of the present application can realize the mixed insertion or normalization of color light scattered optical modules (i.e., access side optical modules) of the wavelength division system, thereby improving the networking flexibility of optical communications and reducing the difficulty of equipment management and maintenance.

[0157] Next, the implementation environment involved in the embodiments of the present application is introduced.

[0158] Figure 1 is an architecture diagram of an optical communication system provided in an embodiment of the present application. Figure 1 The system includes a central optical module, an intermediate device and multiple access side optical modules. The central optical module is connected to the intermediate device via an optical fiber. The intermediate device includes multiple ports. Each access side optical module is connected to any port of the intermediate device via an optical fiber. Different access side optical modules are connected to different ports.

[0159] The multiple access side optical modules can be mixed into the multiple ports without having to care about the correspondence between the ports, the access side optical modules and the upstream and downstream wavelengths. That is, each access side optical module can be connected to any port.

[0160] In the embodiment of the present application, the access side optical module is inserted into the access device, or the access side optical module is integrated into the access device, and the access device is used to access the above optical communication system through the access side optical module. Similarly, the central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to communicate with the access device through the central optical module.

[0161] Access devices can be asteroids, access points (APs) or other devices in the industry. Access devices can also be called optical access devices or optical line terminals or other names. Routing and switching devices can be switches (such as local area network switches (LSWs)) or routers. Routing and switching devices can also be called central switches, core switches or other names. Central optical modules can also be called core-side optical modules or local-end optical modules. Access-side optical modules can also be called terminal optical modules.

[0162] The central optical module, the intermediate device and the multiple access side optical modules are used to perform optical communication according to the optical communication method provided in the embodiment of the present application, that is, to transmit uplink and downlink information through optical signals. In order to realize the hybrid insertion of optical modules, the embodiment of the present application provides a variety of specific implementation methods. Figures 2 to 6 These various specific implementation methods are introduced.

[0163] Figure 2 and Figure 3 This is an architecture diagram of two optical communication systems provided in the embodiments of the present application. Figure 2 and Figure 3 The specific process of transmitting downlink information and transmitting uplink information in the first specific implementation manner is introduced.

[0164] First, the specific process of transmitting downlink information is introduced.

[0165] In the wavelength division system, downlink information is transmitted through optical signals of downlink wavelengths. Each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths. For example, if the system includes 8 access side optical modules, then these 8 access side optical modules correspond to 8 different downlink wavelengths one by one.

[0166] During the transmission of downlink information, the central optical module is used to transmit a first downlink optical signal to the intermediate device. The first downlink optical signal has multiple downlink wavelengths, and the multiple downlink wavelengths include a downlink wavelength corresponding to at least one access side optical module. The first downlink optical signal carries downlink information transmitted to at least one access device. The intermediate device is used to receive the second downlink optical signal, divide the second downlink optical signal into multiple third downlink optical signals, and transmit a third downlink optical signal to the access side optical module connected to the port through each of the multiple ports. Each of the multiple third downlink optical signals has multiple downlink wavelengths and also carries downlink information transmitted to the at least one access device. Each of the multiple access side optical modules is used to obtain an optical signal of the downlink wavelength corresponding to the access side optical module from the received fourth downlink optical signal. The multiple access devices are the access devices to which the multiple access side optical modules belong. The second downlink optical signal is an optical signal after the first downlink optical signal is transmitted through the optical fiber between the central optical module and the intermediate device. The fourth downlink optical signal is an optical signal after the third downlink optical signal is transmitted through the optical fiber between the access side optical module and the port.

[0167] It should be understood that, considering the loss of optical signals during transmission in optical fibers over longer distances, the optical signals sent by the central optical module are not completely the same as the optical signals received by the intermediate devices, and the optical signals sent by the intermediate devices are not completely the same as the optical signals received by the access side optical modules. Based on this, in the embodiments of the present application, the transmitted optical signals and the received optical signals are distinguished by words such as "first", "second", "third", and "fourth". Simply put, the first downstream optical signal becomes the second downstream optical signal due to loss after being transmitted through the optical fiber, and the third downstream optical signal becomes the fourth downstream optical signal due to damage after being transmitted through the optical fiber.

[0168] The first downstream optical signal and the second downstream optical signal are both a composite optical signal (such as a color optical signal). The intermediate device divides the received composite optical signal into multiple composite optical signals, thereby transmitting a composite optical signal with multiple downstream wavelengths to multiple access side optical modules. In this way, even if the multiple access side optical modules are mixed, they can all obtain the corresponding downstream wavelength optical signal from the received composite optical signal, and then the multiple access devices can all obtain the corresponding downstream information from the corresponding downstream wavelength optical signal, thereby ensuring communication reliability.

[0169] The at least one access side optical module includes the access side optical module currently in communication. For example, when all access side optical modules in the optical communication system are currently in communication, the at least one access side optical module includes all access side optical modules in the optical communication system. The at least one port in the following text is similar.

[0170] Among them, the central optical module includes a first combiner, and the intermediate device also includes a first splitter, and the first splitter is connected to the above-mentioned multiple ports respectively through optical fibers; the first combiner is used to obtain the above-mentioned multiple downstream wavelength optical signals, combine the above-mentioned multiple downstream wavelength optical signals into a first downstream optical signal, and transmit the first downstream optical signal to the first splitter; the first splitter is used to receive the second downstream optical signal, and divide the second downstream optical signal into the above-mentioned multiple third downstream optical signals by energy splitting, and transmit one third downstream optical signal to each of the multiple ports.

[0171] That is, the first combiner can combine multiple input signals with different wavelengths into one signal. In the embodiment of the present application, the first combiner has multiple input ends and one output end, and the multiple input ends correspond to the multiple downstream wavelengths one by one, each input end is used to receive an optical signal of the downstream wavelength corresponding to the input end, and the output end is used to output the combined first downstream optical signal.

[0172] See also Figure 2 and Figure 3 The first combiner may be implemented by a multiplexer (MUX) or by other devices with similar functions, which is not limited in the embodiments of the present application.

[0173] The first optical splitter can split a signal into multiple signals by energy splitting. For example, the first optical splitter has an input end and multiple output ends, the multiple output ends are connected to the multiple ports one by one, the input end is used to receive the second downstream optical signal, and the multiple output ends are used to output a third downstream optical signal respectively.

[0174] Optionally, the first optical splitter divides the second downstream optical signal into a plurality of third downstream optical signals in an energy-equalizing manner, and the energies of the plurality of third downstream optical signals are the same. Alternatively, the first optical splitter may not evenly divide the energy, but distribute the energy of the second downstream optical signal in other proportions, that is, the energies of the plurality of third downstream optical signals obtained may be different, and the embodiments of the present application do not limit this. Wherein, in the case where the intermediate device is a passive device, the sum of the energies of the plurality of third downstream optical signals does not exceed the energy of the second downstream optical signal. In the case where the intermediate device is an active device, the sum of the energies of the plurality of third downstream optical signals may exceed the energy of the second downstream optical signal. For example, the intermediate device also includes an energy amplifier, which utilizes the energy amplifier to make the sum of the energies of the plurality of third downstream optical signals exceed the energy of the second downstream optical signal, thereby improving the quality of the third downstream optical signal.

[0175] The first optical splitter may be implemented by an optical splitter, or by other devices with similar functions, which is not limited in the embodiments of the present application.

[0176] Optionally, the central optical module further includes a plurality of photoelectric conversion submodules, the first combiner is connected to the plurality of photoelectric conversion submodules respectively through optical fibers, the photoelectric conversion submodules correspond to an uplink wavelength and a downlink wavelength having a matching relationship, and different photoelectric conversion submodules correspond to different uplink wavelengths and different downlink wavelengths. Each photoelectric conversion submodule is used to obtain a routing switching device (such as Figure 2 and Figure 3 The first downstream electrical signal is transmitted by the optical fiber converter (LSW) as shown in the figure, converts the first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmits the optical signal of the downstream wavelength corresponding to the optoelectronic conversion submodule to the first combiner. The first combiner is used to obtain the optical signals of multiple downstream wavelengths transmitted by the multiple optoelectronic conversion submodules. The first downstream electrical signal carries the downstream information.

[0177] Each of the plurality of photoelectric conversion submodules includes a photodiode (PD) and a laser diode (LD). Figure 2 and Figure 3 , taking the central optical module including three photoelectric conversion submodules as an example, the first photoelectric conversion submodule includes LD1 and PD1, the second photoelectric conversion submodule includes LD2 and PD2, and the third photoelectric conversion submodule includes LD3 and PD3. In other embodiments, the photoelectric conversion submodule can also be represented by O / E (E / O), where 'O' represents the abbreviation of optical and 'E' represents the abbreviation of electricity. Each photoelectric conversion submodule is used to perform photoelectric conversion on the received optical signal.

[0178] It should be understood that the drawing of LD1, LD2 and LD3 in a frame does not mean that the physical positions of LD1, LD2 and LD3 must be together. Similarly, the drawing of PD1, PD2 and PD3 in a frame does not mean that the physical positions of PD1, PD2 and PD3 must be together. The physical positions of these devices can be set according to actual conditions, and the embodiments of the present application are not limited to this. For example, LD1 and PD1 can be set together, LD2 and PD2 can be set together, and LD3 and PD3 can be set together. The same is true for similar places in the subsequent embodiment figures, which will not be repeated in the following text.

[0179] Alternatively, see Figure 2The intermediate device also includes a splitter, which is called the first splitter, and the central optical module also includes a splitter, which is called the second splitter. The first splitter is connected to the second splitter and the first splitter through optical fibers respectively, and the second splitter is also connected to the first combiner through optical fibers; the first combiner is also used to transmit the first downstream optical signal to the second splitter; the second splitter is used to transmit the first downstream optical signal to the first splitter; the first splitter is used to receive the second downstream optical signal and transmit the second downstream optical signal to the first splitter.

[0180] It should be understood that, for the sake of ease of understanding and simplicity, since the loss of optical signals transmitted in the same device is very small and almost negligible, the naming of optical signals in the same device is simplified in the embodiments of the present application. In the absence of misunderstanding, the optical signals sent and received between different modules in the same device are named as the same optical signal. For example, the optical signal sent by the first optical splitter to the first optical splitter and the optical signal received by the first optical splitter are both called the second downstream optical signal. In fact, due to the loss in optical fiber transmission, there may be certain differences between the optical signal sent by the module and the optical signal received by the opposite module. For example, there may be certain differences between the second downstream optical signal sent by the first optical splitter to the first optical splitter and the second downstream optical signal received by the first optical splitter.

[0181] Alternatively, see Figure 3 The first combiner of the central optical module is directly connected to the first optical splitter of the intermediate device through an optical fiber; the first combiner is also used to transmit the first downlink optical signal to the first optical splitter.

[0182] See also Figure 2 and Figure 3 The access side optical module includes a first filter, which is used to filter the received fourth downlink optical signal to obtain an optical signal of a downlink wavelength corresponding to the access side optical module. That is, each access side optical module filters a received composite optical signal with multiple downlink wavelengths through a filter to obtain an optical signal of a downlink wavelength corresponding to the access side optical module.

[0183] See also Figure 2 and Figure 3 The access side optical module also includes a PD, which is connected to the first filter through an optical fiber. The first filter is also used to transmit an optical signal of a downlink wavelength corresponding to the access side optical module to the PD. The PD is used to perform photoelectric conversion on the received optical signal of the downlink wavelength to obtain a second downlink electrical signal, and transmit the second downlink electrical signal to other modules of the access device, so that other modules of the access device can obtain corresponding downlink information from the second downlink electrical signal, or transmit the second downlink electrical signal to a user terminal connected to the access device.

[0184] Alternatively, the access side optical module includes a second wave splitter, which is used to split the third downlink optical signal transmitted by the port to obtain optical signals of multiple downlink wavelengths, and determine the optical signal of the downlink wavelength corresponding to the access side optical module from the optical signals of multiple downlink wavelengths. That is, the above-mentioned first filter can be replaced by the second wave splitter. The second wave splitter is connected to the PD and is also used to transmit the optical signal of the downlink wavelength corresponding to the access side optical module to the PD.

[0185] The above describes the transmission process of downlink information. Next, the transmission process of uplink information will be described.

[0186] In a wavelength division system, uplink information is transmitted via an optical signal of an uplink wavelength. Each access side optical module also corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths. For example, if the system includes 8 access side optical modules, then these 8 access side optical modules correspond to 8 different uplink wavelengths. In an embodiment of the present application, the uplink wavelength is different from the downlink wavelength, for example, the uplink wavelength is greater than the downlink wavelength, or the uplink wavelength is less than the downlink wavelength, so that it is easy to realize the transmission of uplink and downlink signals in one optical cable, and the networking is relatively simple.

[0187] In the process of transmitting uplink information, each of the multiple access side optical modules is also used to transmit an optical signal of the uplink wavelength corresponding to the access side optical module to the connected port; the intermediate device is also used to obtain the optical signals of the multiple uplink wavelengths transmitted by the multiple access side optical modules through the above-mentioned multiple ports, merge the optical signals of the multiple uplink wavelengths into a first uplink optical signal, and transmit the first uplink optical signal to the central optical module; the central optical module is also used to decompose the first uplink optical signal into the optical signals of the multiple uplink wavelengths. Among them, each optical signal of the uplink wavelength carries the uplink information transmitted by the corresponding access device, and the first uplink optical signal carries the uplink information transmitted by the above-mentioned multiple access devices. That is, the optical signal of the uplink wavelength transmitted by the access side optical module is a single wavelength signal (i.e., a gray light signal), and the first uplink optical signal is a composite optical signal.

[0188] Optionally, the access side optical module also includes a first laser, which is connected to the port through an optical fiber; the first laser is used to generate an optical signal of an upstream wavelength corresponding to the access side optical module, and transmit the optical signal of the upstream wavelength to the connected port.

[0189] The first laser is a single-wavelength laser, that is, a single-frequency laser, or the first laser is a wavelength-tunable laser. Figure 2 and Figure 3The first laser includes an LD, which is a single-frequency laser that can generate gray light of a single frequency (i.e., an optical signal of a single wavelength) or a wavelength-tunable laser that can generate optical signals of multiple wavelengths. In the embodiment of the present application, the LD is used to generate an optical signal of an uplink wavelength corresponding to the access side optical module.

[0190] Alternatively, see Figure 2 and Figure 3 The intermediate device also includes an optical coupler, which is called the first optical coupler. The central optical module includes a wave splitter, which is called the first wave splitter. The first optical coupler is connected to the above-mentioned multiple ports through optical fibers respectively; the first optical coupler is used to couple the above-mentioned multiple upstream wavelength optical signals into a first upstream optical signal by energy merging; the first wave splitter is used to decompose the first upstream optical signal into the above-mentioned multiple upstream wavelength optical signals.

[0191] That is, the first optical coupler can couple multiple input signals into one signal. In the embodiment of the present application, the first optical coupler has multiple input ends and one output end, each of the multiple input ends can receive an optical signal of any wavelength, and the output end is used to output the first uplink optical signal obtained by coupling. It can be seen that the tools of the optical coupler are opposite to the functions of the optical splitter.

[0192] The first optical coupler can be implemented by an optical coupling, or by other devices with similar functions, which is not limited in the embodiments of the present application. In the embodiments of the present application, the optical coupler and the optical splitter can be the same device, that is, the device has the functions of both optical splitting and optical coupling. Of course, in some other embodiments, the optical coupler and the optical splitter can also be different devices.

[0193] The first splitter can split a signal into multiple signals with different wavelengths according to the wavelength. For example, the first splitter has an input end and multiple output ends, and the multiple output ends correspond to multiple upstream wavelengths one by one. Each output end is connected to one of the multiple optoelectronic converter modules according to the corresponding upstream wavelength, that is, the upstream wavelength corresponding to each output end is the same as the upstream wavelength corresponding to the connected optoelectronic converter module. The input end of the first splitter is used to receive the first upstream optical signal, and the multiple output ends are used to output optical signals corresponding to the upstream wavelengths to the connected optoelectronic converter modules.

[0194] See also Figure 2 and Figure 3 The first splitter may be implemented by a demultiplexer (DEMUX) or by other devices with similar functions, which is not limited in the embodiments of the present application.

[0195] Each optoelectronic conversion submodule is used to convert the received optical signal into a first uplink electrical signal after receiving the optical signal of the uplink wavelength corresponding to the optoelectronic conversion submodule, and transmit the first uplink electrical signal to other modules of the routing and switching device, so that the routing and switching device can obtain corresponding uplink information from the first uplink electrical signal, or perform other processing on the first uplink electrical signal, such as transmitting the first uplink electrical signal to other network devices.

[0196] From the foregoing, it can be seen that in one implementation, if Figure 2 As shown, the intermediate device also includes a first beam splitter, and the central optical module also includes a second beam splitter. Then, optionally, the first beam splitter is also connected to the first optical coupler through an optical fiber, and the second beam splitter is also connected to the first wave splitter through an optical fiber; the first optical coupler is also used to transmit the first uplink optical signal to the first beam splitter; the first beam splitter is used to transmit the first uplink optical signal to the second beam splitter; the second beam splitter is used to transmit the first uplink optical signal to the first wave splitter.

[0197] In another implementation, Figure 3 As shown, the first wave splitter of the central optical module is directly connected to the first optical coupler of the intermediate device through an optical fiber; the first optical coupler is used to transmit the first uplink optical signal to the first wave splitter.

[0198] In terms of uplink and downlink, when the intermediate device includes a first optical splitter and the central optical module includes a second optical splitter, the intermediate device and the central optical module can communicate by connecting the first optical splitter and the second optical splitter through an optical cable, which makes networking simpler. When the first combiner of the central optical module is directly connected to the first optical splitter of the intermediate device through an optical fiber, and the first splitter of the central optical module is directly connected to the first optical coupler of the intermediate device through an optical fiber, the intermediate device and the central optical module can also communicate through two optical cables.

[0199] It should be noted that the first optical splitter and the second optical splitter can filter the uplink optical signal and the downlink optical signal by the difference in the uplink and downlink wavelengths. For example, if the uplink wavelength is greater than the first threshold and the downlink wavelength is less than the first threshold, the first optical splitter can use the optical signal with a wavelength greater than the first threshold as the uplink optical signal and transmit the uplink optical signal to the central optical module, and use the optical signal with a wavelength less than the first threshold as the downlink optical signal and transmit the downlink optical signal to the first optical splitter.

[0200] Combination Figure 2 and Figure 3 From the above-mentioned first specific implementation method, multiple access side optical modules can be mixed and inserted, and the intermediate equipment can be passive. This optical networking method is more flexible and reduces the difficulty of equipment management and maintenance.

[0201] Optionally, each of the multiple ports of the intermediate device is implemented by a physical port, which can both receive optical signals from the access side optical module and send optical signals to the access side optical module. Alternatively, each of the multiple ports is implemented by a pair of physical ports, which includes an uplink port and a downlink port, wherein the uplink port is used to receive optical signals from the access side optical module and the downlink port is used to send optical signals to the access side optical module. Regardless of whether each port of the intermediate device is implemented by a physical port or a pair of physical ports, each port is connected to the access side optical module through two optical cables to transmit the uplink optical signal and the downlink optical signal respectively through the two optical cables.

[0202] Taking the number of the multiple access side optical modules as 8 as an example, the 8 access side optical modules can be mixed into the 8 ports of the intermediate device, each of the 8 ports includes two physical ports, then each of the 8 access side optical modules is connected to the two physical ports included in one port through 2 optical cables.

[0203] As can be seen from the above, this solution can be applied to the optical networking of the park. The central switch of the park, as a routing switching device, usually includes multiple central optical modules, each of which communicates with multiple access side optical modules, thereby realizing a larger-scale optical communication system through multiple central optical modules. Each central optical module and the multiple access side optical modules connected to it can realize flexible networking according to the first specific implementation method introduced above.

[0204] For example, a routing switching device includes 8 central optical modules. Each of the 8 central optical modules is connected to 8 access side optical modules through an intermediate device. Then, the routing switching device can communicate with 64 access side optical modules, and the 8 access side optical modules connected to each central optical module can be mixed and inserted on the 8 ports of the intermediate device connected to the central optical module. If the 64 access side optical modules are divided into 8 groups, the first specific implementation method can realize the intra-group mixing of optical modules. Each group includes 8 access side optical modules connected to a central optical module.

[0205] Figure 4 This is another architecture diagram of an optical communication system provided in an embodiment of the present application. Figure 4 The specific process of transmitting downlink information and transmitting uplink information in the second specific implementation manner is introduced.

[0206] First, the specific process of transmitting downlink information is introduced.

[0207] In the wavelength division system, downlink information is transmitted through optical signals of downlink wavelengths. Each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths. For example, if the system includes 8 access side optical modules, then these 8 access side optical modules correspond to 8 different downlink wavelengths one by one.

[0208] During the transmission of downlink information, the central optical module is used to transmit a first downlink optical signal to the intermediate device. The first downlink optical signal has multiple downlink wavelengths, and the multiple downlink wavelengths include a downlink wavelength corresponding to at least one access side optical module. The first downlink optical signal carries downlink information transmitted to at least one access device. The intermediate device is used to receive the second downlink optical signal, divide the second downlink optical signal into multiple third downlink optical signals, and transmit a third downlink optical signal to the access side optical module connected to the port through each of the multiple ports. Each of the multiple third downlink optical signals has multiple downlink wavelengths and also carries downlink information transmitted to the at least one access device. Each of the multiple access side optical modules is used to receive the fourth downlink optical signal, and obtain the optical signal of the downlink wavelength corresponding to the access side optical module from the received fourth downlink optical signal. Among them, the multiple access devices are the access devices to which the multiple access side optical modules belong. The second downlink optical signal is an optical signal after the first downlink optical signal is transmitted through the optical fiber between the central optical module and the intermediate device, and the fourth downlink optical signal is an optical signal after the third downlink optical signal is transmitted through the optical fiber between the access side optical module and the port.

[0209] That is, the first downstream optical signal and the second downstream optical signal are both a composite optical signal. The intermediate device divides the received composite optical signal into multiple composite optical signals, thereby transmitting a composite optical signal with multiple downstream wavelengths to multiple access side optical modules. In this way, even if the multiple access side optical modules are mixed, they can all obtain optical signals with corresponding downstream wavelengths from the received composite optical signal, and then the above-mentioned multiple access devices can all obtain corresponding downstream information from the optical signals with corresponding downstream wavelengths, thereby ensuring communication reliability.

[0210] The central optical module includes a first combiner (such as Figure 4 The intermediate device also includes a second optical splitter (such as Figure 4 The optical splitter shown in the figure), the second optical splitter is connected to the above-mentioned multiple ports respectively through optical fibers, and the second optical splitter is also connected to the central optical module through optical fibers; the first combiner is used to obtain the optical signals of the above-mentioned multiple downstream wavelengths, and combine the optical signals of the above-mentioned multiple downstream wavelengths into a first downstream optical signal; the second optical splitter is used to receive the second downstream optical signal, and divide the second downstream optical signal into the above-mentioned multiple third downstream optical signals by energy splitting, and transmit one third downstream optical signal to each of the multiple ports.

[0211] The first combiner here has the same specific function and implementation as the first combiner in the first specific implementation, which will not be described in detail here. The second optical splitter here has the same specific function and implementation as the first optical splitter in the first specific implementation, which will not be described in detail here.

[0212] Optionally, the central optical module also includes multiple optoelectronic conversion submodules, and the first combiner is connected to the multiple optoelectronic conversion submodules respectively through optical fibers. The optoelectronic conversion submodules correspond to an upstream wavelength and a downstream wavelength with a matching relationship. Different optoelectronic conversion submodules correspond to different upstream wavelengths and corresponding downstream wavelengths. Each optoelectronic conversion submodule is used to obtain a first downstream electrical signal transmitted by the routing switching device, convert the obtained first downstream electrical signal into an optical signal of the downstream wavelength corresponding to the optoelectronic conversion submodule, and transmit the optical signal of the downstream wavelength corresponding to the optoelectronic conversion submodule to the first combiner. The first combiner is used to obtain optical signals of multiple downstream wavelengths transmitted by the multiple optoelectronic conversion submodules. Among them, the first downstream electrical signal carries downstream information.

[0213] Figure 4 The structure and Figure 2 and Figure 3 The structure of the photoelectric conversion submodule is similar and will not be repeated here.

[0214] The central optical module also includes a splitter, which is called a second splitter. The second splitter is connected to the first combiner of the central optical module and is also connected to the second splitter of the intermediate device. The second splitter is used to transmit the first downlink optical signal to the second splitter. That is, different from the first specific implementation method mentioned above, in the second specific implementation method, the intermediate device may not include a splitter.

[0215] In the case where the intermediate device does not include a spectrometer, in order to distinguish between uplink and downlink signals, the first spectrometer in the first specific implementation method can be sunk into the access side optical module. For example, in the second specific implementation method, the access side optical module includes a spectrometer and a filter, the spectrometer is called the third spectrometer, the filter is called the second filter, the third spectrometer is connected to the second filter and the port of the intermediate device through optical fibers; the third spectrometer is used to receive the third downlink optical signal transmitted by the port of the intermediate device through the optical fiber, obtain the fourth downlink optical signal, and transmit the fourth downlink optical signal to the second filter; the second filter is used to filter the fourth downlink optical signal to obtain an optical signal of the downlink wavelength corresponding to the access side optical module.

[0216] See also Figure 4, the access side optical module also includes a PD, the PD is connected to the second filter through an optical fiber, and the second filter is also used to transmit an optical signal of a downlink wavelength corresponding to the access side optical module to the PD. The second filter here has the same specific function and implementation as the first filter in the above-mentioned first specific implementation method, which will not be repeated here. Similarly, the PD here has the same specific function and implementation as the PD in the above-mentioned first specific implementation method, which will not be repeated here.

[0217] The second filter here can also be replaced by a splitter. For example, the access side optical module includes a third splitter (which can be implemented by DEMUX), and the third splitter is used to split the third downstream optical signal transmitted by the port to obtain optical signals of multiple downstream wavelengths, and determine the optical signal of the downstream wavelength corresponding to the access side optical module from the optical signals of multiple downstream wavelengths. The specific function and implementation method of the third splitter here are the same as those of the third splitter in the first specific implementation method mentioned above, and will not be repeated here.

[0218] The above describes the transmission process of downlink information. Next, the transmission process of uplink information will be described.

[0219] In a wavelength division system, uplink information is transmitted via an optical signal of an uplink wavelength. Each access side optical module also corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths. For example, if the system includes 8 access side optical modules, then these 8 access side optical modules correspond to 8 different uplink wavelengths. In an embodiment of the present application, the uplink wavelength is different from the downlink wavelength, for example, the uplink wavelength is greater than the downlink wavelength, or the uplink wavelength is less than the downlink wavelength, so that it is easy to realize the transmission of uplink and downlink signals in one optical cable, and the networking is relatively simple.

[0220] In the process of transmitting uplink information, each of the multiple access side optical modules is also used to transmit an optical signal of the uplink wavelength corresponding to the access side optical module to the connected port; the intermediate device is also used to obtain the optical signals of the multiple uplink wavelengths transmitted by the multiple access side optical modules through the above-mentioned multiple ports, merge the optical signals of the multiple uplink wavelengths into a first uplink optical signal, and transmit the first uplink optical signal to the central optical module; the central optical module is also used to decompose the first uplink optical signal into the multiple uplink wavelength optical signals. Among them, each uplink wavelength optical signal carries the uplink information transmitted by the corresponding access device, and the first uplink optical signal carries the uplink information transmitted by the above-mentioned multiple access devices. That is, the optical signal of the uplink wavelength transmitted by the access side optical module is a single wavelength signal, and the first uplink optical signal is a composite optical signal.

[0221] The access side optical module further includes a second laser (such as Figure 4LD in the figure), the second laser is connected to the third beam splitter through an optical fiber; the second laser is used to generate an optical signal of an uplink wavelength corresponding to the access side optical module, and transmit the optical signal of the uplink wavelength to the third beam splitter; the third beam splitter is also used to transmit the optical signal of the uplink wavelength to the connected port.

[0222] The specific function and implementation method of the second laser here are the same as those of the first laser in the above-mentioned first specific implementation method, and will not be repeated here.

[0223] The second optical splitter included in the intermediate device is also used to couple the optical signals of multiple upstream wavelengths transmitted by multiple ports into a first upstream optical signal by means of energy merging, and transmit the first upstream optical signal to the central optical module. That is, the second optical splitter here has the functions of the first optical splitter and the first optical coupler in the above-mentioned first implementation method, and the division of the downstream signal and the coupling of the upstream signal are realized by this optical splitter. In this implementation method, the communication between the intermediate device and the central optical module can be realized by connecting the second optical splitter and the second optical splitter through an optical cable, and the networking is relatively simple, which is convenient for the maintenance and management of the equipment.

[0224] Alternatively, the intermediate device also includes a second optical coupler, which is used to couple the optical signals of multiple upstream wavelengths transmitted by multiple ports into a first upstream optical signal by energy merging, and transmit the first upstream optical signal to the central optical module. That is, the intermediate device includes both a second optical splitter and a second optical coupler, and the division of the downstream signal and the coupling of the upstream signal are respectively realized by these two devices. The second optical coupler is respectively connected to the multiple ports through optical fibers, and the second optical coupler is also connected to the second optical splitter of the central optical module.

[0225] The specific function and implementation method of the second optical coupler here are the same as those of the first optical coupler in the above-mentioned first specific implementation method, and will not be repeated here.

[0226] The central optical module also includes a first splitter, the first splitter is connected to the second splitter, and the first splitter is used to receive the first uplink optical signal transmitted by the second splitter, and decompose the first uplink optical signal into the above-mentioned multiple uplink wavelength optical signals. The specific function and implementation method of the first splitter here are the same as those of the first splitter in the above-mentioned first specific implementation method, and will not be repeated here.

[0227] After the first splitter transmits the optical signals of multiple uplink wavelengths to the corresponding optoelectronic conversion sub-modules respectively, the optoelectronic conversion sub-module converts the received optical signal into a first uplink electrical signal, and transmits the first uplink electrical signal to other modules of the routing and switching device, so that the routing and switching device can obtain corresponding uplink information from the first uplink electrical signal, or perform other processing on the first uplink electrical signal, such as transmitting the first uplink electrical signal to other network devices.

[0228] In terms of uplink and downlink, the first optical splitter of the intermediate device in the first specific implementation is sunk into the access side optical module, thus evolving into the above-mentioned second specific implementation. This can also realize the mixed insertion of multiple access side optical modules, specifically the mixed insertion of optical modules within a group, improve the flexibility of optical networking, and reduce the difficulty of equipment management and maintenance.

[0229] The implementation method of multiple ports of the intermediate device in the second specific implementation is similar to the implementation method of multiple ports in the above-mentioned first specific implementation, and will not be repeated here.

[0230] Figure 5 and Figure 6 This is an architecture diagram of two optical communication systems provided in the embodiments of the present application. Figure 5 and Figure 6 The specific process of transmitting downlink information and transmitting uplink information in the third specific implementation manner is introduced.

[0231] See also Figure 5 and Figure 6 The optical communication system includes a routing switching device (LSW in the figure), the routing switching device is plugged with a central optical module or integrated with a central optical module, the optical communication system also includes an intermediate device and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the routing switching device also includes a transceiver matching module, and the central optical module includes a first splitter (such as Figure 5 or Figure 6 The DEMUX in the central optical module shown in the figure) and multiple optoelectronic conversion sub-modules, the first splitter is connected to the multiple optoelectronic conversion sub-modules respectively through optical fibers, the optoelectronic conversion sub-modules correspond to an uplink wavelength and a downlink wavelength with a matching relationship, different optoelectronic conversion sub-modules correspond to different uplink wavelengths and corresponding downlink wavelengths, and the intermediate device includes a first optical coupler (such as Figure 5 or Figure 6The optical coupler in the intermediate device shown in the figure and multiple ports, the first optical coupler is connected to the multiple ports respectively through optical fibers, each access side optical module is connected to any port of the intermediate device through optical fibers, different access side optical modules are connected to different ports, each port corresponds to a downlink wavelength, and different ports correspond to different downlink wavelengths, each access side optical module corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths.

[0232] Figure 5 or Figure 6 The structure and Figure 2 and Figure 3 The structure of the photoelectric conversion submodule is similar and will not be repeated here.

[0233] Each optoelectronic conversion submodule is used to obtain a first downstream electrical signal transmitted by the routing switching device, convert the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmit the optical signal of the downstream wavelength to the intermediate device;

[0234] The intermediate device is used to obtain optical signals of multiple downstream wavelengths, and transmit the optical signal of the downstream wavelength corresponding to the port to the access side optical module connected to the port through each port of the multiple ports, wherein the multiple downstream wavelengths include at least one downstream wavelength corresponding to the above-mentioned port;

[0235] The first optical module among the multiple access side optical modules is used to receive an optical signal of a first downstream wavelength transmitted by the first port, and is also used to transmit an optical signal of a first upstream wavelength to the first port, the first downstream wavelength does not match the first upstream wavelength, the first optical module is any one of the multiple access side optical modules, and the first port is a port to which the first optical module is connected;

[0236] The intermediate device is also used to receive optical signals of multiple upstream wavelengths through multiple ports, couple the optical signals of the multiple upstream wavelengths into a first upstream optical signal through a first optical coupler, and transmit the first upstream optical signal to the central optical module, wherein the multiple upstream wavelengths include at least one upstream wavelength corresponding to the access side optical module;

[0237] The first demultiplexer is used to obtain the first uplink optical signal, decompose the first uplink optical signal into the optical signals of the multiple uplink wavelengths, and transmit the optical signals of the uplink wavelengths corresponding to each of the optical-electrical conversion submodules to the multiple optical-electrical conversion submodules respectively;

[0238] Each optoelectronic conversion submodule is also used to convert an optical signal of an uplink wavelength corresponding to the optoelectronic conversion submodule into a first uplink electrical signal, and transmit the first uplink electrical signal to the transceiver matching module;

[0239] The transceiver matching module is used to match multiple first downlink electrical signals transmitted by multiple optoelectronic conversion submodules with multiple first uplink electrical signals to determine the optical signal of the uplink wavelength sent by the same access side optical module and the optical signal of the downlink wavelength received. The multiple first downlink electrical signals include the first downlink electrical signals transmitted by multiple optoelectronic conversion submodules, and the multiple first uplink electrical signals include the first uplink electrical signals transmitted by multiple optoelectronic conversion submodules.

[0240] It can be seen that even if the multiple access side optical modules are mixed and inserted into multiple ports of the intermediate device, causing one or some ports of the intermediate device to receive an optical signal of any possible upstream wavelength among the multiple upstream wavelengths, the optical signal of the upstream wavelength can be transmitted to the central optical module by coupling through the first optical coupler of the intermediate device. Even if this causes the downstream optical signal and the upstream optical signal transmitted by the same optoelectronic conversion submodule to not be optical signals of the same access side optical module, that is, the transceiver of the same optoelectronic module does not match, this solution can also achieve transceiver matching through the transceiver matching module of the routing switching device.

[0241] The specific function and implementation method of the first splitter of the central optical module here are the same as those of the first splitter in the above-mentioned first specific implementation method, which will not be repeated here.

[0242] The at least one port includes a port that is currently communicating. For example, when all ports of the intermediate device are currently transmitting downlink optical signals, the at least one port includes all ports of the intermediate device. The at least one port in the following text is similar.

[0243] The central optical module further includes a first combiner (such as Figure 5 or Figure 6 The MUX in the central optical module shown in the figure), the intermediate device also includes a second splitter (such as Figure 5 or Figure 6 In the DEMUX in the intermediate device shown in the figure, the first combiner is connected to the above-mentioned multiple optoelectronic conversion sub-modules respectively through optical fibers, and the second splitter is connected to the multiple ports of the intermediate device respectively through optical fibers; the first combiner is used to combine the above-mentioned multiple downstream wavelength optical signals into a first downstream optical signal, and transmit the first downstream optical signal to the intermediate device; the second splitter is used to receive the second downstream optical signal, decompose the second downstream optical signal into the above-mentioned multiple downstream wavelength optical signals, and transmit the downstream wavelength optical signal corresponding to each port to the multiple ports respectively.

[0244] The specific function and implementation method of the first combiner here are the same as those of the first combiner in the above-mentioned first specific implementation method, and will not be repeated here.

[0245] The second splitter here can split a signal into multiple signals with different wavelengths according to the wavelength. For example, the second splitter has an input end and multiple output ends, and the multiple output ends correspond to multiple downstream wavelengths one by one. Each output end is connected to one of the multiple ports according to the corresponding downstream wavelength, that is, the downstream wavelength corresponding to each output end is the same as the downstream wavelength corresponding to the connected port. The input end of the second splitter is used to receive the second downstream optical signal, and the multiple output ends are used to output the optical signal of the downstream wavelength corresponding to the port to the connected port.

[0246] In the third specific implementation method, the access side optical module does not require a filter, a splitter or a splitter. The downstream wavelength optical signal transmitted by the port of the intermediate device can be directly transmitted to the PD included in the access side optical module, and the upstream wavelength optical signal generated by the LD included in the access side optical module can also be directly transmitted to the port of the intermediate device.

[0247] Similar to the first specific implementation, see Figure 5 , the intermediate device also includes a first optical splitter, and the central optical module also includes a second optical splitter. The first optical splitter is connected to the second splitter, the first optical coupler, and the second optical splitter through optical fibers, and the second optical splitter is also connected to the first combiner and the first splitter through optical fibers; the first optical splitter is used to receive the first uplink optical signal transmitted by the first optical coupler, transmit the first uplink optical signal to the second optical splitter, and receive the first downlink optical signal transmitted by the second optical splitter to obtain the second downlink optical signal, and transmit the second downlink optical signal to the second splitter; the second optical splitter is used to receive the first downlink optical signal transmitted by the first combiner, transmit the first downlink optical signal to the first optical splitter, and receive the first uplink optical signal transmitted by the first optical splitter to obtain the second uplink optical signal, and transmit the second uplink optical signal to the first splitter. In this way, communication between the intermediate device and the central optical module can be achieved through one optical cable, and networking is simpler, easier to manage and maintain.

[0248] Alternatively, see Figure 6 , the first combiner is connected to the second splitter, the first optical coupler is connected to the first splitter; the first combiner is used to transmit the first downlink optical signal to the second splitter; the first optical coupler is used to transmit the first uplink optical signal to the first splitter. In this way, communication can be achieved between the intermediate device and the central optical module through two optical cables.

[0249] The implementation method of multiple ports of the intermediate device in the third specific implementation method is similar to the implementation method of multiple ports in the above-mentioned first specific implementation method, and will not be repeated here.

[0250] The transceiver matching module in the routing switching device can be a module in a chip in the routing switching device, such as a chip in a central switch. This solution uses the upper chip for transceiver matching, and ensures the reliability of optical communication under the premise of mixed insertion of access side optical modules.

[0251] Combination of the above Figures 2 to 6 Three specific implementation methods provided by the embodiments of this application are introduced. These three specific implementation methods can realize the mixed insertion of access side optical modules under the premise of ensuring the reliability of optical communication, improve the flexibility of optical networking, and reduce the difficulty of equipment management and maintenance. The above three specific implementation methods can be used separately or in combination to realize flexible networking in different scenarios.

[0252] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0253] As can be seen from the above, in order to realize the hybrid insertion of the access side optical module, the embodiment of the present application provides at least three specific implementation methods of the optical communication system, wherein the second specific implementation method can be understood as sinking the optical splitter included in the intermediate device in the first implementation method into the access side optical module, that is, the second specific implementation method is similar to the principle of the first specific implementation method, while the principle of the third specific implementation method is different from the principle of the first two specific implementation methods. Next, the corresponding optical communication methods of these optical communication systems will be introduced in two embodiments. The first of these two embodiments corresponds to the first two specific implementation methods, and the second embodiment corresponds to the third specific implementation.

[0254] Figure 7 It is a flow chart of an optical communication method provided by an embodiment of the present application. This method embodiment corresponds to the first two specific implementations mentioned above. The method is applied to an optical communication system, which includes a central optical module, an intermediate device, and multiple access side optical modules. The central optical module is connected to the intermediate device through an optical fiber. The intermediate device includes multiple ports. Each access side optical module is connected to any one of the multiple ports through an optical fiber. Different access side optical modules are connected to different ports. Each access side optical module corresponds to a downlink wavelength, and different access side optical modules correspond to different downlink wavelengths. Please refer to Figure 7 , the method comprises the following steps.

[0255] Step 701: A central optical module generates optical signals of multiple downstream wavelengths, where the multiple downstream wavelengths include at least one downstream wavelength corresponding to an access-side optical module.

[0256] The central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to access the optical communication system through the central optical module.

[0257] The central optical module includes multiple optoelectronic conversion submodules, and the optoelectronic conversion submodules correspond to an upstream wavelength and a downstream wavelength with a matching relationship. Different optoelectronic conversion submodules correspond to different upstream wavelengths and corresponding downstream wavelengths. Each optoelectronic conversion submodule obtains a first downstream electrical signal transmitted by a routing switching device, and converts the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule. The first downstream electrical signal originates from other network devices or is generated by a routing switching device. The first downstream electrical signal carries downstream information transmitted to the access side optical module. Each of the above-mentioned multiple downstream wavelength optical signals carries downstream information transmitted to the corresponding access side optical module.

[0258] Step 702: The central optical module combines the optical signals of the multiple downstream wavelengths into a first downstream optical signal, where the first downstream optical signal has the multiple downstream wavelengths.

[0259] The central optical module includes a first combiner, which is connected to the above-mentioned multiple optoelectronic conversion submodules through optical fibers. The optoelectronic conversion submodule transmits the optical signal of the downstream wavelength corresponding to the optoelectronic conversion submodule to the first combiner. After the first combiner obtains the optical signals of multiple downstream wavelengths transmitted by the multiple optoelectronic conversion submodules, it combines the optical signals of the multiple downstream wavelengths into a first downstream optical signal. The first downstream optical signal is a composite optical signal with multiple downstream wavelengths. The first downstream optical signal carries the downstream information transmitted to the multiple access side optical modules.

[0260] In addition to combining the optical signals of the multiple downstream wavelengths through the first combiner, the central optical module can also perform this operation through other devices with similar functions, which is not limited in the embodiments of the present application.

[0261] Step 703: The central optical module transmits a first downlink optical signal to the intermediate device.

[0262] In one implementation, the central optical module further includes a second optical splitter, the first combiner is further connected to the second optical splitter via an optical fiber, and the second optical splitter is connected to the intermediate device via an optical fiber. The first combiner transmits the first downstream optical signal to the second optical splitter, and the second optical splitter transmits the first downstream optical signal to the intermediate device.

[0263] In another implementation, the first combiner is directly connected to the intermediate device via an optical fiber. The first combiner transmits the first downlink optical signal to the intermediate device.

[0264] The above two implementation methods correspond to Figure 2 and Figure 3 The optical communication system shown corresponds to the first specific implementation of the optical communication system. In the second specific implementation of the optical communication system, the central optical module further includes a second beam splitter, and the second beam splitter is connected to the intermediate device via an optical fiber.

[0265] Step 704: The intermediate device receives a second downstream optical signal, where the second downstream optical signal is the first downstream optical signal transmitted through the optical fiber between the central optical module and the intermediate device.

[0266] In the implementation mode in which the central optical module also includes a second optical splitter, corresponding to the first specific implementation mode of the optical communication system, the intermediate device also includes a first optical splitter, and the first optical splitter is connected to the second optical splitter through an optical fiber. The second optical splitter transmits a first downstream optical signal to the first optical splitter, and the first optical splitter receives the first downstream optical signal transmitted by the second optical splitter to obtain a second downstream optical signal. In addition, the intermediate device also includes a first optical splitter, and the first optical splitter is connected to the first optical splitter through an optical fiber, and the first optical splitter also transmits the second downstream optical signal to the first optical splitter.

[0267] In the implementation mode in which the first combiner of the central optical module is directly connected to the intermediate device through an optical fiber, corresponding to the first specific implementation mode of the optical communication system, the intermediate device also includes a first optical splitter, and the first combiner is connected to the first optical splitter through an optical fiber. The first combiner transmits a first downstream optical signal to the first optical splitter, and the first optical splitter receives the first downstream optical signal transmitted by the first combiner to obtain a second downstream optical signal.

[0268] Corresponding to the second specific implementation of the optical communication system, the central optical module also includes a second optical splitter, the intermediate device includes a second optical splitter, the second optical splitter is connected to the second optical splitter through an optical fiber, and the second optical splitter transmits the first downstream optical signal to the second optical splitter. The second optical splitter receives the first downstream optical signal transmitted by the second optical splitter to obtain a second downstream optical signal.

[0269] Step 705: The intermediate device divides the second downstream optical signal into a plurality of third downstream optical signals, each of the plurality of third downstream optical signals having the plurality of downstream wavelengths.

[0270] That is, the third downstream optical signal is also a composite optical signal having the multiple downstream wavelengths. The third downstream optical signal also carries the downstream information transmitted to the multiple access-side optical modules.

[0271] As can be seen from the above, the intermediate device further includes a first optical splitter or a second optical splitter. Then, the first optical splitter or the second optical splitter divides the second downstream optical signal into a plurality of third downstream optical signals by energy splitting.

[0272] Taking the first optical splitter as an example, the first optical splitter divides the second downstream optical signal into multiple third downstream optical signals in an energy-equalizing manner, and the energy of the multiple third downstream optical signals is the same. Alternatively, the first optical splitter may not evenly divide the energy, but distribute the energy of the second downstream optical signal according to other proportions, that is, the energy of the multiple third downstream optical signals obtained may be different, and the embodiments of the present application do not limit this. Among them, in the case where the intermediate device is a passive device, the sum of the energy of the multiple third downstream optical signals does not exceed the energy of the second downstream optical signal. In the case where the intermediate device is an active device, the sum of the energy of the multiple third downstream optical signals may exceed the energy of the second downstream optical signal. For example, the intermediate device also includes an energy amplifier, which uses the energy amplifier to make the sum of the energy of the multiple third downstream optical signals exceed the energy of the second downstream optical signal, thereby improving the quality of the third downstream optical signal.

[0273] In addition to distributing energy to the second downstream wavelength optical signal through the first optical splitter or the second optical splitter, the intermediate device may also perform this operation through other devices with similar functions, which is not limited in the embodiments of the present application.

[0274] Step 706: The intermediate device transmits a third downstream optical signal to the access-side optical module connected to each port through the multiple ports.

[0275] In the implementation mode where the intermediate device includes the first optical splitter, the first optical splitter is also connected to multiple ports of the intermediate device through optical fibers. The first optical splitter transmits the third downstream optical signal to each of the multiple ports, thereby transmitting the third downstream optical signal to the connected access side optical module through each port.

[0276] In the implementation mode where the intermediate device includes the second optical splitter, the second optical splitter is also connected to multiple ports of the intermediate device through optical fibers. The second optical splitter transmits the third downstream optical signal to each of the multiple ports, thereby transmitting the third downstream optical signal to the connected access side optical module through each port.

[0277] Step 707: the access side optical module receives a fourth downstream optical signal, where the fourth downstream optical signal is the third downstream optical signal transmitted through the optical fiber between the access side optical module and the port.

[0278] Taking the first optical module among the multiple access side optical modules as an example, the first optical module is connected to the first port of the intermediate device, and the first optical module receives the third downstream optical signal transmitted by the first port to obtain the fourth downstream optical signal, which can be briefly described as follows: the first optical module receives the downstream optical signal transmitted by the first port. The downstream optical signal received by the first optical module includes the optical signals of the above-mentioned multiple downstream wavelengths.

[0279] The first optical module is any one of the multiple access side optical modules. The access side optical module is inserted into an access device, or the access side optical module is integrated into an access device, and the access device is used to access the optical communication system through the first optical module.

[0280] Step 708: The access-side optical module obtains an optical signal of a downstream wavelength corresponding to the access-side optical module from the fourth downstream optical signal.

[0281] Still taking the first optical module as an example, the first optical module corresponds to the first downstream wavelength, and the first optical module obtains the optical signal of the first downstream wavelength from the fourth downstream optical signal.

[0282] Corresponding to the first specific implementation of the optical communication system, in the embodiment of the present application, the first optical module includes a first filter. The first filter filters the downlink optical signal received by the first optical module to obtain an optical signal of a first downlink wavelength. Alternatively, in some other embodiments, the first optical module includes a second splitter, and the second splitter splits the downlink optical signal received by the first optical module, and determines the optical signal of the first downlink wavelength from the multiple downlink wavelength optical signals obtained by the splitting.

[0283] Corresponding to the second specific implementation of the optical communication system, in the embodiment of the present application, the first optical module includes a third beam splitter and a second filter (or a third wave splitter), and the third beam splitter is connected to the first port and the first filter respectively through optical fibers. The first beam splitter receives the third downstream optical signal transmitted by the first port, transmits the third downstream optical signal to the second filter, and the second filter splits the received fourth downstream optical signal to obtain an optical signal of the first downstream wavelength.

[0284] In addition to processing the downlink optical signal received by the access side optical module through a filter splitter to obtain an optical signal of a downlink wavelength corresponding to the access side optical module, the access side optical module can also perform this operation through other devices with similar functions, and the embodiments of the present application are not limited to this.

[0285] In addition, different access side optical modules can obtain optical signals of corresponding downstream wavelengths in the same or different ways. For example, multiple access side optical modules all obtain optical signals of corresponding downstream wavelengths through the first filter, or some access side optical modules obtain optical signals of corresponding downstream wavelengths through the first filter, and other access side optical modules obtain optical signals of corresponding downstream wavelengths through the second splitter.

[0286] Optionally, the first optical module also includes a PD. In addition to obtaining the optical signal of the first downstream wavelength, the first filter (or the second splitter or the second filter or the third splitter) transmits the optical signal of the first downstream wavelength to the PD. The PD performs photoelectric conversion on the optical signal of the first downstream wavelength to obtain a second downstream electrical signal, and transmits the second downstream electrical signal to other modules of the access device, so that the other modules of the access device can obtain corresponding downstream information from the second downstream electrical signal, or transmit the second downstream electrical signal to a user terminal connected to the access device.

[0287] The transmission process of downlink information in the first specific implementation manner is introduced above through steps 701 to 708. Next, the transmission process of uplink information in the first specific implementation manner will be introduced through steps 801 to 806.

[0288] In the embodiment of the present application, each access side optical module also corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths. Figure 8 ,The transmission process of uplink information includes the following steps.

[0289] Step 801: The access-side optical module generates an optical signal corresponding to the upstream wavelength, and transmits the optical signal corresponding to the upstream wavelength to the connected port.

[0290] The optical signal of the uplink wavelength carries the uplink information transmitted by the corresponding access-side optical module.

[0291] Taking the first optical module in the above text as an example, the first optical module also corresponds to the first uplink wavelength, generates an optical signal of the first uplink wavelength, and transmits the optical signal of the first uplink wavelength to the first port. The optical signal of the first uplink wavelength carries the uplink information transmitted by the first optical module.

[0292] In the embodiment of the present application, the first optical module is an active optical module, for example, the first optical module further includes a laser, the laser is connected to the first port via an optical fiber, the laser generates an optical signal of a first uplink wavelength, and transmits the optical signal of the first uplink wavelength to the first port.

[0293] In a first specific implementation of the optical communication system, the laser in the first optical module may be referred to as a first laser, the first laser is connected to the first port, and the first laser transmits an optical signal of a first upstream wavelength to the first port. Optionally, the first laser includes an LD, the LD is connected to the first port through an optical fiber, the LD generates an optical signal of a first upstream wavelength, and transmits the optical signal of the first upstream wavelength to the first port.

[0294] In a second specific implementation of the optical communication system, the laser in the first optical module may be referred to as a second laser, the second laser is connected to the third beam splitter, the second laser transmits an optical signal of a first upstream wavelength to the third beam splitter, and the third beam splitter transmits the optical signal of the first upstream wavelength to the first port. Optionally, the third laser includes an LD, the LD is connected to the third beam splitter via an optical fiber, the LD generates an optical signal of a first upstream wavelength, and transmits the optical signal of the first upstream wavelength to the third beam splitter.

[0295] In some other possible embodiments, the first optical module is a passive optical module, and the first optical module can receive an optical signal of an uplink wavelength corresponding to the first optical module injected by other light sources. The injected optical signal of the uplink wavelength may not carry uplink information. The first optical module can modulate the received optical signal to obtain an optical signal that carries the uplink information and still has the uplink wavelength.

[0296] The manners in which the above-mentioned multiple access-side optical modules generate optical signals of their respective upstream wavelengths may be the same or different, and the embodiments of the present application are not limited to this.

[0297] Step 802: The intermediate device receives optical signals of multiple upstream wavelengths through multiple ports, where the multiple upstream wavelengths include at least one upstream wavelength corresponding to an access-side optical module.

[0298] The optical signals of the multiple uplink wavelengths respectively carry uplink information transmitted by the corresponding access-side optical modules.

[0299] Step 803: The intermediate device combines the optical signals of the multiple upstream wavelengths into a first upstream optical signal.

[0300] The first uplink optical signal has the multiple uplink wavelengths, and the first uplink optical signal carries the uplink information transmitted by the multiple access-side optical modules.

[0301] Corresponding to the first specific implementation of the optical communication system, the intermediate device further includes a first optical coupler, and the first optical coupler is connected to multiple ports of the intermediate device through optical fibers. The multiple ports transmit multiple upstream wavelength optical signals to the first optical coupler, and the first optical coupler combines the multiple upstream wavelength optical signals into a first upstream optical signal by energy combination.

[0302] The first optical coupler includes multiple input ends. No matter which optical signal of the upstream wavelength is received by each of the multiple input ends, the first optical coupler can couple the optical signals of the multiple upstream wavelengths received by the multiple input ends into the first upstream optical signal and output the first upstream optical signal. In the related art, the intermediate device is a splitter / combiner, that is, the intermediate device combines the optical signals of multiple upstream wavelengths through a combiner. The combiner also includes multiple input ends. The multiple input ends correspond to multiple upstream wavelengths one by one. Each input end needs to receive the optical signal of the upstream wavelength corresponding to the input end. Only in this way can the combiner combine the optical signals of multiple upstream wavelengths. If one or some input ends receive an optical signal that does not correspond to the upstream wavelength, the combiner will not be able to combine the optical signals, and the optical signal that does not correspond to the upstream wavelength will not be able to be transmitted to the central optical module. Simply put, the access side optical module, the port of the intermediate device and the input end of the combiner in the related art need to correspond to each other one by one. The access side optical module cannot be mixed. If mixed, the transmission of the optical signal that does not correspond to the upstream wavelength will fail.

[0303] Corresponding to the second specific implementation method of the optical communication system, the first splitter included in the intermediate device can not only split the downlink optical signal, but also couple multiple uplink wavelength optical signals, that is, the first splitter also combines the multiple uplink wavelength optical signals into a first uplink optical signal by energy merging.

[0304] In addition to combining optical signals of multiple upstream wavelengths through an optical coupler to obtain a first upstream optical signal, the intermediate device may also perform this operation through other devices with similar functions, which is not limited in this embodiment of the present application.

[0305] Step 804: The intermediate device transmits a first uplink optical signal to the central optical module.

[0306] In one implementation, the intermediate device further includes a first beam splitter, the central optical module further includes a second beam splitter, and the first beam splitter is connected to the second beam splitter and the first optical coupler through optical fibers. The first optical coupler transmits a first uplink optical signal to the first beam splitter, and the first beam splitter transmits the first uplink optical signal to the second beam splitter. In terms of uplink and downlink, an optical cable can be connected between the intermediate device and the central optical module.

[0307] In another implementation, the first optical coupler of the intermediate device is connected to the first splitter of the central optical module through an optical fiber, and the first optical coupler transmits the first uplink optical signal to the first splitter. In terms of uplink and downlink, two optical cables are sufficient to connect the intermediate device and the central optical module.

[0308] The above two implementations correspond to the first specific implementation of the optical communication system. In the second specific implementation of the optical communication system, the first optical splitter of the intermediate device transmits the first uplink optical signal to the second optical splitter of the central optical module.

[0309] Step 805: The central optical module receives a second uplink optical signal, where the second uplink optical signal is an optical signal of the first uplink optical signal transmitted through the optical fiber between the intermediate device and the central optical module.

[0310] In the implementation mode where the central optical module includes a second beam splitter, the second beam splitter receives the second uplink optical signal. In addition, the second beam splitter is connected to the first wave splitter of the central optical module through an optical fiber, and the second beam splitter transmits the second uplink optical signal to the first wave splitter.

[0311] In an implementation manner in which the first optical coupler of the intermediate device is connected to the first wave splitter of the central optical module through an optical fiber, the first wave splitter receives the first uplink optical signal.

[0312] Step 806: The central optical module decomposes the second uplink optical signal into optical signals of the multiple uplink wavelengths.

[0313] In the embodiment of the present application, the first splitter in the central optical module decomposes the second uplink optical signal into optical signals of multiple uplink wavelengths.

[0314] The first splitter has an input end and multiple output ends, the multiple output ends correspond to the multiple uplink wavelengths one by one, the input end receives the second uplink optical signal, and the multiple output ends respectively output optical signals of the uplink wavelengths corresponding to the output ends.

[0315] Optionally, the central optical module also includes the multiple optoelectronic conversion submodules introduced above, and each output end of the first splitter is connected to a photoelectric conversion submodule among the multiple optoelectronic conversion submodules according to the corresponding uplink wavelength, that is, the uplink wavelength corresponding to each output end is the same as the uplink wavelength corresponding to the connected optoelectronic conversion submodule. The multiple output ends of the first splitter output the optical signals of the corresponding uplink wavelengths to the connected optoelectronic conversion submodules respectively.

[0316] After receiving the optical signal of the uplink wavelength corresponding to the optoelectronic conversion submodule, each optoelectronic conversion submodule converts the received optical signal into a first uplink electrical signal, and transmits the first uplink electrical signal to other modules of the routing and switching device, so that the routing and switching device can obtain corresponding uplink information from the first uplink electrical signal, or perform other processing on the first uplink electrical signal, such as transmitting the first uplink electrical signal to other network devices.

[0317] It should be noted that the embodiment of the present application does not limit the execution order of steps 701 to 708 and steps 801 to 806, and the process of transmitting uplink information and downlink information can occur simultaneously. Since the transmission medium of uplink information and downlink information is an optical signal, the speed of light is very fast, therefore, all the above steps will be completed almost instantly, and the efficiency of optical communication is very high.

[0318] To summarize, in an embodiment of the present application, in order to achieve mixed insertion of optical modules without affecting optical communication, improve the networking flexibility of optical communication, and reduce the difficulty of equipment management and maintenance, the intermediate device divides the second downstream optical signal with multiple downstream wavelengths into multiple ones, and obtains multiple third downstream optical signals each with multiple downstream wavelengths. A third downstream optical signal is transmitted to multiple access side optical modules through multiple ports. Even if multiple access side optical modules are mixed, optical signals of their corresponding downstream wavelengths can be obtained from the received downstream optical signals.

[0319] Fig. 9 It is a flowchart of another optical communication method provided by an embodiment of the present application. The method corresponds to the third specific implementation of the optical communication system. That is, the method is applied to an optical communication system, the optical communication system includes a routing switching device, the routing switching device is plugged with a central optical module or integrated with a central optical module, the optical communication system also includes an intermediate device and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the routing switching device also includes a transceiver matching module, the central optical module includes a first splitter and multiple optoelectronic conversion submodules, the first splitter is connected to the multiple optoelectronic conversion submodules respectively through optical fibers, the optoelectronic conversion submodule corresponds to an uplink wavelength and a downlink wavelength with a matching relationship, different optoelectronic conversion submodules correspond to different uplink wavelengths and corresponding downlink wavelengths are also different, the intermediate device includes a first optical coupler and multiple ports, the first optical coupler is connected to the multiple ports respectively through optical fibers, each access side optical module is connected to any one port of the intermediate device through optical fibers, different access side optical modules are connected to different ports, each port of the intermediate device corresponds to a downlink wavelength, and different ports correspond to different downlink wavelengths, each access side optical module corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths. In addition, the access side optical module is inserted into the access device, or the access side optical module is integrated into the access device, and the access device is used to access the optical communication system through the access side optical module. Fig. 9 , the method comprises the following steps.

[0320] Step 901: Each optoelectronic conversion submodule in the central optical module obtains a first downstream electrical signal transmitted by the routing switching device, converts the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmits the optical signal of the downstream wavelength to the intermediate device.

[0321] The way in which the photoelectric conversion submodule acquires and converts the first downlink electrical signal is the same as that described above. Figures 2 to 8 The manner in which the photoelectric conversion submodule in the embodiment obtains the first downlink electrical signal is similar and will not be described in detail here.

[0322] In an embodiment of the present application, the central optical module also includes a first combiner, and the first combiner is connected to multiple optoelectronic conversion sub-modules through optical fibers, and each optoelectronic conversion sub-module transmits the optical signal of the downstream wavelength to the first combiner after obtaining the optical signal of the downstream wavelength corresponding to the optoelectronic conversion sub-module. The first combiner combines the optical signals of multiple downstream wavelengths transmitted by multiple optoelectronic conversion sub-modules into a first downstream optical signal, and transmits the first downstream optical signal to the intermediate device. Please refer to the relevant introduction in the above embodiment for the specific function, structure and implementation of the first combiner, which will not be repeated here.

[0323] In one implementation, the intermediate device further includes a first beam splitter and a second wave splitter, the central optical module further includes a second beam splitter, the first beam splitter is connected to the second wave splitter, the first optical coupler and the second beam splitter respectively through optical fibers, and the second beam splitter is also connected to the first combiner and the first wave splitter respectively through optical fibers. The first wave combiner transmits the first downstream optical signal to the second beam splitter, the second beam splitter obtains the first downstream optical signal transmitted by the first wave combiner, transmits the first downstream optical signal to the first beam splitter, the first beam splitter receives the second downstream optical signal, and transmits the second downstream optical signal to the second wave splitter. In this implementation, communication between the intermediate device and the central optical module can be achieved by connecting an optical cable.

[0324] The second downlink optical signal is an optical signal of the first downlink optical signal transmitted through the optical fiber between the central optical module and the intermediate device.

[0325] In another implementation, the intermediate device further includes a second splitter, and the first combiner of the central optical module is connected to the second splitter of the intermediate device through an optical fiber. The first combiner transmits the first downlink optical signal to the second splitter. In this implementation, communication between the intermediate device and the central optical module can be achieved by connecting two optical cables.

[0326] Step 902: The intermediate device obtains optical signals of multiple downstream wavelengths, and transmits an optical signal of a downstream wavelength corresponding to each port to an access-side optical module connected to the port through each of the multiple ports, wherein the multiple downstream wavelengths include a downstream wavelength corresponding to at least one port.

[0327] Among them, the intermediate device includes a second wave splitter, and the second wave splitter is connected to the multiple ports through optical fibers. The second wave splitter receives the first downstream optical signal transmitted by the central optical module, obtains the second downstream optical signal, decomposes the second downstream optical signal into the above-mentioned multiple downstream wavelength optical signals, and transmits the downstream wavelength optical signal corresponding to each port to the multiple ports of the intermediate device. For the specific function, structure and implementation method of the first combiner, please refer to the relevant introduction in the above embodiment, which will not be repeated here.

[0328] Step 903: The access side optical module receives an optical signal of a downstream wavelength transmitted by the connected port, and transmits an optical signal of an upstream wavelength corresponding to the access side optical module to the connected port. Among the multiple access side optical modules, there are at least two access side optical modules whose downstream wavelengths of optical signals received do not match the upstream wavelengths of optical signals sent.

[0329] Taking the first optical module among multiple access side optical modules as an example, the first optical module receives an optical signal of a first downstream wavelength transmitted by the first port, and transmits an optical signal of a first upstream wavelength to the first port. The first downstream wavelength does not match the first upstream wavelength. The first optical module is any one of the above-mentioned multiple access side optical modules, and the first port is a port to which the first optical module is connected among the multiple ports of the intermediate device.

[0330] For example, Figure 5 and Figure 6 As shown, the above-mentioned multiple uplink wavelengths include λ1, λ2 and λ3, and the three downlink wavelengths that match the three uplink wavelengths are λ1', λ2' and λ3' respectively. The optical communication system includes three access side optical modules, namely access side optical module 1, access side optical module 2 and access side optical module 3. The downlink wavelength of the optical signal received by access side optical module 1 and the uplink wavelength of the optical signal sent are λ1' and λ2 respectively, the downlink wavelength of the optical signal received by access side optical module 2 and the uplink wavelength of the optical signal sent are λ2' and λ1 respectively, and the downlink wavelength of the optical signal received by access side optical module 3 and the uplink wavelength of the optical signal sent are λ3' and λ3 respectively. It can be seen that the receiving and transmitting wavelengths of access side optical module 1 and access side optical module 2 do not match each other.

[0331] It should be understood that the transmission process of the uplink optical signal and the downlink optical signal are independent of each other and can be performed in parallel. For example, in a wavelength division system, the uplink optical signal and the downlink optical signal are transmitted simultaneously and can be distinguished by the uplink and downlink wavelengths. The uplink wavelength is different from the downlink wavelength, for example, the uplink wavelength is greater than a first threshold, and the downlink wavelength is less than the first threshold.

[0332] Step 904: The intermediate device receives optical signals of multiple upstream wavelengths through multiple ports, couples the optical signals of multiple upstream wavelengths into a first upstream optical signal through a first optical coupler, and transmits the first upstream optical signal to the central optical module, where the multiple upstream wavelengths include at least one upstream wavelength corresponding to an access side optical module.

[0333] The intermediate device includes a first optical coupler, which is connected to multiple ports of the intermediate device through optical fibers. The first optical coupler obtains multiple upstream wavelength optical signals transmitted by multiple ports, and couples the multiple upstream wavelength optical signals into a first upstream optical signal by energy merging. For the specific function, structure and implementation of the first optical coupler, please refer to the relevant introduction in the above embodiment, which will not be repeated here.

[0334] In an implementation in which the intermediate device further includes a first optical splitter, the first optical splitter is further connected to the first optical coupler via an optical fiber, and the first optical coupler transmits a first uplink optical signal to the first optical splitter. The first optical splitter obtains the first uplink optical signal transmitted by the first optical coupler, and transmits the first uplink optical signal to a second optical splitter included in the central optical module.

[0335] In the implementation mode in which the second splitter of the intermediate device is connected to the first combiner of the central optical module via optical fiber, the first optical coupler of the intermediate device is also connected to the first splitter of the central optical module via optical fiber, and the first optical coupler transmits the first uplink optical signal to the first splitter.

[0336] Step 905: The first demultiplexer of the central optical module receives the second uplink optical signal, decomposes the second uplink optical signal into optical signals of multiple uplink wavelengths, and transmits the optical signals of the uplink wavelengths corresponding to each of the optical-electrical conversion submodules to the multiple optical-electrical conversion submodules.

[0337] The second uplink optical signal is an optical signal after the first uplink optical signal is transmitted through the optical fiber between the intermediate device and the central optical module. The first splitter decomposes the second uplink optical signal into optical signals of multiple uplink wavelengths according to the wavelength. The specific function, structure and implementation of the first splitter refer to the relevant introduction in the above embodiment, which will not be repeated here.

[0338] Step 906: Each optoelectronic conversion submodule converts the optical signal of the upstream wavelength corresponding to the optoelectronic conversion submodule into a first upstream electrical signal, and transmits the first upstream electrical signal to the transceiver matching module of the routing switching device.

[0339] Since the downlink wavelength of the optical signal received by at least two access side optical modules among the multiple access side optical modules does not match the uplink wavelength of the optical signal sent, the uplink optical signal and the downlink optical signal transmitted by at least two optoelectronic conversion submodules among the multiple optoelectronic conversion submodules are not optical signals of the same access side optical module. In simple terms, there is a mismatch between the transceiver of at least two optoelectronic modules among the multiple optoelectronic conversion submodules, so this solution can perform transceiver matching through the transceiver matching module.

[0340] like Figure 5 and Figure 6 As shown, the first optoelectronic conversion submodule includes LD1 and PD1, the downlink optical signal transmitted by LD1 is about the access side optical module 1, and the uplink optical signal transmitted by PD1 is about the access side optical module 2, and the first optoelectronic conversion submodule does not match the transmission and reception. The second optoelectronic conversion submodule includes LD2 and PD2, the downlink optical signal transmitted by LD2 is about the access side optical module 2, and the uplink optical signal transmitted by PD2 is about the access side optical module 1, and the second optoelectronic conversion submodule does not match the transmission and reception.

[0341] Step 907: The transceiver matching module matches the multiple first downstream electrical signals transmitted by the multiple optoelectronic conversion submodules with the multiple first upstream electrical signals to determine the upstream wavelength optical signal sent and the downstream wavelength optical signal received by the same access side optical module.

[0342] The transceiver matching module may be a module in a chip included in the routing switch device, or other modules in the routing switch device, which is not limited in the embodiment of the present application. The chip may be referred to as an upper chip of the central optical module.

[0343] Since the transceiver matching module receives an electrical signal, the transceiver matching module matches the multiple first downlink electrical signals with the multiple first uplink electrical signals to determine the optical signal of the uplink wavelength sent by the same access side optical module and the optical signal of the downlink wavelength received. The multiple first downlink electrical signals include the first downlink electrical signals transmitted by the multiple optoelectronic conversion submodules, and the multiple first uplink electrical signals are also the first uplink electrical signals transmitted by the multiple optoelectronic conversion submodules.

[0344] There are many ways to implement transceiver matching by the transceiver matching module, which is not limited in this application. For example, the transceiver matching module uses information carried in the first downlink electrical signal and the first uplink electrical signal to perform transceiver matching, which may include source address, destination address or other information.

[0345] It should be noted that the embodiment of the present application does not limit the execution order of step 901 to step 907, and the process of transmitting uplink information and downlink information can occur simultaneously. Since the transmission medium of uplink information and downlink information is an optical signal, the speed of light is very fast, therefore, all the above steps will be completed almost instantly, and the efficiency of optical communication is very high.

[0346] To summarize, in the embodiments of the present application, even if multiple access side optical modules are mixed, the uplink wavelength of the optical signal transmitted by each access side optical module to the intermediate device may not match the downlink wavelength of the received optical signal, but the intermediate device can still couple the optical signals of multiple uplink wavelengths received by multiple ports through an optical coupler and transmit them to the central optical module. Although this may cause the optical signal sent and the received optical signal of one or some optoelectronic conversion sub-modules of the central optical module to not be the optical signal of the same access side optical module, that is, there is a mismatch between transmission and reception among multiple optoelectronic conversion sub-modules, the routing switching device can use the transceiver matching module to determine the optical signals sent and received by the same access side optical module, that is, perform transceiver matching, thereby ensuring the reliability of optical communication.

[0347] The embodiment of the present application also provides an access side light module, which can be implemented by software, hardware or a combination of the two. The access side light module can be Figures 1 to 9 Any access side optical module in the embodiment.

[0348] That is, the embodiment of the present application further provides a first optical module, the first optical module is any one of the multiple access side optical modules included in the optical communication system, the optical communication system also includes an intermediate device, the intermediate device includes multiple ports, each access side optical module is connected to any one of the multiple ports through an optical fiber, different access side optical modules are connected to different ports, wherein the first optical module is connected to the first port of the multiple ports through an optical fiber, each access side optical module corresponds to a downlink wavelength, different access side optical modules correspond to different downlink wavelengths, wherein the first optical module corresponds to a first downlink wavelength; the first optical module is used for:

[0349] Receiving a downlink optical signal transmitted by the first port, the downlink optical signal having a plurality of downlink wavelengths, the plurality of downlink wavelengths including at least one downlink wavelength corresponding to an access-side optical module;

[0350] An optical signal of a first downstream wavelength is obtained from the downstream optical signal.

[0351] Optionally, the first optical module includes a first filter;

[0352] The first filter is used to filter the downlink optical signal to obtain an optical signal of a first downlink wavelength.

[0353] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths, wherein the first optical module further corresponds to the first uplink wavelength; the first optical module is further used for:

[0354] generating an optical signal of a first upstream wavelength;

[0355] An optical signal of a first upstream wavelength is transmitted to the first port.

[0356] Optionally, the first optical module further includes a first laser, and the first laser is connected to the first port via an optical fiber;

[0357] The first laser is used to generate an optical signal of a first upstream wavelength.

[0358] Optionally, the first optical module includes a first beam splitter and a second filter, and the first beam splitter is connected to the first port and the second filter respectively through optical fibers;

[0359] A first optical splitter, used for receiving a downlink optical signal transmitted by the first port;

[0360] A first beam splitter, used for transmitting a downlink optical signal to a second filter;

[0361] The second filter is used to demultiplex the downlink optical signal to obtain an optical signal of a first downlink wavelength.

[0362] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths, wherein the first optical module further corresponds to the first uplink wavelength, and the first optical module further includes a second laser, and the second laser is connected to the first beam splitter;

[0363] A second laser is used to generate an optical signal of a first upstream wavelength and transmit the optical signal of the first upstream wavelength to the first beam splitter;

[0364] The first beam splitter is used to transmit an optical signal of a first upstream wavelength to the first port.

[0365] Optionally, the first optical module is inserted into an access device, or the first optical module is integrated into an access device, and the access device is used to access the optical communication system through the first optical module.

[0366] In an embodiment of the present application, in order to achieve mixed insertion of optical modules without affecting optical communication, improve the networking flexibility of optical communication, and reduce the difficulty of equipment management and maintenance, the intermediate device divides a downstream optical signal with multiple downstream wavelengths into multiple ones, and obtains multiple downstream optical signals each with multiple downstream wavelengths. One downstream optical signal is transmitted to multiple access side optical modules through multiple ports. Even if multiple access side optical modules are mixed, they can obtain optical signals of their corresponding downstream wavelengths from the received downstream optical signals.

[0367] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figures 1 to 4 The system embodiment shown and Figures 7 and 8 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0368] The embodiment of the present application also provides an intermediate device, which can be implemented by software, hardware or a combination of both. Figures 1 to 9 Any intermediate device in an embodiment.

[0369] That is, an embodiment of the present application further provides an intermediate device, which is included in an optical communication system, the optical communication system also includes a central optical module and a plurality of access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the intermediate device includes a plurality of ports, each access side optical module is connected to any one of the plurality of ports through an optical fiber, different access side optical modules are connected to different ports, and the access side optical modules correspond to downstream wavelengths, and different access side optical modules correspond to different downstream wavelengths; the intermediate device is used for:

[0370] receiving a first downstream optical signal transmitted by a central optical module to obtain a second downstream optical signal, wherein the first downstream optical signal has a plurality of downstream wavelengths, the plurality of downstream wavelengths including at least one downstream wavelength corresponding to an access-side optical module, and the second downstream optical signal is an optical signal obtained by transmitting the first downstream optical signal through an optical fiber between the central optical module and an intermediate device;

[0371] dividing the second downstream optical signal into a plurality of third downstream optical signals, each of the plurality of third downstream optical signals having the plurality of downstream wavelengths;

[0372] A third downstream optical signal is transmitted to the access side optical module connected to the port through each port of the multiple ports, and the third downstream optical signal is used for the access side optical module to obtain an optical signal of a corresponding downstream wavelength.

[0373] Optionally, the intermediate device further includes a first optical splitter, and the first optical splitter is connected to the multiple ports respectively through optical fibers;

[0374] The first optical splitter is used to split the second downstream optical signal into the plurality of third downstream optical signals by energy splitting.

[0375] Optionally, the intermediate device further includes a first beam splitter, the central optical module includes a second beam splitter, and the first beam splitter is connected to the second beam splitter and the first beam splitter respectively through optical fibers;

[0376] The first beam splitter is used to receive the first downstream optical signal transmitted by the second beam splitter to obtain a second downstream optical signal.

[0377] Optionally, the central optical module includes a first combiner, and the first combiner is connected to the first optical splitter through an optical fiber;

[0378] The first optical splitter is further used to receive the first downstream optical signal transmitted by the first combiner to obtain a second downstream optical signal.

[0379] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths; the intermediate device is further used for:

[0380] Receiving optical signals of multiple upstream wavelengths through the multiple ports, the multiple upstream wavelengths including at least one upstream wavelength corresponding to an access-side optical module;

[0381] Combining the optical signals of the multiple upstream wavelengths into a first upstream optical signal;

[0382] Transmit a first uplink optical signal to the central optical module.

[0383] Optionally, the intermediate device further includes a first optical coupler, and the first optical coupler is connected to the plurality of ports respectively through optical fibers;

[0384] The first optical coupler is used to combine the optical signals of the multiple uplink wavelengths into a first uplink optical signal by energy combination.

[0385] Optionally, the intermediate device further includes a first beam splitter, the central optical module further includes a second beam splitter, and the first beam splitter is connected to the second beam splitter and the first optical coupler respectively through optical fibers;

[0386] The first optical coupler is further used to transmit the first uplink optical signal to the first optical splitter;

[0387] The first beam splitter is used to transmit a first uplink optical signal to the second beam splitter.

[0388] Optionally, the first optical splitter is also connected to the central optical module via an optical fiber;

[0389] The first optical splitter is also used to receive the first downstream optical signal transmitted by the central optical module to obtain the second downstream optical signal.

[0390] Optionally, each access side optical module further corresponds to an uplink wavelength, and different access side optical modules correspond to different uplink wavelengths;

[0391] The first optical splitter is further used to obtain optical signals of multiple upstream wavelengths transmitted by the multiple ports, wherein the multiple upstream wavelengths include at least one upstream wavelength corresponding to an access-side optical module;

[0392] The first optical splitter is further used to couple the optical signals of multiple upstream wavelengths transmitted by the multiple ports into a first upstream optical signal by energy combination, and transmit the first upstream optical signal to the central optical module.

[0393] In an embodiment of the present application, in order to achieve mixed insertion of optical modules without affecting optical communication, improve the networking flexibility of optical communication, and reduce the difficulty of equipment management and maintenance, the intermediate device divides the first downstream optical signal with multiple downstream wavelengths into multiple ones, and obtains multiple third downstream optical signals each with multiple downstream wavelengths. A third downstream optical signal is transmitted to multiple access side optical modules through multiple ports. Even if multiple access side optical modules are mixed, they can obtain optical signals of their corresponding downstream wavelengths from the received fourth downstream optical signal.

[0394] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figures 1 to 4 The system embodiment shown and Figures 7 and 8 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0395] The embodiment of the present application also provides a central optical module, which can be implemented by software, hardware or a combination of the two. Figures 1 to 9 Any central optical module in the embodiments.

[0396] That is, a central optical module is provided, which is included in an optical communication system. The optical communication system also includes an intermediate device and a plurality of access side optical modules. The central optical module is connected to the intermediate device through an optical fiber. The intermediate device includes a plurality of ports. Each access side optical module is connected to any one of the plurality of ports through an optical fiber. Different access side optical modules are connected to different ports. Each access side optical module corresponds to a downstream wavelength, and different access side optical modules correspond to different downstream wavelengths. The central optical module is used for:

[0397] Generate optical signals of multiple downstream wavelengths, the multiple downstream wavelengths including at least one downstream wavelength corresponding to an access-side optical module;

[0398] Combining the optical signals of the multiple downstream wavelengths into a first downstream optical signal, where the first downstream optical signal has the multiple downstream wavelengths;

[0399] A first downstream optical signal is transmitted to an intermediate device, and the first downstream optical signal is used by the intermediate device to divide the received second downstream optical signal into multiple third downstream optical signals, and transmit a third downstream optical signal to the access side optical module connected to the port through each port of the multiple ports, so that each access side optical module obtains an optical signal of a downstream wavelength corresponding to the access side optical module from the received fourth downstream optical signal. The second downstream optical signal is an optical signal after the first downstream optical signal is transmitted via the optical fiber between the central optical module and the intermediate device, and the fourth downstream optical signal is an optical signal after the third downstream optical signal is transmitted via the optical fiber between the access side optical module and the port of the intermediate device.

[0400] Optionally, the central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to access the optical communication system through the central optical module.

[0401] In an embodiment of the present application, in order to achieve mixed insertion of optical modules without affecting optical communication, improve the networking flexibility of optical communication, and reduce the difficulty of equipment management and maintenance, the intermediate device divides the second downstream optical signal with multiple downstream wavelengths into multiple ones, and obtains multiple third downstream optical signals each with multiple downstream wavelengths. A third downstream optical signal is transmitted to multiple access side optical modules through multiple ports. Even if multiple access side optical modules are mixed, they can obtain optical signals of their corresponding downstream wavelengths from the received fourth downstream optical signal.

[0402] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figures 1 to 4 The system embodiment shown and Figures 7 and 8 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0403] The embodiment of the present application also provides an access side light module, which can be implemented by software, hardware or a combination of the two. The access side light module can be Figures 1 to 9 Any access side optical module in the embodiment.

[0404] That is, a first optical module is provided, the first optical module is any one of the multiple access side optical modules included in the optical communication system, the optical communication system also includes an intermediate device and a routing switching device, the routing switching device is connected to the intermediate device through an optical fiber, the intermediate device includes a plurality of ports, the first optical module is connected to a first port of the plurality of ports through an optical fiber, the first port is any one of the plurality of ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, the first port corresponds to a first downstream wavelength, the downstream wavelength is also matched with an upstream wavelength, different downstream wavelengths match different upstream wavelengths, the first optical module corresponds to a first upstream wavelength, and the first upstream wavelength does not match the first downstream wavelength; the first optical module is used for:

[0405] receiving an optical signal of a first downstream wavelength transmitted by a first port;

[0406] The first upstream wavelength optical signal is transmitted to the first port, so as to transmit the first upstream wavelength optical signal to the routing switching device through the intermediate device, and the routing switching device is used to match the downstream wavelength optical signal received by the same access side optical module with the upstream wavelength optical signal sent.

[0407] In an embodiment of the present application, even if multiple access side optical modules are mixed, the uplink wavelength of the optical signal transmitted by each access side optical module to the intermediate device may not match the downlink wavelength of the received optical signal, but the intermediate device can still couple the optical signals of multiple uplink wavelengths received by multiple ports through an optical coupler and transmit them to the central optical module. Although this may cause the optical signal sent and the received optical signal of one or some optoelectronic conversion sub-modules of the central optical module to not be the optical signal of the same access side optical module, that is, there is a mismatch between transmission and reception among multiple optoelectronic conversion sub-modules, the routing switching device can use the transceiver matching module to determine the optical signals sent and received by the same access side optical module, that is, perform transceiver matching, thereby ensuring the reliability of optical communication.

[0408] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figure 1 , Figure 5 , Figure 6 , Fig. 9 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0409] The embodiment of the present application also provides an intermediate device, which can be implemented by software, hardware or a combination of both. Figures 1 to 9 Any intermediate device in an embodiment.

[0410] That is, an intermediate device is provided, which is included in an optical communication system. The optical communication system also includes a routing switching device and a plurality of access side optical modules. The routing switching device is connected to the intermediate device through an optical fiber. The intermediate device includes a first optical coupler and a plurality of ports. The first optical coupler is connected to the plurality of ports through optical fibers respectively. Each of the plurality of access side optical modules is connected to any one of the plurality of ports through optical fibers. Different access side optical modules are connected to different ports. Each port corresponds to a downstream wavelength. Different ports correspond to different downstream wavelengths. Each downstream wavelength is also matched with an upstream wavelength. Different downstream wavelengths match different upstream wavelengths. Each access side optical module corresponds to an upstream wavelength. Different access side optical modules correspond to different upstream wavelengths. The intermediate device is used for:

[0411] Acquire optical signals of multiple downstream wavelengths transmitted by a routing switching device, wherein the multiple downstream wavelengths include a downstream wavelength corresponding to at least one port;

[0412] Transmitting an optical signal of a downstream wavelength corresponding to the port to an access-side optical module connected to the port through each of the multiple ports, and receiving an optical signal of an upstream wavelength transmitted by the access-side optical module through the multiple ports, wherein the downstream wavelength of the optical signal sent by the same port among the multiple ports does not match the upstream wavelength of the optical signal received;

[0413] coupling the optical signals of the multiple upstream wavelengths received through the multiple ports into a first upstream optical signal through a first optical coupler;

[0414] The first uplink optical signal is transmitted to the routing switching device, and the routing switching device is used to determine the uplink wavelength optical signal sent and the downlink wavelength optical signal received by the same access side optical module by matching multiple uplink wavelength optical signals with multiple downlink wavelength optical signals.

[0415] In an embodiment of the present application, even if multiple access side optical modules are mixed, the uplink wavelength of the optical signal transmitted by each access side optical module to the intermediate device may not match the downlink wavelength of the received optical signal, but the intermediate device can still couple the optical signals of multiple uplink wavelengths received by multiple ports through an optical coupler and transmit them to the central optical module. Although this may cause the optical signal sent and the received optical signal of one or some optoelectronic conversion sub-modules of the central optical module to not be the optical signal of the same access side optical module, that is, there is a mismatch between transmission and reception among multiple optoelectronic conversion sub-modules, the routing switching device can use the transceiver matching module to determine the optical signals sent and received by the same access side optical module, that is, perform transceiver matching, thereby ensuring the reliability of optical communication.

[0416] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figure 1 , Figure 5 , Figure 6 , Fig. 9 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0417] The embodiment of the present application also provides a routing switching device, which can be implemented by software, hardware or a combination of the two. Figures 1 to 9 Any routing switching device in the embodiments.

[0418] That is, a routing switching device is provided, the routing switching device is included in an optical communication system, the routing switching device is inserted with a central optical module or integrated with the central optical module, the optical communication system also includes an intermediate device and multiple access side optical modules, the central optical module is connected to the intermediate device through an optical fiber, the routing switching device also includes a transceiver matching module, the central optical module includes a first splitter and multiple optoelectronic conversion submodules, the first splitter is connected to the multiple optoelectronic conversion submodules through optical fibers respectively, each optoelectronic conversion submodule corresponds to an upstream wavelength and a downstream wavelength with a matching relationship, different optoelectronic conversion submodules correspond to different upstream wavelengths and corresponding downstream wavelengths are also different, the intermediate device includes multiple ports, each access side optical module is connected to any one of the multiple ports through an optical fiber, different access side optical modules are connected to different ports, each port corresponds to a downstream wavelength, different ports correspond to different downstream wavelengths, each access side optical module corresponds to an upstream wavelength, and different access side optical modules correspond to different upstream wavelengths;

[0419] Each of the multiple optoelectronic conversion submodules is used to obtain a first downstream electrical signal transmitted by the routing switching device, convert the obtained first downstream electrical signal into an optical signal of a downstream wavelength corresponding to the optoelectronic conversion submodule, and transmit the optical signal of the downstream wavelength to the intermediate device;

[0420] Each optoelectronic conversion submodule is further used to receive an optical signal of an uplink wavelength corresponding to the optoelectronic conversion submodule transmitted by an intermediate device, convert the received optical signal of the uplink wavelength into a first uplink electrical signal, and transmit the first uplink electrical signal to the transceiver matching module;

[0421] The transceiver matching module is used to match the multiple first downlink electrical signals transmitted by the multiple optoelectronic conversion submodules with the multiple first uplink electrical signals to determine the uplink wavelength optical signal sent and the downlink wavelength optical signal received by the same access side optical module.

[0422] In an embodiment of the present application, even if multiple access side optical modules are mixed, the uplink wavelength of the optical signal transmitted by each access side optical module to the intermediate device may not match the downlink wavelength of the received optical signal, but the intermediate device can still couple the optical signals of multiple uplink wavelengths received by multiple ports through an optical coupler and transmit them to the central optical module. Although this may cause the optical signal sent and the received optical signal of one or some optoelectronic conversion sub-modules of the central optical module to not be the optical signal of the same access side optical module, that is, there is a mismatch between transmission and reception among multiple optoelectronic conversion sub-modules, the routing switching device can use the transceiver matching module to determine the optical signals sent and received by the same access side optical module, that is, perform transceiver matching, thereby ensuring the reliability of optical communication.

[0423] It should be noted that: the access side optical module provided in the above embodiment is only illustrated by the division of the above functional modules when performing optical communication. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Figure 1 , Figure 5 , Figure 6 , Fig. 9 The method embodiments shown belong to the same concept, and their specific implementation processes are detailed in the method embodiments, which will not be repeated here.

[0424] Fig.101 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, and the communication device may be an access device or a routing switching device in any of the above embodiments. The communication device 1000 may be a switch, a router or other communication device for forwarding messages. In this embodiment, the communication device 1000 includes: a main control board 1010, an interface board 1030 and an interface board 1040. In the case of multiple interface boards, a switching network board (not shown in the figure) may be included, and the switching network board is used to complete data exchange between each interface board (the interface board is also called a line card or a service board).

[0425] The main control board 1010 is used to complete functions such as system management, equipment maintenance, and protocol processing. The interface boards 1030 and 1040 are used to provide various service interfaces (for example, POS interface, GE interface, ATM interface, etc.) and realize data flow forwarding. The main control board 1010 mainly includes three types of functional units: system management control unit, system clock unit, and system maintenance unit. The main control board 1010, the interface board 1030, and the interface board 1040 are connected to the system backplane through the system bus to achieve intercommunication. The interface board 1030 includes one or more processors 1031. The processor 1031 is used to control and manage the interface board and communicate with the central processor on the main control board, as well as to forward data flow. The memory 1032 on the interface board 1030 is used to store forwarding table entries, and the processor 1031 forwards the data flow by searching the forwarding table entries stored in the memory 1032.

[0426] The interface board 1030 includes one or more communication interfaces (such as network interfaces) 1033 for receiving data streams or other information sent by a terminal or other network device, and processing these data streams or data according to the instructions of the processor 1031. The specific implementation process will not be described one by one here.

[0427] It is understandable that Fig.10 As shown, the embodiment of the present application includes multiple interface boards, and adopts a distributed forwarding mechanism. Under this mechanism, the operation on the interface board 1040 is basically similar to the operation on the interface board 1030, and for the sake of brevity, it will not be repeated. In addition, it can be understood that Fig.10 The processor 1031 and / or 1041 in the interface board 1030 can be a dedicated hardware or chip, such as a network processor or an application specific integrated circuit (application specific integrated circuit) to implement the above functions. This implementation method is generally referred to as the forwarding plane using dedicated hardware or chip processing. The specific implementation method using the dedicated hardware or chip of the network processor can be referred to below Fig.11In another embodiment, the processor 1031 and / or 1041 may also be a general-purpose processor, such as a general-purpose CPU, to implement the functions described above.

[0428] In addition, it should be noted that there may be one or more main control boards, and when there are multiple boards, they may include a main main control board and a standby main control board. There may be one or more interface boards. The stronger the data processing capability of the device, the more interface boards are provided. In the case of multiple interface boards, the multiple interface boards can communicate with each other through one or more switching network boards, and when there are multiple boards, they can jointly realize load sharing and redundant backup. Under the centralized forwarding architecture, the device may not need a switching network board, and the interface board is responsible for the processing function of the service data of the entire system. Under the distributed forwarding architecture, the device includes multiple interface boards, and data exchange between multiple interface boards can be realized through the switching network board, providing large-capacity data exchange and processing capabilities. Therefore, the data access and processing capabilities of the communication equipment of the distributed architecture are greater than those of the equipment of the centralized architecture. Which architecture to adopt depends on the specific networking deployment scenario, and no limitation is made here.

[0429] In some embodiments, the memory 1032 may be a read-only memory (ROM), a random access memory (RAM), an electrically erasable programmable read-only memory (EEPROM), an optical disk including (compact disc read-only memory (CD-ROM), a compressed optical disk, a laser disk, a digital versatile disk, a Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 1032 may exist independently and be connected to the processor 1031 via a communication bus. The memory 1032 may also be integrated with the processor 1031.

[0430] In some embodiments, the communication interface 1033 may be a device using any transceiver type for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. The communication interface 1033 includes a wired communication interface and may also include a wireless communication interface. Among them, the wired communication interface may be, for example, an Ethernet interface. The Ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface may be a WLAN interface, a cellular network communication interface, or a combination thereof. When the communication device is used as any communication device in the domain, the communication interface 1033 is used to forward data messages to other communication devices.

[0431] In some embodiments, the communication device may include multiple processors, each of which may be a single-core processor or a multi-core processor. The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).

[0432] In some embodiments, the memory 1032 is used to store program codes for executing the solution of the present application, and the processor 1031 can execute the program codes stored in the memory 1032 to prompt the communication device 1000 to execute Figures 7 to 9 The processing steps of the access device or routing switching device in the embodiment shown in the figure can be specifically implemented by referring to Figures 7 to 9 The detailed description in the illustrated embodiment will not be repeated here.

[0433] Fig.11It is a structural diagram of another communication device provided in an embodiment of the present application, and the communication device can be an access device or a routing switching device in any of the above embodiments. In this embodiment, the communication device 1100 includes: a main control board 1110, an interface board 1130, a switching network board 1120 and an interface board 1140. The main control board 1110 is used to complete functions such as system management, equipment maintenance, and protocol processing. The switching network board 1120 is used to complete data exchange between various interface boards (interface boards are also called line cards or service boards). Interface boards 1130 and 1140 are used to provide various service interfaces (for example, POS interfaces, GE interfaces, ATM interfaces, etc.) and realize data packet forwarding. The control plane is composed of various control units of the main control board 1110 and control units on the interface boards 1130 and 1140. There are mainly three types of functional units on the main control board 1110: a system management control unit, a system clock unit, and a system maintenance unit. The main control board 1110, the interface boards 1130 and 1140, and the switching network board 1120 are connected to the system backplane through the system bus to achieve intercommunication. The central processor 1131 on the interface board 1130 is used to control and manage the interface board and communicate with the central processor on the main control board. The forwarding table entry memory 1134 on the interface board 1130 is used to store the forwarding table entry, and the network processor 1132 forwards the data stream by searching the forwarding table entry stored in the forwarding table entry memory 1134.

[0434] The physical interface card 1133 of the interface board 1130 is used to receive data streams or other data sent by a terminal or other device. The specific implementation process will not be described one by one here.

[0435] The network processor 1132 is used to process the received data stream, etc. The specific functions of the network processor 1132 are not described in detail here. For example, the network processor 1132 can execute program code to prompt the communication device 1100 to execute Figures 7 to 9 The processing steps of the access device or routing switching device in the embodiment shown in the figure can be specifically implemented by referring to Figures 7 to 9 The detailed description in the embodiments will not be repeated here.

[0436] It is understandable that Fig.11 As shown, the embodiment of the present application includes multiple interface boards, and adopts a distributed forwarding mechanism. Under this mechanism, the operation on the interface board 1140 is basically similar to the operation on the interface board 1130, and for the sake of brevity, it will not be repeated. In addition, as mentioned above, Fig.11 The functions of the network processors 1132 and 1142 may be replaced by application specific integrated circuits (ASICs).

[0437] In addition, it should be noted that there may be one or more main control boards, and when there are multiple boards, they may include a main main control board and a standby main control board. There may be one or more interface boards. The stronger the data processing capability of the device, the more interface boards are provided. There may also be one or more physical interface cards on the interface board. There may be no switching network board, or there may be one or more switching network boards. When there are multiple switching network boards, load sharing and redundant backup can be achieved together. In a centralized forwarding architecture, the device may not need a switching network board, and the interface board is responsible for the processing function of the service data of the entire system. In a distributed forwarding architecture, the device may have at least one switching network board, and data exchange between multiple interface boards is realized through the switching network board, providing large-capacity data exchange and processing capabilities. Therefore, the data access and processing capabilities of the communication equipment with a distributed architecture are greater than those of the equipment with a centralized architecture. Which architecture to adopt depends on the specific networking deployment scenario, and no limitation is made here.

[0438] Please refer to Fig.12 , Fig.12 is a schematic diagram of a communication device according to an embodiment of the present application. Optionally, the communication device is Figures 1 to 9 The access device or routing switching device in the illustrated embodiment, the communication device includes one or more processors 1201 , a communication bus 1202 , a memory 1203 , and one or more communication interfaces 1204 .

[0439] Processor 1201 is a general-purpose central processing unit (CPU), a network processor (NP), a microprocessor, or one or more integrated circuits for implementing the solution of the present application, such as an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. Optionally, the above-mentioned PLD is a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof. When the communication device is any communication device in the embodiments of the present application, processor 1201 is used to implement Figures 2 to 10 Any of the embodiments shown provides an optical communication method.

[0440] The communication bus 1202 is used to transmit information between the above components. Optionally, the communication bus 1202 is divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0441] Optionally, the memory 1203 is a read-only memory (ROM), a random access memory (RAM), an electrically erasable programmable read-only memory (EEPROM), an optical disc (including a compact disc read-only memory (CD-ROM), a compressed optical disc, a laser disc, a digital versatile disc, a Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 1203 exists independently and is connected to the processor 1201 through the communication bus 1202, or the memory 1203 is integrated with the processor 1201.

[0442] The communication interface 1204 uses any transceiver-like device to communicate with other devices or communication networks. The communication interface 1204 includes a wired communication interface, and optionally, also includes a wireless communication interface. Among them, the wired communication interface is, for example, an Ethernet interface. Optionally, the Ethernet interface is an optical interface, an electrical interface, or a combination thereof. The wireless communication interface is a wireless local area network (WLAN) interface, a cellular network communication interface, or a combination thereof. When the communication device acts as any communication device in the domain, the communication interface 1204 is used to forward data messages to other communication devices. When the communication device acts as a head node in the domain, the communication interface 1204 can also be used to communicate with Figures 1 to 10 The controller communication in the illustrated embodiment, for example, receives global time slot scheduling parameters issued by the controller.

[0443] Optionally, in some embodiments, the communication device includes multiple processors, such as Fig.12 The processor 1201 and the processor 1205 shown in . Each of these processors is a single-core processor, or a multi-core processor. Optionally, the processor here refers to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).

[0444] In some embodiments, the communication device further includes an output device 1206 and an input device 1207. The output device 1206 communicates with the processor 1201 and can display information in a variety of ways. For example, the output device 1206 is a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. The input device 1207 communicates with the processor 1201 and can receive user input in a variety of ways. For example, the input device 1207 is a mouse, a keyboard, a touch screen device, or a sensor device.

[0445] In some embodiments, the memory 1203 is used to store the program code 1210 for executing the solution of the present application, and the processor 1201 can execute the program code 1210 stored in the memory 1203, so as to prompt the communication device to execute Figures 7 to 9 The processing steps of the access device or routing switching device in the embodiment shown in the figure can be specifically implemented by referring to Figures 7 to 9 The detailed description in the illustrated embodiment will not be repeated here.

[0446] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital versatile disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc. It is worth noting that the computer-readable storage medium mentioned in the embodiment of the present application may be a non-volatile storage medium, in other words, a non-transient storage medium.

[0447] It should be understood that the "at least one" mentioned herein refers to one or more, and "multiple" refers to two or more. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not limit them to be necessarily different.

[0448] It should be noted that the information (including but not limited to user equipment information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.) and signals involved in the embodiments of this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions. For example, the uplink information and downlink information involved in the embodiments of this application are obtained with full authorization.

[0449] The above-mentioned embodiments are provided for the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical communication system, characterized in that: The optical communication system includes a central optical module, an intermediate device and a plurality of access side optical modules, the intermediate device includes a plurality of ports, a first optical splitter and a first optical coupler, each port of the intermediate device is implemented by a pair of physical ports, the pair of physical ports includes an uplink port and a downlink port, the first optical splitter is respectively connected to the downlink port of each of the plurality of ports, and the first optical coupler is respectively connected to the uplink port of each of the plurality of ports; different access side optical modules among the plurality of access side optical modules are used to connect different ports of the intermediate device, and each access side optical module corresponds to a downlink wavelength and an uplink wavelength, different access side optical modules correspond to different downlink wavelengths, and different access side optical modules correspond to different uplink wavelengths; The central optical module is used to transmit a first downstream optical signal to the intermediate device through an optical fiber, wherein the first downstream optical signal has multiple downstream wavelengths; The first optical splitter is used to split the second downstream optical signal into a plurality of third downstream optical signals, and transmit a third downstream optical signal to a downstream port of each of the plurality of ports, each of the plurality of third downstream optical signals having the plurality of downstream wavelengths, and the second downstream optical signal is an optical signal of the first downstream optical signal after being transmitted through the optical fiber between the central optical module and the intermediate device; Each access side optical module of the multiple access side optical modules is used to receive a fourth downstream optical signal, and obtain an optical signal of a downstream wavelength corresponding to the access side optical module from the fourth downstream optical signal, wherein the fourth downstream optical signal is an optical signal after the third downstream optical signal is transmitted through the optical fiber between the access side optical module and the port of the intermediate device; Each access side optical module among the multiple access side optical modules is also used to transmit an optical signal of an upstream wavelength corresponding to the access side optical module to an upstream port among the ports of the intermediate device to which the access side optical module is connected; The first optical coupler is used to couple optical signals of multiple upstream wavelengths received by the upstream port of each port of the multiple ports into a first upstream optical signal; The central optical module is further used to receive a second uplink optical signal and decompose the second uplink optical signal into optical signals of the multiple uplink wavelengths, wherein the second uplink optical signal is an optical signal of the first uplink optical signal transmitted through the optical fiber between the intermediate device and the central optical module.

2. The system according to claim 1, characterized in that Each access side optical module of the plurality of access side optical modules comprises a photodiode PD, and each access side optical module further comprises a filter or a wavelength splitter; The multiple access-side optical modules include a first optical module, and the filter or the wavelength splitter in the first optical module is used to filter the fourth downstream optical signal received through the optical fiber between the first optical module and the port of the intermediate device, so as to obtain the optical signal of the downstream wavelength corresponding to the first optical module from the fourth downstream optical signal; The PD in the first optical module is used to perform photoelectric conversion on an optical signal of a downlink wavelength corresponding to the first optical module obtained by a filter or a wavelength splitter in the first optical module, so as to obtain a downlink electrical signal.

3. The system according to claim 1, characterized in that The multiple access-side optical modules include a first optical module, and the first optical module is used to connect to a downlink port in a first pair of physical ports of the intermediate device through a first optical fiber; The filter or the wavelength splitter in the first optical module is used to receive the fourth downlink optical signal transmitted through the first optical fiber.

4. The system according to claim 3, characterized in that Each access side optical module comprises a laser; The first optical module is also used to connect to the uplink port in the first pair of physical ports through a second optical fiber; The laser in the first optical module is used to generate an optical signal of a first upstream wavelength, and transmit the optical signal of the first upstream wavelength through the second optical fiber. The first upstream wavelength is an upstream wavelength corresponding to the first optical module.

5. The system according to claim 4, characterized in that The central optical module includes a combiner and a splitter; The combiner in the central optical module is used to obtain optical signals of multiple downstream wavelengths and combine the optical signals of the multiple downstream wavelengths into the first downstream optical signal. The wavelength splitter in the central optical module is used to decompose the second uplink optical signal into optical signals of the multiple uplink wavelengths.

6. The system according to claim 5, characterized in that The combiner in the central optical module is used to send the first downlink optical signal to the first optical splitter through a third optical fiber, and the splitter in the central optical module is used to receive the second uplink optical signal from the first optical coupler through a fourth optical fiber.

7. The system according to claim 5, characterized in that The intermediate device further includes a first beam splitter, the central optical module further includes a second beam splitter, and the first beam splitter and the second beam splitter are connected via a third optical fiber; The combiner is used to transmit the first downlink optical signal to the second optical splitter; The second optical splitter is used to transmit the first downlink optical signal to the first optical splitter through the third optical fiber; The first optical splitter is used to transmit the second downlink optical signal received through the third optical fiber to the first optical splitter; The first optical coupler is also used to transmit the first uplink optical signal to the first optical splitter; The first beam splitter is further used to transmit the first uplink optical signal to the second beam splitter through the third optical fiber; The second optical splitter is further used to transmit the second uplink optical signal received through the third optical fiber to the wavelength splitter in the central optical module.

8. The system according to any one of claims 1 to 7, characterized in that: The first optical splitter is used for dividing the second downstream optical signal into the plurality of third downstream optical signals by energy splitting.

9. The system according to any one of claims 1 to 7, characterized in that: The access side optical module is inserted into the access device, or the access side optical module is integrated into the access device, and the access device is used to access the optical communication system through the access side optical module; The central optical module is inserted into the routing switching device, or the central optical module is integrated into the routing switching device, and the routing switching device is used to communicate with the access device through the central optical module.

10. An optical communication method, characterized in that: An intermediate device applied to an optical communication system, the optical communication system further comprising a plurality of access side optical modules, the intermediate device comprising a plurality of ports, each of the plurality of ports being implemented by a pair of physical ports, the pair of physical ports comprising an uplink port and a downlink port, each of the plurality of access side optical modules being connected to any one of the plurality of ports via an optical fiber, different access side optical modules being connected to different ports, and each access side optical module corresponding to a downlink wavelength and an uplink wavelength, different access side optical modules corresponding to different downlink wavelengths, and different access side optical modules corresponding to different uplink wavelengths, the method comprising: receiving a second downstream optical signal through an optical fiber, wherein the second downstream optical signal has a plurality of downstream wavelengths, and the plurality of downstream wavelengths include at least one downstream wavelength corresponding to the access-side optical module; dividing the second downstream optical signal into a plurality of third downstream optical signals, each of the plurality of third downstream optical signals having the plurality of downstream wavelengths; Transmitting one of the plurality of third downstream optical signals to a downstream port among the plurality of ports respectively; Transmitting a third downlink optical signal to the access side optical module connected to the port through a downlink port among the multiple ports; Receiving optical signals of multiple upstream wavelengths through an upstream port among the multiple ports, wherein the multiple upstream wavelengths include at least one upstream wavelength corresponding to the access-side optical module; coupling the optical signals of the multiple upstream wavelengths into a first upstream optical signal; The first uplink optical signal is transmitted through an optical fiber.

11. The method according to claim 10, characterized in that The method of transmitting a third downlink optical signal to an access side optical module connected to the port through a downlink port among the multiple ports includes: The downlink port in each port transmits a third downlink optical signal to the access side optical module connected to the port through the downlink optical fiber connected to the downlink port.

12. The method according to claim 10, characterized in that The receiving optical signals of multiple upstream wavelengths through an upstream port among the multiple ports comprises: For each of the multiple ports, an optical signal of an upstream wavelength transmitted by an access-side optical module connected to the port is received through an upstream optical fiber connected to the upstream port in the port, thereby receiving optical signals of multiple upstream wavelengths.

13. The method according to claim 10, characterized in that The step of dividing the second downlink optical signal into a plurality of third downlink optical signals comprises: The second downstream optical signal is divided into the plurality of third downstream optical signals by energy splitting.

14. The method according to any one of claims 10 to 13, characterized in that: The second downlink optical signal comes from the central optical module and is received through the first optical fiber; The first uplink optical signal is transmitted to the central optical module through the second optical fiber.

15. The method according to any one of claims 10 to 13, characterized in that: The second downlink optical signal comes from the central optical module and is received through the first optical fiber; The first uplink optical signal is transmitted to the central optical module through the first optical fiber.

16. An intermediate device, characterized in that: The intermediate device is applied to an optical communication system, the optical communication system further includes a plurality of access side optical modules, the intermediate device includes a plurality of ports, each of the plurality of ports is implemented by a pair of physical ports, the pair of physical ports includes an uplink port and a downlink port, each of the plurality of access side optical modules is connected to any one of the plurality of ports through an optical fiber, different access side optical modules are connected to different ports, and each access side optical module corresponds to a downlink wavelength and an uplink wavelength, different access side optical modules correspond to different downlink wavelengths, and different access side optical modules correspond to different uplink wavelengths, the intermediate device includes: A unit for receiving a second downstream optical signal through an optical fiber, wherein the second downstream optical signal has a plurality of downstream wavelengths, and the plurality of downstream wavelengths include at least one downstream wavelength corresponding to the access-side optical module; a unit configured to divide the second downstream optical signal into a plurality of third downstream optical signals, each of the plurality of third downstream optical signals having the plurality of downstream wavelengths; A unit for transmitting a third downstream optical signal among the plurality of third downstream optical signals to a downstream port among the plurality of ports respectively; A unit for transmitting a third downstream optical signal to an access-side optical module connected to the downstream port through a downstream port among the multiple ports; A unit for receiving optical signals of multiple upstream wavelengths through an upstream port among the multiple ports, wherein the multiple upstream wavelengths include at least one upstream wavelength corresponding to the access-side optical module; A unit for coupling the optical signals of the plurality of upstream wavelengths into a first upstream optical signal; A unit for transmitting the first uplink optical signal via an optical fiber.

17. The intermediate device according to claim 16, characterized in that A downlink port among the multiple ports transmits a third downlink optical signal to an access-side optical module connected to the port through a downlink optical fiber connected to the downlink port.

18. The intermediate device according to claim 16, characterized in that For each of the multiple ports, an optical signal of an upstream wavelength transmitted by an access-side optical module connected to the port is received through an upstream optical fiber connected to the upstream port in the port, thereby receiving optical signals of multiple upstream wavelengths.

19. The intermediate device according to claim 16, characterized in that The unit for dividing the second downstream optical signal into a plurality of third downstream optical signals divides the second downstream optical signal into a plurality of third downstream optical signals by energy splitting.

20. The intermediate device according to any one of claims 16 to 19, characterized in that: The second downlink optical signal comes from the central optical module and is received through the first optical fiber; The first uplink optical signal is transmitted to the central optical module through the second optical fiber.

21. The intermediate device according to any one of claims 16 to 19, characterized in that: The second downlink optical signal comes from the central optical module and is received through the first optical fiber; The first uplink optical signal is transmitted to the central optical module through the first optical fiber.

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