Equipment multiple access and communication system and method and electronic equipment

Abstract

The invention relates to the technical field of submarine cable optical communication, in particular to an equipment multiple access and communication system and method and electronic equipment, and the system comprises a shore-based control module which is used for modulating multiple paths of shore-based terminal signals to downlink filling waves, encoding the modulated shore-based terminal signals, and sending the encoded shore-based terminal signals to a wireless communication module; synthesizing a downlink optical signal with other downlink carriers and outputting the downlink optical signal; the decoding module is also used for receiving the uplink optical signal fed back by the equipment control module and decoding the uplink optical signal by using a decoding sequence corresponding to each equipment terminal signal; the equipment control module is used for receiving the downlink optical signal and decoding the downlink optical signal by using a decoding sequence corresponding to each shore-based terminal signal; and the coding module is also used for modulating the multi-path equipment terminal signals to uplink filling waves, coding the signals and synthesizing the signals and other carriers into uplink optical signals. According to the method, random access of multiple terminal devices is achieved through coding, all terminal signals share the same wavelength, and spectrum resources are greatly saved.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable optical communication, and in particular to a device multiple access and communication system, method and electronic equipment. Background Art

[0002] Submarine optical network systems can be divided into relayed submarine cable systems and non-relayed submarine cable systems according to the relay type. Among them, non-relayed submarine cable systems are mainly used in island-to-island and near-shore scenarios within a distance of 300km. Usually, there is no need to power the underwater equipment, and the number of underwater equipment is relatively small; relayed submarine cable systems are widely used in long-distance submarine communication scenarios, and the underwater equipment needs to be powered from the shore to support the operation of multiple underwater equipment. If classified by purpose, submarine optical networks can be divided into submarine communication networks and ocean observation and monitoring networks. Among them, submarine communication networks are the most widely used, carrying 99% of the communication traffic of human intercontinental communications. The underwater equipment used mainly includes repeaters and splitters; while the ocean observation and monitoring network is mainly used in scientific observation, resource exploration, military deployment and other fields. In addition to repeaters and splitters, underwater equipment also includes a large number of observation equipment.

[0003] Since the transmission distance of submarine optical networks is usually long and there is no electrical relay, the industry currently mainly uses COTDR technology to simultaneously detect the status of submarine optical fibers and repeaters. For splitters and other equipment, modulation schemes such as optical labels are mainly used, and the fill wavelength of COTDR is used to complete the control and status feedback of the splitters.

[0004] However, the current technical limitations of subsea equipment control and monitoring solutions include:

[0005] (1) Limited spectrum: The spectrum of submarine optical communication systems is a very precious resource, and too much spectrum cannot be allocated to each device;

[0006] (2) Access is limited. Under the premise of spectrum limitation, multiple control devices cannot be accessed at the same time, so it is impossible to communicate and control multiple devices at the same time. Summary of the invention

[0007] The present invention aims to provide a device multiple access and communication system, method and electronic device, which can realize control of device multiple access under the premise of saving spectrum resources.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] In a first aspect, a device multiple access and communication system is provided, including:

[0010] The shore-based control module is used to modulate multiple shore-based terminal signals into downlink filling waves, encode each modulated shore-based terminal signal, and synthesize the downlink optical signal with other downlink carriers to output, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence; it is also used to receive the uplink optical signal fed back by the device control module, and decode the uplink optical signal using the decoding sequence corresponding to each device terminal signal;

[0011] The device control module is used to receive the downlink optical signal and decode the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal; it is also used to modulate multiple device terminal signals onto an uplink filling wave and then encode them, and synthesize the uplink optical signal with other carriers, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

[0012] Furthermore, the multiple-channel shore-based terminal signals or the multiple-channel device terminal signals are modulated onto a filling wave of a COTDR carrier.

[0013] Furthermore, a first optical transceiver module is provided in the shore-based control module;

[0014] The first optical transceiver module comprises:

[0015] A first modulation unit, used for modulating the downlink multi-channel shore-based terminal signals into the fill wave of the downlink COTDR carrier;

[0016] The first optical codec is used to encode the modulated shore-based terminal signals to generate shore-side composite filling waves, wherein different orthogonal code sequences are used to encode the shore-based terminal signals; and is also used to decode the device-side composite filling waves to obtain multiple device terminal signals therefrom, wherein the orthogonal code sequences corresponding to the device terminal signals are used for decoding;

[0017] A first combining unit, used for combining the shore-end composite filling wave onto the downlink COTDR carrier;

[0018] The first wavelength division multiplexing unit is used to multiplex the downlink service carrier and the downlink COTDR carrier into the downlink optical signal transmitted along the same medium.

[0019] Furthermore, the first optical transceiver module further includes:

[0020] The data processing unit is used to demodulate and filter the received uplink optical signal to obtain a device-side composite filling wave, and send the device-side composite filling wave to the first optical codec for decoding.

[0021] Furthermore, a second optical transceiver module is provided in the device control module;

[0022] The second optical transceiver module comprises:

[0023] A second modulation unit, used for modulating the uplink multi-channel device terminal signal to the fill wave of the uplink COTDR carrier;

[0024] The second optical codec is used to encode the device terminal signal to generate the device terminal composite filling wave, wherein different orthogonal code sequences are used to encode the device terminal signal; and is also used to decode the shore terminal composite filling wave to obtain multiple shore terminal signals therefrom, wherein the orthogonal code sequences corresponding to the shore terminal signals are used for decoding;

[0025] A second combining unit, used for combining the equipment-side composite filling wave onto the uplink COTDR carrier;

[0026] The second wavelength division multiplexing unit is used to multiplex the uplink service carrier and the uplink COTDR carrier into the uplink optical signal transmitted along the same medium.

[0027] Furthermore, the second wavelength division multiplexing unit is also used to demodulate the received downlink optical signal to obtain the downlink COTDR carrier;

[0028] The second optical transceiver module also includes:

[0029] The filtering unit is used to filter the downlink COTDR carrier to obtain the shore-end composite filling wave, and send the shore-end composite filling wave to the second optical codec for decoding processing.

[0030] In a second aspect, a device multiple access and communication method is also provided, which is applied to the above-mentioned shore-based control module, and the method includes:

[0031] Modulate multiple shore-based terminal signals to the downstream filling wave, encode each modulated shore-based terminal signal, synthesize the downstream optical signal with other downstream carriers, and then output it to the device control module, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence;

[0032] The uplink optical signal fed back by the device control module is received, and the uplink optical signal is decoded by using a decoding sequence corresponding to each device terminal signal to obtain multiple device terminal signals.

[0033] Furthermore, the signals from each shore-based terminal are modulated onto the fill wave of the downstream COTDR carrier.

[0034] In a third aspect, a device multiple access and communication method is also provided, which is applied to the above-mentioned device control module, and the method includes:

[0035] receiving a downlink optical signal sent by a shore-based control module, and decoding the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal to obtain multiple shore-based terminal signals;

[0036] Multiple device terminal signals are modulated onto an uplink filling wave, each modulated device terminal signal is encoded and then synthesized with other uplink carriers to form an uplink optical signal, which is then output to the shore-based control module, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

[0037] Based on the same inventive concept, the present invention also provides an electronic device, comprising: a memory and a processor; the processor is used to read and execute a computer program stored in the memory to implement the aforementioned signal multiple access and communication method.

[0038] The technical effects of the present invention are as follows:

[0039] (1) Use coding to achieve random access to multiple terminal devices, including shore-based terminals and submarine equipment terminals, without the need to keep synchronization with other devices;

[0040] (2) Through orthogonal coding sequences, different shore-based terminal signals and different equipment terminal signals share the same transmission medium, which has strong anti-interference capability;

[0041] (3) Information transmission security is high, and each terminal signal requires a unique corresponding address code to complete decoding;

[0042] (4) All terminal signals share the same wavelength, greatly saving spectrum resources.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic diagram of the structure of a device multiple access and communication system provided in an embodiment of the present invention;

[0046] Figure 2A schematic diagram of the signal receiving and sending principle in the second optical transceiver module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The invention discloses a device multiple access and communication system, comprising a shore-based control module and a device control module. The shore-based control module is arranged in a shore-based control system, and the device control module is arranged in a submarine optical network, and the shore-based control module and the device control module can realize two-way communication.

[0049] The shore-based control module is used to modulate multiple shore-based terminal signals into downlink filling waves, encode each modulated shore-based terminal signal, and synthesize the downlink optical signal with other downlink carriers to output, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence; it is also used to receive the uplink optical signal fed back by the device control module, and decode the uplink optical signal using the decoding sequence corresponding to each device terminal signal;

[0050] The device control module is used to receive the downlink optical signal and decode the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal; it is also used to modulate multiple device terminal signals onto an uplink filling wave and then encode them, and synthesize the uplink optical signal with other uplink carriers, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

[0051] In the embodiment of the present invention, the shore-based terminal signal is a signal of a control terminal connected to a shore-based control system, and the device terminal signal is a signal of a control terminal connected to a submarine optical network. Multiple access to terminal devices is achieved by coding, and synchronization between terminals is not required. At the same time, optical code division multiple access technology is adopted to randomly access multiple shore-based terminal signals and multiple device terminal signals to the communication network through orthogonally designed coding sequences. Each terminal signal shares a transmission medium, has a high anti-interference ability, and all terminal signals share the same wavelength, which greatly saves spectrum resources.

[0052] The Coherent Optical Time Domain Reflectometer technology in optical fiber sensing is used to generate COTDR light, which can be used to detect the quality of optical cables, and its filling light can also be used to send control commands and feedback equipment status. According to a specific implementation, the C1-C96 channels of the C band (50GHz / Channel) are used as service channels, that is, the λ1-λ96 waves are service waves, and the C98 channel is used to transmit the COTDR carrier, that is, the λ98 wave is used for loss / gain detection of optical fibers and submarine repeaters. At the same time, the C99 channel is used as the filling channel of the COTDR carrier, and the filling light is used to send shore-based control commands and feedback the status of submarine equipment, that is, the terminal signal is modulated using the λ99 wave, and the C97 channel is vacant to reduce the crosstalk of the C98 / C99 channel to the service channel.

[0053] In an embodiment of the present invention, multiple shore-based terminal signals are modulated onto the fill wave of the downlink COTDR carrier, and after encoding each modulated shore-based terminal signal, the downlink optical signal is synthesized with the carrier of other channels; each device terminal signal is modulated onto the fill wave of the uplink COTDR carrier, and after encoding each modulated device terminal signal, the uplink optical signal is synthesized with the carrier of other channels.

[0054] The shore-based control module is provided with a first optical transceiver module for generating and outputting the downlink optical signal, and receiving and processing the uplink optical signal. Figure 1 As shown, the first optical transceiver module includes a first modulation unit, a first optical codec, a first combining unit, a first wavelength division multiplexing unit and a data processing unit.

[0055] When the first optical transceiver module is used as a signal sending end, the first modulation unit is used to modulate the downstream multi-channel shore-based terminal signals to the filling wave of the downstream COTDR carrier; the first optical codec is used to encode the modulated shore-based terminal signals to generate a shore-end composite filling wave, wherein different orthogonal code sequences are used to encode each shore-based terminal signal; the first combining unit is used to combine the shore-end composite filling wave onto the downstream COTDR carrier; the first wavelength division multiplexing unit is used to multiplex the downstream service carrier and the downstream COTDR carrier into a downstream optical signal transmitted along the same medium.

[0056] When the first optical transceiver module serves as a signal receiving end, the data processing unit is used to receive the uplink optical signal and perform demodulation and filtering processing to obtain the uplink service carrier, the uplink COTDR carrier and the device-end composite filling wave, and send the device-end composite filling wave to the first optical codec for decoding and processing; the first optical codec is used to decode the device-end composite filling wave to obtain multiple device terminal signals therefrom, wherein an orthogonal code sequence corresponding to each device terminal signal is used for decoding to obtain multiple device terminal signals therefrom.

[0057] In an embodiment of the present invention, the device control module is provided with a second optical transceiver module for generating and outputting an uplink optical signal, and receiving and processing a downlink optical signal. Figure 1 As shown, the second optical transceiver module includes a second modulation unit, a second optical codec, a second combining unit, a second wavelength division multiplexing unit and a filtering unit.

[0058] When the second optical transceiver module is used as a signal receiving end, the second wavelength division multiplexing unit is used to receive and demodulate the downlink optical signal to obtain a downlink service carrier and a downlink COTDR carrier; the filtering unit is used to filter the downlink COTDR carrier to obtain a COTDR detection wave and the shore-end composite filling wave, and send the shore-end composite filling wave to the second optical codec for decoding and processing, wherein the COTDR detection wave is used for loss / gain detection of optical fibers and submarine repeaters; the second optical codec is used to decode the shore-end composite filling wave to obtain multiple shore-based terminal signals therefrom, wherein an orthogonal code sequence corresponding to each shore-based terminal signal is used for decoding.

[0059] When the second optical transceiver module is used as a signal transmitting end, the second modulation unit is used to modulate the uplink multi-channel device terminal signals to the filling wave of the uplink COTDR carrier; the second optical codec is used to encode each device terminal signal to generate the device-end composite filling wave, wherein each device terminal signal is encoded using a different orthogonal code sequence; the second combining unit is used to combine the device-end composite filling wave onto the uplink COTDR carrier; the second wavelength division multiplexing unit is used to multiplex the uplink service carrier and the uplink COTDR carrier into an uplink optical signal transmitted along the same medium. In the device control module, an optical add / drop multiplexer OADM is used to up / downscale part of the wavelength signal from the downlink service carrier to realize service wavelength up / down processing, and the processed service carrier can be used as the uplink service carrier.

[0060] like Figure 2As shown in the figure, in a signal receiving and transmitting event, when the second transceiver module receives the downlink optical signal (including λ1-λ99 waves), it is demultiplexed into the service carrier (λ1-λ96 waves) and the COTDR carrier (λ98-λ99 waves) in the WDM. The service carrier can be processed for uplink and downlink. The filter filters the COTDR carrier to obtain the COTDR detection wave (λ98 wave) and the shore composite filling wave (λ99 wave). The optical codec is used to filter the shore composite filling wave (λ99 wave). ) after decoding, multiple shore-based terminal signals are obtained therefrom; when the second transceiver module is used to send device terminal signals, the multiple device terminal signals are modulated to the uplink λ99 wave, and encoded into a device-end composite fill wave using an optical codec, and combined into an uplink COTDR carrier (λ98-λ99 wave) using a combiner, and finally the service carrier (λ1-λ96 wave) and the COTDR carrier (λ98-λ99 wave) are wavelength-division multiplexed into an uplink optical signal (λ1-λ99 wave). According to Figure 2 According to the signal receiving and sending principle shown, each device terminal can also realize two-way communication with other device terminals on the seabed.

[0061] Furthermore, at the signal receiving end (including the signal receiving end of the first optical transceiver module and the second optical transceiver module), there are generally provided: a detector for performing photoelectric conversion on the optical signal obtained after decoding; a judger for judging the amplitude of the electrical signal obtained by the photoelectric conversion; a receiver for restoring the electrical signal to a terminal signal, wherein the electrical signal is restored to an equipment terminal signal in the first optical transceiver module, and the electrical signal is restored to a shore-based terminal signal in the second optical transceiver module. The above-mentioned detector, judger, and receiver are hardware devices that can realize corresponding functions in the prior art, and their structures are not specifically limited. In actual applications, each terminal signal enters the corresponding control circuit to control the current network node, for example, the shore-based terminal signal is used to issue a submarine equipment control command, and the equipment terminal signal is used to feedback the equipment status.

[0062] In the embodiment of the present invention, an optical code division multiple access (OCDMA) system is used to assign a unique optical domain address code to each terminal signal that is accessed, and random access of multi-terminal data is achieved by applying different coding sequences to the optical signal. OCDMA technology is a multiple access communication technology based on optical coding. Each terminal signal is assigned a unique coding sequence. These coding sequences have very low cross-correlation, usually pseudo-random codes or orthogonal codes, thereby ensuring that different terminal signals are transmitted independently of each other, which also means that when different terminal signals interfere with each other on the same channel, these interferences can be minimized by the decoder.

[0063] Specifically, at the signal transmitting end, an optical codec is used to perform a logical operation (such as a convolution operation) on each terminal signal and its corresponding coding sequence to generate a composite optical signal. Different terminal signals can be distinguished by uniquely assigned coding sequences, and each terminal signal is transmitted in the medium at the same time without interfering with each other, thereby realizing multi-user concurrent communication. The optical codec is preferably a fiber Bragg grating. The optical codec is an optical decoder when the encoded signal passes through, and an optical encoder when the original signal passes through. At the signal receiving end, the received composite optical signal is decoded in the optical codec using the same coding sequence as the terminal signal, so that the original data can be extracted from the composite optical signal to realize data recovery.

[0064] Based on the same inventive concept, an embodiment of the present invention also provides a device multiple access and communication method, which is applied to the above-mentioned shore-based control module. The method includes: modulating multiple shore-based terminal signals to a downlink filling wave, encoding each modulated shore-based terminal signal, synthesizing a downlink optical signal with other downlink carriers, and then outputting it to the device control module, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence; receiving the uplink optical signal fed back by the device control module, and decoding the uplink optical signal using a decoding sequence corresponding to each device terminal signal to obtain multiple device terminal signals therefrom.

[0065] In an embodiment of the present invention, according to a preferred implementation, each shore-based terminal signal is modulated to a fill wave of a downstream COTDR carrier, and each encoded shore-based terminal signal is multiplexed with the downstream COTDR carrier and the downstream service carrier to form the downstream optical signal transmitted along the same medium.

[0066] Based on the same inventive concept, another embodiment of the present invention also provides a device multiple access and communication method, which is applied to the above-mentioned device control module, including: receiving a downlink optical signal sent by a shore-based control module, and decoding the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal to obtain multiple shore-based terminal signals therefrom; modulating multiple device terminal signals onto an uplink filling wave, encoding each modulated device terminal signal and synthesizing the uplink optical signal with other uplink carriers, and then outputting the uplink optical signal to the shore-based control module, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

[0067] In an embodiment of the present invention, according to a preferred implementation, each device terminal signal is modulated to a fill wave of an uplink COTDR carrier, and the encoded device terminal signal is multiplexed with the uplink COTDR carrier and the uplink service carrier to form the uplink optical signal transmitted along the same medium.

[0068] In the embodiment of the present invention, coding is used to realize random access of multiple terminal devices, including shore-based terminals and submarine equipment terminals, without the need to keep synchronization with other devices; through the orthogonal design of coding sequences, different shore-based terminal signals and different equipment terminal signals share the transmission medium, and have strong anti-interference ability; information transmission security is high, and each terminal signal requires a unique corresponding address code to complete decoding; all terminal signals share the same wavelength, which greatly saves spectrum resources.

[0069] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, a memory, and a processor; the processor is used to read and execute a computer program stored in the memory to implement the above-mentioned signal multiple access and communication method.

[0070] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0071] The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, the functional modules in the various embodiments of the present invention may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0072] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0073] It should be noted that, for the convenience of description, the aforementioned method embodiments are all described as a series of action combinations, but those skilled in the art should be aware that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0074] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device multiple access and communication system, characterized in that: The system comprises: The shore-based control module is used to modulate multiple shore-based terminal signals into downlink filling waves, encode each modulated shore-based terminal signal, and synthesize the downlink optical signal with other downlink carriers to output, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence; it is also used to receive the uplink optical signal fed back by the device control module, and decode the uplink optical signal using the decoding sequence corresponding to each device terminal signal; The device control module is used to receive the downlink optical signal and decode the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal; it is also used to modulate multiple device terminal signals onto an uplink filling wave and encode them, and synthesize the uplink optical signal with other uplink carriers, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

2. The system according to claim 1, characterized in that The multi-channel shore-based terminal signals or the multi-channel equipment terminal signals are modulated onto the filling wave of the COTDR carrier.

3. The system according to claim 2, characterized in that The shore-based control module is provided with a first optical transceiver module; The first optical transceiver module comprises: A first modulation unit, used for modulating the downstream multi-channel shore-based terminal signals into the filling wave of the downstream COTDR carrier; The first optical codec is used to encode the modulated shore-based terminal signals to generate shore-side composite filling waves, wherein different orthogonal code sequences are used to encode the shore-based terminal signals; and is also used to decode the device-side composite filling waves to obtain multiple device terminal signals therefrom, wherein the orthogonal code sequences corresponding to the device terminal signals are used for decoding; A first combining unit, used for combining the shore-end composite filling wave onto the downlink COTDR carrier; The first wavelength division multiplexing unit is used to multiplex the downlink service carrier and the downlink COTDR carrier into the downlink optical signal transmitted along the same medium.

4. The system according to claim 3, characterized in that The first optical transceiver module further includes: The data processing unit is used to demodulate and filter the received uplink optical signal to obtain a device-side composite filling wave, and send the device-side composite filling wave to the first optical codec for decoding.

5. The system according to claim 3 or 4, characterized in that: A second optical transceiver module is provided in the device control module; The second optical transceiver module comprises: A second modulation unit, used for modulating the uplink multi-channel device terminal signal to the fill wave of the uplink COTDR carrier; The second optical codec is used to encode the device terminal signal to generate the device terminal composite filling wave, wherein different orthogonal code sequences are used to encode the device terminal signal; and is also used to decode the shore terminal composite filling wave to obtain multiple shore terminal signals therefrom, wherein the orthogonal code sequences corresponding to the shore terminal signals are used for decoding; A second combining unit, used for combining the equipment-side composite filling wave onto the uplink COTDR carrier; The second wavelength division multiplexing unit is used to multiplex the uplink service carrier and the uplink COTDR carrier into the uplink optical signal transmitted along the same medium.

6. The system according to claim 5, characterized in that The second wavelength division multiplexing unit is also used to demodulate the received downlink optical signal to obtain the downlink COTDR carrier; The second optical transceiver module also includes: The filtering unit is used to filter the downlink COTDR carrier to obtain the shore-end composite filling wave, and send the shore-end composite filling wave to the second optical codec for decoding processing.

7. A device multiple access and communication method, applied to the shore-based control module according to any one of claims 1 to 6, characterized in that: The method comprises: Modulate multiple shore-based terminal signals to the downstream filling wave, encode each modulated shore-based terminal signal, synthesize the downstream optical signal with other downstream carriers, and then output it to the device control module, wherein each shore-based terminal signal is assigned a unique and mutually orthogonal coding sequence; The uplink optical signal fed back by the device control module is received, and the uplink optical signal is decoded by using a decoding sequence corresponding to each device terminal signal to obtain multiple device terminal signals.

8. The method according to claim 7, characterized in that The signals from each shore-based terminal are modulated onto the fill wave of the downstream COTDR carrier.

9. A device multiple access and communication method, applied to the device control module according to any one of claims 1 to 6, characterized in that: The method comprises: receiving a downlink optical signal sent by a shore-based control module, and decoding the downlink optical signal using a decoding sequence corresponding to each shore-based terminal signal to obtain multiple shore-based terminal signals; Multiple device terminal signals are modulated onto an uplink filling wave, each modulated device terminal signal is encoded and then synthesized with other uplink carriers to form an uplink optical signal, which is then output to the shore-based control module, wherein each device terminal signal is assigned a unique and mutually orthogonal coding sequence.

10. An electronic device, characterized in that: include: Memory, processor; The processor is used to read and execute the computer program stored in the memory to implement the device multiple access and communication method described in any one of claims 7-8 or claim 9.

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