A communication method, device, system and train

Abstract

The application discloses a communication method, device, system and train, relates to the field of optical fiber communication, and is applied to a processor in any compartment of a train, wherein the processor is connected with an optical fiber ring network, the processor and train communication equipment in the compartment perform communication data interaction, and then the processor and the optical fiber ring network perform communication data interaction in the form of optical signals, so that the train communication equipment in different compartments can communicate with each other. The communication data is not easy to be lost and is not easy to be affected by electromagnetic interference through the mode of data transmission by optical fibers instead of cables, so that the communication quality of the train communication equipment is improved. Moreover, the communication data of multiple train communication equipments is converted into optical signals and transmitted in the form of a bundle of light, so that multiple communication networks are not needed, and only one optical fiber ring network can realize data transmission of multiple train communication equipments at the same time, so that the complexity of the wiring environment in the train is reduced, and the total weight of the train is reduced.

Description

Technical Field

[0001] This invention relates to the field of train communication, and in particular to a communication method, device, system, and train. Background Technology

[0002] Trains contain communication equipment such as multimedia systems, control systems, and monitoring systems. As trains become increasingly feature-rich, the network bandwidth requirements of these communication devices grow, making it difficult for the train's communication network to guarantee smooth communication. To ensure smooth communication between these devices, current technology typically establishes a separate, independent communication network for each device. Communication data from different systems is transmitted through their respective networks to avoid excessive bandwidth consumption by a single network, thus ensuring smooth communication. However, establishing multiple communication networks requires extensive cabling, complicating the cabling environment within the train and significantly increasing the overall weight, hindering weight reduction efforts. Furthermore, when a communication device needs to communicate over long distances within the train, data loss and electromagnetic interference can lead to poor communication quality. Summary of the Invention

[0003] The purpose of this invention is to provide a communication method, device, system, and train that makes communication data less susceptible to loss and electromagnetic interference, improves the communication quality of train communication equipment, eliminates the need to establish multiple communication networks, reduces the complexity of the wiring environment inside the train, and reduces the overall weight of the train.

[0004] To address the aforementioned technical problems, this invention provides a communication method for use with a processor in any carriage of a train, the processor being connected to an optical fiber ring network. The communication method includes:

[0005] When the first beam in the optical fiber ring network is acquired, all carrier optical signals containing communication data in the first beam are acquired.

[0006] Determine the carrier optical signal required by the train communication equipment in the carriage where the processor is located;

[0007] The carrier optical signal required by the train communication equipment is sent to the train communication equipment so that the train communication equipment can generate a feedback optical signal based on the carrier optical signal;

[0008] The feedback optical signal and all carrier optical signals not required by the train communication equipment are combined into a second beam, and the second beam is sent to the optical fiber ring network.

[0009] Preferably, determining the carrier optical signal required by the train communication equipment in the carriage where the processor is located, and sending the carrier optical signal required by the train communication equipment to the train communication equipment, includes:

[0010] Determine the first wavelength of each of the carrier optical signals;

[0011] Determine the second wavelength of the carrier optical signal required by the train communication equipment;

[0012] In each of the carrier optical signals, the carrier optical signal with the first wavelength and the second wavelength are sent to the train communication device.

[0013] Preferably, acquiring all carrier optical signals containing communication data in the first beam includes:

[0014] By utilizing the correspondence between preset wavelengths and communication data, the first light beam is decomposed into various carrier optical signals.

[0015] Preferably, decomposing the first light beam into individual carrier optical signals includes:

[0016] The first beam is decomposed into individual carrier optical signals by wavelength division multiplexing;

[0017] The second beam is synthesized from the feedback optical signal and all carrier optical signals not required by the train communication equipment, including:

[0018] The feedback optical signal and all the carrier optical signals that are not needed by the train communication equipment are combined into a second beam by wavelength division multiplexing.

[0019] Preferably, when the optical fiber in the optical fiber ring network is a multi-core optical fiber, the feedback optical signal and all the carrier optical signals not needed by the train communication equipment are combined into a second beam, and the second beam is sent to the optical fiber ring network, including:

[0020] Determine the first identifier corresponding to each optical fiber in the optical fiber ring network;

[0021] Determine the second identifier corresponding to the feedback optical signal and the third identifier corresponding to all carrier optical signals that are not needed by the communication signal;

[0022] In each of the carrier optical signals, the carrier optical signal whose third identifier matches the second identifier is combined with the feedback optical signal to form the second beam;

[0023] The second beam is transmitted into the fiber optic ring network through the fiber optic cable whose first identifier matches the second identifier.

[0024] Preferably, the carriage further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of an adjacent carriage via the optical fiber ring network, and the second optical fiber interface is connected to the first optical fiber interface of another adjacent carriage via the optical fiber ring network. Before acquiring all carrier optical signals containing communication data in the first beam, the method further includes:

[0025] The second optical fiber interface of the carriage is set to virtual disconnect mode, and the process proceeds to the step of acquiring all carrier optical signals containing communication data in the first beam.

[0026] Preferably, transmitting the second beam into the fiber optic ring network includes:

[0027] Determine the target carriage that needs to receive the feedback optical signal;

[0028] The second beam is transmitted to the fiber optic ring network through the first fiber optic interface;

[0029] After transmitting the second beam to the fiber optic ring network through the first fiber optic interface, the process further includes:

[0030] Determine whether the target carriage has successfully acquired the second beam;

[0031] If not, the second fiber optic interface in the control compartment is set to conduction mode so that the second beam can be sent to the fiber optic ring network through the second fiber optic interface.

[0032] This application also provides a communication device, including:

[0033] Memory, used to store computer programs;

[0034] A processor for implementing the communication method described above when executing the computer program.

[0035] This application also provides a communication system, including the communication device as described in claim 8, and further comprising:

[0036] Optical fibers are used to form optical fiber ring networks;

[0037] An optical transceiver is used to acquire a first beam of light in the optical fiber ring network through the optical fiber and send it to the communication device, and to transmit a second beam of light emitted by the communication device to the optical fiber ring network through the optical fiber;

[0038] The signal interaction module is used to send the carrier optical signal sent by the communication device to the train communication equipment in the train, and to send the communication data generated by the train communication equipment based on the carrier optical signal to the communication device.

[0039] Preferred options also include:

[0040] The photoelectric conversion module, disposed between the communication device and the signal interaction module, is used to convert the carrier optical signal in the form of an optical signal sent by the communication device into a carrier optical signal in the form of an electrical signal and send it to the signal interaction module, and to convert the communication data in the form of an electrical signal sent by the signal interaction module into a feedback optical signal in the form of an optical signal and send it to the communication device.

[0041] Preferably, the photoelectric conversion module includes:

[0042] Photoelectric converter and differential conversion module;

[0043] The photoelectric converter is used to convert the carrier optical signal in the form of an optical signal sent by the communication device into a first differential signal in the form of an electrical signal, and to convert the second differential signal in the form of an electrical signal sent by the differential conversion module into a feedback optical signal in the form of an optical signal and send it to the communication device.

[0044] The differential conversion module is used to convert the first differential signal in electrical signal form into a carrier optical signal in electrical signal form and send it to the signal interaction module, and to convert the communication data in electrical signal form sent by the signal interaction module into the second differential signal in electrical signal form.

[0045] This application also provides a train, including multiple carriages, and a communication system as described above;

[0046] The communication system is installed in each of the carriages.

[0047] This invention provides a communication method, apparatus, system, and train, relating to the field of fiber optic communication. It involves a processor located in any carriage of a train, connected to a fiber optic ring network. When a first light beam is acquired from the fiber optic ring network, all carrier optical signals containing communication data within the first beam are acquired. From these carrier optical signals, the carrier optical signals required by the train communication equipment in the carriage where the processor is located are determined and sent to the train communication equipment. The train communication equipment then generates a feedback optical signal based on the carrier optical signals. Finally, the feedback optical signal and all carrier optical signals not required by the train communication equipment are combined into a second light beam, which is then sent to the fiber optic ring network. By using fiber optics instead of cables for data transmission, communication data is less susceptible to loss and electromagnetic interference, improving the communication quality of the train communication equipment. Furthermore, by converting the communication data of multiple train communication devices into optical signals and merging them into a single beam for transmission, multiple communication networks are not required; only a single fiber optic ring network is needed to enable simultaneous data transmission by multiple train communication devices, reducing the complexity of the wiring environment within the train and decreasing the overall weight of the train. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A flowchart of a communication method provided in this application;

[0050] Figure 2 This application provides a schematic diagram of the structure of an optical fiber ring network;

[0051] Figure 3 A schematic diagram of a single-core optical fiber provided in this application;

[0052] Figure 4 A schematic diagram of a multi-core optical fiber provided in this application;

[0053] Figure 5 A schematic diagram of the structure of a communication device provided in this application;

[0054] Figure 6 A schematic diagram of the structure of a communication system provided in this application;

[0055] Figure 7 This is a schematic diagram of the structure of a differential conversion module provided in this application. Detailed Implementation

[0056] The core of this invention is to provide a communication method, device, system, and train. The communication data is not easily lost and is not easily affected by electromagnetic interference, which improves the communication quality of train communication equipment. Moreover, it eliminates the need to establish multiple communication networks, reduces the complexity of the wiring environment inside the train, and reduces the total weight of the train.

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] Please refer to Figure 1 , Figure 1 A flowchart of a communication method provided in this application is shown. The method involves a processor located in any carriage of a train, the processor being connected to a fiber optic ring network, and the communication method includes:

[0059] S1: When the first beam in the fiber optic ring network is acquired, acquire all carrier optical signals containing communication data in the first beam;

[0060] S2: Determine the carrier optical signal required by the train communication equipment in the carriage where the processor is located;

[0061] S3: Send the carrier optical signal required by the train communication equipment to the train communication equipment so that the train communication equipment can generate a feedback carrier optical signal based on the carrier optical signal;

[0062] S4: Combine the feedback carrier optical signal and all carrier optical signals not needed by the train communication equipment into a second beam, and send the second beam into the optical fiber ring network.

[0063] In current train systems, including multimedia systems, control systems, and monitoring systems, train communication equipment faces limitations due to the limited network bandwidth. A single cable cannot support data transmission for all train communication devices. Therefore, in existing technologies, each type of train communication device is typically networked separately as an independent communication network system. For example, current trains usually use cables supporting 100 Mbps and 1 Gbps bandwidth for networking. However, the monitoring system alone requires Ethernet with a 1 Gbps transmission rate, which means it needs cables with approximately 1 Gbps bandwidth for data transmission. It is clear that a single cable cannot support data transmission for all train communication devices. Therefore, each type of train communication device needs to establish an independent communication network that does not interfere with each other. While this method ensures that all train communication devices can transmit data normally, each type of train communication device is networked independently. Therefore, a separate set of cables needs to be laid for each type of train communication device. As a result, there will be multiple sets of cables in the train, each connecting all the carriages. This will make the wiring environment in the train complex, and the large number of cables will significantly increase the total weight of the train. In addition, the higher the transmission rate or bandwidth of the cable, the worse the anti-interference ability. Moreover, the longer the communication data propagates in the cable, the greater the signal loss and interference. During long-distance data transmission inside the train, the communication quality of the train communication devices is poor.

[0064] To address the aforementioned technical issues, this application utilizes optical fiber instead of cables for transmission. An optical fiber can achieve bandwidths of tens of THz, significantly exceeding the megabit or gigabit bandwidth of cables. A single optical fiber can support data transmission for all networks on the train. Optical fiber also exhibits low signal loss. For example, when transmitting an 800MHz signal, cables suffer a signal loss of over 40dB per kilometer, while optical fiber only incurs a loss of 0.2dB per kilometer. Furthermore, optical fiber transmission is unaffected by electromagnetic interference. Therefore, using a single optical fiber for all networks instead of separate cables for each network significantly reduces wiring complexity and overall train weight, while also improving data transmission quality.

[0065] Since the processors in each carriage are connected in series via optical fibers to form a communication network, it's clear that if one processor disconnects, the communication line between any two processors on either side of that processor will also be broken, preventing communication between them. Therefore, in addition to the series connection, the optical fiber output of the last carriage is then connected to the optical fiber input of the first carriage to form a fiber optic ring network. Please refer to [reference needed]. Figure 2 , Figure 2This application provides a schematic diagram of a fiber optic ring network structure. In practical applications, the default transmission direction of the light beam can be preset according to the order of the carriages. When a processor in one carriage is sending communication data to a processor in another carriage, if a disconnection is detected between the processors in the two carriages, the processor in the first carriage will send communication data to the processor in the other carriage from the opposite direction of the default transmission direction. This ensures normal communication between the processors in the two carriages even when a processor disconnects. For example, assuming there are four carriages A, B, C, and D, and their fiber optic ring network is ABCDA, with the default transmission direction of the light beam set to A to D, if the processor in carriage A needs to send communication data to the processor in carriage C, it will default to sending according to the ABC path. When a disconnection is detected in the processor in carriage B, the processor in carriage A will send communication data to the processor in carriage C from the opposite direction of the default transmission direction, i.e., the ADC path. This ensures that the processors in carriages A and C can still communicate normally even when carriage B is disconnected.

[0066] To achieve data transmission across all systems within a single optical fiber, this application predefines carrier optical signals with distinct characteristics for each train communication device. For example, it defines carrier optical signals with different wavelengths, wave speeds, or light intensities for each device. In practical applications, data transmission within the optical fiber involves combining all the different carrier optical signals into a single beam for transmission within the fiber. For the processor in each carriage, the processor is connected to all train communication devices within that carriage and to an optical fiber ring network. When a train communication device in another carriage sends communication data to that device in the current carriage, a carrier optical signal containing that data is transmitted through the optical fiber ring network. Upon receiving the first beam containing this carrier optical signal, the processor will... A beam of light is decomposed into multiple carrier optical signals containing communication data, and the carrier optical signals mentioned above are obtained from them. That is, the carrier optical signals required by the train communication equipment are determined, and then the carrier optical signals are sent to the train communication equipment, thereby realizing the purpose of communication between different carriages. When the train communication equipment needs to send communication data or provide communication feedback, the train communication equipment generates communication data or feedback data and converts it into the form of carrier optical signals. The processor receives the carrier optical signals and then combines them with the carrier optical signals that the train communication equipment in the carriage does not need from the previous decomposition into a new beam of light, that is, a second beam of light. Finally, it is sent to the optical fiber ring network so that the carrier optical signals can be sent to the carriages that need communication or feedback.

[0067] In summary, when the first beam of light in the fiber optic ring network is acquired, all carrier optical signals containing communication data within the first beam are obtained. From these carrier optical signals, the carrier optical signals required by the train communication equipment in the carriage where the processor is located are determined, and these required carrier optical signals are sent to the train communication equipment. The train communication equipment then generates feedback carrier optical signals based on these carrier optical signals. Finally, the feedback carrier optical signals and all carrier optical signals not required by the train communication equipment are combined into a second beam, which is then sent to the fiber optic ring network. Using fiber optics instead of cables for data transmission reduces data loss and electromagnetic interference, improving the communication quality of the train communication equipment. Furthermore, converting the communication data of multiple train communication devices into carrier optical signals and merging them into a single beam for transmission eliminates the need for multiple communication networks; only a single fiber optic ring network is required to enable simultaneous data transmission by multiple train communication devices, reducing the complexity of the cabling environment within the train and decreasing the overall weight of the train.

[0068] Based on the above embodiments:

[0069] As a preferred embodiment, determining the carrier optical signal required by the train communication equipment in the carriage where the processor is located, and sending the carrier optical signal required by the train communication equipment to the train communication equipment, includes:

[0070] Determine the first wavelength of each carrier optical signal;

[0071] Determine the second wavelength of the carrier optical signal required by the train communication equipment;

[0072] In each carrier optical signal, the carrier optical signal with the same first wavelength and second wavelength is sent to the train communication equipment.

[0073] To determine the carrier optical signal required by the train communication equipment, this application considers that wavelength is one of the obvious characteristics of light and is easy to measure. Therefore, the carrier optical signal required by the train communication equipment can be determined based on the wavelength of light. Specifically, since a beam of light transmitted in an optical fiber is actually a beam of light composed of multiple carrier optical signals, it is equivalent to the presence of a non-zero voltage signal in the cable, which is actually composed of multiple electrical communication data signals. In order to distinguish which train communication equipment each carrier optical signal belongs to, a different optical wavelength can be predefined for each train communication equipment. That is, each train communication equipment corresponds to a carrier optical signal of a certain wavelength. When the carrier optical signals transmitted by multiple train communication equipment are all transmitted in the light, the beam of light in the optical fiber is equivalent to a beam of light composed of multiple carrier optical signals of different wavelengths. When it is necessary to determine which carrier optical signals in this beam are the carrier optical signals required by the train communication equipment, since the wavelength corresponding to the train communication equipment is known to be the second wavelength, the first wavelength of each carrier optical signal can be detected. The carrier optical signal whose first wavelength matches the second wavelength of the train communication equipment is the carrier optical signal required by the train communication equipment. Please refer to Figure 3 , Figure 3 This application provides a schematic diagram of a single-core optical fiber. A carrier optical signal of a specific wavelength can be predefined for each train communication device. The wavelength of the carrier optical signal corresponding to the control data stream sent by the control system is λ1, and the wavelength of the carrier optical signal corresponding to the monitoring system is λ4, etc. When a beam of light is acquired, if a carrier optical signal of wavelength λ1 is detected within this beam, it can be determined that this carrier optical signal is the carrier optical signal required by the control system. Based on this, the carrier optical signal required by the train communication device can be determined simply and accurately using the wavelength of the carrier optical signal.

[0074] As a preferred embodiment, acquiring all carrier optical signals containing communication data in the first beam includes:

[0075] By utilizing the correspondence between preset wavelengths and communication data, the first beam is decomposed into individual carrier optical signals.

[0076] To accurately decompose the first light beam, this application utilizes the correspondence between wavelengths and communication data. Since the light beam is actually composed of multiple carrier optical signals of different wavelengths, it can be decomposed based on this correspondence. Specifically, according to a preset correspondence, the wavelength of the carrier optical signal corresponding to the control system is λ1, and the wavelength of the carrier optical signal corresponding to the monitoring system is λ4, etc. It should be noted that in practical applications, train communication equipment cannot guarantee that every transmitted carrier optical signal has a completely consistent wavelength. Therefore, a range can be set for the wavelength of each train communication device. Thus, wavelengths such as λ1 or λ4 refer to a wavelength band, not a precise wavelength value. For example, λ1 actually refers to a carrier optical signal in the wavelength band of 1300nm to 1350nm, not just a carrier optical signal with a wavelength of 1300nm. Based on this, the light beam can be decomposed according to wavelength bands, thereby obtaining the carrier optical signals within each wavelength band and accurately decomposing the first light beam.

[0077] As a preferred embodiment, the first beam is decomposed into individual carrier optical signals, including:

[0078] The first beam is decomposed into individual carrier optical signals using a wavelength division multiplexing (WDM) method.

[0079] The feedback optical signal and all carrier optical signals not needed by the train communication equipment are combined into a second beam, including:

[0080] Wavelength division multiplexing is used to combine the feedback optical signal and all carrier optical signals that are not needed by the train communication equipment into a second beam.

[0081] To simplify the decomposition and synthesis of optical beams, this application utilizes de-wavelength division multiplexing (WDM) and wavelength division multiplexing (WDM) methods. Specifically, WDM refers to the technique of combining multiple carrier optical signals of different wavelengths and coupling them into the same optical fiber for transmission; while de-wavelength division multiplexing separates the light in the optical fiber into optical carrier signals of different wavelengths. Specifically, WDM divides the optical fiber's low-loss window into several channels of different wavelengths based on wavelength. Upon receiving carrier optical signals from various train communication devices, a WDM multiplexer at the beam transmitting end combines these different wavelength carrier optical signals and sends them into a single optical fiber for transmission. De-wavelength division multiplexing works similarly, using a de-wavelength multiplexer to separate the beam into carrier optical signals of different wavelengths and send them to the corresponding train communication devices. Furthermore, compared to other beam decomposition and synthesis techniques, WDM and de-wavelength division multiplexing are passive devices, requiring no additional power supply and saving on the train's overall energy consumption. Based on this, wavelength division multiplexing and dewavelength division multiplexing can easily decompose and synthesize light beams.

[0082] In a preferred embodiment, when the optical fiber in the optical fiber ring network is a multi-core optical fiber, the feedback optical signal and all carrier optical signals not needed by the train communication equipment are combined into a second beam, and the second beam is sent into the optical fiber ring network, including:

[0083] Determine the first identifier corresponding to each optical fiber in the optical fiber ring network;

[0084] Determine the second identifier corresponding to the feedback optical signal and the third identifier corresponding to all carrier optical signals that are not needed by the communication signal;

[0085] In each carrier optical signal, the carrier optical signal whose third identifier matches the second identifier is combined with the feedback optical signal to form a second beam;

[0086] The second beam is transmitted into the fiber optic ring network through an optical fiber with the same first and second identifiers.

[0087] To improve the bandwidth of the fiber optic ring network, this application considers that with the development of technology, the network bandwidth required by various train communication devices may increase, potentially leading to situations where a single optical fiber cannot simultaneously transmit communication data from all train communication devices. Therefore, multi-core optical fibers can be used instead of single-core optical fibers in the fiber optic ring network. Each core of the fiber is considered as a communication data transmission path, and each core in the multi-core fiber is responsible for transmitting communication data from only one type of train communication device. Please refer to [reference needed]. Figure 4 , Figure 4 This application provides a schematic diagram of a multi-core optical fiber. The multi-core optical fiber contains four cores, each responsible for transmitting communication data from one of four communication systems. In practical applications, when combining the feedback optical signal and the carrier optical signal into a second beam, the feedback optical signal and the carrier optical signal belonging to the same train communication device can be combined into a second beam containing only the various carrier optical signals within the train communication device. This beam is then transmitted to the optical fiber ring network through the corresponding optical fiber core of the train communication device. Although the number of optical fiber cores is increased, this optical fiber is essentially a single optical cable composed of multiple cores. Compared to the existing method of using multiple sets of cables for multiple communication networks, this method offers advantages such as simpler wiring, reduced train weight, and improved communication quality. Therefore, by using multi-core optical fibers and transmitting communication data from different train communication devices through different optical fiber cores, the bandwidth of the optical fiber ring network is increased, ensuring smooth communication for the train communication devices.

[0088] In a preferred embodiment, the carriage further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of an adjacent carriage via an optical fiber ring network, and the second optical fiber interface is connected to the first optical fiber interface of another adjacent carriage via an optical fiber ring network. Before acquiring all carrier optical signals containing communication data in the first beam, the carriage further includes:

[0089] The second fiber optic interface of the carriage is set to virtual disconnect mode, and the process proceeds to the step of acquiring all carrier optical signals containing communication data in the first beam.

[0090] To ensure the normal transmission of the light beam and carrier optical signal, in this application, since each processor acquires the first light beam in the optical fiber and sends the second light beam into the optical fiber, it is evident that in practical applications, a large number of optical signals will be transmitted in the optical fiber. Furthermore, considering that an optical fiber ring network is a signal transmission line without a start and end point, in such a ring transmission line, the light beam sent by each processor will propagate repeatedly in the optical fiber. The processors in the optical fiber ring network will repeatedly receive the same carrier optical signal and, based on this, repeatedly send more second light beams into the optical fiber ring network, thereby causing a severe broadcast storm failure. To avoid broadcast storms while ensuring normal transmission of carrier optical signals, the fiber optic ring network needs to be actively disconnected to prevent it from forming a ring structure. Specifically, each carriage has two fiber optic interfaces. One of the carriages containing these processors can be defined as the main carriage, such as the driver's cab or monitoring room. One fiber optic interface in the main carriage is simulated as disconnected, i.e., the second fiber optic interface in the main carriage is set to a virtual disconnect mode. For example, a selector switch or input resistor can be added to the second fiber optic interface. By switching the switch on and off or increasing the input resistance, the second fiber optic interface is made to be virtually disconnected, thus making the fiber optic ring network a linear structure. Based on this, the repeated propagation of the beam and carrier optical signals in the fiber optic ring network is avoided, thereby ensuring the normal transmission of the beam and carrier optical signals. Furthermore, to ensure the integrity of the fiber optic ring network, only the virtual disconnection of the second fiber optic interface in one carriage is needed to achieve the goal of making the fiber optic ring network a linear structure; it is not necessary to virtually disconnect the second fiber optic interfaces of multiple carriages.

[0091] As a preferred embodiment, transmitting the second beam into the fiber optic ring network includes:

[0092] Identify the target carriage that needs to receive the feedback optical signal;

[0093] The second beam is transmitted to the fiber optic ring network through the first fiber optic interface;

[0094] After transmitting the second beam into the fiber optic ring network through the first fiber optic interface, the process also includes:

[0095] Determine whether the target carriage has successfully acquired the second beam;

[0096] If not, the second fiber optic interface in the control compartment is set to conduction mode so that the second beam can be sent to the fiber optic ring network through the second fiber optic interface.

[0097] To ensure the normal transmission of the optical beam and carrier signal, this application addresses the issue where a virtual disconnection at the second optical fiber interface of the main carriage causes the optical fiber ring network to become a linear structure. This means the processors in the two carriages can only communicate in one direction. If one of the processors between them disconnects during communication, the optical fiber ring network will be broken again, resulting in two linear structures and preventing communication between the two processors. This is equivalent to a real line breakage fault occurring despite the virtual disconnection at the optical fiber interface, preventing communication. Therefore, after a real line breakage fault occurs, the second optical fiber interface of the main carriage can be restored to its normal conducting state. This can be done by closing the selector switch at the second optical fiber interface or reducing the input resistance, thus restoring the second optical fiber interface from a virtual disconnection to a normal conducting state. At this point, the optical fiber ring network is equivalent to returning from two linear structures to a single linear structure. Changing the transmission direction of each processor then restores communication between any two processors on either side of the disconnected processor. This ensures the normal transmission of the optical beam and carrier signal.

[0098] Please refer to Figure 5 , Figure 5 A schematic diagram of a communication device provided in this application includes:

[0099] Memory 21 is used to store computer programs;

[0100] The processor 22 is used to implement the communication method described above when executing a computer program.

[0101] For a detailed description of the communication device provided in this application, please refer to the embodiments of the communication method described above; further details will not be repeated here.

[0102] Please refer to Figure 6 , Figure 6 A schematic diagram of a communication system provided in this application includes the communication device 32 as described above, and further includes:

[0103] Fiber 35 is used to form a fiber optic ring network;

[0104] Optical transceiver 31 is used to acquire the first beam in the optical fiber ring network through optical fiber 35 and send it to communication device 32, and to transmit the second beam emitted by communication device 32 to the optical fiber ring network through optical fiber 35.

[0105] The signal interaction module 34 is used to send the carrier optical signal sent by the communication device 32 to the train communication equipment in the train, and to send the communication data generated by the train communication equipment according to the carrier optical signal to the communication device 32.

[0106] For a detailed description of the communication system provided in this application, please refer to the embodiments of the communication method described above; further details will not be repeated here.

[0107] To ensure normal communication of the train communication equipment, in this application, the processor interacts with the train communication equipment through the signal interaction module 34, that is, the interaction between the carrier optical signal and the feedback optical signal. The processor obtains the beam in the optical fiber ring network through the optical transceiver 31. Multiple optical transceivers 31 can be set up, and one of them can be used as the master optical transceiver 31. In normal working scenarios, the other optical transceivers 31 can be idled, and only the master optical transceiver 31 is used to achieve the purpose of the communication device 32 obtaining the first beam from the optical fiber ring network and sending the second beam to the optical fiber ring network. When the communication device 32 cannot interact with the optical fiber ring network through the master optical transceiver 31 due to the line disconnection at the master optical transceiver 31 or the failure of the master optical transceiver 31, one of the idle other optical transceivers 31 can be used as the new master optical transceiver 31. Furthermore, when forming an optical fiber ring network, multiple optical transceivers 31 can be set up on both sides of each carriage to communicate with the carriages on the adjacent sides of the carriage respectively. Based on this, by setting up multiple optical transceivers 31 and using the backup optical transceiver 31 as the new main optical transceiver 31 when the main optical transceiver 31 fails, the normal communication of the train communication equipment can be guaranteed.

[0108] Based on the above embodiments:

[0109] As a preferred embodiment, it also includes:

[0110] The photoelectric conversion module 33, which is disposed between the communication device 32 and the signal interaction module 34, is used to convert the carrier optical signal in the form of an optical signal sent by the communication device 32 into a carrier optical signal in the form of an electrical signal and send it to the signal interaction module 34, and to convert the communication data in the form of an electrical signal sent by the signal interaction module 34 into a feedback optical signal in the form of an optical signal and send it to the communication device 32.

[0111] To enable train communication equipment to receive carrier optical signals normally, this application considers the different models and types of train communication equipment used in actual applications. Some train communication equipment itself cannot perform photoelectric conversion, thus failing to acquire the carrier optical signal sent by communication device 32. Therefore, a photoelectric conversion module 33 can be set between communication device 32 and signal interaction module 34. Furthermore, signal interaction module 34 changes from transmitting optical signals to transmitting electrical signals. When communication device 32 sends a carrier optical signal to train communication equipment, it is first converted into an electrical signal by photoelectric conversion module 33 and sent to signal interaction module 34, which then sends the electrical signal to train communication equipment. Similarly, after train communication equipment acquires the carrier optical signal in electrical form, it generates a feedback signal. Signal interaction module 34 receives this feedback signal and sends it to photoelectric conversion module 33, which converts it back into an optical signal, i.e., the feedback optical signal, and then sends it to communication device 32. Based on this, photoelectric conversion enables train communication equipment that cannot perform photoelectric conversion to receive carrier optical signals normally.

[0112] In a preferred embodiment, the photoelectric conversion module 33 includes:

[0113] Photoelectric converter and differential conversion module;

[0114] The photoelectric converter is used to convert the carrier optical signal in the form of an optical signal sent by the communication device 32 into a first differential signal in the form of an electrical signal, and to convert the second differential signal in the form of an electrical signal sent by the differential conversion module into a feedback optical signal in the form of an optical signal and send it to the communication device 32.

[0115] The differential conversion module is used to convert the first differential signal in electrical signal form into a carrier optical signal in electrical signal form and send it to the signal interaction module 34, and to convert the communication data in electrical signal form sent by the signal interaction module 34 into a second differential signal in electrical signal form.

[0116] To ensure proper photoelectric conversion, this application considers that some photoelectric converters can only convert differential signals, and the electrical signals converted by photoelectric converters are usually also differential signals. To enable all photoelectric converters to perform photoelectric conversion on the feedback signals sent by the train communication equipment, a photoelectric converter and a differential conversion module are required. The photoelectric converter is responsible for converting between optical and electrical signals, that is, converting the carrier optical signal in optical form into an electrical signal, or converting the feedback signal in electrical form into an optical signal. The differential conversion module is used to further convert the carrier optical signal or the feedback signal. Specifically, when the photoelectric conversion module 33 converts the carrier optical signal in optical form into an electrical signal, the output electrical signal may be a high-speed differential signal. In this case, the differential conversion module needs to convert it into a lower-speed electrical signal in ordinary carrier optical signal before sending it to the train communication equipment. Similarly, when the train communication equipment sends a feedback signal in electrical form, the differential conversion module first converts the feedback signal in electrical form into a differential signal before sending it to the photoelectric converter for photoelectric conversion. The differential conversion module performs differential conversion by converting multiple feedback signals to a limited number of high-speed differential signals. Please refer to [link / reference needed]. Figure 7 , Figure 7 This is a schematic diagram of a differential conversion module provided in this application. Assuming the need is to convert electrical signals generated by train communication equipment into optical signals, the module first obtains the electrical signals from the train communication equipment via an electrical signal interface. Then, the MAC (Multiple Access Channel) module determines the number of channels in the electrical signal. Next, the Switch module decomposes the electrical signal into multiple single-channel signals and then fuses them into a differential signal with fewer channels. Finally, the MAC module on the right outputs a differential signal, which is sent to the photoelectric conversion module via the SerDes interface. For example, a 4-channel feedback signal can be decomposed into 4 single-channel signals and then fused into a 2-channel differential signal to achieve differential conversion. Based on this, by adding a differential conversion module, normal photoelectric conversion can be guaranteed.

[0117] This application also provides a train, characterized in that it includes multiple carriages and a communication system as described above;

[0118] The communication system is installed in each carriage.

[0119] For a detailed description of the train provided in this application, please refer to the embodiments of the communication method described above; further details will not be repeated here.

[0120] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0121] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A communication method, characterized in that, A processor used in any carriage of a train, the processor being connected to a fiber optic ring network, the communication method comprising: When the first beam in the optical fiber ring network is acquired, all carrier optical signals containing communication data in the first beam are acquired. Determine the carrier optical signal required by the train communication equipment in the carriage where the processor is located; The carrier optical signal required by the train communication equipment is sent to the train communication equipment so that the train communication equipment can generate a feedback optical signal based on the carrier optical signal; The feedback optical signal and all carrier optical signals not needed by the train communication equipment are combined into a second beam, and the second beam is sent to the optical fiber ring network; The carriage further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of an adjacent carriage via the optical fiber ring network, and the second optical fiber interface is connected to the first optical fiber interface of another adjacent carriage via the optical fiber ring network. Before acquiring all carrier optical signals containing communication data in the first beam, the system further includes: The second optical fiber interface of the carriage is set to virtual disconnect mode, and the process proceeds to the step of acquiring all carrier optical signals containing communication data in the first beam. Sending the second beam into the fiber optic ring network includes: Determine the target carriage that needs to receive the feedback optical signal; The second beam is transmitted to the fiber optic ring network through the first fiber optic interface; After transmitting the second beam to the fiber optic ring network through the first fiber optic interface, the process further includes: Determine whether the target carriage has successfully acquired the second beam; If not, the second fiber optic interface in the control compartment is set to conduction mode so that the second beam can be sent to the fiber optic ring network through the second fiber optic interface.

2. The communication method as described in claim 1, characterized in that, Determining the carrier optical signal required by the train communication equipment in the carriage where the processor is located, and sending the carrier optical signal required by the train communication equipment to the train communication equipment, includes: Determine the first wavelength of each of the carrier optical signals; Determine the second wavelength of the carrier optical signal required by the train communication equipment; In each of the carrier optical signals, the carrier optical signal with the first wavelength and the second wavelength are sent to the train communication device.

3. The communication method as described in claim 2, characterized in that, Acquire all carrier optical signals containing communication data in the first beam, including: By utilizing the correspondence between preset wavelengths and communication data, the first light beam is decomposed into various carrier optical signals.

4. The communication method as described in claim 3, characterized in that, Decomposing the first beam into individual carrier optical signals includes: The first beam is decomposed into individual carrier optical signals by wavelength division multiplexing; The second beam is synthesized from the feedback optical signal and all carrier optical signals not required by the train communication equipment, including: The feedback optical signal and all the carrier optical signals that are not needed by the train communication equipment are combined into a second beam by wavelength division multiplexing.

5. The communication method as described in claim 1, characterized in that, When the optical fiber in the optical fiber ring network is a multi-core optical fiber, the feedback optical signal and all the carrier optical signals not needed by the train communication equipment are combined into a second beam, and the second beam is sent to the optical fiber ring network, including: Determine the first identifier corresponding to each optical fiber in the optical fiber ring network; Determine the second identifier corresponding to the feedback optical signal and the third identifier corresponding to all carrier optical signals that are not needed by the train communication equipment; In each of the carrier optical signals, the carrier optical signal whose third identifier matches the second identifier is combined with the feedback optical signal to form the second beam; The second beam is transmitted into the fiber optic ring network through the fiber optic cable whose first identifier matches the second identifier.

6. A communication device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the communication method as described in any one of claims 1 to 5.

7. A communication system, characterized in that, Including the communication device as described in claim 6, further comprising: Optical fibers are used to form optical fiber ring networks; An optical transceiver is used to acquire a first beam of light in the optical fiber ring network through the optical fiber and send it to the communication device, and to transmit a second beam of light emitted by the communication device to the optical fiber ring network through the optical fiber; The signal interaction module is used to send the carrier optical signal sent by the communication device to the train communication equipment in the train, and to send the communication data generated by the train communication equipment based on the carrier optical signal to the communication device.

8. The communication system as described in claim 7, characterized in that, Also includes: The photoelectric conversion module, disposed between the communication device and the signal interaction module, is used to convert the carrier optical signal in the form of an optical signal sent by the communication device into a carrier optical signal in the form of an electrical signal and send it to the signal interaction module, and to convert the communication data in the form of an electrical signal sent by the signal interaction module into a feedback optical signal in the form of an optical signal and send it to the communication device.

9. The communication system as described in claim 8, characterized in that, The photoelectric conversion module includes: Photoelectric converter and differential conversion module; The photoelectric converter is used to convert the carrier optical signal in the form of an optical signal sent by the communication device into a first differential signal in the form of an electrical signal, and to convert the second differential signal in the form of an electrical signal sent by the differential conversion module into a feedback optical signal in the form of an optical signal and send it to the communication device. The differential conversion module is used to convert the first differential signal in electrical signal form into a carrier optical signal in electrical signal form and send it to the signal interaction module, and to convert the communication data in electrical signal form sent by the signal interaction module into the second differential signal in electrical signal form.

10. A train, characterized in that, It includes multiple carriages and a communication system as described in any one of claims 7 to 9; The communication system is installed in each of the carriages.

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