Signal co-fiber transmission system, method and related equipment based on multi-core optical fiber

Abstract

The present disclosure provides a signal co-fiber transmission system, method and related equipment based on multi-core optical fiber, which relates to the field of quantum communication technology. The system includes: a source quantum node, a destination quantum node, and a servo communication signal source arranged outside the intermediate quantum node, wherein the source quantum node and the intermediate quantum node are connected by a first multi-core optical fiber, and the destination quantum node and the intermediate quantum node are connected by a second multi-core optical fiber, so that conventional communication signals, quantum communication signals and servo communication signals can be transmitted through the same multi-core optical fiber. The present disclosure can realize the co-fiber transmission of multiple different types of communication signals based on multi-core optical fiber in a dual-field quantum key distribution network, while reducing noise interference between signals and improving signal transmission effect.

Description

Technical Field

[0001] The present disclosure relates to the field of quantum communication technology, and in particular to a signal co-fiber transmission system, method, and related equipment based on multi-core optical fibers. Background Art

[0002] In recent years, with the rapid development of information technology, the demand for communication security has become increasingly urgent. In traditional communication systems, information encryption technology is threatened by the high computing power of quantum computers and other technologies, making the confidentiality of communication data a pressing issue. To address this challenge, quantum key distribution (QKD), a new encryption method based on the principles of quantum mechanics, is widely considered a key technology for the future of communications.

[0003] Among them, the emergence of Twin-field-QKD (TF-QKD) provides an opportunity for long-distance quantum communication, which makes the relationship between the security key rate and the channel transmission rate develop from a linear relationship to a square root relationship. The current maximum transmission distance can exceed 1000km. Although TF-QKD can significantly extend the secure transmission distance, the technical requirements are relatively harsh. For example, the frequency difference between the lasers on the Alice and Bob sides is extremely small, and the noise count on the link is extremely weak. Constraints such as. In TF-QKD, in order to control the frequency of Alice and Bob's lasers to be consistent, servo signal frequency locking is generally used. Although frequency stability can be achieved, a separate optical fiber is usually allocated for the servo signal, which wastes optical fiber resources. Furthermore, classical signal transmission is usually also an independent optical fiber. Multiple optical fibers transmit multiple signals, which has low resource utilization and exacerbates the waste of optical fiber resources.

[0004] For this reason, multicore fiber (MCF) is often used to transmit multiple types of signals on a single fiber. This fiber utilizes space-division multiplexing (SDM) technology to increase fiber transmission capacity and improve spatial efficiency. With the development of technologies like higher-order modulation formats and multi-dimensional multiplexing, further increasing the capacity of single-core fiber is difficult and space is limited. Multicore fiber, which incorporates multiple cores within a single fiber, utilizes SDM technology to increase fiber capacity.

[0005] Therefore, in related technologies, co-transmitting classical and quantum signals in multi-core optical fibers can increase transmission capacity and improve resource utilization. However, when co-transmitting classical and TF-QKD quantum signals in multi-core optical fibers, the classical signals and the servo signals of the same wavelength often generate spatial and frequency noise interference on the quantum signals, degrading the safe transmission distance of TF-QKD and seriously affecting the transmission of multiple types of signals.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0007] The present disclosure provides a signal co-fiber transmission system, method and related equipment based on multi-core optical fiber, which at least to a certain extent overcomes the problem in related technologies that it is impossible to reduce noise interference between signals while transmitting multiple transmission signals in a co-fiber.

[0008] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by practice of the present disclosure.

[0009] According to one aspect of the present disclosure, a signal co-fiber transmission system based on a multi-core optical fiber is provided, comprising: a source quantum node, a destination quantum node, and a servo communication signal source disposed outside an intermediate quantum node, wherein the source quantum node and the intermediate quantum node are connected via a first multi-core optical fiber, and the destination quantum node and the intermediate quantum node are connected via a second multi-core optical fiber;

[0010] In which, the source quantum node is provided with a first quantum communication signal transmitter and a first conventional communication signal transceiver, the first quantum communication signal transmitter is used to send quantum communication signals along the first multi-core optical fiber, and the first conventional communication signal transceiver is used to receive or send conventional communication signals along the first multi-core optical fiber; the destination quantum node is provided with a second quantum communication signal transmitter and a second conventional communication signal transceiver, the second quantum communication signal transmitter is used to send quantum communication signals along the second multi-core optical fiber, and the second conventional communication signal transceiver is used to receive or send conventional communication signals along the second multi-core optical fiber; the intermediate quantum node is provided with a quantum communication signal receiver; the servo communication signal source sends a servo communication signal to the source quantum node along the first multi-core optical fiber, and the servo communication signal source sends a servo communication signal to the destination quantum node along the second multi-core optical fiber.

[0011] In some embodiments, the first conventional communication signal transceiver includes: a first conventional communication signal receiver and a first conventional communication signal transmitter, wherein the first conventional communication signal receiver is used to receive conventional communication signals along the first multi-core optical fiber, and the first conventional communication signal transmitter is used to send conventional communication signals along the first multi-core optical fiber.

[0012] In some embodiments, the second conventional communication signal transceiver includes: a second conventional communication signal receiver and a second conventional communication signal transmitter, wherein the second conventional communication signal receiver is used to receive conventional communication signals along the second multi-core optical fiber, and the second conventional communication signal transmitter is used to send conventional communication signals along the second multi-core optical fiber.

[0013] According to another aspect of the present disclosure, a signal co-fiber transmission method based on a multi-core optical fiber is also provided, including: adding an identifier to each core in the target multi-core optical fiber based on a preset rule; obtaining the transmission distance between the source quantum node and the destination quantum node; and selecting corresponding cores to transmit a plurality of signals to be transmitted based on the transmission distance between the source quantum node and the destination quantum node and the identifiers of each core, so that the target multi-core optical fiber meets the co-fiber transmission requirements of the dual-field quantum key distribution network.

[0014] In some embodiments, an identifier is added to each core in the target multi-core optical fiber based on a preset rule, including: selecting any outer edge core in the multi-core optical fiber as a reference core; making a tangent along the extension of the reference core to obtain a priority grouping line; translating the priority grouping line downward so that the priority grouping line passes through all the cores in the multi-core optical fiber in sequence; and adding identifiers to the cores on the same priority grouping line in a preset priority order from top to bottom, wherein the preset priority order is the left side of the priority grouping line, the right side of the priority grouping line, and the middle of the priority grouping line.

[0015] In some embodiments, the type of the signal to be transmitted includes at least one of the following: a servo communication signal, a quantum communication signal, and a conventional communication signal.

[0016] In some embodiments, according to the transmission distance between the source quantum node and the destination quantum node and the identifiers of each fiber core, the corresponding fiber core is selected to transmit the signal to be transmitted, including: judging whether the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold; if not, selecting a first preset number of fiber cores as quantum communication signal fiber cores in descending order of the fiber core identifiers, and selecting a second preset number of fiber cores as servo communication signal fiber cores in ascending order of the fiber core identifiers, wherein the sum of the first preset number and the second preset number is less than or equal to the total number of fiber cores in the multi-core optical fiber; if so, selecting a third preset number of fiber cores as quantum communication signal fiber cores in ascending order of the fiber core identifiers, and selecting a fourth preset number of fiber cores as servo communication signal servo cores in descending order of the fiber core identifiers, wherein the sum of the third preset number and the fourth preset number is less than or equal to the total number of fiber cores in the multi-core optical fiber.

[0017] In some embodiments, the number of remaining fiber cores is obtained, wherein the remaining fiber cores are the remaining fiber cores in the target multi-core optical fiber except the quantum communication signal fiber core and the servo communication signal fiber core; according to the ascending order of the fiber core identification, a fifth preset number of fiber cores are selected as the conventional forward communication signal fiber cores, wherein the fifth preset number does not exceed the number of the remaining fiber cores; according to the descending order of the fiber core identification, a sixth preset number of fiber cores are selected as the conventional backward communication signal fiber cores, wherein the sixth preset number does not exceed the number of the remaining fiber cores.

[0018] According to another aspect of the present disclosure, a signal co-fiber transmission device based on a multi-core optical fiber is also provided, including: a core identification adding module for adding identifications to each core in the target multi-core optical fiber based on preset rules; a transmission distance acquisition module for acquiring the transmission distance between the source quantum node and the destination quantum node; a core on-demand selection module for selecting corresponding cores to transmit a plurality of signals to be transmitted according to the transmission distance between the source quantum node and the destination quantum node and the identifications of each core, so that the target multi-core optical fiber meets the co-fiber transmission requirements of the dual-field quantum key distribution network.

[0019] According to another aspect of the present disclosure, an electronic device is also provided, which includes: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute any one of the above-mentioned multi-core optical fiber-based signal co-fiber transmission methods by executing the executable instructions.

[0020] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the signal co-fiber transmission method based on multi-core optical fiber described above is implemented.

[0021] According to another aspect of the present disclosure, a computer program product is provided, including a computer program, which, when executed by a processor, implements any of the above-mentioned methods for co-fiber transmission of signals based on multi-core optical fibers.

[0022] The disclosed embodiments provide a multi-core optical fiber-based signal co-fiber transmission system, method, and related equipment. These embodiments connect a source quantum node and a destination quantum node to an intermediate quantum node and a servo communication signal source, respectively, via a first multi-core optical fiber and a second multi-core optical fiber. Quantum communication signals, conventional communication signals, and servo communication signals can be transmitted over the same multi-core optical fiber. These disclosed embodiments enable co-fiber transmission of multiple different types of communication signals using multi-core optical fibers, while reducing noise interference between signals and improving signal transmission efficiency.

[0023] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0025] Figure 1 A schematic diagram of the architecture of a signal co-fiber transmission system based on a multi-core optical fiber in an embodiment of the present disclosure is shown;

[0026] Figure 2 A schematic diagram of another signal co-fiber transmission system architecture based on multi-core optical fibers according to an embodiment of the present disclosure is shown;

[0027] Figure 3 A flow chart of a signal co-fiber transmission method based on a multi-core optical fiber according to an embodiment of the present disclosure is shown;

[0028] Figure 4 A schematic cross-sectional view of a multi-core optical fiber according to an embodiment of the present disclosure is shown;

[0029] Figure 5 A schematic diagram of a signal co-fiber transmission device based on a multi-core optical fiber according to an embodiment of the present disclosure is shown;

[0030] Figure 6 A block diagram of an electronic device in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] In addition, the accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0033] For ease of understanding, before introducing the embodiments of the present disclosure, several terms involved in the embodiments of the present disclosure are first explained as follows:

[0034] QKD: Quantum key distribution.

[0035] TF-QKD: Twin-field QKD, dual-field quantum key distribution.

[0036] MCF: Multicore fiber.

[0037] The specific implementation of the embodiment of the present disclosure is described in detail below with reference to the accompanying drawings.

[0038] Figure 1 FIG. 1 shows a schematic diagram of a signal co-fiber transmission system architecture based on a multi-core optical fiber according to an embodiment of the present disclosure. Figure 1 As shown, the system architecture may include: a source quantum node 10, an intermediate quantum node 20, a servo communication signal source 202 and a destination quantum node 30, wherein the source quantum node 10 and the intermediate quantum node 20 are connected via a first multi-core optical fiber, and the destination quantum node 30 and the intermediate quantum node 20 are connected via a second multi-core optical fiber.

[0039] The source quantum node 10 may be provided with a first quantum communication signal transmitter 101 and a first conventional communication signal transceiver 102 , and the first conventional communication signal transceiver 102 may include a first conventional communication signal transmitter 1021 and a first conventional communication signal receiver 1022 .

[0040] A quantum communication signal receiver 201 may be provided on the intermediate quantum node 20 , and a servo communication signal source 202 may be provided outside the intermediate quantum node 20 .

[0041] The destination quantum node 30 may be provided with a second quantum communication signal transmitter 301 and a second conventional communication signal transceiver 302 . The second conventional communication signal transceiver 302 may include a second conventional communication signal transmitter 3021 and a second conventional communication signal receiver 3022 .

[0042] In one embodiment of the present disclosure, the first quantum communication signal transmitter 101 is used to send quantum communication signals along the first multi-core optical fiber, and the first conventional communication signal transceiver 102 is used to receive or send conventional communication signals along the first multi-core optical fiber, wherein the first conventional communication signal receiver 1022 is used to receive conventional communication signals along the first multi-core optical fiber, and the first conventional communication signal transmitter 1021 is used to send conventional communication signals along the first multi-core optical fiber.

[0043] In one embodiment of the present disclosure, the second quantum communication signal transmitter 301 is used to send quantum communication signals along the second multi-core optical fiber, and the second conventional communication signal transceiver 302 is used to receive or send conventional communication signals along the second multi-core optical fiber, wherein the second conventional communication signal receiver 3022 is used to receive conventional communication signals along the second multi-core optical fiber, and the second conventional communication signal transmitter 3021 is used to send conventional communication signals along the second multi-core optical fiber.

[0044] In one embodiment of the present disclosure, a quantum communication signal receiver 201 may be provided on the intermediate quantum node 20 for receiving the quantum communication signal sent by the source quantum node 10 along the first multi-core optical fiber and the quantum communication signal sent by the destination quantum node 30 along the second multi-core optical fiber.

[0045] In one embodiment of the present disclosure, the servo communication signal source 202 sends a servo communication signal to the source quantum node 10 along a first multi-core optical fiber, and the servo communication signal source 202 sends a servo communication signal to the destination quantum node 30 along a second multi-core optical fiber.

[0046] As can be seen from the foregoing, the disclosed embodiments connect the source quantum node and the destination quantum node to the intermediate quantum node and the servo communication signal source, respectively, via a first multi-core optical fiber and a second multi-core optical fiber, enabling transmission of quantum communication signals, conventional communication signals, and servo communication signals through the same multi-core optical fiber. The disclosed embodiments can achieve co-fiber transmission of multiple different types of communication signals using multi-core optical fibers, while reducing noise interference between signals and improving signal transmission efficiency.

[0047] Those skilled in the art will know that Figure 1 The number of source quantum nodes, intermediate quantum nodes, servo communication signal sources, and destination quantum nodes is merely illustrative. Any number of source quantum nodes, intermediate quantum nodes, servo communication signal sources, and destination quantum nodes may be used as needed. This disclosure does not limit this.

[0048] In one embodiment of the present disclosure, Figure 2 FIG. 1 shows another schematic diagram of a signal co-fiber transmission system architecture based on a multi-core optical fiber according to an embodiment of the present disclosure. Figure 2As shown, the system architecture may include: Alice end 10, Charlie end 20, servo signal source 202 and Bob end 30, Alice end 10 and Charlie end 20 are connected via a first multi-core optical fiber, and Bob end 30 and Charlie end 20 are connected via a second multi-core optical fiber, and both the first multi-core optical fiber and the second multi-core optical fiber are multi-core optical fibers containing N cores.

[0049] Among them, Alice end 10 can be provided with a first quantum signal transmitter 101 and a first classical signal transceiver 102, and the first classical signal transceiver 102 includes a first classical signal transmitter 1021 and a first classical signal receiver 1022; Charlie end 20 can be provided with a quantum signal receiver 201, and the servo signal source 202 is set on one side of Charlie end 20, but needs to be set outside Charlie end 20; Bob end 30 can be provided with a second quantum signal transmitter 301 and a second classical signal transceiver 302, and the second classical signal transceiver 302 includes a second classical signal transmitter 3021 and a second classical signal receiver 3022.

[0050] In one embodiment of the present disclosure, the quantum key distribution architecture adopted by the system is a dual-field QKD protocol, so the signal transmission process may involve the following three types of communication signals: classical signals (i.e., the above-mentioned conventional communication signals), quantum signals (i.e., the above-mentioned quantum communication signals), and servo signals (i.e., the above-mentioned servo communication signals). Among them, the classical signal includes a classical forward signal and a classical backward signal. The classical forward signal is used to transmit the classical data of Alice-Bob, and the transmission direction is from Alice end 10 to Bob end 30, directly passing through Charlie end 20, and not received at Charlie end 20. The classical backward signal is used to transmit the classical data of Bob-Alice, and the transmission direction is from Bob end 30 to Alice end 10, directly passing through Charlie end 20, and not received at Charlie end 20; the quantum signal is used to generate a security key, and the signal direction is from Alice end 10 to Charlie end 20, and from Bob end 30 to Charlie end 20; the servo signal is used to lock the frequency of the lasers of Alice end 10 and Bob end 30, and the signal direction is from Charlie end 20 to Alice end 10, and from Charlie end 20 to Bob end 30.

[0051] Those skilled in the art will know that Figure 2 The number of Alice terminals, Charlie terminals, servo signal sources, and Bob terminals is merely illustrative, and any number of Alice terminals, Charlie terminals, servo signal sources, and Bob terminals may be provided as needed, which is not limited in the present disclosure.

[0052] In one embodiment of the present disclosure, there is no need to use multiple optical fiber resources to transmit classical signals, TF-QKD quantum signals, servo signals, etc. The fusion transmission of the above signals can be achieved only through the common fiber transmission technology based on multi-core optical fibers, thereby increasing the optical fiber transmission capacity and reducing the optical fiber deployment cost.

[0053] Figure 3 A flow chart of a signal co-fiber transmission method based on a multi-core optical fiber according to an embodiment of the present disclosure is shown. Figure 3 As shown, the method includes the following steps:

[0054] S302: Add a label to each core in the target multi-core optical fiber based on a preset rule.

[0055] In one embodiment of the present disclosure, a rule for identifying the cores in a multi-core optical fiber is pre-set to sort the cores in the multi-core optical fiber, and each core can be identified in the form of numbers, letters, etc. It should be noted that the embodiment of the present disclosure does not specifically limit the identification form of the cores.

[0056] S304: Obtain the transmission distance between the source quantum node and the destination quantum node.

[0057] S306, selecting corresponding fiber cores to transmit multiple signals to be transmitted based on the transmission distance between the source quantum node and the destination quantum node and the identifiers of each fiber core, so that the target multi-core optical fiber meets the common fiber transmission requirements of the dual-field quantum key distribution network.

[0058] In one embodiment of the present disclosure, by comparing the transmission distance between the source quantum node and the destination quantum node with a preset threshold, the corresponding fiber core transmission different types of models are selected according to the corresponding identification order, so as to realize the transmission of different types of communication signals based on multi-core optical fiber in a dual-field quantum key distribution network.

[0059] It should be noted that the preset threshold is only related to the parameters of the multi-core optical fiber, and the embodiments of the present disclosure do not specifically limit this.

[0060] As can be seen from the foregoing, the disclosed embodiments connect the source quantum node and the destination quantum node to the intermediate quantum node and the servo communication signal source, respectively, via a first multi-core optical fiber and a second multi-core optical fiber, enabling transmission of quantum communication signals, conventional communication signals, and servo communication signals through the same multi-core optical fiber. The disclosed embodiments enable co-fiber transmission of multiple different types of communication signals based on multi-core optical fibers in a dual-field quantum key distribution network, while reducing noise interference between signals and improving signal transmission efficiency.

[0061] In one embodiment of the present disclosure, the above S302 includes: selecting any outer edge core in the target multi-core optical fiber as the reference core; making a tangent along the extension of the reference core to obtain a priority grouping line; translating the priority grouping line downward so that the priority grouping line passes through all the cores in the target multi-core optical fiber in sequence; and adding labels to the cores on the same priority grouping line in a preset priority order from top to bottom, wherein the preset priority order is the left side of the priority grouping line, the right side of the priority grouping line, and the middle of the priority grouping line.

[0062] In one embodiment of the present disclosure, the type of the signal to be transmitted includes at least one of the following: a servo communication signal, a quantum communication signal, and a conventional communication signal.

[0063] It should be noted that the embodiments of the present disclosure transmit signals in a dual-field quantum distribution key network, and therefore involve the above-mentioned three communication signals. The embodiments of the present disclosure can also support the transmission of more required types of signals in multi-core optical fiber cores in other network scenarios, with strong flexibility and scalability. The embodiments of the present disclosure do not make specific limitations on this.

[0064] In one embodiment of the present disclosure, if the transmission distance between the source quantum node and the destination quantum node is less than or equal to a preset threshold, the Raman scattering noise between the fiber cores generated by the classical forward signal is greater than the Raman scattering noise between the fiber cores generated by the classical backward signal; if the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold, the Raman scattering noise between the fiber cores generated by the classical forward signal is less than the Raman scattering noise between the fiber cores generated by the classical backward signal. Therefore, the above S306 includes: determining whether the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold; if not, selecting a first preset number of cores as quantum communication signal cores in descending order of the core identifiers, and selecting a second preset number of cores as servo communication signal cores in ascending order of the core identifiers, wherein the sum of the first preset number and the second preset number is less than or equal to the total number of cores in the target multi-core optical fiber; if so, selecting a third preset number of cores as quantum communication signal cores in ascending order of the core identifiers, and selecting a fourth preset number of cores as servo communication signal cores in descending order of the core identifiers, wherein the sum of the third preset number and the fourth preset number is less than or equal to the total number of cores in the target multi-core optical fiber.

[0065] In one embodiment of the present disclosure, there is no size relationship between the first preset number, the second preset number, the third preset number and the fourth preset number, and it is only related to the needs of various types of signals in the current dual-field quantum key distribution network. On the premise that the sum of the first preset number and the second preset number is less than or equal to the total number of cores in the target multi-core optical fiber and the sum of the third preset number and the fourth preset number is less than or equal to the total number of cores in the target multi-core optical fiber, the embodiment of the present disclosure does not specifically limit the values of the first preset number, the second preset number, the third preset number and the fourth preset number.

[0066] In one embodiment of the present disclosure, the method further includes: obtaining the number of remaining fiber cores, wherein the remaining fiber cores are the remaining fiber cores in the target multi-core optical fiber except the quantum communication signal fiber core and the servo communication signal fiber core; selecting a fifth preset number of fiber cores as conventional forward communication signal fiber cores in ascending order of the fiber core identifiers, wherein the fifth preset number does not exceed the number of remaining fiber cores; selecting a sixth preset number of fiber cores as conventional backward communication signal fiber cores in descending order of the fiber core identifiers, wherein the sixth preset number does not exceed the number of remaining fiber cores.

[0067] It should be noted that the fifth preset number and the sixth preset number only need to satisfy the requirement of not exceeding the number of remaining fiber cores, and the embodiment of the present disclosure does not specifically limit the values of the fifth preset number and the sixth preset number.

[0068] It should be noted that the above-mentioned process of selecting the conventional forward communication signal fiber core and the conventional backward communication signal fiber core can be carried out simultaneously or in any order. The embodiment of the present disclosure does not specifically limit the execution order of selecting the conventional forward communication signal fiber core and the conventional backward communication signal fiber core.

[0069] In one embodiment of the present disclosure, the fiber cores used to transmit quantum signals, servo signals, and classical signals are allocated according to the above-mentioned fiber core allocation strategy, which suppresses the noise of classical signals on quantum signals, reduces the noise interference of servo signals on quantum signals, and extends the safe transmission distance of co-fiber transmission.

[0070] Figure 4 A schematic diagram of a cross-section of a multi-core optical fiber according to an embodiment of the present disclosure is shown. Figure 4 As shown, the inner core section of the multi-core optical fiber is a regular hexagon, and the multi-core optical fiber contains 37 cores.

[0071] It should be noted that the inner core section shape and the number of cores of the multi-core optical fiber are merely exemplary, and the embodiments of the present disclosure do not impose any specific limitations on the inner core section shape and the number of cores of the multi-core optical fiber.

[0072] In one embodiment of the present disclosure, it is known in advance that the number of core requirements corresponding to the quantum signal transmission service is 1, the number of core requirements corresponding to the servo signal transmission service is 1, and the number of core requirements corresponding to the classical signal transmission service is two: the first classical fiber core requirement from Alice to Bob is 16, and the first classical fiber core requirement from Bob to Alice is 19; the second classical fiber core requirement from Alice to Bob is 19, and the second classical fiber core requirement from Bob to Alice is 16. After calculation based on the parameters of the multi-core optical fiber used, the preset threshold is 120km, and the transmission distance from Alice to Bob is 100km. According to the transmission distance from Alice to Bob, it can be seen that the transmission distance is less than the preset threshold, and therefore, the corresponding fiber core allocation rule needs to be adopted.

[0073] In one embodiment of the present disclosure, a dual-field quantum key distribution protocol can adopt a send or no send quantum key distribution protocol. For example, Alice and Bob each send a quantum signal to Charlie, with the wavelength of the quantum signal sent from Alice to Charlie and the wavelength of the quantum signal sent from Bob to Charlie both being 1550.12 nm. A two-channel classical forward signal is sent from Alice to Bob, with the wavelengths of the two-channel classical forward signals being 1548.11 nm and 1547.32 nm, respectively. A two-channel classical backward signal is sent from Bob to Alice, with the wavelengths of the two-channel classical backward signals being 1546.52 nm and 1545.72 nm, respectively. Charlie sends a servo signal to Alice and Bob, with the wavelength of the servo signal sent from Charlie to Alice and the wavelength of the servo signal sent from Charlie to Bob both being 1550.12 nm. Because the quantum signal and the servo signal have the same wavelength, the cores of the multi-core optical fiber need to be properly allocated to reduce noise interference between the two.

[0074] It should be noted that in actual situations, there is a situation where the number of fiber cores required for the classic forward signal sent by Alice to Bob is different from the number of fiber cores required for the classic backward signal sent by Bob to Alice. The numbers in the above embodiments are only for illustrative purposes, and the embodiments of the present disclosure do not make specific limitations on this.

[0075] Select one outer core of a 37-core fiber as core 1. Draw a tangent line along the outer extension of core 1, passing through the center of core 1 and only through core 1. Name this tangent line the priority grouping line. Shift this priority grouping line downward until it passes through all the cores in the 37-core fiber.

[0076] Take digital numbering as an example, Figure 4As shown in (a), the fiber cores on each priority grouping line are numbered from top to bottom. The fiber cores on the same priority grouping line are numbered consecutively according to the preset priority order until all the fiber cores are numbered. The preset priority order is: left side of the priority grouping line, right side of the priority grouping line, and center of the priority grouping line.

[0077] like Figure 4 As shown in (b), for the Alice-Charlie segment, the quantum cores (i.e., the quantum communication signal cores) are assigned in descending order of numbering, and core 1 is used to transmit quantum signals; the servo cores (i.e., the servo communication signal cores) are assigned in ascending order of numbering, and core 37 is used to transmit servo signals.

[0078] like Figure 4 As shown in (c), for the Bob-Charlie segment, the quantum cores are assigned in ascending order, and core 37 is used to transmit quantum signals; the servo cores are assigned in descending order, and core 1 is used to transmit quantum signals.

[0079] like Figure 4 As shown in (d), for the Alice-Charlie segment, the classic forward signal sent by Alice to Bob is allocated in ascending order of the classic fiber cores (i.e., the conventional forward communication signal cores mentioned above), and cores 2 to 17 are used to transmit the classic forward signal; the classic backward signal sent by Bob to Alice is allocated in descending order of the classic fiber cores (i.e., the conventional backward communication signal cores mentioned above), and cores 36 to 18 are used to transmit the classic backward signal.

[0080] like Figure 4 As shown in (e), for the Bob-Charlie segment, the classic forward signal sent from Alice to Bob is allocated in ascending order of the classic fiber cores, and cores 2 to 17 are used to transmit the classic forward signal; the classic backward signal sent from Bob to Alice is allocated in descending order of the classic fiber cores, and cores 36 to 18 are used to transmit the classic backward signal.

[0081] like Figure 4 As shown in (f), for the Alice-Charlie segment, the classic forward signal sent from Alice to Bob continues to be allocated in ascending order of the classic fiber cores, so cores 18 to 36 are used to transmit the classic forward signal; the classic backward signal sent from Bob to Alice continues to be allocated in descending order of the classic fiber cores, so cores 17 to 2 are used to transmit the classic backward signal.

[0082] like Figure 4As shown in (g), for the Bob-Charlie segment, the classic forward signal sent from Alice to Bob continues to be allocated in ascending order of the classic fiber cores, so cores 18 to 36 are used to transmit the classic forward signal; the classic backward signal sent from Bob to Alice continues to be allocated in descending order of the classic fiber cores, so cores 17 to 2 are used to transmit the classic backward signal.

[0083] It should be noted that the above-mentioned core allocation of the classic forward signal and the core allocation of the classic backward signal can be carried out simultaneously or in any order. The embodiment of the present disclosure does not specifically limit the execution order of the core allocation of the classic forward signal and the classic backward signal.

[0084] As can be seen from the above, the disclosed embodiments use multi-core fiber co-fiber transmission technology to improve space efficiency, enhance resource utilization, and reduce fiber deployment costs. It can support the core allocation during co-fiber transmission of classical signals and TF-QKD, and can effectively suppress the noise interference of servo signals on quantum signals, as well as the noise interference of classical signals on quantum signals, thereby improving the system performance of TF-QKD and extending the safe transmission distance. At the same time, the disclosed embodiments can adapt to a variety of fiber core requirements and can be expanded to multi-core optical fibers with any number of cores, with advantages such as strong flexibility and scalability.

[0085] Based on the same inventive concept, the present disclosure also provides a multi-core optical fiber-based signal co-fiber transmission device, as described in the following embodiments. Since the principles of the device embodiment to solve the problem are similar to those of the above-mentioned method embodiment, the implementation of the device embodiment can refer to the implementation of the above-mentioned method embodiment, and the repeated parts will not be repeated.

[0086] Figure 5 A schematic diagram of a signal co-fiber transmission device based on a multi-core optical fiber according to an embodiment of the present disclosure is shown. Figure 5 As shown, the device includes: a fiber core identification adding module 501, a transmission distance obtaining module 502 and a fiber core on-demand selecting module 503.

[0087] Among them, the fiber core identification adding module 501 is used to add identification to each fiber core in the target multi-core optical fiber based on preset rules; the transmission distance acquisition module 502 is used to obtain the transmission distance between the source quantum node and the destination quantum node; the fiber core on-demand selection module 503 is used to select the corresponding fiber core to transmit multiple signals to be transmitted based on the transmission distance between the source quantum node and the destination quantum node and the identification of each fiber core.

[0088] As can be seen from the foregoing, the disclosed embodiments connect the source quantum node and the destination quantum node to the intermediate quantum node and the servo communication signal source, respectively, via a first multi-core optical fiber and a second multi-core optical fiber, enabling transmission of quantum communication signals, conventional communication signals, and servo communication signals through the same multi-core optical fiber. The disclosed embodiments enable co-fiber transmission of multiple different types of communication signals based on multi-core optical fibers in a dual-field quantum key distribution network, while reducing noise interference between signals and improving signal transmission efficiency.

[0089] In one embodiment of the present disclosure, the above-mentioned core identification adding module 501 is also used to select any outer edge core in the target multi-core optical fiber as the reference core; make a tangent along the extension of the reference core to obtain a priority grouping line; translate the priority grouping line downward so that the priority grouping line passes through all the cores in the target multi-core optical fiber in sequence; and add identifications to the cores on the same priority grouping line in a preset priority order from top to bottom, wherein the preset priority order is the left side of the priority grouping line, the right side of the priority grouping line, and the middle of the priority grouping line.

[0090] In one embodiment of the present disclosure, the type of the signal to be transmitted includes at least one of the following: a servo communication signal, a quantum communication signal, and a conventional communication signal.

[0091] In one embodiment of the present disclosure, the above-mentioned fiber core on-demand selection module 503 is also used to determine whether the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold; if not, a first preset number of fiber cores are selected as quantum communication signal fiber cores in descending order of the fiber core identifiers, and a second preset number of fiber cores are selected as servo communication signal fiber cores in ascending order of the fiber core identifiers, wherein the sum of the first preset number and the second preset number is less than or equal to the total number of fiber cores in the target multi-core optical fiber; if so, a third preset number of fiber cores are selected as quantum communication signal fiber cores in ascending order of the fiber core identifiers, and a fourth preset number of fiber cores are selected as servo communication signal fiber cores in descending order of the fiber core identifiers, wherein the sum of the third preset number and the fourth preset number is less than or equal to the total number of fiber cores in the target multi-core optical fiber.

[0092] In one embodiment of the present disclosure, there is no size relationship between the first preset number, the second preset number, the third preset number and the fourth preset number, and it is only related to the needs of various types of signals in the current dual-field quantum key distribution network. On the premise that the sum of the first preset number and the second preset number is less than or equal to the total number of cores in the target multi-core optical fiber and the sum of the third preset number and the fourth preset number is less than or equal to the total number of cores in the target multi-core optical fiber, the embodiment of the present disclosure does not specifically limit the values of the first preset number, the second preset number, the third preset number and the fourth preset number.

[0093] In one embodiment of the present disclosure, the above-mentioned fiber core on-demand selection module 503 is also used to obtain the number of remaining fiber cores, wherein the remaining fiber cores are the remaining fiber cores in the target multi-core optical fiber except the quantum communication signal fiber core and the servo communication signal fiber core; according to the ascending order of the fiber core identification, a fifth preset number of fiber cores are selected as conventional forward communication signal fiber cores, wherein the fifth preset number does not exceed the number of remaining fiber cores; according to the descending order of the fiber core identification, a sixth preset number of fiber cores are selected as conventional backward communication signal fiber cores, wherein the sixth preset number does not exceed the number of remaining fiber cores.

[0094] It should be noted that the fifth preset number and the sixth preset number only need to satisfy the requirement of not exceeding the number of remaining fiber cores, and the embodiment of the present disclosure does not specifically limit the values of the fifth preset number and the sixth preset number.

[0095] It should be noted that the above-mentioned process of selecting the conventional forward communication signal fiber core and the conventional backward communication signal fiber core can be carried out simultaneously or in any order. The embodiment of the present disclosure does not specifically limit the execution order of selecting the conventional forward communication signal fiber core and the conventional backward communication signal fiber core.

[0096] Those skilled in the art will appreciate that various aspects of the present disclosure may be implemented as systems, methods, or program products. Therefore, various aspects of the present disclosure may be implemented in the following forms: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which may be collectively referred to herein as "circuits," "modules," or "systems."

[0097] Refer to the following Figure 6 hereinafter, an electronic device 600 according to this embodiment of the present disclosure is described. Figure 6 The electronic device 600 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present disclosure.

[0098] Figure 6 FIG. 1 is a block diagram of an electronic device according to an embodiment of the present disclosure. Figure 6 hereinafter, an electronic device 600 according to this embodiment of the present disclosure is described. Figure 6 The electronic device 600 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present disclosure.

[0099] like Figure 6 As shown, electronic device 600 is implemented as a general-purpose computing device. Components of electronic device 600 may include, but are not limited to, the aforementioned at least one processing unit 610, the aforementioned at least one storage unit 620, and a bus 630 connecting different system components (including storage unit 620 and processing unit 610).

[0100] The storage unit stores a program code, and the program code can be executed by the processing unit 610, so that the processing unit 610 performs the steps described in the "Exemplary Method" section of this specification according to various exemplary embodiments of the present disclosure. For example, the processing unit 610 can perform the following steps of the above method embodiment: adding an identifier to each core in the target multi-core optical fiber based on a preset rule; obtaining the transmission distance between the source quantum node and the destination quantum node; and selecting the corresponding core to transmit multiple signals to be transmitted based on the transmission distance between the source quantum node and the destination quantum node and the identifier of each core, so that the target multi-core optical fiber meets the common fiber transmission requirements of the dual-field quantum key distribution network.

[0101] The storage unit 620 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 6201 and / or a cache memory unit 6202 , and may further include a read-only memory unit (ROM) 6203 .

[0102] The storage unit 620 may also include a program / utility 6204 having a set (at least one) of program modules 6206, such program modules 6206 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0103] Bus 630 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0104] The electronic device 600 can also communicate with one or more external devices 640 (e.g., a keyboard, a pointing device, a Bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 600, and / or any device that enables the electronic device 600 to communicate with one or more other computing devices (e.g., a router, a modem, etc.). Such communication can occur via an input / output (I / O) interface 650. Furthermore, the electronic device 600 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 660. As shown, the network adapter 660 communicates with other modules of the electronic device 600 via a bus 630. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 600, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0105] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0106] Based on the same inventive concept, embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements any of the aforementioned methods for signal transmission using multi-core optical fibers. The implementation of this computer-readable storage medium embodiment can be referenced to the implementation of the aforementioned method embodiment, and any repetitions will not be repeated.

[0107] More specific examples of computer-readable storage media in the present disclosure may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fibers, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0108] In the present disclosure, a computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, which carries readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0109] Alternatively, the program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0110] In a specific implementation, the program code for performing the operations of the present disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, and the like, as well as conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a standalone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0111] It should be noted that although several modules or units of the device for action execution are mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be concretized in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0112] Furthermore, although the steps of the method of the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0113] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0114] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A signal co-fiber transmission system based on multi-core optical fiber, characterized in that: include: An intermediate quantum node is provided with a quantum communication signal receiver; a source quantum node, connected to the intermediate quantum node via a first multi-core optical fiber, and provided with a first quantum communication signal transmitter for sending quantum communication signals along the first multi-core optical fiber and a first conventional communication signal transceiver for receiving or sending conventional communication signals along the first multi-core optical fiber; a destination quantum node, connected to the intermediate quantum node via a second multi-core optical fiber, and provided with a second quantum communication signal transmitter for sending quantum communication signals along the second multi-core optical fiber and a second conventional communication signal transceiver for receiving or sending conventional communication signals along the second multi-core optical fiber; A servo communication signal source disposed outside the intermediate quantum node sends a servo communication signal to the source quantum node along the first multi-core optical fiber, and sends a servo communication signal to the destination quantum node along the second multi-core optical fiber; Among them, the signal co-fiber transmission system is used to select any outer edge core in the multi-core optical fiber as the reference core; make a tangent along the extension of the reference core to obtain a priority grouping line; translate the priority grouping line downward to pass through all the cores in sequence; add labels to the cores on the same priority grouping line in the order of left, right, and middle from top to bottom; and select the corresponding cores through the following steps to transmit multiple signals to be transmitted, so that the target multi-core optical fiber meets the co-fiber transmission requirements of the dual-field quantum key distribution network: If the transmission distance is less than or equal to the preset threshold, the cores are selected for the quantum communication signal in descending order of the core identifiers, and the cores are selected for the servo communication signal in ascending order of the core identifiers; if the transmission distance is greater than the preset threshold, the cores are selected for the quantum communication signal in ascending order of the core identifiers, and the cores are selected for the quantum communication signal in descending order of the core identifiers; Obtain the number of remaining cores in the target multi-core optical fiber except the quantum communication signal core and the servo communication signal core, select cores for the conventional forward communication signal in ascending order of the core identifiers, and select cores for the conventional backward communication signal in descending order of the core identifiers.

2. The signal co-fiber transmission system based on multi-core optical fiber according to claim 1, characterized in that: The first conventional communication signal transceiver includes: a first conventional communication signal receiver and a first conventional communication signal transmitter, wherein the first conventional communication signal receiver is used to receive conventional communication signals along the first multi-core optical fiber, and the first conventional communication signal transmitter is used to send conventional communication signals along the first multi-core optical fiber.

3. The signal co-fiber transmission system based on multi-core optical fiber according to claim 1, characterized in that: The second conventional communication signal transceiver includes: a second conventional communication signal receiver and a second conventional communication signal transmitter, wherein the second conventional communication signal receiver is used to receive conventional communication signals along the second multi-core optical fiber, and the second conventional communication signal transmitter is used to send conventional communication signals along the second multi-core optical fiber.

4. A signal co-fiber transmission method based on multi-core optical fiber, characterized in that: include: Adding labels to each core of the target multi-core optical fiber based on preset rules; Obtain the transmission distance between the source quantum node and the destination quantum node; The following steps are performed to select corresponding fiber cores to transmit a plurality of signals to be transmitted, so that the target multi-core optical fiber meets the co-fiber transmission requirements of the dual-field quantum key distribution network: Determine whether the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold; if not, select a core for the quantum communication signal in descending order of the core identifiers, and select a core for the servo communication signal in ascending order of the core identifiers; if so, select a core for the quantum communication signal in ascending order of the core identifiers, and select a core for the quantum communication signal in descending order of the core identifiers; Obtaining the number of remaining fiber cores, selecting fiber cores for the conventional forward communication signal in ascending order of the core identifiers, and selecting fiber cores for the conventional backward communication signal in descending order of the core identifiers, wherein the remaining fiber cores are the remaining fiber cores in the target multi-core optical fiber except the quantum communication signal core and the servo communication signal core; Among them, the preset rule is to select any outer edge core in the multi-core optical fiber as the reference core, make a tangent along the extension of the reference core to obtain a priority grouping line, translate the priority grouping line downward, pass through all the cores in turn, and add labels to the cores on the same priority grouping line in order from top to bottom according to the preset priority order. The priority grouping line is a tangent along the extension of any outer edge core in the target multi-core optical fiber, and the preset priority order is the left side, right side, and middle of the priority grouping line.

5. The signal co-fiber transmission method based on multi-core optical fiber according to claim 4, characterized in that: Selecting a corresponding fiber core to transmit a signal to be transmitted according to a transmission distance between the source quantum node and the destination quantum node and identifiers of each fiber core includes: Selecting a first preset number of cores as quantum communication signal cores in descending order of the core identifiers, and selecting a second preset number of cores as servo communication signal cores in ascending order of the core identifiers, wherein the sum of the first preset number and the second preset number is less than or equal to the total number of cores in the multi-core optical fiber; Or, in ascending order of the core identifiers, a third preset number of cores are selected as quantum communication signal cores, and in descending order of the core identifiers, a fourth preset number of cores are selected as servo communication signal cores, wherein the sum of the third preset number and the fourth preset number is less than or equal to the total number of cores in the multi-core optical fiber.

6. The signal co-fiber transmission method based on multi-core optical fiber according to claim 5, characterized in that: The method further comprises: Selecting a fifth preset number of cores as regular forward communication signal cores in ascending order of the core identifiers, wherein the fifth preset number does not exceed the number of the remaining cores; A sixth preset number of cores are selected as regular backward communication signal cores in descending order of the core identifiers, wherein the sixth preset number does not exceed the number of the remaining cores.

7. A signal co-fiber transmission device based on multi-core optical fiber, characterized in that: include: A fiber core identification adding module is used to add identification to each fiber core in the target multi-core optical fiber based on preset rules; A transmission distance acquisition module is used to obtain the transmission distance between the source quantum node and the destination quantum node; A fiber core on-demand selection module is used to select corresponding fiber cores to transmit multiple signals to be transmitted based on the transmission distance between the source quantum node and the destination quantum node and the identifiers of each fiber core, so that the target multi-core optical fiber meets the common fiber transmission requirements of the dual-field quantum key distribution network; Among them, the fiber core on-demand selection module is used to determine whether the transmission distance between the source quantum node and the destination quantum node is greater than a preset threshold; if not, the fiber core is selected for the quantum communication signal in descending order of the core identifier, and the fiber core is selected for the servo communication signal in ascending order of the core identifier; if so, the fiber core is selected for the quantum communication signal in ascending order of the core identifier, and the fiber core is selected for the quantum communication signal in descending order of the core identifier; the number of remaining fiber cores is obtained, and the fiber core is selected for the conventional forward communication signal in ascending order of the core identifier, and the fiber core is selected for the conventional backward communication signal in descending order of the core identifier, wherein the remaining fiber cores are the remaining fiber cores in the target multi-core optical fiber except the quantum communication signal core and the servo communication signal core; Among them, the preset rule is to select any outer edge core in the multi-core optical fiber as the reference core, make a tangent along the extension of the reference core to obtain a priority grouping line, translate the priority grouping line downward, pass through all the cores in turn, and add labels to the cores on the same priority grouping line in order from top to bottom according to the preset priority order. The priority grouping line is a tangent along the extension of any outer edge core in the target multi-core optical fiber, and the preset priority order is the left side, right side, and middle of the priority grouping line.

8. An electronic device, characterized in that: include: processor; as well as a memory for storing executable instructions of the processor; The processor is configured to execute the signal co-fiber transmission method based on a multi-core optical fiber according to any one of claims 4 to 6 by executing the executable instructions.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the signal co-fiber transmission method based on a multi-core optical fiber according to any one of claims 4 to 6 is implemented.

10. A computer program product comprising: A computer program or instruction, characterized in that when the computer program or instruction is executed by a processor, it implements the signal co-fiber transmission method based on multi-core optical fiber as described in any one of claims 4 to 6.

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