Signal transmission and processing method, sending device, receiving device and system

Abstract

The application provides a signal transmission and processing method, a sending device, a receiving device and a system, and the method comprises the following steps: a sending control module sends a control instruction to an optical switch according to a transmission period of a synchronization signal; when the optical switch is connected with a synchronization signal generation module, the synchronization signal generation module generates a synchronization signal; when the optical switch is connected with a communication signal generation module, the communication signal generation module generates a communication signal; a quantum signal generation module generates a quantum signal according to a signal parameter of the synchronization signal; a wave combining device combines the quantum signal and a multiplexed signal to obtain a mixed signal, and transmits the mixed signal to a receiving device through a single transmission medium. The transmission period of the synchronization signal is divided into two time slots, and the optical switch is controlled to send different signals in different time slots, so that single-link time division multiplexing is realized, multiple signal transmission can be realized through a single optical fiber, signal crosstalk is avoided, and optical fiber resources are significantly saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quantum communication, in particular to a signal transmission and encryption integrated processing method, a sending device, a receiving device and a system. BACKGROUND

[0002] At present, the Quantum Key Distribution (QKD) and classical communication co-fiber transmission scheme mostly adopts Wavelength Division Multiplexing (WDM) technology, that is, the quantum state signal and the classical communication signal are transmitted by using different wavelength channels. Since the synchronization signal, the classical communication signal and the quantum signal are transmitted by WDM in the QKD system, the new classical communication signal introduced will cause crosstalk problem to the quantum signal, resulting in the increase of quantum error rate, and the information transmission security cannot be guaranteed. If the transmission links of the quantum signal and the classical communication signal are deployed by using independent optical fibers, the optical fiber resources will be wasted. Therefore, how to save the optical fiber resources while guaranteeing the security of the transmission of the signal transmission and encryption integration is an urgent problem to be solved. SUMMARY

[0003] The present application aims at the deficiencies in the prior art, and provides a signal transmission and encryption integrated processing method, a sending device, a receiving device and a system, so as to solve the problem of how to save the optical fiber resources while guaranteeing the security of the transmission of the signal transmission and encryption integration in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0005] In a first aspect, the embodiments of the present application provide a signal transmission and encryption integrated processing method applied to a sending device, wherein the sending device comprises a sending control module, an optical switch, a synchronization signal generation module, a communication signal generation module, a quantum signal generation module and a wavelength combiner, and the method comprises the following steps:

[0006] The sending control module sends a control instruction to the optical switch according to the transmission period of the synchronization signal, so that the optical switch is connected to the synchronization signal generation module in the first stage of the transmission period, and the optical switch is connected to the communication signal generation module in the second stage of the transmission period, wherein the first stage corresponds to the pulse rising edge of the synchronization signal, and the second stage corresponds to the pulse falling edge of the synchronization signal;

[0007] The synchronization signal generation module generates a synchronization signal and sends the synchronization signal to the combiner when the optical switch is turned on with the synchronization signal generation module; the communication signal generation module generates a communication signal and sends the communication signal to the combiner when the optical switch is turned on with the communication signal generation module;

[0008] The quantum signal generation module generates a quantum signal according to a signal parameter of the synchronization signal and sends the quantum signal to the combiner;

[0009] The combiner performs combining processing on the quantum signal and a multiplexing signal to obtain a mixed signal, and sends the mixed signal to a receiving device through a single transmission medium, wherein the multiplexing signal includes the synchronization signal and the communication signal.

[0010] As a possible implementation, the sending control module sends a control instruction to the optical switch according to a transmission period of the synchronization signal, including:

[0011] In a transmission period of the synchronization signal, the sending control module sends a first turn-on instruction to the optical switch at a starting time of a pulse rising edge corresponding to the transmission period, and the optical switch is turned on with the synchronization signal generation module under the action of the first turn-on instruction;

[0012] After the optical switch is turned on with the synchronization signal generation module, the synchronization signal generation module generates and sends a synchronization signal;

[0013] At the end of the pulse rising edge, the sending control module sends a second turn-on instruction to the optical switch, and the optical switch is turned on with the communication signal generation module under the action of the second turn-on instruction;

[0014] After the optical switch is turned on with the communication signal generation module, the communication signal generation module generates and sends a communication signal.

[0015] As a possible implementation, the communication signal generation module includes a communication signal generation unit and a communication signal modulation unit;

[0016] The optical switch is turned on with the communication signal modulation unit under the action of the first turn-on instruction;

[0017] The communication signal generation module generates and sends a communication signal, including:

[0018] The communication signal generation unit generates an original communication signal and sends it to the communication signal modulation unit;

[0019] The communication signal modulation unit modulates the original communication signal to obtain the communication signal.

[0020] As a possible implementation manner, the quantum signal generation module generates a quantum signal according to a signal parameter of the synchronization signal, including:

[0021] The quantum signal generation module determines a transmission time slot of the synchronization signal.

[0022] The quantum signal generation module generates a quantum signal in the transmission time slot.

[0023] As a possible implementation manner, the pulse amplitude of the synchronization signal is not equal to the pulse amplitude of the original communication signal before modulation, and the rising edge width of the synchronization signal is not equal to the rising edge width of the original communication signal before modulation.

[0024] In a second aspect, an embodiment of the present application provides a signal processing method, applied to a receiving device, the receiving device including a wave divider, a quantum signal recovery module, a signal detection module and a signal demodulation module, and the method including:

[0025] The wave divider performs wave division processing on a mixed signal in a transmission medium to obtain a quantum signal and a multiplexed signal, and sends the quantum signal to the quantum signal recovery module and the multiplexed signal to the signal detection module, the multiplexed signal including a synchronization signal generated in a first stage of a transmission period of the synchronization signal and a communication signal generated in a second stage of the transmission period of the synchronization signal.

[0026] The signal detection module separates the synchronization signal and the communication signal from the multiplexed signal and sends the synchronization signal and the communication signal to the signal demodulation module for demodulation.

[0027] The quantum signal recovery module demodulates the quantum signal.

[0028] As a possible implementation manner, the signal detection module separates the synchronization signal and the communication signal from the multiplexed signal, including:

[0029] The signal detection module performs signal separation on the multiplexed signal according to a time slot sequence and a signal parameter of the multiplexed signal to obtain the synchronization signal and the communication signal, the time slot sequence indicating time slot information of the first stage and the second stage obtained by time slot division on the transmission period of the synchronization signal.

[0030] As a possible implementation manner, the signal demodulation module includes a synchronization signal demodulation unit and a communication signal demodulation unit.

[0031] The sending of the synchronization signal and the communication signal to the signal demodulation module for demodulation comprises:

[0032] The signal detection module sends the communication signal to the communication signal demodulation unit and sends the synchronization signal to the synchronization signal demodulation unit.

[0033] The communication signal demodulation unit demodulates the communication signal to obtain communication information.

[0034] The synchronization signal demodulation unit demodulates the synchronization signal to obtain the transmission time slot of the synchronization signal and sends the transmission time slot of the synchronization signal to the quantum signal recovery module.

[0035] As a possible implementation manner, the quantum signal recovery module demodulates the quantum signal comprises:

[0036] The quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the synchronization signal to obtain quantum information.

[0037] As a possible implementation manner, further comprising:

[0038] The receiving device monitors the stability of the synchronization signal and the bit error rate of the communication signal in real time.

[0039] If the stability of the synchronization signal is less than a first threshold value, the proportion of the first stage in the transmission cycle is adjusted, and if the bit error rate of the communication signal is greater than a second threshold value, the proportion of the second stage in the transmission cycle is adjusted.

[0040] In a third aspect, the embodiments of the present application provide a sending device, comprising: a sending control module, an optical switch, a synchronization signal generation module, a communication signal generation module, a quantum signal generation module, and a combiner.

[0041] The sending device is configured to perform the steps of the signal processing method of the first aspect to send signals.

[0042] In a fourth aspect, the embodiments of the present application provide a receiving device, comprising: a wave splitter, a quantum signal recovery module, a signal detection module, and a signal demodulation module.

[0043] The receiving device is configured to perform the steps of the signal processing method of any one of the second aspect to receive signals.

[0044] In a fifth aspect, the embodiments of the present application provide a signal processing system, comprising: the sending device of the third aspect and the receiving device of the fourth aspect.

[0045] Sixthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the integrated signal communication and confidentiality processing method as described in either the first or second aspect above.

[0046] According to the signal communication and security processing method, transmitting device, receiving device, and system of this application, a time-slot control mechanism is adopted at the transmitting end to divide each transmission cycle of the synchronization signal into two stages. The first stage corresponds to the rising edge of the pulse, and the second stage corresponds to the falling edge of the pulse. The synchronization signal is transmitted in the first stage, and the modulated communication signal is transmitted in the second stage. An optical switch is used to achieve orderly switching and multiplexing of the two types of classical signals in time, forming a time-division multiplexed signal. Simultaneously, a quantum signal generation module accurately generates a quantum signal based on the time parameters of the synchronization signal, ensuring strict time alignment with the classical signal. Then, a multiplexer performs wavelength division multiplexing of the quantum signal and the multiplexed signal in different wavelength channels, forming a hybrid signal that can be transmitted in a single optical fiber. Correspondingly, at the receiving end, a wavelength divider is used to separate the quantum signal and the multiplexed signal by wavelength. Then, based on the time-slot characteristics of the synchronization signal, signal separation and demodulation are completed, ultimately achieving secure collaborative transmission of the quantum signal and classical communication. This application not only significantly saves optical fiber resources, but also effectively avoids signal crosstalk through unified time reference and differentiated signal parameter design, ensuring synchronization accuracy and the security of quantum communication, and realizing highly integrated and highly reliable unified transmission. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This paper shows a schematic diagram of the architecture of a signal communication and confidentiality integrated processing system provided in an embodiment of this application;

[0049] Figure 2 This invention provides an architectural schematic diagram of another integrated signal communication and confidentiality processing system according to an embodiment of the present application.

[0050] Figure 3 A schematic flowchart of a signal communication and confidentiality integrated processing method provided in an embodiment of this application is shown;

[0051] Figure 4 This illustration shows a time slot division diagram provided in an embodiment of this application;

[0052] Figure 5 A flow diagram of a time slot adjustment method is shown. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the drawings in the present application are only intended to illustrate and describe the present application, and should not be used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts in the present application show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content of the present application.

[0054] In addition, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] It should be noted that the term “comprises” will be used in the embodiments of the present application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0056] Figure 1 An architecture diagram of a signal transmission and encryption integrated processing system is shown. Referring to Figure 1 As shown, the signal transmission and encryption integrated processing system includes a sending device and a receiving device. The sending device includes a sending control module, an optical switch, a synchronization signal generation module, a communication signal generation module, a quantum signal generation module and a combiner, and the receiving device includes a splitter, a quantum signal recovery module, a signal detection module and a signal demodulation module. Further, referring to Figure 2 As shown, the communication signal generation module includes a communication signal generation unit and a communication signal modulation unit, and the signal demodulation module includes a synchronization signal demodulation unit and a communication signal demodulation unit.

[0057] Optionally, at the sending end (i.e. the side of the sending device), the quantum signal generation module is responsible for generating quantum signals such as polarization state photons, and sending the quantum signals to the coupler. The synchronization signal generation module is used to generate a synchronization signal conforming to specific parameters (e.g. amplitude , period ) to provide a time reference for the quantum signals. The communication signal modulation unit modulates the original communication signal generated and input by the communication signal generation unit, and outputs a communication signal conforming to specific parameters (e.g. amplitude , period ). The sending control module controls the optical switch according to the pre-agreed time slot instruction, switches to the synchronization signal channel in the first phase of the transmission period of the synchronization signal, and switches to the communication signal channel in the second phase of the transmission period, thereby forming a multiplexed signal of time division multiplexing. Further, the coupler combines the quantum signals and the multiplexed signal on different wavelength channels to generate a mixed signal, and transmits the mixed signal to the receiving device through a single optical fiber.

[0058] Optionally, at the receiving end (i.e. the side of the receiving device), the demultiplexer first separates the quantum signals and the multiplexed signal from the mixed signal, and sends the quantum signals to the quantum signal recovery module, which receives and recovers the quantum information. At the same time, the demultiplexer sends the multiplexed signal to the signal detection module, which performs signal type judgment on the multiplexed signal. Specifically, the synchronization signal and the communication signal are distinguished according to the time slot timing and signal parameters, and the synchronization signal is sent to the synchronization signal demodulation unit, and the communication signal is sent to the communication signal demodulation unit. The synchronization signal demodulation unit extracts the rising edge of the synchronization signal as a quantum state marker reference and outputs it to the quantum signal recovery module, and the communication signal demodulation unit demodulates the second phase communication signal to recover the original communication data. In summary, the signal secret integrated processing system realizes efficient and secure transmission of quantum signals and classical communication signals through the above process.

[0059] Therefore, according to the signal secret integrated processing system provided by the embodiments of the present application, the time reference of the synchronization signal ensures the accurate alignment of the quantum signals and the classical signals, avoids the interference between the signals, and guarantees the security of quantum communication and the reliability of classical communication. In addition, through time slot control and signal parameter differentiation design, the system can accurately distinguish and process different types of signals, further improving the accuracy and stability of signal processing. In this way, not only is the efficient coexistence transmission of quantum keys and classical communication signals in the same optical fiber realized, but also the optical fiber resources are significantly saved, and the integration and transmission efficiency of the system are improved.

[0060] The above Figure 1 and Figure 2The signal transmission and encryption integrated processing system is shown in the content described above, and the signal transmission and encryption integrated processing method provided by the embodiment of the application is described in detail.

[0061] Figure 3 A flowchart of a signal transmission and encryption integrated processing method provided by the embodiment of the application is shown, and the execution subject of the method is the sending device and the receiving device in the signal transmission and encryption integrated processing system described above. Referring to Figure 3 , the method specifically includes the following steps.

[0062] S301, the sending control module sends a control instruction to the optical switch according to the transmission period of the synchronization signal, so that the optical switch is turned on with the synchronization signal generation module in the first stage of the transmission period, and the optical switch is turned on with the communication signal generation module in the second stage of the transmission period.

[0063] Optionally, referring to Figure 4 , the first stage corresponds to the pulse rising edge of the transmission period, and the second stage corresponds to the pulse falling edge of the transmission period. Specifically, the first stage is the stage from the start time of the pulse rising edge to the end time of the pulse rising edge, and the second stage is the stage from the start time of the pulse falling edge to the end time of the pulse falling edge. It is worth noting that the end time of the pulse rising edge and the start time of the pulse falling edge are the same time. On this basis, the complete transmission period of the synchronization signal is composed of the transmission periods of the synchronization pulses, and the transmission period of one synchronization pulse refers to the time period from the start time of the rising edge of the synchronization pulse to the end time of the falling edge of the pulse, that is Figure 4 , the sum of the first stage and the second stage. Among them, the first stage is used for transmitting the synchronization signal, usually occupies a shorter time (for example, 1 μs) in the transmission period (for example, 10 μs), and is sent in the form of a pulse, and the rising edge thereof can be used as a time reference. The second stage follows the first stage and is used for transmitting the communication signal modulated from the original communication signal, and usually occupies the remaining time (for example, 9 μs) in the transmission period except the first stage.

[0064] Optionally, the sending control module divides the transmission period into two stages according to the transmission period of the synchronization signal: the first stage is used for sending the synchronization signal, and the second stage is used for sending the communication signal. The sending control module sends a switching instruction to the optical switch at the beginning of each transmission period, so that it turns on the path of the synchronization signal generation module in the first stage, and automatically switches to the path of the communication signal generation module after the end of the first stage. In this way, by using this time division multiplexing control method, the two types of signals, the synchronization signal and the communication signal, can be ensured not to overlap in time, avoiding interference.

[0065] S302, when the optical switch is turned on with the synchronization signal generation module, the synchronization signal generation module generates the synchronization signal.

[0066] Optionally, when the optical switch receives the control instruction sent by the transmission control module and switches to the side of the synchronization signal generation module, the synchronization signal generation module is activated and starts to work. The synchronization signal generation module is usually composed of a high-speed pulse generator, which is used to generate a periodic pulse signal with high time accuracy, and the rising edge of the pulse is taken as the time reference.

[0067] S303, the synchronization signal generation module sends the synchronization signal to the combiner.

[0068] Optionally, the synchronization signal generated by the synchronization signal generation module can be sent to the combiner through a signal transmission module, such as an optical path or an electrical signal path. It should be noted that at this time, the combiner has not yet completed the final mixing, but has begun to receive signals from different time periods, so as to ensure that the synchronization signal is sent into the subsequent multiplexing channel within the specified time slot, and prepares for the subsequent integration with the communication signal and the quantum signal.

[0069] S304, when the optical switch is connected with the communication signal generation module, the communication signal generation module generates the communication signal.

[0070] Optionally, when the transmission period enters the second stage, the optical switch receives the switching instruction sent by the transmission control module and switches to the side of the communication signal generation module. At this time, the communication signal generation module is started, the original communication signal is generated by the communication signal generation unit in the communication signal generation module, and the communication signal modulation unit in the communication signal generation module modulates the original communication signal to form a communication signal suitable for channel transmission.

[0071] S305, the communication signal generation module sends the communication signal to the combiner.

[0072] Optionally, after the communication signal modulation unit completes the modulation of the original communication signal, the communication signal is sent to the combiner. At this time, the combiner is in a receiving state, waiting to multiplex the communication signal with the synchronization signal previously transmitted to form a composite signal containing the synchronization signal and the communication information, that is, a multiplexing signal.

[0073] S306, the quantum signal generation module generates the quantum signal according to the signal parameters of the synchronization signal.

[0074] Optionally, the quantum signal generation module uses the key signal parameters (such as pulse rising edge time, period, phase, etc.) of the synchronization signal as a time reference to generate the quantum signal in the corresponding time slot. For example, under the trigger of the rising edge of each synchronization pulse, the quantum signal generation module generates a photon encoding quantum information, ensuring that the quantum signal is strictly aligned in time with the classical signal, facilitating synchronization recovery at the receiving end. It is worth noting that the generation of quantum signals by the quantum signal generation module, the generation of synchronization signals by the synchronization signal generation module, and the generation of communication signals by the communication signal generation module are independent steps, and the execution order is not limited.

[0075] S307, the quantum signal generation module sends the quantum signal to the combiner.

[0076] Optionally, the quantum signal generation module sends the quantum signal to the combiner through an independent optical path, so that the combiner combines the quantum signal with the multiplexed signal (synchronization / communication signal) on different wavelength channels to form a mixed signal that can be transmitted in a single optical fiber.

[0077] S308, the combiner combines the quantum signal and the multiplexed signal to obtain a mixed signal.

[0078] Optionally, the combiner integrates signals from different paths, receives time-division multiplexed synchronization signals and communication signals (multiplexed signals) on the one hand, and receives quantum signals on the other hand, and combines multiple different types of signals of different wavelengths into the same output port to form a mixed signal containing quantum information and classical information, realizing multi-signal co-fiber transmission.

[0079] S309, the combiner sends the mixed signal to the receiving device through a single transmission medium.

[0080] Optionally, the transmission medium is, for example, an optical fiber. After the combiner combines the quantum signal, the communication signal, and the synchronization signal into a mixed signal, the combiner can send the mixed signal to the demultiplexer in the receiving device using a single optical fiber. In this way, this integrated transmission method saves optical fiber resources and improves system integration, and can be widely used in quantum key distribution (QKD) and classical communication co-fiber systems.

[0081] S310, the demultiplexer demultiplexes the mixed signal in the transmission medium to obtain the quantum signal and the multiplexed signal.

[0082] Optionally, at the receiving end, the demultiplexer separates the mixed signal in the transmission medium according to the wavelength, separates the quantum signal to the quantum channel, and separates the multiplexed signal to the classical channel. During the demultiplexing process of the mixed signal, the demultiplexer can ensure that the two types of signals do not interfere with each other based on wavelength selectivity, and enter their respective processing paths.

[0083] S311, the wave divider sends the quantum signal to a quantum signal recovery module.

[0084] Optionally, the wave divider sends the separated quantum signal to the quantum signal recovery module for subsequent quantum state measurement and decoding.

[0085] S312, the wave divider sends the multiplexed signal to a signal detection module.

[0086] Optionally, the wave divider sends the separated multiplexed signal to the signal detection module to enable the signal detection module to analyze the time structure and signal characteristics of the multiplexed signal, thereby providing raw data for subsequent signal separation and demodulation.

[0087] S313, the signal detection module separates the synchronization signal and the communication signal from the multiplexed signal.

[0088] Optionally, the signal detection module extracts the synchronization signal and the communication signal from the multiplexed signal based on a preset time slot timing (e.g., taking the first stage in a transmission period as the synchronization signal transmission stage and the second stage in the transmission period as the communication signal transmission stage) and combining signal parameter (e.g., amplitude, rising edge width) differences. For example, taking a transmission period of 10 μs as an example, the signal extracted in the first 1 μs of each transmission period is taken as the synchronization signal, and the signal extracted in the last 9 μs is taken as the communication signal.

[0089] S314, the signal detection module sends the synchronization signal and the communication signal to a signal demodulation module.

[0090] Optionally, the signal detection module sends the separated synchronization signal and communication signal to the corresponding demodulation unit in the signal demodulation module, wherein the signal demodulation module includes a synchronization signal demodulation unit and a communication signal demodulation unit. Correspondingly, the synchronization signal is sent to the synchronization signal demodulation unit, and the communication signal is sent to the communication signal demodulation unit for targeted demodulation processing.

[0091] S315, the signal demodulation module demodulates the synchronization signal and the communication signal.

[0092] Optionally, the synchronization signal demodulation unit extracts the rising edge time of the synchronization pulse to generate an accurate clock reference for system synchronization. The communication signal demodulation unit, on the other hand, performs carrier recovery, phase synchronization, and demodulation on the communication signal to restore the original communication data. Through the coordinated work of the synchronization signal demodulation unit and the communication signal demodulation unit, the correct recovery of classical communication information is ensured.

[0093] S316, the quantum signal recovery module demodulates the quantum signal.

[0094] Optionally, the quantum signal recovery module detects and measures the quantum signal in a correct time window according to a time reference (transmission time slot) obtained from the synchronization signal. For example, the quantum signal recovery module selects a correct basis for polarization or phase measurement according to the synchronization information (rising edge of the synchronization pulse), and finally decodes the quantum information. In this way, high-precision time synchronization is achieved based on the rising edge of the synchronization signal, ensuring the accuracy of quantum state measurement.

[0095] Based on this, the signal processing method according to the embodiment of the present application adopts a time slot control mechanism at the sending end, divides each transmission period of the synchronization signal into two stages, the first stage corresponds to the pulse rising edge, and the second stage corresponds to the pulse falling edge, sends the synchronization signal in the first stage, sends the modulated communication signal in the second stage, and realizes the ordered switching and multiplexing of the two types of classical signals in time through the optical switch, forming a multiplexed signal of time division multiplexing. At the same time, the quantum signal generation module accurately generates the quantum signal according to the time parameter of the synchronization signal, ensures that it is strictly aligned in time sequence with the classical signal, and then the quantum signal and the multiplexed signal are wavelength division multiplexed in different wavelength channels through the coupler, forming a mixed signal that can be transmitted in a single optical fiber. Correspondingly, at the receiving end, the quantum signal and the multiplexed signal are separated by wavelength using a wave splitter, and then signal separation and demodulation are completed based on the time slot characteristics of the synchronization signal, finally realizing the secure cooperative transmission of quantum signals and classical communication. The present application not only significantly saves optical fiber resources, but also effectively avoids signal crosstalk through time reference unification and signal parameter differentiation design, ensures synchronization accuracy and the security of quantum communication, and realizes high integration and high reliability of integrated transmission.

[0096] As a possible implementation manner, the sending control module sends a control instruction to the optical switch according to the transmission period of the synchronization signal in the above step S301, which includes:

[0097] In one transmission period of the synchronization signal, the sending control module sends a first conduction instruction to the optical switch at the starting time of the pulse rising edge corresponding to the transmission period, and the optical switch is conducted with the synchronization signal generation module under the action of the first conduction instruction. After the optical switch and the synchronization signal generation module are conducted, the synchronization signal generation module generates and sends the synchronization signal. At the end of the pulse rising edge, that is, at the end of the first stage, the sending control module sends a second conduction instruction to the optical switch, and the optical switch is conducted with the communication signal generation module under the action of the second conduction instruction. After the optical switch and the communication signal generation module are conducted, the communication signal generation module generates and sends the communication signal.

[0098] Exemplarily, the present application provides a switching control mechanism of an optical switch, a sending control module according to a time allocation scheme of a preset synchronization pulse time slot (a first stage for transmitting a synchronization signal) and an idle time slot (a second stage for transmitting a communication signal), for example, 1 out of 10 transmission periods, the synchronization signal is transmitted in the synchronization pulse time slot, and the communication signal is transmitted in the idle time slot, and the sending control module sends an instruction to the optical switch according to the time allocation scheme to ensure that the signal switching is completed at the time slot boundary.

[0099] Exemplarily, the present application provides a switching trigger condition, which is based on the transmission period of the synchronization signal, and automatically triggers the synchronization pulse time slot at the start time of each transmission period. After the synchronization pulse time slot ends (for example, lasting 1 ), the sending control module sends a switching signal to the optical switch, and the optical switch switches from the synchronization signal channel to the communication signal channel, that is, the optical switch switches from the state of being connected to the synchronization signal generation module to the state of being connected to the communication signal generation module. When the idle time slot ends (for example, lasting 9 ), the next round of switching is triggered, and the optical switch switches from the communication signal channel back to the synchronization signal channel, that is, the optical switch switches from the state of being connected to the communication signal generation module to the state of being connected to the synchronization signal generation module, to form a periodic cycle.

[0100] As a possible implementation, as shown in Figure 2 , the communication signal generation module includes a communication signal generation unit and a communication signal modulation unit, and the optical switch is connected to the communication signal modulation unit under the action of a first connection instruction. On this basis, the communication signal generation module generates and sends a communication signal, including: the communication signal generation unit generates an original communication signal and sends it to the communication signal modulation unit, and the communication signal modulation unit modulates the original communication signal to obtain the communication signal.

[0101] ​Exemplarily, when the optical switch receives the first on-command, the optical switch establishes a connection with the communication signal modulation unit, and prepares to process the incoming original communication signal. In this process, the communication signal generation unit is responsible for generating the original communication signal, and delivering the original communication signal to the communication signal modulation unit for further processing. Specifically, the communication signal modulation unit modulates the original communication signal in a specific manner to adapt to the preset communication standard or protocol requirements, thereby forming the final communication signal. It should be noted that the generation process of the communication signal is orderly carried out under the precise time allocation scheme of the switching control mechanism, ensuring seamless switching between the synchronization pulse time slot (first stage) and the idle time slot (second stage), so that the whole communication process is efficient and reliable. In this way, the communication signal generation module can effectively generate and send the communication signal, ensuring the accuracy and continuity of information transmission.

[0102] It should be noted that, in order to prevent the rising edge of the communication signal from interfering with the pulse decision of the synchronization signal, the synchronization signal and the communication signal use different parameters, including pulse amplitude and rising edge width. Specifically, the pulse amplitude of the synchronization signal is not equal to the pulse amplitude of the original communication signal before modulation, and the rising edge width of the synchronization signal is not equal to the rising edge width of the original communication signal before modulation. For example, the pulse amplitude of the original communication signal is significantly different from the pulse amplitude of the synchronization signal, the pulse amplitude of the synchronization signal is , the pulse amplitude of the original communication signal is set to , , and and satisfy the identifiable threshold of the receiving device. Moreover, the rising edge width of the original communication signal is different from the pulse rising edge width of the synchronization signal, such as the rising edge width of the synchronization signal is set to , the rising edge width of the original communication signal is set to , and .

[0103] Based on this, the synchronization signal and the original communication signal use the dual parameter difference design of amplitude and rising edge width, so that even in the case of adjacent or crosstalk in the time domain, the receiving end can still accurately identify the synchronization pulse, prevent the communication signal from being misjudged as a synchronization signal due to edge changes, and thus ensure the stability of the signal processing system and the accuracy of the demodulation.

[0104] As a possible implementation, the step S306 of generating a quantum signal based on the signal parameters of the synchronization signal includes: determining the transmission time slot of the synchronization signal by the quantum signal generation module, and generating a quantum signal in the transmission time slot.

[0105] Exemplarily, the quantum signal generation module can detect the rising edge of each synchronization pulse in the synchronization signal through a high-speed comparator to determine the accurate time position of the transmission time slot. For example, if the synchronization signal transmits a pulse every 1 ms, the rising edge of each pulse is a transmission time slot, and the quantum signal will be triggered to be generated at this time.

[0106] Exemplarily, the quantum signal is usually a photon encoding quantum information, that is, quantum state encoding needs to be performed at the same time when the photon is generated. Common encoding methods include polarization encoding, phase encoding, time encoding, etc. The quantum signal generation module can include a time controller inside, which can generate a controllable trigger signal according to the rising edge of the synchronization pulse in the synchronization signal to ensure that the quantum signal is generated in the correct time window.

[0107] Based on this, the synchronization signal includes multiple synchronization pulses, and the time corresponding to the rising edge of the synchronization pulse can be used as a transmission time slot. The transmission time slot serves as a time marker, indicating when the quantum signal should be generated. The quantum signal generation module identifies the transmission time slot and accurately generates a quantum state at the corresponding time, thereby ensuring that the quantum signal and the classical synchronization / communication signal are strictly aligned in time.

[0108] As a possible implementation, the step S313 of separating the synchronization signal and the communication signal from the multiplexed signal includes: the signal detection module performs signal separation on the multiplexed signal according to the time slot timing and the signal parameters of the multiplexed signal to obtain the synchronization signal and the communication signal.

[0109] Exemplarily, the time slot timing indicates the time slot information of the first stage and the second stage obtained by time slotting the transmission period of the synchronization signal. The time slot timing determines the rule of time division of the transmission period of the synchronization signal and specifically indicates the specific time position and length of the first stage and the second stage, thereby providing a time reference for the signal detection module to separate the synchronization signal and the communication signal and ensuring that the corresponding signal is captured in the correct time slot.

[0110] Exemplarily, continuing to refer to Figure 4 As shown, the first stage is usually used for transmitting the synchronization signal, and the synchronization signal includes multiple synchronization pulses. The rising edge of each synchronization pulse serves as a time reference point for ensuring the clock synchronization between the receiving device and the transmitting device. The second stage is used for transmitting the communication signal and carrying the actual communication information. Further, the signal detection module determines the start and end time of the first stage and the second stage according to the time slot timing, that is, determines the time slot boundary, and then captures the synchronization signal in the first stage and captures the communication signal in the second stage according to the detected signal parameters and the time slot timing. For example, referring to Figure 4As shown, the rising edge of the first synchronization pulse marks the beginning of the first stage, and the falling edge marks the end of the first stage and the beginning of the second stage. After determining the time slot boundary, the signal detection module monitors the signal parameters of the multiplexed signal in real time, including frequency, phase, amplitude, and other characteristics of the signal, which can help distinguish different types of signals, such as distinguishing the signal characteristics of the synchronization signal and the communication signal by monitoring the changes in frequency, phase, or amplitude in the embodiments of the present application.

[0111] Based on this, the time slot timing defines the time division of the first stage and the second stage within the synchronization signal transmission period, and the signal detection module uses the time slot information and the signal characteristics of the multiplexed signal to extract the synchronization signal and the communication signal within the correct time window, thereby achieving effective separation of the synchronization signal and the communication signal.

[0112] As a possible implementation, continuing to refer to Figure 2 As shown, the signal demodulation module includes a synchronization signal demodulation unit and a communication signal demodulation unit. The above step S315 signal demodulation module demodulates the synchronization signal and the communication signal, including:

[0113] The signal detection module sends the communication signal to the communication signal demodulation unit and the synchronization signal to the synchronization signal demodulation unit. The communication signal demodulation unit demodulates the communication signal to obtain the communication information, and the synchronization signal demodulation unit demodulates the synchronization signal to obtain the transmission time slot of the synchronization signal and sends it to the quantum signal recovery module.

[0114] Exemplarily, the signal detection module first receives the multiplexed signal containing the synchronization signal and the communication signal from the combiner, separates the multiplexed signal into independent synchronization signal and communication signal, and sends the synchronization signal to the synchronization signal demodulation unit and the communication signal to the communication signal demodulation unit. Further, the communication signal demodulation unit starts demodulation operation after receiving the communication signal, and the specific processing method of the demodulation operation depends on the modulation mode of the communication signal, including amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM), etc. Accordingly, the communication signal demodulation unit demodulates according to the corresponding demodulation mode after receiving the communication signal, and the communication information can be obtained.

[0115] Exemplarily, after receiving the synchronization signal, the synchronization signal demodulation unit determines the transmission time slot of the synchronization signal by detecting the rising edge of each synchronization pulse in the synchronization signal. Specifically, the transmission time slot of the synchronization signal is generated according to the time point corresponding to the rising edge of the detected synchronization pulse, and is sent to the quantum signal recovery module, so that the quantum signal recovery module performs accurate quantum signal demodulation with the transmission time slot as the time reference.

[0116] Based on this, the signal detection module separates the synchronization signal and the communication signal from the received multiplexed signal, and sends them to the corresponding demodulation units for demodulation processing. Specifically, the communication signal demodulation unit is responsible for demodulating the communication signal to recover the original communication information, while the synchronization signal demodulation unit focuses on demodulating the synchronization signal, extracts the key transmission time slot, i.e. the rising edge of each synchronization pulse in the synchronization signal, and transmits the time slot information to the quantum signal recovery module, so that the quantum signal recovery module demodulates the quantum signal according to the time slot information.

[0117] As a possible implementation, the step S316 of demodulating the quantum signal by the quantum signal recovery module includes: demodulating the quantum signal by the quantum signal recovery module according to the transmission time slot of the synchronization signal to obtain quantum information.

[0118] Exemplarily, the synchronization signal is a synchronization pulse sequence containing multiple synchronization pulses, and the transmission time slot of the synchronization signal refers to the time point corresponding to the rising edge of the synchronization pulse, as shown in Figure 4 Each synchronization pulse in the synchronization pulse sequence has a distinct rising edge, and the time point corresponding to the rising edge can be used as a time reference point to represent the transmission time slot. In the embodiments of the present application, the quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the synchronization signal, i.e. using the rising edge as the time reference point, and distinguishes the rising edges to ensure that the rising edge of the synchronization pulse in the synchronization signal serves as the quantum state marker reference, thereby ensuring the synchronization reference of the quantum signal.

[0119] Exemplarily, the synchronization signal demodulation unit demodulates the synchronization signal, detects the rising edge of each synchronization pulse in the synchronization signal, and sends the time point corresponding to the rising edge of the synchronization pulse to the quantum signal recovery module as the transmission time slot. After receiving the quantum signal, the quantum signal recovery module performs time alignment using the rising edge of each synchronization pulse in the synchronization pulse sequence, for example, whenever a rising edge is detected, the quantum signal recovery module aligns the internal clock with the rising edge, ensuring that the subsequent quantum signal demodulation operation can be performed within the correct time window, thereby effectively eliminating the influence of clock drift and transmission delay.

[0120] Furthermore, after time alignment is completed, the quantum signal recovery module begins demodulating the quantum signal, capturing the quantum signal and performing corresponding decoding operations within a predetermined time window after the rising edge of each synchronization pulse. For example, if the quantum signal uses phase encoding, the quantum signal recovery module detects the phase state of the photon at a specific time point after each rising edge, thereby recovering the carried quantum information. If the quantum signal uses polarization encoding, the quantum signal recovery module detects the polarization direction of the photon at the time point corresponding to each rising edge to decode and obtain the quantum information.

[0121] Based on this, embodiments of this application provide a method for demodulating quantum signals using synchronization signals. The quantum signal recovery module utilizes the rising edge of the synchronization pulse in the synchronization signal as a time reference to ensure that the quantum signal is demodulated and read at the correct time point. The synchronization signal consists of multiple synchronization pulses, each rising edge marking a specific time point. These time points are used to label the quantum state, thereby ensuring that the demodulation process of the quantum signal remains strictly synchronized with the transmitting end. This avoids demodulation errors caused by clock drift or transmission delay, ensuring accurate recovery of quantum information. This not only improves the reliability of quantum communication but also provides effective technical support for quantum information transmission in complex environments.

[0122] Figure 5 A flowchart illustrating a time slot adjustment method provided in an embodiment of this application is shown. As one possible implementation, refer to... Figure 5 As shown, the method also includes:

[0123] S501 The receiving device monitors the stability of the synchronization signal and the bit error rate of the communication signal in real time.

[0124] For example, the stability of a synchronization signal can be determined by measuring the jitter of the rising edge of the synchronization signal pulse, and the greater the jitter, the lower the stability. For instance, ideally, each synchronization pulse of the synchronization signal should arrive at a fixed time, but due to factors such as channel noise and clock drift, the arrival time of the synchronization pulse may fluctuate (e.g., ±2μs), which means that the rising edge jitter is 2μs.

[0125] For example, the bit error rate (BER) of a communication signal represents the proportion of bits in the received data that are faulty. For instance, if one error is found after transmitting 1,000,000 bits, then the BER = 1E-6.

[0126] S502. If the stability of the synchronization signal is less than the first threshold, the proportion of the first stage in the transmission cycle is adjusted. If the bit error rate of the communication signal is greater than the second threshold, the proportion of the second stage in the transmission cycle is adjusted.

[0127] Exemplarily, the application provides an adaptive adjustment mechanism, which adjusts the proportion of the first stage (i.e. the synchronization pulse time slot) in the synchronization signal transmission period through the stability of the synchronization signal, and adjusts the proportion of the second stage (i.e. the idle time slot) in the synchronization signal transmission period through the error rate of the communication signal, so as to realize dynamic adjustment of resource allocation.

[0128] Exemplarily, the first threshold value is, for example, 5 μs, and the second threshold value is, for example, 1E-6. Taking the transmission period as 10 μs, the first stage as 1 μs, and the second stage as 9 μs as an example, the proportion of the first stage in the transmission period is 10%, and the proportion of the second stage in the transmission period is 90%. On this basis, if the stability of the synchronization signal is detected to be less than the first threshold value 5 μs, the proportion of the first stage in the transmission period is increased, for example, from the original 10% to 20%, so as to provide more synchronization signal transmission time or stronger synchronization signal, to help the receiving device to lock the clock more accurately, and to improve the synchronization reliability. If the error rate of the communication signal is detected to be greater than the second threshold value 1E-6, the proportion of the second stage in the transmission period is increased, for example, from the original 90% to 95%, so as to realize dynamic time slot allocation. In addition, if the stability of the synchronization signal is detected to be less than the first threshold value and the error rate of the communication signal is detected to be greater than the second threshold value, that is, when the two abnormal conditions occur at the same time, a composite strategy can be used to switch the modulation mode, wherein the composite strategy is, for example, to switch the time slot according to the priority, such as to preferentially guarantee the synchronization signal transmission, and then to switch to the communication channel for data transmission after the synchronization signal is restored to be stable.

[0129] It should be noted that, in the entire transmission period, when the proportions of the first stage and the second stage are adjusted, the proportion of one is adjusted, and the proportion of the other will also change accordingly, for example, when the error rate of the communication signal is detected to be greater than the second threshold value 1E-6, the proportion of the second stage in the transmission period is increased from the original 90% to 95%, and at the same time, the proportion of the first stage in the transmission period is decreased from the original 10% to 5%.

[0130] Based on this, the application provides a time slot adaptive adjustment mechanism, the receiving device dynamically adjusts the resource allocation of the synchronization and communication time slots by monitoring the synchronization signal stability and the communication signal error rate in real time, which not only can automatically optimize the signal communication and encryption integrated processing system performance when the channel condition changes, but also can take into account the stability and efficiency of the communication in the complex and changeable environment, and significantly improve the robustness and adaptability of the signal communication and encryption integrated processing system.

[0131] The application also provides a computer readable storage medium, which stores a computer program, and the computer program is run by a processor to execute the method steps in the signal communication and encryption integrated processing method according to any one of the above.

[0132] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in the present application. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The above-described device embodiments are only schematic, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed mutually can be indirect coupling or communication connection through some communication interface, device or module, and can be electrical, mechanical or other forms.

[0133] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. When the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or say the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of software products, which are stored in a storage medium and include a number of instructions for making a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and various program code storage media.

[0134] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application.

Claims

1. A signal transmission and encryption integrated processing method, characterized in that, The method is applied to a transmitting device, which includes: a transmitting control module, an optical switch, a synchronization signal generation module, a communication signal generation module, a quantum signal generation module, and a multiplexer; the transmitting device includes: The transmission control module sends a control command to the optical switch according to the transmission period of the synchronization signal, so that the optical switch is turned on with the synchronization signal generation module in the first stage of the transmission period, and the optical switch is turned on with the communication signal generation module in the second stage of the transmission period, wherein the first stage corresponds to the rising edge of the synchronization signal pulse, and the second stage corresponds to the falling edge of the synchronization signal pulse. When the optical switch is connected to the synchronization signal generation module, the synchronization signal generation module generates a synchronization signal and sends the synchronization signal to the multiplexer; when the optical switch is connected to the communication signal generation module, the communication signal generation module generates a communication signal and sends the communication signal to the multiplexer. The quantum signal generation module generates a quantum signal based on the signal parameters of the synchronization signal and sends the quantum signal to the multiplexer; The multiplexer performs multiplexing processing on the quantum signal and the multiplexed signal to obtain a mixed signal, and sends the mixed signal to the receiving device through a single transmission medium. The multiplexed signal includes the synchronization signal and the communication signal.

2. The method according to claim 1, characterized in that, The transmission control module sends control commands to the optical switch according to the transmission period of the synchronization signal, including: During one transmission cycle of the synchronization signal, the transmission control module sends a first conduction command to the optical switch at the start of the rising edge of the pulse corresponding to the transmission cycle, and the optical switch is turned on by the synchronization signal generation module under the action of the first conduction command. After the optical switch is turned on by the synchronization signal generation module, the synchronization signal generation module generates and sends a synchronization signal. At the end of the rising edge of the pulse, the transmission control module sends a second conduction command to the optical switch, and the optical switch is turned on by the communication signal generation module under the action of the second conduction command; After the optical switch is connected to the communication signal generation module, the communication signal generation module generates and sends a communication signal.

3. The method according to claim 2, characterized in that, The communication signal generation module includes: a communication signal generation unit and a communication signal modulation unit; The optical switch is turned on by the communication signal modulation unit under the action of the first turn-on command; The communication signal generation module generates and sends communication signals, including: The communication signal generation unit generates a raw communication signal and sends it to the communication signal modulation unit; The communication signal modulation unit modulates the original communication signal to obtain the communication signal.

4. The method according to claim 1, characterized in that, The quantum signal generation module generates a quantum signal based on the signal parameters of the synchronization signal, including: The quantum signal generation module determines the transmission time slot of the synchronization signal; The quantum signal generation module generates a quantum signal during the transmission time slot.

5. The method according to claim 1, characterized in that, The pulse amplitude of the synchronization signal is not equal to the pulse amplitude of the original communication signal before modulation, and the rising edge width of the synchronization signal is not equal to the rising edge width of the original communication signal before modulation.

6. A signal transmission and encryption integrated processing method, characterized in that, The method is applied to a receiving device, which includes: a wavelength division multiplexer (WDM), a quantum signal recovery module, a signal detection module, and a signal demodulation module. The wavelength divider performs wavelength division processing on the mixed signal in the transmission medium to obtain a quantum signal and a multiplexed signal, and sends the quantum signal to the quantum signal recovery module and the multiplexed signal to the signal detection module. The multiplexed signal includes a synchronization signal generated in the first stage of the transmission cycle of the synchronization signal and a communication signal generated in the second stage of the transmission cycle of the synchronization signal, wherein the first stage corresponds to the rising edge of the pulse of the synchronization signal and the second stage corresponds to the falling edge of the pulse of the synchronization signal. The signal detection module separates the synchronization signal and the communication signal from the multiplexed signal, and sends the synchronization signal and the communication signal to the signal demodulation module for demodulation. The quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the synchronization signal to obtain quantum information. The transmission time slot of the synchronization signal is obtained by demodulating the synchronization signal.

7. The method according to claim 6, characterized in that, The signal detection module separates the synchronization signal and the communication signal from the multiplexed signal, including: The signal detection module performs signal separation on the multiplexed signal according to the time slot timing and the signal parameters of the multiplexed signal to obtain the synchronization signal and the communication signal. The time slot timing indicates the time slot information of the first stage and the second stage obtained by dividing the transmission period of the synchronization signal into time slots.

8. The method according to claim 6, characterized in that, The signal demodulation module includes: a synchronization signal demodulation unit and a communication signal demodulation unit; The step of sending the synchronization signal and the communication signal to the signal demodulation module for demodulation includes: The signal detection module sends the communication signal to the communication signal demodulation unit and the synchronization signal to the synchronization signal demodulation unit; The communication signal demodulation unit demodulates the communication signal to obtain communication information; The synchronization signal demodulation unit demodulates the synchronization signal, obtains the transmission time slot of the synchronization signal, and sends the transmission time slot of the synchronization signal to the quantum signal recovery module.

9. The method according to claim 6, characterized in that, Also includes: The receiving device monitors the stability of the synchronization signal and the bit error rate of the communication signal in real time. If the stability of the synchronization signal is less than a first threshold, the proportion of the first stage in the transmission cycle is adjusted; if the bit error rate of the communication signal is greater than a second threshold, the proportion of the second stage in the transmission cycle is adjusted.

10. A transmitting device, characterized in that, include: Transmit control module, optical switch, synchronization signal generation module, communication signal generation module, quantum signal generation module, and multiplexer; The transmitting device is used to perform the steps in the integrated signal transmission and confidentiality processing method according to any one of claims 1-5 to transmit signals.

11. A receiving device, characterized in that, include: Wavelength divider, quantum signal recovery module, signal detection module, and signal demodulation module; The receiving device is used to perform the steps of the integrated signal transmission and confidentiality processing method according to any one of claims 6-9 to receive signals.

12. A signal transmission and encryption integrated processing system, characterized in that, include: The transmitting device of claim 10 and the receiving device of claim 11.

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