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

Abstract

The application provides a signal communication and encryption integrated processing method, a sending device, a receiving device and a system, and relates to the technical field of quantum communication. The method comprises the following steps: a synchronization signal generation module generates a synchronization signal; a synchronization signal modulation module receives a communication signal, and performs pulse modulation on the synchronization signal according to the communication signal, so as to encode classical communication information carried by the communication signal into the synchronization signal, and obtain a modulated synchronization signal; a quantum signal generation module generates a quantum signal according to a signal parameter of the modulated synchronization signal; a wave combiner performs wave combining processing on the quantum signal and the modulated synchronization signal, and obtains a mixed signal; and the mixed signal is sent to a receiving device through a single transmission medium. According to the application, the classical communication information is encoded into the synchronization signal, and the synchronization signal is co-fiber transmitted with the quantum signal on a single optical fiber, so that the problem that the optical fiber resource is insufficient and the security of the communication and encryption integrated system is difficult to be considered is effectively solved.

Description

Technical Field

[0001] This application relates to the field of quantum communication technology, and more specifically, to a signal transmission and reception integrated processing method, a transmitting device, a receiving device, and a system. Background Technology

[0002] Quantum Key Distribution (QKD) systems typically include modules for quantum signal transmission, synchronization signal transmission, key negotiation, and post-processing. Among these, the synchronization signal is used to precisely mark the timing of quantum signal reception, ensuring that the sender and receiver are synchronized in time, which is crucial for the normal operation of the QKD system.

[0003] Currently, most QKD systems use separate optical fibers to transmit quantum signals and classical communication signals separately. While this deployment method effectively avoids signal interference, it results in low fiber resource utilization, high deployment costs, and complex maintenance, making it difficult to meet the needs of large-scale quantum network construction. To achieve resource conservation and system integration, existing technologies generally employ wavelength division multiplexing (WDM) technology, which uses different wavelength channels to transmit quantum state signals and classical communication signals separately. Because synchronization signals, classical communication signals, and quantum signals are transmitted on the same fiber using WDM at different wavelengths in a QKD system, the introduced new classical communication signals can cause crosstalk to the quantum signals, leading to a significant increase in the quantum error rate and compromising information transmission security. However, deploying separate optical fibers for the transmission links of quantum signals and classical communication signals would waste fiber resources. Therefore, how to ensure the security of integrated communication and encryption transmission while conserving fiber resources is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a signal communication and security integrated processing method, transmitting device, receiving device, and system, so as to solve the problem of how to ensure the security of communication and security integrated transmission while saving optical fiber resources in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, embodiments of this application provide a signal transmission and encryption integrated processing method applied to a transmitting device, the transmitting device comprising: a synchronization signal generation module, a synchronization signal modulation module, a quantum signal generation module, and a multiplexer, the method comprising:

[0007] The synchronization signal generation module generates a synchronization signal and sends the synchronization signal to the synchronization signal modulation module;

[0008] The synchronization signal modulation module receives the communication signal and performs pulse modulation on the synchronization signal according to the communication signal to encode the classical communication information carried by the communication signal into the synchronization signal to obtain the modulated synchronization signal. The synchronization signal modulation module sends the modulated synchronization signal to the multiplexer.

[0009] The quantum signal generation module generates a quantum signal based on the signal parameters of the modulated synchronization signal, and sends the quantum signal to the multiplexer;

[0010] The multiplexer performs multiplexing on the quantum signal and the modulated synchronization signal to obtain a mixed signal, and then transmits the mixed signal to the receiving device through a single transmission medium.

[0011] As one possible implementation, the transmitting device further includes: a communication signal generation module;

[0012] The communication signal generation module generates the communication signal and sends the communication signal to the synchronization signal modulation module;

[0013] The synchronization signal modulation module receives a communication signal and performs pulse modulation on the synchronization signal according to the communication signal to encode the classical communication information carried by the communication signal into the synchronization signal, thereby obtaining a modulated synchronization signal, including:

[0014] The synchronization signal modulation module receives the communication signal sent by the communication signal generation module, performs binary encoding on the classic communication information carried by the communication signal, and obtains the binary sequence corresponding to the classic communication information;

[0015] Based on the binary sequence, pulse modulation information is determined, which includes pulse width modulation information or pulse amplitude modulation information. The pulse width modulation information is used to indicate the pulse width level corresponding to each array in the binary sequence, and the pulse amplitude modulation information is used to indicate the pulse amplitude level corresponding to each array in the binary sequence.

[0016] The synchronization signal is pulse-modulated according to the pulse modulation information to obtain the modulated synchronization signal.

[0017] As one possible implementation, determining the pulse modulation information based on the binary sequence includes:

[0018] The binary sequence is divided into multiple arrays;

[0019] The pulse width level corresponding to each array is determined according to the first mapping relationship, which is used to indicate the correspondence between the array and the pulse width level;

[0020] The step of pulse modulating the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal includes:

[0021] The pulse modulation width of each synchronization pulse in the synchronization signal is determined based on the pulse width level corresponding to each array.

[0022] The synchronization signal is pulse-width modulated according to the pulse modulation width of each synchronization pulse to obtain the modulated synchronization signal.

[0023] As one possible implementation, determining the pulse modulation information based on the binary sequence includes:

[0024] The binary sequence is divided into multiple arrays;

[0025] The pulse amplitude level corresponding to each array is determined according to the second mapping relationship, which is used to indicate the correspondence between the array and the pulse amplitude level;

[0026] The step of pulse modulating the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal includes:

[0027] The pulse modulation amplitude of each synchronization pulse in the synchronization signal is determined based on the pulse amplitude level corresponding to each array.

[0028] The synchronization signal is pulse amplitude modulated according to the pulse modulation amplitude of each synchronization pulse to obtain the modulated synchronization signal.

[0029] As one possible implementation, the quantum signal generation module generates a quantum signal based on the signal parameters of the modulated synchronization signal, including:

[0030] The quantum signal generation module determines the transmission time slot of the modulated synchronization signal;

[0031] The quantum signal generation module generates the quantum signal during the transmission time slot.

[0032] Secondly, embodiments of this application provide a signal transmission and encryption integrated processing method applied to a receiving device, the receiving device comprising: a wave demultiplexer, a quantum signal recovery module, and a signal demodulation module, the method comprising:

[0033] The wavelength divider performs wavelength division processing on the mixed signal in the transmission medium to obtain a quantum signal and a modulated synchronization signal, and sends the quantum signal to the quantum signal recovery module and the modulated synchronization signal to the signal demodulation module.

[0034] The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal.

[0035] The quantum signal recovery module demodulates the quantum signal to obtain quantum information.

[0036] As one possible implementation, the signal demodulation module includes: a first rising edge detector, a pulse width timer, a first threshold comparator, and a first information decoder;

[0037] The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal, including:

[0038] The first rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, the pulse width timer is triggered to start timing to determine the pulse width of the synchronization pulse. The pulse width represents the time interval from the rising edge to the falling edge of the synchronization pulse. The modulated synchronization signal includes multiple synchronization pulses.

[0039] The first threshold comparator compares the pulse width of each synchronization pulse with a preset pulse width level to determine the pulse width level to which the pulse width of the synchronization pulse belongs.

[0040] The first information decoder demodulates each synchronization pulse according to the pulse width level to which the pulse width of each synchronization pulse belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

[0041] As one possible implementation, the signal demodulation module includes: a second rising edge detector, an amplitude sampler, a gain compensation unit, a second threshold comparator, and a second information decoder;

[0042] The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal, including:

[0043] The second rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, the amplitude sampler is triggered to start sampling to obtain the sampling amplitude of the synchronization pulse;

[0044] The gain compensation unit normalizes the sampling amplitude of each synchronization pulse to obtain the compensated pulse amplitude of each synchronization pulse.

[0045] The second threshold comparator compares the compensated pulse amplitude of each synchronization pulse with a preset pulse amplitude level to determine the pulse amplitude level to which the compensated pulse amplitude of the synchronization pulse belongs.

[0046] The second information decoder demodulates each synchronization pulse according to the pulse amplitude level to which the compensated pulse amplitude of each synchronization pulse belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

[0047] As one possible implementation, the quantum signal recovery module demodulates the quantum signal to obtain quantum information, including:

[0048] The quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the modulated synchronization signal to obtain the quantum information.

[0049] Thirdly, embodiments of this application provide a transmitting device, including: a synchronization signal generation module, a synchronization signal modulation module, a quantum signal generation module, and a multiplexer;

[0050] The transmitting device is used to perform the steps in the signal transmission and confidentiality processing method according to any one of the first aspects to transmit signals.

[0051] Fourthly, embodiments of this application provide a receiving device, including: a wavelength division multiplexer, a quantum signal recovery module, and a signal demodulation module;

[0052] The receiving device is used to perform the steps in the signal transmission and confidentiality integrated processing method according to any one of the second aspects to receive signals.

[0053] Fifthly, embodiments of this application provide a signal communication and security integrated processing system, including: the transmitting device described in the third aspect and the receiving device described in the fourth aspect.

[0054] 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.

[0055] According to the signal communication and encryption integrated processing method, transmitting device, receiving device, and system of this application, at the transmitting end, a synchronization signal is used as the carrier of classical communication information. Pulse modulation, including pulse width modulation and pulse amplitude modulation, is applied to the synchronization signal to embed classical communication information into the synchronization pulse, resulting in a modulated synchronization signal. This avoids the need to lay separate optical fibers for the classical channel. Simultaneously, the quantum signal and the modulated synchronization signal are combined and transmitted using wavelength division multiplexing (WDM), achieving dual-use of a single fiber and significantly saving optical fiber resources. At the receiving end, classical information is recovered by accurately demodulating the modulated synchronization signal, and quantum information is obtained by independently demodulating the quantum signal. The demodulation of quantum information and the demodulation of the modulated synchronization signal are isolated at both the physical and logical layers, preventing classical signals from interfering with the quantum state and ensuring the security of quantum communication. Furthermore, because the modulated synchronization signal itself also functions as a timing reference, the synchronization accuracy and anti-interference capability of the signal communication and encryption integrated processing system are further improved. Thus, by encoding classical communication information into a synchronization signal and transmitting it together with a quantum signal on a single optical fiber, this application effectively solves the problem of balancing the scarcity of optical fiber resources with the security of a unified communication and security system. Attached Figure Description

[0056] 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.

[0057] 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;

[0058] 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.

[0059] Figure 3 This paper shows a schematic diagram of the architecture of another integrated signal communication and confidentiality processing system provided in an embodiment of this application;

[0060] Figure 4 A schematic flowchart of a signal communication and confidentiality integrated processing method provided in an embodiment of this application is shown;

[0061] Figure 5 A schematic diagram of a synchronization signal provided in an embodiment of this application is shown;

[0062] Figure 6 A flowchart illustrating a synchronization signal modulation method provided in an embodiment of this application is shown;

[0063] Figure 7 A schematic diagram of a modulated synchronization signal provided in an embodiment of this application is shown;

[0064] Figure 8 A schematic diagram of another modulated synchronization signal provided in an embodiment of this application is shown;

[0065] Figure 9 A schematic flowchart of a signal demodulation method provided in an embodiment of this application is shown;

[0066] Figure 10 A flowchart illustrating another signal demodulation method provided in an embodiment of this application is shown. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0068] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0069] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0070] Figure 1 A schematic diagram of the architecture of a signal communication and encryption integrated processing system provided in an embodiment of this application is shown. (Refer to...) Figure 1As shown, the integrated signal transmission and reception processing system includes a transmitting device and a receiving device. The transmitting device includes a synchronization signal generation module, a synchronization signal modulation module, a quantum signal generation module, and a multiplexer. The receiving device includes a demultiplexer, a quantum signal recovery module, and a signal demodulation module.

[0071] Optionally, in the transmitting device, a synchronization signal generation module generates a synchronization signal and transmits it to a synchronization signal modulation module. The synchronization signal modulation module receives external communication signals and encodes the classical communication information carried by the communication signals into the synchronization signal through pulse modulation, forming a modulated synchronization signal, which is then sent to a multiplexer. Simultaneously, a quantum signal generation module generates a corresponding quantum signal based on the signal parameters of the modulated synchronization signal and sends the quantum signal to the multiplexer. Subsequently, the multiplexer performs multiplexing of the modulated synchronization signal and the quantum signal to generate a mixed signal, which is then transmitted to the receiving device via a single transmission medium, such as a single optical fiber; specifically, it is sent to a demultiplexer within the receiving device.

[0072] Optionally, in the receiving device, a wavelength division multiplexing (WDM) performs wavelength division processing on the mixed signal in the transmission medium, separating the quantum signal and the modulated synchronization signal. The quantum signal is then sent to the quantum signal recovery module, and the modulated synchronization signal is sent to the signal demodulation module. The signal demodulation module analyzes the pulse modulation information of the modulated synchronization signal, demodulates and extracts the classical communication information carried by the communication signal, ensuring accurate recovery of the classical communication information. Simultaneously, the quantum signal recovery module demodulates the quantum signal to recover the quantum information, ensuring the security and confidentiality of the communication.

[0073] Optionally, the transmitting device further includes a communication signal generation module, used to generate a communication signal and transmit it to the synchronization signal modulation module. The communication signal generation module, as the information source, is responsible for generating a communication signal carrying classical communication information, ensuring the accuracy and integrity of the classical communication information. After receiving the communication signal sent by the communication signal generation module, the synchronization signal modulation module encodes the classical communication information in the communication signal into the synchronization signal using pulse modulation technology, forming a modulated synchronization signal. This achieves an effective combination of classical communication information and the synchronization signal.

[0074] Since this application provides two pulse modulation methods, including pulse width modulation and pulse amplitude modulation, two different signal demodulation modules are designed accordingly for different pulse modulation methods to demodulate the modulated synchronization signals obtained by different pulse modulation methods. The signal demodulation modules in the two cases are described in detail below.

[0075] Optionally, refer to Figure 2As shown, the signal demodulation module includes a first rising edge detector, a pulse width timer, a first threshold comparator, and a first information decoder. These components work together to demodulate the modulated synchronization signal, specifically referring to pulse width demodulation. Specifically, the first rising edge detector first detects the rising edge of each synchronization pulse in the modulated synchronization signal and triggers the pulse width timer to start timing, thus determining the pulse width of each synchronization pulse. The first threshold comparator compares the pulse width of each synchronization pulse with a preset pulse width level to determine its corresponding level. The first information decoder demodulates the modulated synchronization signal according to the pulse width level of each synchronization pulse, thereby accurately extracting the classic communication information carried by the communication signal.

[0076] Optionally, refer to Figure 3 As shown, the signal demodulation module includes a second rising edge detector, an amplitude sampler, a gain compensation unit, a second threshold comparator, and a second information decoder. These components work together to demodulate the modulated synchronization signal, specifically referring to pulse amplitude demodulation. Specifically, the second rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal and triggers the amplitude sampler to start sampling when a rising edge is detected, acquiring the sampled amplitude of each synchronization pulse. Next, the gain compensation unit normalizes these sampled amplitudes to obtain compensated pulse amplitudes, eliminating amplitude distortion that may be introduced during transmission. The second threshold comparator compares the compensated pulse amplitude with a preset pulse amplitude level to determine its corresponding amplitude level. The second information decoder demodulates the signal according to the compensated pulse amplitude level of each synchronization pulse, thereby accurately recovering the classic communication information carried by the communication signal.

[0077] It is worth noting that, based on the aforementioned two different signal demodulation module structures, this application can implement two demodulation methods based on pulse width modulation and pulse amplitude modulation. This not only improves the accuracy and reliability of signal demodulation but also enhances the anti-interference capability of the integrated signal communication processing system, ensuring high-fidelity recovery of classical communication information in complex transmission environments. Furthermore, the signal demodulation module can effectively cope with various interferences and attenuations during signal transmission, guaranteeing the accuracy and integrity of classical communication information and providing solid technical support for the entire integrated signal communication processing system.

[0078] Based on this, according to the signal-to-quantum integrated processing system provided in the embodiments of this application, the transmitting device uses a synchronization signal as a carrier and encodes classical communication information into the synchronization signal through pulse width modulation or pulse amplitude modulation. The resulting modulated synchronization signal is then combined with the quantum signal by a multiplexer and transmitted to the receiving device. The receiving device, through precise rising edge detection, pulse width / amplitude sampling, gain compensation, and threshold comparison mechanisms, achieves high-precision demodulation of the classical communication information while independently recovering the quantum information, ensuring the real-time performance and security of the communication. Thus, the signal-to-quantum integrated processing system of this application, by co-transmitting classical and quantum signals in the same transmission medium, not only achieves efficient and secure fusion communication of classical and quantum information, but also saves optical fiber transmission resources during signal processing. Furthermore, the optimization of the modulation and demodulation mechanism improves anti-interference capabilities and signal recovery accuracy, solving the resource waste, synchronization difficulties, and transmission security problems caused by the separation of classical and quantum signal transmission in traditional systems.

[0079] The following is in conjunction with the above. Figures 1 to 3 The contents described in the signal communication and security integrated processing system shown herein will be explained in detail for the signal communication and security integrated processing method provided in the embodiments of this application.

[0080] Figure 4 This paper illustrates a flowchart of a signal communication and confidentiality integrated processing method provided in an embodiment of this application. The main implementers of this method are the transmitting device and the receiving device in the aforementioned signal communication and confidentiality integrated processing system. (Refer to...) Figure 4 As shown, the method specifically includes the following steps:

[0081] S401, Synchronization signal generation module generates synchronization signal.

[0082] Optionally, a synchronization signal is used to provide a time reference, ensuring that the transmitting and receiving devices are synchronized in time, with reference to... Figure 5 As shown, the synchronization signal is a pulse sequence containing multiple synchronization pulses. The synchronization signal generation module is typically driven by a high-precision master clock to generate the synchronization signal. Specifically, the master clock signal generates synchronization pulses of the required frequency through a digital frequency divider, and then uses programmable logic to generate a periodic pulse sequence with a fixed period, stable frequency, and consistent phase as the synchronization signal. Furthermore, the signal parameters of the synchronization signal, such as duty cycle, rise / fall time, and frequency, need to meet the timing matching requirements of subsequent synchronization signal modulation and quantum signal generation to ensure that all modules in the integrated signal processing system are synchronized in time, achieving high reliability and high precision in hybrid signal transmission.

[0083] S402, The synchronization signal generation module sends the synchronization signal to the synchronization signal modulation module.

[0084] Optionally, the synchronization signal generation module can transmit the generated synchronization signal to the synchronization signal modulation module via an electrical connection between the synchronization signal generation module and the synchronization signal modulation module. It is worth noting that the transmission path of the synchronization signal needs to be shielded from interference to ensure the integrity of the synchronization signal and avoid the introduction of jitter.

[0085] S403, The communication signal generation module generates communication signals.

[0086] Optionally, the communication signal is a signal carrying classical communication information, usually in the form of an electrical signal or an optical signal, used for protocol interaction and information transmission between the transmitting and receiving ends. The communication signal generation module is usually implemented by a field-programmable gate array (FPGA), microcontroller, or embedded processor to generate the communication signal, thereby obtaining the communication signal carrying the classical communication information to be transmitted.

[0087] S404, The communication signal generation module sends the communication signal to the synchronization signal modulation module.

[0088] Optionally, the communication signal generation module can transmit the generated communication signal to the synchronization signal modulation module via an electrical connection between the communication signal generation module and the synchronization signal modulation module. It is worth noting that, similarly, the transmission path of the communication signal needs to be shielded from interference to ensure the integrity of the communication signal and avoid the introduction of jitter.

[0089] S405, The synchronization signal modulation module performs pulse modulation on the synchronization signal according to the communication signal, so as to encode the classic communication information carried by the communication signal into the synchronization signal, and obtain the modulated synchronization signal.

[0090] Optionally, the synchronization signal modulation module performs pulse modulation on the synchronization signal according to the communication signal, that is, it encodes the classic communication information carried by the communication signal into the synchronization signal through pulse modulation. In this embodiment, the synchronization signal modulation module supports two pulse modulation methods, including pulse width modulation (PWM) and pulse amplitude modulation (PAM), where pulse width modulation indicates that different pulse widths represent different data, and pulse amplitude modulation indicates that different amplitudes represent different data.

[0091] Optionally, after receiving the communication signal generated and transmitted by the communication signal generation module, the synchronization signal modulation module performs pulse modulation on the synchronization signal by mapping the classical communication information carried by the communication signal to modulation parameters, thereby obtaining the modulated synchronization signal. Specifically, mapping the classical communication information to modulation parameters includes: if it is pulse width modulation, mapping each bit or data segment to a specific pulse width; if it is pulse amplitude modulation, mapping the classical communication information to different voltage levels.

[0092] S406, the synchronization signal modulation module sends the modulated synchronization signal to the combiner.

[0093] Optionally, a multiplexer is a device that can combine multiple signals of different wavelengths or types into the same transmission medium. After the synchronization signal modulation module generates a modulated synchronization signal, the modulated synchronization signal can be sent to the input port of the multiplexer through the electrical connection between the synchronization signal modulation module and the multiplexer. During the transmission of the modulated synchronization signal, impedance matching and signal fidelity must be ensured.

[0094] S407, The quantum signal generation module generates a quantum signal based on the signal parameters of the modulated synchronization signal.

[0095] Optionally, the quantum signal generation module uses key signal parameters of the modulated synchronization signal (such as pulse rise time, period, and phase) as a time reference to generate the quantum signal within a precisely corresponding time slot. For example, triggered by the rising edge of each synchronization pulse, the quantum signal generation module generates a photon encoded with quantum information, ensuring that the quantum signal and the classical signal are strictly aligned in time, facilitating synchronization recovery at the receiving end. It is worth noting that the generation of the quantum signal by the quantum signal generation module, the generation of the synchronization signal by the synchronization signal generation module, and the generation of the communication signal by the communication generation module are all independent steps, and their execution order is not restricted.

[0096] S408, the quantum signal generation module sends the quantum signal to the multiplexer.

[0097] Optionally, the quantum signal generation module sends the quantum signal into the multiplexer through an independent optical path, so that the multiplexer combines the quantum signal with the modulated synchronization signal on different wavelength channels to form a hybrid signal that can be transmitted in a single optical fiber.

[0098] S409, the combiner performs a multiplexing process on the quantum signal and the modulated synchronization signal to obtain a mixed signal.

[0099] Optionally, the multiplexer integrates signals from different paths, receiving both the modulated synchronization signal and the quantum signal, and combining these two signals of different wavelengths and types into the same output port to form a mixed signal containing both quantum and classical information, thus enabling multi-signal co-fiber transmission.

[0100] The S410 multiplexer sends a mixed signal to the demultiplexer via a single transmission medium.

[0101] Optionally, the transmission medium may be, for example, optical fiber. After being processed by a multiplexer, the quantum signal and the modulated synchronization signal are combined into a hybrid signal. The multiplexer can then use a single optical fiber to transmit the hybrid signal to a demultiplexer in the receiving device. This integrated transmission method saves optical fiber resources, improves system integration, and can be widely applied in quantum key distribution systems and classical communication co-fiber systems.

[0102] S411, the wave demultiplexer performs wave demultiplexing on the mixed signal in the transmission medium to obtain the quantum signal and the modulated synchronization signal.

[0103] Optionally, at the receiving end, the wavelength divider separates the mixed signal in the transmission medium according to the wavelength, separating the quantum signal into the quantum channel and the modulated synchronization signal into the classical channel. During the wavelength division process of the mixed signal, the wavelength divider can ensure that the two types of signals do not interfere with each other and enter their respective processing paths based on wavelength selectivity.

[0104] S412, the demultiplexer sends the quantum signal to the quantum signal recovery module.

[0105] Optionally, the demultiplexer sends the separated quantum signal to the quantum signal recovery module for subsequent quantum state measurement and decoding.

[0106] S413, the demultiplexer sends the modulated synchronization signal to the signal demodulation module.

[0107] Optionally, the demultiplexer sends the separated modulated synchronization signal to the signal demodulation module, so that the signal demodulation module can analyze the time structure and signal characteristics of the modulated synchronization signal, and provide raw data for subsequent classical communication information demodulation.

[0108] S414 The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

[0109] Optionally, based on the above explanation of the signal demodulation module in the integrated signal communication and encryption processing system, this application provides two pulse modulation methods, and correspondingly provides two signal demodulation modules with different structures to process the two pulse modulation methods respectively. One type of signal demodulation module includes a first rising edge detector, a pulse width timer, a first threshold comparator, and a first information decoder. In this case, the first rising edge detector in the signal demodulation module can detect the rising edge of each synchronization pulse, combined with... Figure 5As shown, the pulse width timer starts counting from the rising edge and stops at the falling edge to determine the pulse width. Then, the first threshold comparator compares the obtained pulse width with a preset pulse width level to determine the appropriate pulse width level and converts it into the original bit stream to recover the communication signal and obtain the classic communication information carried by the communication signal. Alternatively, the signal demodulation module includes a second rising edge detector, an amplitude sampler, a gain compensation unit, a second threshold comparator, and a second information decoder. In this case, the second rising edge detector in the signal demodulation module can detect the rising edge of each synchronization pulse and trigger the amplitude sampler to sample when a rising edge is detected. The gain compensation unit normalizes the sampled value to obtain a normalized amplitude. Then, the second threshold comparator compares the obtained normalized amplitude with a preset amplitude level to determine the appropriate amplitude level and converts it into the original bit stream to recover the communication signal and obtain the classic communication information carried by the communication signal.

[0110] S415, the quantum signal recovery module demodulates the quantum signal to obtain quantum information.

[0111] Optionally, the quantum signal recovery module detects and measures the quantum signal within the correct time window based on a time reference obtained from the modulated synchronization signal, such as the transmission time slot. For example, the quantum signal recovery module selects the correct basis for polarization or phase measurement based on the rising edge of each synchronization pulse in the modulated synchronization signal, ultimately decoding the quantum information. In this way, high-precision time synchronization is achieved using the rising edge of the modulated synchronization signal as a reference, ensuring the accuracy of quantum state measurement.

[0112] Based on this, the signal-communication-security integrated processing method according to the embodiments of this application utilizes a synchronization signal as the carrier of classical communication information at the transmitting end. Pulse modulation is employed to modulate the synchronization signal, including pulse width modulation and pulse amplitude modulation, thereby embedding classical communication information into the synchronization pulse to obtain a modulated synchronization signal, avoiding the need to lay separate optical fibers for the classical channel. Simultaneously, the quantum signal and the modulated synchronization signal are combined and transmitted via wavelength division multiplexing (WDM), achieving dual-use on a single fiber and significantly saving optical fiber resources. At the receiving end, classical information is recovered by accurately demodulating the modulated synchronization signal, and quantum information is obtained by independently demodulating the quantum signal. Furthermore, the demodulation of quantum information and the demodulation of the modulated synchronization signal are isolated at both the physical and logical layers, preventing classical signals from interfering with the quantum state and ensuring the security of quantum communication. Since the modulated synchronization signal itself also functions as a timing reference, the synchronization accuracy and anti-interference capability of the signal-communication-security integrated processing system are further improved. Thus, by encoding classical communication information into the synchronization signal and transmitting it along with the quantum signal on a single optical fiber, this application effectively solves the problem of balancing the scarcity of optical fiber resources with the security of the integrated communication-security system.

[0113] Figure 6 A schematic flowchart of a synchronization signal modulation method provided in an embodiment of this application is shown. (Refer to...) Figure 6 As shown, in step S405 above, the synchronization signal modulation module receives the communication signal and performs pulse modulation on the synchronization signal according to the communication signal to encode the classical communication information carried by the communication signal into the synchronization signal, thereby obtaining the modulated synchronization signal. Specifically, this includes the following steps:

[0114] S601, the synchronization signal modulation module receives the communication signal sent by the communication signal generation module, performs binary encoding on the classic communication information carried by the communication signal, and obtains the binary sequence corresponding to the classic communication information.

[0115] Optionally, the communication signal sent from the communication signal generation module to the synchronization signal modulation module is generally a modulated original communication signal, such as amplitude modulation, phase modulation, or frequency modulation. Therefore, after receiving the communication signal, the synchronization signal modulation module needs to rely on a corresponding demodulation method to extract the classical communication information. This demodulation method depends on whether the communication signal generation module used amplitude modulation to modulate the original communication signal. Specifically, if the original communication signal uses amplitude modulation, the synchronization signal modulation module can recover the classical communication information by detecting changes in the amplitude of the communication signal. If the original communication signal uses frequency modulation, the synchronization signal modulation module can recover the classical communication information by detecting changes in the frequency of the communication signal. If the original communication signal uses phase modulation, the synchronization signal modulation module can recover the classical communication information by detecting changes in the phase of the communication signal.

[0116] Optionally, if the extracted classical communication information is an analog signal, it needs to be quantized first. This involves mapping continuous signal values ​​to a set of discrete values, and then, according to a predetermined mapping rule (e.g., a voltage range corresponding to 0 or 1), mapping the quantization result to binary numbers. The binary sequence corresponding to the classical communication information is, for example, 10110001. Furthermore, to improve data transmission efficiency or enhance anti-interference capabilities, additional encoding operations can be performed on the received data, such as differential coding or Manchester coding.

[0117] S602. Determine the pulse modulation information based on the binary sequence.

[0118] Optionally, the pulse modulation information is an encoding rule that maps a binary sequence to physical pulse characteristics (width or amplitude). It determines which pulse width level or pulse amplitude level should be used to represent each data unit (such as an array), thereby achieving reliable transmission of digital information over analog pulse signals. The pulse modulation information includes either pulse width modulation information or pulse amplitude modulation information. The pulse width modulation information indicates the pulse width level corresponding to each array in the binary sequence, and the pulse amplitude modulation information indicates the pulse amplitude level corresponding to each array in the binary sequence.

[0119] Optionally, when the pulse modulation information is pulse width modulation information, the above step S602 determines the pulse modulation information based on the binary sequence, including: dividing the binary sequence to obtain multiple arrays, and determining the pulse width level corresponding to each array according to the first mapping relationship.

[0120] For example, in this embodiment of the application, the binary sequence can be divided into two arrays corresponding to two bits. Continuing with the binary sequence 10110001 as an example, dividing the entire binary sequence into groups of two bits yields four arrays: 10, 11, 00, and 01. Based on this, the pulse width level corresponding to each array can be further determined according to the first mapping relationship.

[0121] For example, the first mapping relationship is used to indicate the correspondence between the array and the pulse width level, and the first mapping relationship can be specifically shown in Table 1 below:

[0122] Table 1. Schematic diagram of the first mapping relationship

[0123]

[0124] It is worth noting that, since the period of the quantum signal is 10 μs, it is necessary to ensure that the pulse width modulation signal matches the basic order of the quantum signal. This means that within each 10 μs period, one or more pulses can be placed, with a total width not exceeding 10 μs. For example, a 6 μs pulse can be placed in the first 10 μs period, an 8 μs pulse in the second 10 μs period, and so on.

[0125] Furthermore, based on the first mapping relationship shown in Table 1 above, a corresponding pulse width modulation (PWM) signal can be generated. This PWM signal is a series of pulses with different widths, which is also a form of the modulated synchronization signal. Based on this, by dividing the binary sequence and applying the first mapping relationship, classical communication information can be efficiently encoded into the pulse width, achieving synchronous transmission with quantum signals. This not only improves data transmission efficiency but also ensures the independence and integrity of classical and quantum information.

[0126] Optionally, when the pulse modulation information is pulse amplitude modulation information, step S602 above determines the pulse modulation information based on the binary sequence, including: dividing the binary sequence to obtain multiple arrays, and determining the pulse amplitude level corresponding to each array according to the second mapping relationship.

[0127] For example, in this embodiment of the application, the binary sequence can be divided into two arrays corresponding to two bits. Continuing with the binary sequence 10110001 as an example, dividing the entire binary sequence into groups of two bits yields four arrays: 10, 11, 00, and 01. Based on this, the pulse amplitude level corresponding to each array can be further determined according to the second mapping relationship.

[0128] For example, the second mapping relationship is used to indicate the correspondence between the array and the pulse amplitude level, and the second mapping relationship is specifically shown in Table 2 below:

[0129] Table 2. Schematic diagram of the second mapping relationship.

[0130]

[0131] It is worth noting that the range of pulse amplitude levels should be controlled within the threshold that does not cause crosstalk to the quantum signal, while ensuring that it is within the linear operating range of the classical channel to guarantee demodulation stability.

[0132] Furthermore, based on the second mapping relationship shown in Table 2 above, a corresponding pulse amplitude modulation signal can be generated. This pulse amplitude modulation signal is a series of pulses with different widths, which is another form of the modulated synchronization signal. Based on this, by dividing the binary sequence and applying the second mapping relationship, classical communication information can be efficiently encoded into the pulse amplitude, achieving synchronous transmission with quantum signals. This not only improves data transmission efficiency but also ensures the independence and integrity of classical and quantum information.

[0133] S603. The synchronization signal is pulse modulated according to the pulse modulation information to obtain the modulated synchronization signal.

[0134] Optionally, when the pulse modulation information is pulse amplitude modulation information, step S603 above modulates the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal, including: determining the pulse modulation amplitude of each synchronization pulse in the synchronization signal according to the pulse amplitude level corresponding to each array, and modulating the synchronization signal according to the pulse amplitude of each synchronization pulse to obtain the modulated synchronization signal.

[0135] For example, refer to Figure 7As shown, the original synchronization signal is a series of rectangular pulses of equal width and period. After pulse amplitude modulation, the pulse amplitude changes, while the pulse width and period remain unchanged. Thus, classical communication information can be encoded by changing the pulse amplitude of the synchronization signal.

[0136] For example, based on the second mapping relationship shown in Table 2 above, the pulse amplitude level corresponding to each array can be determined, meaning that each binary array will be converted into a specific pulse amplitude value. For example, array 00 corresponds to a minimum amplitude level of 50mV, while array 11 corresponds to a maximum amplitude level of 200mV. Further, according to the determined pulse amplitude level, a corresponding pulse modulation amplitude is assigned to each synchronization pulse in the synchronization signal; that is, the amplitude of each synchronization pulse is set to the value specified by its corresponding pulse amplitude level. This ensures that each synchronization pulse carries specific information. Finally, according to the pulse modulation amplitude of each synchronization pulse, pulse amplitude modulation is performed on the synchronization signal. Specifically, information is encoded by changing the amplitude of each pulse in the synchronization signal, thus obtaining the modulated synchronization signal. This modulated synchronization signal contains both the original synchronization function and carries additional encoded information.

[0137] Optionally, when the pulse modulation information is pulse width modulation information, step S603 above modulates the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal, including: determining the pulse modulation width of each synchronization pulse in the synchronization signal according to the pulse width level corresponding to each array, and performing pulse width modulation on the synchronization signal according to the pulse modulation width of each synchronization pulse to obtain the modulated synchronization signal.

[0138] For example, refer to Figure 8 As shown, the original synchronization signal is also a series of rectangular pulses of equal width and period. However, after pulse amplitude modulation, the pulse width changes, while the pulse amplitude and period remain unchanged. Thus, classic communication information can be encoded by changing the pulse width of the synchronization signal.

[0139] For example, based on the first mapping relationship shown in Table 1 above, the pulse width level corresponding to each array can be determined, meaning that each binary array will be converted into a specific pulse width value. For example, array 00 corresponds to a minimum width level of 2μs, while array 11 corresponds to a maximum width level of 8μs. Further, according to the determined pulse width level, a corresponding pulse modulation width is assigned to each synchronization pulse in the synchronization signal; that is, the width of each synchronization pulse is set to the value specified by its corresponding pulse width level. This ensures that each synchronization pulse carries specific information. Finally, according to the pulse modulation width of each synchronization pulse, pulse width modulation is performed on the synchronization signal. Specifically, information is encoded by changing the width of each pulse in the synchronization signal, thus obtaining the modulated synchronization signal. This modulated synchronization signal contains both the original synchronization function and carries additional encoded information.

[0140] It is worth noting that, in the above process, considering the pulse width drift that may be caused by channel noise, a method that allows for a certain amount of error is adopted to enhance the robustness of the system. For example, if the preset pulse width is 6μs and an error of ±0.5μs is allowed, then the actual received pulse width between 5.5μs and 6.5μs is still considered to belong to the same pulse width level, thereby effectively reducing the impact of noise on signal decoding. It should be understood that the above error handling method can also be applied to pulse amplitude, which will not be elaborated here.

[0141] Based on this, by dividing the binary sequence into arrays and converting them into corresponding pulse levels according to a preset mapping relationship, pulse modulation is applied to the synchronization signal, achieving efficient and reliable encoded transmission of classic communication information on the synchronization signal. Correspondingly, during demodulation, by comparing the measured pulse amplitude with the preset level and introducing an allowable error tolerance, the tolerance to channel noise, signal attenuation, and timing jitter is effectively improved, avoiding misjudgments due to minor fluctuations, thereby significantly enhancing the stability of signal identification and the accuracy of demodulation.

[0142] As one possible implementation, step S407, where the quantum signal generation module generates a quantum signal based on the signal parameters of the modulated synchronization signal, includes: the quantum signal generation module determining the transmission time slot of the modulated synchronization signal and generating a quantum signal in the transmission time slot.

[0143] For example, the quantum signal generation module can detect the rising edge of each synchronization pulse in the modulated synchronization signal using a high-speed comparator to determine the accurate time position of the transmission time slot. For instance, if the modulated synchronization signal transmits a pulse every 1ms, then the rising edge of each pulse is a transmission time slot, and the quantum signal will be triggered to be generated at the rising edge.

[0144] For example, quantum signals are typically photons encoded with quantum information; that is, quantum state encoding is required simultaneously with photon generation. Common encoding methods include polarization encoding, phase encoding, and time encoding. The quantum signal generation module may contain a time controller, which generates a controllable trigger signal based on the rising edge of the synchronization pulse in the modulated synchronization signal, ensuring that the quantum signal is generated within the correct time window.

[0145] Based on this, the modulated synchronization signal contains multiple synchronization pulses. The rising edge start time corresponding to the rising edge of each synchronization pulse can be used as the transmission time slot. This transmission time slot serves as a time marker to indicate when the quantum signal should be generated. The quantum signal generation module identifies the transmission time slot and accurately generates the quantum state at the corresponding time, thereby ensuring that the quantum signal and the synchronization signal are strictly aligned in time.

[0146] Figure 9 A schematic flowchart of a signal demodulation method provided in an embodiment of this application is shown. (Refer to...) Figure 9 As shown, in step S414 above, the signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal. Specifically, it includes the following steps:

[0147] S901, the first rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, triggers the pulse width timer to start timing to determine the pulse width of the synchronization pulse.

[0148] For example, refer to Figure 5 As shown, the pulse width specifically represents the time interval from the start of the rising edge to the start of the falling edge of the synchronization pulse, which is also the duration of the high level. The modulated synchronization signal includes multiple synchronization pulses.

[0149] For example, the first rising edge detector is responsible for accurately identifying the start time of each synchronization pulse in the modulated synchronization signal. When a rising edge is detected, transitioning from a low level to a high level, the pulse width timer is immediately triggered to start timing. The pulse width timer continues to run until the pulse falls back to a low level, thereby accurately measuring the pulse width. Since the modulated synchronization signal contains multiple periodically arranged pulses, the width of each pulse has been encoded by the transmitting end according to classical communication information, such as different widths representing different bit combinations. The coordinated operation of the first rising edge detector and the pulse width timer enables the extraction of the pulse width parameter, a key modulation feature, from the physical signal, laying the foundation for subsequent reconstruction of classical communication information.

[0150] S902, The first threshold comparator compares the pulse width of each synchronization pulse with a preset pulse width level to determine the pulse width level to which the pulse width of the synchronization pulse belongs.

[0151] For example, the first threshold comparator receives the actual pulse width of each synchronization pulse measured by the pulse width timer and compares it with a preset pulse width level. This preset width level is a discretized standard value agreed upon in advance by the transmitting and receiving devices. By setting a reasonable judgment interval, such as allowing a tolerance of ±0.5μs, the first threshold comparator classifies the measured pulse width into the closest pulse width level, thereby determining the logical symbol represented by the pulse. In this way, not only is the conversion from continuous physical quantities to discrete digital states achieved, but also the slight pulse width drift caused by jitter, attenuation, or interference during channel transmission is effectively suppressed, improving the robustness and decision accuracy of the integrated signal transmission and reception processing system.

[0152] S903, the first information decoder demodulates each synchronization pulse according to the pulse width level to which the pulse width of each synchronization pulse belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

[0153] For example, the first information decoder performs reverse decoding according to the pulse width level of each pulse as determined above, following the first mapping relationship. For instance, if the pulse width level of a pulse is determined to be 6μs, the first information decoder outputs the corresponding binary array 10; if the pulse width level of a pulse is determined to be 8μs, the first information decoder outputs the corresponding binary array 11, and so on. By decoding all pulses one by one and splicing them together in chronological order, the complete original binary sequence is finally restored, which is the classic communication information carried by the communication signal.

[0154] Based on this, this application utilizes rising edge-triggered timing to ensure the accuracy of time measurement, and combines it with tolerance-based threshold comparison to effectively resist channel noise and timing jitter. Furthermore, decoding through a pre-defined mapping relationship ensures the unambiguous restoration of classical communication information. Thus, it not only improves the transmission stability of classical communication information in complex environments but also achieves efficient resource reuse and precise time synchronization when transmitting with quantum signals on the same fiber.

[0155] Figure 10 A schematic flowchart of another signal demodulation method provided in an embodiment of this application is shown. (Refer to...) Figure 10 As shown, in step S414 above, the signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal. Specifically, it includes the following steps:

[0156] S1001, the second rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, the amplitude sampler is triggered to start sampling to obtain the sampling amplitude of the synchronization pulse.

[0157] For example, the second rising edge detector is responsible for accurately identifying the start time of each synchronization pulse in the modulated synchronization signal, and once a rising edge is detected, it immediately triggers the amplitude sampler to sample the amplitude of the current pulse to ensure the acquisition of the most stable amplitude value. It is worth noting that since the modulated synchronization signal is pulse amplitude modulated, the amplitude of each pulse has been encoded into different levels to represent specific binary information. Therefore, accurate detection of the rising edge and timely sampling are prerequisites for correctly reconstructing the information.

[0158] S1002, the gain compensation unit normalizes the sampling amplitude of each synchronization pulse to obtain the compensated pulse amplitude of each synchronization pulse.

[0159] For example, the gain compensation unit normalizes the sampling amplitude of each received synchronization pulse to eliminate overall amplitude variations caused by factors such as channel attenuation, temperature drift, or light source fluctuations during transmission. Specifically, the gain compensation unit can introduce a reference signal, such as the pilot pulse or historical average value in the modulated synchronization signal, to proportionally scale the measured amplitude and restore it to the compensated pulse amplitude within the standard range, thereby achieving normalization of the sampling amplitude. It is worth noting that the normalization process not only ensures that the signal amplitude in different time periods and environments still accurately corresponds to the preset level, but also significantly improves the system's stability and demodulation reliability under dynamic channel conditions.

[0160] S1003, the second threshold comparator compares the compensated pulse amplitude of each synchronization pulse with a preset pulse amplitude level to determine the pulse amplitude level to which the compensated pulse amplitude of the synchronization pulse belongs.

[0161] For example, the second threshold comparator compares the gain-compensated amplitude of each pulse with a preset pulse amplitude level to determine its corresponding pulse amplitude level. Further, the second threshold comparator determines the sign represented by the pulse based on the pulse amplitude level to which the compensated amplitude value belongs. This process allows for a certain tolerance range to prevent misjudgments caused by minor fluctuations.

[0162] S1004 The second information decoder demodulates each synchronization pulse according to the pulse amplitude level to which the compensated pulse amplitude belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

[0163] For example, the second information decoder performs reverse decoding based on the pulse amplitude level of each pulse as determined above, according to a pre-agreed second mapping relationship. For instance, if the pulse amplitude level of a pulse is determined to be 50mA, the first information decoder outputs the corresponding binary array 00; if the pulse amplitude level of a pulse is determined to be 150mA, the first information decoder outputs the corresponding binary array 10, and so on. By decoding all pulses in chronological order and then concatenating them into a complete binary sequence, the classic communication information carried by the original communication signal is obtained.

[0164] Based on this, this application utilizes rising edge detection to ensure accurate sampling timing, effectively eliminates amplitude drift caused by channel attenuation through gain compensation, and enhances noise immunity through threshold comparison combined with a tolerance mechanism, ultimately mapping and decoding to restore classic communication information. Thus, it not only supports multi-level modulation to improve data transmission efficiency but also significantly enhances the system's adaptability and stability in long-distance, variable-loss environments.

[0165] As one possible implementation, step S415, where the quantum signal recovery module demodulates the quantum signal to obtain quantum information, includes: the quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the modulated synchronization signal to obtain quantum information.

[0166] For example, the modulated synchronization signal is a pulse sequence containing multiple synchronization pulses, and the transmission time slot of the modulated synchronization signal refers to the time corresponding to the rising edge of the synchronization pulse, combined with... Figure 7 and Figure 8 As shown, each synchronization pulse in the pulse sequence has a distinct rising edge, and the starting time of this rising edge can be used as a time reference point to represent the transmission time slot. In this embodiment, the quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the modulated synchronization signal, that is, it uses the starting time of the rising edge of the synchronization pulse as the time reference point, and distinguishes between rising edges to ensure that the rising edge of the synchronization pulse in the modulated synchronization signal serves as the quantum state marking reference, thus ensuring the synchronization reference of the quantum signal.

[0167] For example, the first rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal and sends the starting time of the rising edge corresponding to the rising edge of the synchronization pulse as the transmission time slot to the quantum signal recovery module. After receiving the quantum signal, the quantum signal recovery module uses the rising edges of each synchronization pulse in the pulse sequence of the modulated synchronization signal for time alignment. For example, whenever a rising edge is detected, the quantum signal recovery module aligns its internal clock with the rising edge to ensure that the subsequent quantum signal demodulation operation can be performed within the correct time window, thereby effectively eliminating the effects of clock drift and transmission delay.

[0168] 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.

[0169] Based on this, embodiments of this application provide a method for assisting in the demodulation of quantum signals using the rising edge of a modulated synchronization signal. The quantum signal recovery module utilizes the rising edges of each synchronization pulse in the modulated synchronization signal as a time reference to ensure that the quantum signal is demodulated and read at the correct time point. The modulated synchronization signal consists of multiple synchronization pulses, each rising edge marking a specific time point. These time points are used to label quantum states, 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.

[0170] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the method steps of the integrated signal communication and confidentiality processing method described in any of the preceding claims.

[0171] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0172] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the functions are implemented as 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 solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0173] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A signal transmission and encryption integrated processing method, characterized in that, The method is applied to a transmitting device, the transmitting device comprising: a synchronization signal generation module, a synchronization signal modulation module, a quantum signal generation module, and a combiner, the method comprising: The synchronization signal generation module generates a synchronization signal and sends the synchronization signal to the synchronization signal modulation module; The synchronization signal modulation module receives the communication signal and performs pulse modulation on the synchronization signal according to the communication signal to encode the classical communication information carried by the communication signal into the synchronization signal to obtain the modulated synchronization signal. The synchronization signal modulation module sends the modulated synchronization signal to the multiplexer. The quantum signal generation module generates a quantum signal based on the signal parameters of the modulated synchronization signal, and sends the quantum signal to the multiplexer; The combiner performs a multiplexing process on the quantum signal and the modulated synchronization signal to obtain a mixed signal, and then transmits the mixed signal to the receiving device through a single transmission medium. The transmitting device further includes: a communication signal generation module; The communication signal generation module generates the communication signal and sends the communication signal to the synchronization signal modulation module; The synchronization signal modulation module receives a communication signal and performs pulse modulation on the synchronization signal according to the communication signal to encode the classical communication information carried by the communication signal into the synchronization signal, thereby obtaining a modulated synchronization signal, including: The synchronization signal modulation module receives the communication signal sent by the communication signal generation module, performs binary encoding on the classic communication information carried by the communication signal, and obtains the binary sequence corresponding to the classic communication information; Based on the binary sequence, pulse modulation information is determined, which includes pulse width modulation information or pulse amplitude modulation information. The pulse width modulation information is used to indicate the pulse width level corresponding to each array in the binary sequence, and the pulse amplitude modulation information is used to indicate the pulse amplitude level corresponding to each array in the binary sequence. The synchronization signal is pulse-modulated according to the pulse modulation information to obtain the modulated synchronization signal.

2. The method according to claim 1, characterized in that, Determining the pulse modulation information based on the binary sequence includes: The binary sequence is divided into multiple arrays; The pulse width level corresponding to each array is determined according to the first mapping relationship, which is used to indicate the correspondence between the array and the pulse width level; The step of pulse modulating the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal includes: The pulse modulation width of each synchronization pulse in the synchronization signal is determined based on the pulse width level corresponding to each array. The synchronization signal is pulse-width modulated according to the pulse modulation width of each synchronization pulse to obtain the modulated synchronization signal.

3. The method according to claim 1, characterized in that, Determining the pulse modulation information based on the binary sequence includes: The binary sequence is divided into multiple arrays; The pulse amplitude level corresponding to each array is determined according to the second mapping relationship, which is used to indicate the correspondence between the array and the pulse amplitude level; The step of pulse modulating the synchronization signal according to the pulse modulation information to obtain the modulated synchronization signal includes: The pulse modulation amplitude of each synchronization pulse in the synchronization signal is determined based on the pulse amplitude level corresponding to each array. The synchronization signal is pulse amplitude modulated according to the pulse modulation amplitude of each synchronization pulse to obtain the modulated synchronization 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 modulated synchronization signal, including: The quantum signal generation module determines the transmission time slot of the modulated synchronization signal; The quantum signal generation module generates the quantum signal during the transmission time slot.

5. 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, 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 modulated synchronization signal, and sends the quantum signal to the quantum signal recovery module and the modulated synchronization signal to the signal demodulation module. The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classic communication information carried by the communication signal from the modulated synchronization signal. The pulse modulation information includes pulse width modulation information or pulse amplitude modulation information. The pulse width modulation information is used to indicate the pulse width level corresponding to each array in the binary sequence corresponding to the classic communication information, and the pulse amplitude modulation information is used to indicate the pulse amplitude level corresponding to each array in the binary sequence corresponding to the classic communication information. The quantum signal recovery module demodulates the quantum signal to obtain quantum information.

6. The method according to claim 5, characterized in that, The signal demodulation module includes: a first rising edge detector, a pulse width timer, a first threshold comparator, and a first information decoder; The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal, including: The first rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, the pulse width timer is triggered to start timing to determine the pulse width of the synchronization pulse. The pulse width represents the time interval from the rising edge to the falling edge of the synchronization pulse. The modulated synchronization signal includes multiple synchronization pulses. The first threshold comparator compares the pulse width of each synchronization pulse with a preset pulse width level to determine the pulse width level to which the pulse width of the synchronization pulse belongs. The first information decoder demodulates each synchronization pulse according to the pulse width level to which the pulse width of each synchronization pulse belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

7. The method according to claim 5, characterized in that, The signal demodulation module includes: a second rising edge detector, an amplitude sampler, a gain compensation unit, a second threshold comparator, and a second information decoder; The signal demodulation module determines the pulse modulation information of the modulated synchronization signal and demodulates the modulated synchronization signal according to the pulse modulation information to extract the classical communication information carried by the communication signal from the modulated synchronization signal, including: The second rising edge detector detects the rising edge of each synchronization pulse in the modulated synchronization signal, and for each synchronization pulse, when the rising edge of the synchronization pulse is detected, the amplitude sampler is triggered to start sampling to obtain the sampling amplitude of the synchronization pulse; The gain compensation unit normalizes the sampling amplitude of each synchronization pulse to obtain the compensated pulse amplitude of each synchronization pulse. The second threshold comparator compares the compensated pulse amplitude of each synchronization pulse with a preset pulse amplitude level to determine the pulse amplitude level to which the compensated pulse amplitude of the synchronization pulse belongs. The second information decoder demodulates each synchronization pulse according to the pulse amplitude level to which the compensated pulse amplitude of each synchronization pulse belongs, so as to extract the classic communication information carried by the communication signal from the modulated synchronization signal.

8. The method according to claim 5, characterized in that, The quantum signal recovery module demodulates the quantum signal to obtain quantum information, including: The quantum signal recovery module demodulates the quantum signal according to the transmission time slot of the modulated synchronization signal to obtain the quantum information.

9. A transmitting device, characterized in that, include: Synchronization signal generation module, synchronization signal modulation module, quantum signal generation module, and combiner; The transmitting device is used to perform the steps in the integrated signal transmission and confidentiality processing method according to any one of claims 1-4 to transmit signals.

10. A receiving device, characterized in that, include: Wavelength divider, quantum signal recovery 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 5-8 to receive signals.

11. A signal transmission and encryption integrated processing system, characterized in that, include: The transmitting device according to claim 9 and the receiving device according to claim 10.

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