Signal processing method, device, equipment and system based on synesthesia fusion system

Abstract

The application discloses a signal processing method, device, equipment and system based on a common sense fusion system. In the application, a delay time is introduced before a transmitting end transmits a modulated light signal or a pilot light signal, and a delay time is introduced to one of two polarized lights generated by a receiving end; after the two polarized lights are coherently detected with the modulated light signal and the pilot light signal, each beat frequency term is obtained, and after differential operation is performed on phase information of the beat frequency terms, phase noise of a transmitting end laser and phase noise of a local laser can be obtained. Finally, the beat frequency term, the phase noise of the transmitting end laser and the phase noise of the local laser are utilized, so that a vibration disturbance phase can be recovered and a communication signal after phase noise compensation can be obtained, so as to solve the influence of phase noise of a large linewidth laser on extraction of distributed vibration sensing phase information and the influence of enhanced equivalent phase noise on long-distance communication.

Description

Technical Field

[0001] This application relates to the field of network communication technology, and in particular to a signal processing method, apparatus, device and system based on a sensor fusion system. Background Technology

[0002] Sensing-communication fusion systems, which integrate communication and sensing, offer significant development opportunities for applications such as intelligent transportation, building structural health monitoring, and seismic activity monitoring. However, most existing sensing-communication fusion solutions based on phase detection rely on ultra-narrow linewidth lasers with linewidths below 100Hz. These lasers are not only difficult to flexibly tune across the entire C-band, but also expensive, significantly increasing system hardware costs and limiting the feasibility of large-scale applications. While introducing large-linewidth lasers can significantly reduce costs and improve system deployability, the resulting laser phase noise (LPN) problem is also exacerbated.

[0003] In phase-detection-based distributed vibration sensing systems, laser phase noise is directly superimposed on the effective perturbation phase, causing phase information to be submerged in the noise. In long-distance transmission scenarios, in coherent receiver architectures employing chromatic dispersion compensation (CDC), the coupling effect of laser phase noise and dispersion generates enhanced equivalent phase noise (EEPN). Theoretical analysis shows that the intensity of EEPN is proportional to cumulative dispersion, laser linewidth, and symbol rate, and is therefore particularly significant in long-distance, high-speed transmission scenarios. For traditional high-speed coherent communication systems, EEPN mainly manifests as a decrease in signal-to-noise ratio and a degradation in bit error rate performance. However, in integrated communication and sensing systems, the random phase perturbations introduced by EEPN not only further reduce communication quality but may also mask the true external perturbation information.

[0004] Therefore, for sensing fusion systems under large linewidth laser conditions, how to achieve high-speed communication and distributed vibration sensing function multiplexing, and suppress the generation of enhanced equivalent phase noise in order to improve the quality of communication signals, is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides a signal processing method, apparatus, device, and system based on a syn-sensory fusion system, which is designed for syn-sensory fusion systems under large linewidth laser conditions to achieve multiplexing of high-speed communication and distributed vibration sensing functions, suppress the generation of enhanced equivalent phase noise, and improve the quality of communication signals.

[0006] In a first aspect, this application provides a signal processing method based on a sensor fusion system, the signal processing method being applied at a receiving end, the signal processing method comprising: The receiver receives a coupled optical signal transmitted from the transmitter; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; The local oscillator light at the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; The beat frequency term is obtained by coherently detecting the modulated optical signal and the pilot optical signal using first polarized light and second polarized light, respectively. The first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined based on the beat frequency term. The phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted based on the first differential phase information and the second differential phase information. By using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

[0007] Optionally, the process of generating the coupled optical signal is as follows: The optical carrier of the transmitting laser is divided into a signal path and a pilot path. Communication data is modulated onto the signal path to generate a modulated optical signal. A delay time is introduced into the pilot path to generate a pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal, and then transmitted to the receiving end through a single-mode optical fiber. Alternatively, the optical carrier of the transmitting laser can be divided into a signal path and a pilot path. The communication data is modulated onto the signal path and a delay time is introduced to generate a modulated optical signal. The pilot path is used as the pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal and transmitted to the receiving end through a single-mode optical fiber.

[0008] Optionally, the local oscillator light at the receiving end is divided into first polarized light and second polarized light, including: The local oscillator light generated by the local oscillator laser at the receiving end is divided into X-polarized light and Y-polarized light; The delay time is introduced into the X-polarized light to obtain the first polarized light; the Y-polarized light is used as the second polarized light.

[0009] Optionally, using first polarized light and second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term, including: The modulated optical signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the first beat frequency term; The pilot light signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the second beat frequency term; The modulated optical signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the third beat frequency term; The pilot light signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the fourth beat frequency term.

[0010] Optionally, the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined based on the beat frequency term, including: Extract the first phase information and the second phase information; wherein, the first phase information is the phase information of the first beat frequency item, and the second phase information is the phase information of the second beat frequency item; or, the first phase information is the phase information of the third beat frequency item, and the second phase information is the phase information of the fourth beat frequency item; Extract the third phase information and the fourth phase information; wherein the third phase information is the phase information of the first beat frequency term, and the fourth phase information is the phase information of the third beat frequency term; The difference between the first phase information and the second phase information is calculated to obtain the first differential phase information of the transmitting laser; the difference between the third phase information and the fourth phase information is calculated to obtain the second differential phase information of the local oscillator laser.

[0011] Optionally, after receiving the coupled optical signal transmitted by the transmitter, the method further includes: The local oscillator light at the receiving end is divided into the first local oscillator light and the second local oscillator light; The first local oscillator light is introduced into frequency shifting through an acousto-optic modulator, and a delay time is introduced through an optical delay unit to obtain the receiver pilot; The coupled optical signal and the receiving pilot are combined through an optical coupler and then input into the signal port of the coherent receiver. The second local oscillator light is input into the local oscillator port of the coherent receiver. Coherent detection is performed by the coherent receiver to obtain the modulation optical beat frequency term of the modulation optical signal and the second local oscillator light, the pilot optical beat frequency term of the pilot optical signal and the second local oscillator light, and the local oscillator light beat frequency term of the receiving pilot and the second local oscillator light. The phase information of the modulation optical beat frequency term and the pilot optical beat frequency term is differentially divided to obtain the first differential phase information of the transmitting laser. The second differential phase information of the local oscillator laser is extracted from the phase information of the local oscillator beat frequency term. Based on the first differential phase information and the second differential phase information, the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted. By using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

[0012] Optionally, the vibration disturbance phase and the phase noise-compensated communication signal are determined using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, including: Extract total phase information from the beat frequency term; The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the total phase information to obtain the vibration disturbance phase; The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the phase information of the beat frequency term of the modulated optical signal to obtain the phase noise compensated communication signal.

[0013] Secondly, this application provides a signal processing device based on a synchrotron fusion system, comprising: A receiving module is used to receive a coupled optical signal sent by a transmitter; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; The beam splitting module is used to split the local oscillator light at the receiving end into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; The first coherent detection module is used to coherently detect the modulated optical signal and the pilot optical signal using first polarized light and second polarized light respectively to obtain the beat frequency term; The first differential phase determination module is used to determine the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser based on the beat frequency term. The first phase noise determination module is used to extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the first differential phase information and the second differential phase information. The processing module is used to determine the vibration disturbance phase and the communication signal after phase noise compensation by utilizing the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser.

[0014] Thirdly, this application provides an electronic device based on a sensor fusion system, comprising: Memory, used to store computer programs; A processor is used to implement the steps of the above-described signal processing method when executing the computer program.

[0015] Fourthly, this application also provides a signal processing system based on a synesthetic fusion system, comprising: The transmitter is used to send a coupled optical signal to the receiver via an optical fiber; the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber. The receiving end is used to receive the coupled optical signal transmitted by the transmitting end; the local oscillator light of the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; using the first polarized light and the second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term; the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined according to the beat frequency term, and the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted according to the first differential phase information and the second differential phase information; using the beat frequency term, the phase noise of the transmitting laser and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

[0016] Compared with the prior art, the technical solutions provided in this application have the following advantages: This application discloses a signal processing method, apparatus, device, and system based on a sensor fusion system. In this application, a delay time is introduced at the transmitting end before transmitting a modulated optical signal or a pilot optical signal. After the receiving end generates two beams of polarized light, a delay time is introduced for one of the polarized beams. After coherently probing the two beams of polarized light with the modulated optical signal and the pilot optical signal, each beat frequency term is obtained. After performing differential operations on the phase information of each beat frequency term, the phase noise of the transmitting laser and the phase noise of the local oscillator laser can be obtained. Finally, using the beat frequency terms, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase can be recovered and a communication signal after phase noise compensation can be obtained. This solves the problem of the phase noise of large-linewidth lasers affecting the extraction of phase information from distributed vibration sensing, and the impact of enhanced equivalent phase noise on long-distance communication. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1A schematic flowchart of a signal processing method based on a synesthesia fusion system is provided for an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a distributed vibration sensing and optical communication fusion system provided in an embodiment of this application; Figure 3 This is a schematic diagram of another distributed vibration sensing and optical communication fusion system provided in an embodiment of this application; Figure 4 This is a schematic diagram of another distributed vibration sensing and optical communication fusion system provided in an embodiment of this application; Figure 5 A schematic diagram of a signal processing device based on a synesthesia fusion system is provided for an embodiment of this application; Figure 6 This is a structural diagram of an electronic device based on a sensor fusion system, provided as an embodiment of this application. Detailed Implementation

[0021] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of this application.

[0022] It should be noted that, in the optional embodiments of this application, the data related to object information, when applied to specific products or technologies, requires the permission or consent of the object. Furthermore, the collection, use, and processing of this data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. In other words, if the embodiments of this application involve data related to an object, it must be obtained with the object's authorization and consent, the authorization and consent of relevant departments, and in accordance with the relevant laws, regulations, and standards of the country and region. If the embodiments involve personal information, the acquisition of all personal information requires the individual's consent. If sensitive information is involved, the separate consent of the information subject is required. The embodiments also need to be implemented with the object's authorization and consent.

[0023] 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. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Furthermore, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. To better understand and illustrate the solutions of the embodiments of this application, some technical terms involved in the embodiments of this application are briefly explained below.

[0025] DSP (Digital Signal Processing): This involves using algorithms in the digital domain to process signals and obtain the desired signal.

[0026] LO (Local Oscillator): The local oscillator is the local laser source in a coherent optical communication system, generating a stable, continuous light wave with a frequency close to that of the received signal light. At the receiver, the local oscillator light is mixed with the signal light, and coherent detection is used to amplify the weak signal, thereby significantly improving the receiver sensitivity.

[0027] ECL (External Cavity laser): A type of laser with an external resonant cavity.

[0028] DFB (Distributed Feedback Laser): A type of laser with a distributed feedback resonant cavity.

[0029] DP-IQMod (Dual-polarization IQ modulator): A dual-polarization IQ (in-phase) modulator is used to load digital electrical signals onto two optical carriers with mutually orthogonal polarization states in a high-order amplitude and phase modulation format. It is a core key device in the transmitter of a coherent optical communication system and is also the most complex and highly integrated electro-optic modulator.

[0030] ICR (Integrated Coherent Receiver): An integrated coherent receiver is used to receive and demodulate high-speed coherent signals.

[0031] A complex electric field is defined as the electric field intensity of a light wave at a certain moment and a certain spatial location.

[0032] Beat frequency is a fundamental concept in coherent optical detection. It refers to the component in the output electrical signal whose frequency is equal to the difference between the frequencies of the two light waves after two light waves of different frequencies (or with a phase difference) are mixed on a photodetector.

[0033] In related technologies, introducing an integrated sensing mechanism into large-linewidth coherent communication systems can significantly reduce system hardware complexity and deployment costs. On the one hand, by reusing the optical transceiver architecture of existing coherent communication systems, the introduction of additional sensing modules can be avoided, thereby reducing hardware overhead. On the other hand, if the system can tolerate a larger laser linewidth, a lower-cost large-linewidth laser source can be used, further improving the system's economics and scalability.

[0034] Distributed vibration sensing systems based on phase detection typically employ ultra-narrow linewidth lasers with linewidths below 100Hz to reduce the impact of laser phase noise on the sensed signal. However, lasers with linewidths below 100Hz and full C-band wavelength tunability are technically challenging to implement and costly to manufacture, severely limiting the large-scale commercial deployment capability of such systems. In contrast, traditional coherent fiber optic communication systems widely use lasers with linewidths above 100kHz and full C-band tunability. These lasers are significantly less expensive than ultra-narrow linewidth light sources and have already achieved mature industrial applications. Therefore, in integrated communication and sensing systems, reducing the linewidth requirements of distributed vibration sensing lasers to make the system compatible with linewidth light sources above 100kHz or even in the MHz range would significantly improve the system's economics and deployability.

[0035] However, with large-linewidth lasers, laser phase noise is significantly enhanced. In long-distance transmission systems, laser phase noise couples with the dispersion compensation process, generating enhanced equivalent phase noise. This noise not only reduces the bit error rate performance of the communication system but also severely interferes with the extraction of effective phase signals in distributed vibration sensing. Therefore, how to simultaneously achieve high-speed communication and high-precision distributed vibration sensing while being compatible with large-linewidth lasers has become a key technical challenge for integrated sensing and communication systems.

[0036] The publicly disclosed technical approaches for integrating fiber optic communication and sensing around large-linewidth lasers can be broadly categorized as follows: 1. Addressing the Impact of Laser Phase Noise on Distributed Vibration Sensing: A novel self-coherent detection system architecture is proposed to eliminate laser phase noise. This scheme can eliminate most of the laser phase noise, retaining the phase information caused by vibration by utilizing the receiver's delay time. This allows the use of kHz-level or even MHz-level linewidth lasers in the system to achieve integrated communication and sensing functions.

[0037] 2. To address the enhanced equivalent phase noise (EEPN) effect caused by the coupling of laser phase noise and dispersion: A guard interval is set in the digital subcarrier multiplexed signal, and two pilot signals are inserted within the guard interval as references for phase and dispersion estimation. At the receiver, the amplitude information of the pilot signals is extracted, and the dispersion during fiber transmission is estimated based on the pilot amplitude changes. Based on the phase changes of the two pilot signals, a combined term of the transmitter and receiver laser phase noise is obtained at the receiver. The combined phase is separated using signal processing algorithms, and the transmitter laser phase noise and the receiver local oscillator laser phase noise are estimated separately. The estimated transmitter and receiver phase noises are reconstructed separately. Subsequently, combined with the estimated dispersion, digital compensation is performed on the transmitter phase noise, receiver phase noise, and dispersion effects in the receiver signal, thereby mitigating the EEPN problem.

[0038] The relevant technologies suffer from the following problems: distributed vibration sensing technology based on phase detection generally relies on expensive, narrow-linewidth lasers with linewidths below 100Hz. To overcome this hardware bottleneck and eliminate the impact of phase noise on the integrated sensing performance, various suppression schemes have been proposed. For example, one related technology utilizes the channel between two sets of comb teeth in an optical frequency comb, performing delay differential calculations on the recovered phase to effectively suppress laser phase noise while achieving vibration sensing. Another related technology employs a balanced-delay self-coherent system using a commercial external cavity laser (ECL), which has also successfully achieved joint suppression of phase noise and distributed sensing. In recent years, researchers have begun to explore sensing fusion schemes using larger linewidth light sources. In another related technology, a system based on a low-cost MHz-level linewidth distributed feedback (DFB) laser and standard single-mode fiber has been proposed. This scheme attempts to introduce matched delay structures on the X and Y orthogonal polarization branches at both the transmitting and receiving ends, hoping to extract the phase of the carrier in the two polarization states and perform differential processing, thereby canceling wide-linewidth phase noise while preserving the vibration disturbance phase in the forward transmission. However, this type of polarization delay-based scheme has significant limitations. Because optical signals inevitably undergo random polarization rotation during long-distance transmission through optical fibers, the fixed X / Y polarization branches at the receiver cannot achieve stable alignment with the initial polarization state at the transmitter, often causing delay differential processing to fail. To compensate for this physical mismatch, the system is forced to introduce a highly complex compensation algorithm.

[0039] Therefore, there is an urgent need for a fusion solution from the system architecture level that can achieve the multiplexing of high-speed communication and distributed vibration sensing functions while suppressing or avoiding the generation mechanism of EEPN, rather than relying solely on backend DSP compensation. This not only relates to the quality of communication signals but also directly determines the sensitivity and stability of distributed phase sensing.

[0040] See Figure 1This is a schematic flowchart of a signal processing method based on a sensor fusion system provided in an embodiment of this application. The method is applied at the receiving end and includes: S101. Receive the coupled optical signal sent by the transmitter; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; This application proposes a coherent communication and sensing fusion system compatible with large-linewidth lasers. The proposed solution features a novel architecture for both the transmitter and receiver, eliminating the impact of laser phase noise on vibration phase information extraction. At the transmitter, the laser is split into two beams: one beam is used to modulate a multi-carrier signal to generate a modulated optical signal, and the other beam serves as a pilot optical signal. A delay is introduced into either the modulated or pilot optical signal, and these two signals are coupled together via a coupler for transmission in a single-mode optical fiber.

[0041] In one embodiment of this application, the process of generating the coupled optical signal is as follows: The optical carrier of the transmitting laser is split into a signal path and a pilot path. Communication data is modulated onto the signal path to generate a modulated optical signal. A delay time is introduced into the pilot path to generate a pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal and transmitted to the receiving end through a single-mode optical fiber. Alternatively, the optical carrier of the transmitting laser is split into a signal path and a pilot path. Communication data is modulated onto the signal path and a delay time is introduced to generate a modulated optical signal. The pilot path is used as the pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal and transmitted to the receiving end through a single-mode optical fiber.

[0042] Specifically, this application provides an optical transmitting device with a fixed delay coupling structure. After dividing a laser carrier into a signal path and a pilot path, the device can generate coupled optical signals in two ways: One method involves using the signal path to carry a dual-polarization modulation signal, forming a modulated optical signal, while the pilot path remains unmodulated and a preset delay time is introduced through an optical delay unit. The modulated optical signal and the delayed pilot optical signal are then coupled and transmitted through a single-mode optical fiber. The other method involves using the signal path to carry the dual-polarization modulation signal, introducing a preset delay time through an optical delay unit to form a modulated optical signal, while the pilot path remains unmodulated as a pilot optical signal. The delayed modulated optical signal and the pilot optical signal are then coupled and transmitted through a single-mode optical fiber. Both methods proposed in this application ensure that the receiving end receives a modulated optical signal and a pilot optical signal with a specific delay relationship, providing the necessary time offset for subsequent phase differential analysis.

[0043] It should be noted that both the modulated optical signal and the pilot optical signal in this application are dual-polarized optical signals, meaning that both the modulated optical signal and the pilot optical signal simultaneously contain X-polarization and Y-polarization components. Here, only the first method is used as an example to illustrate the modulated optical signal and the pilot optical signal. Specifically, at the transmitting end, the optical carrier is split into two paths. One optical carrier is modulated with multi-carrier data as the modulated optical signal, while the other optical carrier introduces a known delay time. As the pilot optical signal, the complex electric fields of the modulated optical signal and the pilot optical signal in X-polarization and Y-polarization can be expressed as follows: (1); (2); (3); (4); in, The complex electric field of the modulated optical signal on the X-polarization of the transmitting end. It is communication data modulated onto a carrier wave. Here, j is the complex exponential term, and j is the imaginary unit. Let be the angular frequency of the optical carrier wave, and t be the time. It is the phase noise of the laser at the transmitting end. To introduce phase noise into the transmitter laser with a delay time; The complex electric field of the pilot light signal on the X-polarization of the transmitter. The amplitude of the pilot optical signal. To delay time, The complex electric field of the modulated optical signal on the Y-polarization of the transmitting end. This represents the complex electric field of the pilot optical signal on the Y-polarized side of the transmitter.

[0044] This application couples a modulated optical signal and a pilot optical signal into an optical fiber channel. Vibrations at specific locations cause phase changes. At the receiving end, the electric fields of the modulated optical signal and the pilot optical signal in the coupled optical signal under X-polarization and Y-polarization are represented as follows: (5); (6); (7); (8); in, The complex electric field of the modulated optical signal on the X-polarization at the receiving end. The phase change caused by vibration, The complex electric field of the pilot optical signal on the X-polarization at the receiving end. The complex electric field of the modulated optical signal on the Y-polarization at the receiving end. This represents the complex electric field of the pilot optical signal on the Y-polarized side of the receiver.

[0045] S102. The local oscillator light at the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light.

[0046] This application proposes a coherent receiving device based on a local oscillator delay polarization diversity architecture. In this device, before entering the mixing structure, the local oscillator light is first decomposed into mutually orthogonal X-polarized components and Y-polarized components by a polarization beamsplitter. A fixed delay time is introduced into one of the polarization components, while the other polarization component is not delayed. In this application, the first polarized light can be X-polarized light with a delay time and the second polarized light can be Y-polarized light without delay processing, or the first polarized light can be Y-polarized light with a delay time and the second polarized light can be X-polarized light without delay processing.

[0047] Therefore, in one embodiment of this application, the local oscillator light at the receiving end is divided into a first polarized light and a second polarized light, including: dividing the local oscillator light generated by the local oscillator laser at the receiving end into X-polarized light and Y-polarized light; introducing a delay time into the X-polarized light to obtain the first polarized light; and using the Y-polarized light as the second polarized light.

[0048] Specifically, at the receiving end, this application uses a polarization beam splitter to split the local oscillator (LO) light into two polarizations: X-polarized light and Y-polarized light, introducing a delay time for the X-polarized light. The delay time introduced by the modulation optical signal or pilot optical signal at the transmitting end is completely consistent with the delay time introduced by the local oscillator polarization component at the receiving end.

[0049] S103. Using the first polarized light and the second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term.

[0050] In this application, after obtaining the delayed first polarized light and the undelayed second polarized light, the first polarized light and the second polarized light are used as reference local oscillators respectively, and mixed with the received signal light for detection. In this way, polarization manipulation can be performed at the local oscillator end, avoiding the interference of random polarization rotation of the optical fiber channel on the stability of phase compensation.

[0051] This application describes a process for obtaining beat frequency terms by coherently detecting modulated optical signals and pilot optical signals using first polarized light and second polarized light, respectively. The process includes: The modulated optical signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the first beat frequency term; The pilot light signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the second beat frequency term; The modulated optical signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the third beat frequency term; The pilot light signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the fourth beat frequency term.

[0052] Specifically, this application uses first and second polarized light generated by the same laser beam to coherently detect the modulation optical signal and the pilot optical signal, respectively, to obtain various beat frequency terms. Here, the modulation optical signal and pilot optical signal refer to the modulation optical signal and pilot optical signal received on the X-polarization branch of the integrated coherent receiver after the received coupled optical signal is input into the integrated coherent receiver, and the modulation optical signal and pilot optical signal received on the Y-polarization branch of the integrated coherent receiver. Specifically, each beat frequency term includes: a first beat frequency term obtained by coherently detecting the modulation optical signal received on the X-polarization branch of the integrated coherent receiver using the first polarized light; a second beat frequency term obtained by coherently detecting the pilot optical signal received on the X-polarization branch of the integrated coherent receiver using the first polarized light; a third beat frequency term obtained by coherently detecting the modulation optical signal received on the Y-polarization branch of the integrated coherent receiver using the second polarized light; and a fourth beat frequency term obtained by coherently detecting the pilot optical signal received on the Y-polarization branch of the integrated coherent receiver using the second polarized light. Here, taking X-polarized light (with a time delay introduced) as the first polarized light and Y-polarized light (without time delay) as examples, the beat frequency terms are explained as follows: (9); (10); (11); (12); in, To introduce the first beat frequency term of the modulated optical signal received on the X-polarization branch of the integrated coherent receiver, the X-polarized light with a delayed time is used. The complex conjugate of the local oscillator's complex electric field. For the phase noise of the local oscillator laser at the receiving end, To introduce phase noise in the local oscillator laser with a delay time, To introduce a second beat frequency term between the delayed X-polarized light and the pilot light signal received on the X-polarization branch of the integrated coherent receiver, The third beat frequency term is the modulated optical signal received on the Y-polarization branch of the integrated coherent receiver by the Y-polarization light without delay processing. The fourth beat frequency term is the pilot light signal received on the Y-polarized branch of the integrated coherent receiver for Y-polarized light without delay processing.

[0053] S104. Determine the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser based on the beat frequency term, and extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the first differential phase information and the second differential phase information.

[0054] In this application, a sensing fusion signal processing method based on the above-mentioned transmit and receive architecture is proposed. This method can extract the phase information of different polarization branches after coherent detection by performing digital signal processing on each beat frequency term. The phase information includes the first beat frequency term, the second beat frequency term, the third beat frequency term, and the fourth beat frequency term. Then, by differentially dividing the different beat frequency terms, the first differential phase information of the transmitter laser and the second differential phase information of the local oscillator laser are obtained.

[0055] In one embodiment of this application, determining the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser based on the beat frequency term includes: Extract the first phase information and the second phase information; wherein, the first phase information is the phase information of the first beat frequency item, and the second phase information is the phase information of the second beat frequency item; or, the first phase information is the phase information of the third beat frequency item, and the second phase information is the phase information of the fourth beat frequency item; Extract the third phase information and the fourth phase information; wherein the third phase information is the phase information of the first beat frequency term, and the fourth phase information is the phase information of the third beat frequency term; The difference between the first phase information and the second phase information is calculated to obtain the first differential phase information of the transmitting laser; the difference between the third phase information and the fourth phase information is calculated to obtain the second differential phase information of the local oscillator laser.

[0056] It should be noted that in actual optical fiber transmission, due to environmental disturbances and other factors, the polarization state of the optical signal may randomly rotate. This can cause a large portion of the power of the continuous optical pilot transmitted at the transmitter to couple into the X-polarization or Y-polarization branch of the coherent receiver at the receiver, resulting in polarization fading. To address this issue, this application does not rely on a fixed polarization allocation of the pilot power. Instead, it utilizes the combination of beat frequency terms from different polarization branches at the receiver to extract the differential phase information between the transmitter and the local oscillator laser for two typical scenarios.

[0057] Specifically, when most of the pilot light power is coupled into the X-polarization branch, differential processing can be performed using formulas (9), (10), and (11). That is, the first phase information is the phase information of the first beat frequency term (the phase information of formula (9)), the second phase information is the phase information of the second beat frequency term (the phase information of formula (10)). Subtracting the first phase information (the phase information of formula (9)) from the second phase information (the phase information of formula (10)) yields the first differential phase information of the transmitting laser. At the same time, the third phase information is the phase information of the first beat frequency term (the phase information of formula (9)), the fourth phase information is the phase information of the third beat frequency term (the phase information of formula (11)). Subtracting the third phase information (the phase information of formula (9)) from the fourth phase information (the phase information of formula (11)) yields the second differential phase information of the local oscillator laser.

[0058] When most of the pilot light power is coupled into the Y-polarization branch, differential processing is performed using formulas (9), (11), and (12). That is, the first phase information is the phase information of the third beat frequency term (the phase information of formula (11)), the second phase information is the phase information of the fourth beat frequency term (the phase information of formula (12)). Subtracting the first phase information (the phase information of formula (11)) from the second phase information (the phase information of formula (12)) yields the first differential phase information of the transmitting laser. At the same time, the third phase information is the phase information of the first beat frequency term (the phase information of formula (9)), the fourth phase information is the phase information of the third beat frequency term (the phase information of formula (11)). Subtracting the third phase information (the phase information of formula (9)) from the fourth phase information (the phase information of formula (11)) yields the second differential phase information of the local oscillator laser.

[0059] In other words, this application can extract the phase noise difference term of the transmitting laser by using the difference operation between the phase of the X-polarized modulated optical signal and the phase of the X-polarized pilot optical signal, or by using the difference operation between the phase of the Y-polarized modulated optical signal and the phase of the Y-polarized pilot optical signal; and by using the difference operation between the phase of the X-polarized modulated optical signal and the phase of the Y-polarized modulated optical signal, it can extract the phase noise difference term of the local oscillator laser.

[0060] By combining the above two methods, regardless of whether the pilot power mainly falls on X-polarization or Y-polarization, the differential phase noise between the transmitter and the local oscillator laser can be stably obtained, thereby restoring the phase of vibration disturbance and compensating for the phase noise in the communication signal.

[0061] In this application, the first differential phase information of the transmitting laser for: (13); The second differential phase information of the local oscillator laser for: (14); After obtaining the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser, this application can further extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the differential phase transfer function, which can be expressed in the frequency domain as: (15); (16); in, For the first differential phase information of the transmitting laser Perform a Fourier transform to obtain the spectrum of the first differential phase information; The spectrum of phase noise of the transmitting laser; For the second differential phase information of the local oscillator laser Perform a Fourier transform to obtain the spectrum of the second differential phase information; This is the spectrum of the phase noise of the local oscillator laser.

[0062] In other words: through Calculate Substituting into formula (15) will yield the result. And then By performing an inverse Fourier transform, the phase noise of the emitting laser in the time domain can be recovered. Similarly, through... Calculate Substituting into formula (16) will yield the result. And then By performing an inverse Fourier transform, the phase noise of the local oscillator laser can be recovered.

[0063] S105. Using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, determine the vibration disturbance phase and the communication signal after phase noise compensation.

[0064] This application provides a phase sensing and communication enhancement method. After recovering the real-time phase noise of the transmitter and local oscillator through the differential phase transfer function, the vibration disturbance phase and the communication signal after phase noise compensation can be determined.

[0065] In another embodiment of this application, the vibration disturbance phase and the phase noise-compensated communication signal are determined using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, including: The total phase information is extracted from the beat frequency term; the phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the total phase information to obtain the vibration disturbance phase; The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the phase information of the beat frequency term of the modulated optical signal to obtain the phase noise compensated communication signal.

[0066] Specifically, after obtaining the phase noise of the transmitting laser and the phase noise of the local oscillator laser, this application can subtract the two noises from the total phase information to extract the actual vibration disturbance phase caused by external vibration. The total phase information is extracted from the beat frequency term. In specific implementation, the phase information of any beat frequency term from formula (9) to formula (12) can be used as the total phase information to determine the vibration disturbance phase.

[0067] Furthermore, this application can also perform dispersion enhancement phase noise compensation on the modulated optical signal by using the estimated phase noise of the transmitting laser and the phase noise of the local oscillator laser. That is, select the beat frequency term of the modulated optical signal. The beat frequency term can be the beat frequency term shown in formula (9) or the beat frequency term shown in formula (11). Then, remove the phase noise of the transmitting laser and the phase noise of the local oscillator laser from the phase information of the beat frequency term. The final modulated optical signal is the communication signal after phase noise compensation, thereby improving the communication quality of the system under long-distance transmission and large linewidth laser conditions.

[0068] In summary, this application is compatible with the use of large-linewidth, low-cost laser sources, while simultaneously achieving integrated functions of distributed vibration sensing and high-speed optical transmission. Traditional distributed vibration sensing systems typically rely on narrow-linewidth lasers to accurately extract minute phase changes caused by vibration. However, narrow-linewidth lasers are expensive and, compared to widely commercially available 100kHz-level lasers, are not suitable for large-scale deployment. This solution, by sharing a single optical transceiver, extracts total phase information from the beat frequency term and removes the phase noise of the transmitting laser and the local oscillator laser from the total phase information, thus restoring the phase of the vibration disturbance generated by the vibration. This enables the reuse of communication and sensing functions, significantly reducing system hardware costs and digital signal processing complexity.

[0069] Furthermore, this scheme obtains a phase noise-compensated communication signal by removing the phase noise of the transmitting laser and the local oscillator laser from the phase information of the beat frequency term of the modulated optical signal. This method effectively mitigates the impact of enhanced equivalent phase noise generated by laser phase noise and dispersion on signal transmission in long-distance communication systems, improves the system's tolerance to large linewidth lasers, and ensures the reliability of high-speed data transmission and high-sensitivity distributed vibration sensing.

[0070] See Figure 2 This is a schematic diagram of a distributed vibration sensing and optical communication fusion system based on a large linewidth laser, provided in an embodiment of this application. Figure 2 As shown, this application splits the optical carrier emitted by the laser on the left end into two beams. One beam is modulated into a dual-polarization modulated optical signal by a dual-polarization IQ modulator (DP IQ Mod.). The AWG (Arrayed Waveguide Grating) in the figure is used for wavelength-level multiplexing and demultiplexing of the modulated optical signal. The other optical carrier is delayed by a time τ to obtain a pilot optical signal, and the modulated optical signal and the pilot optical signal are coupled together by a coupler for transmission in a single-mode fiber. During transmission through the single-mode fiber, a vibration signal is generated by a PZT (vibration generator) to simulate external disturbances.

[0071] At the receiving end, the local oscillator laser generates local oscillator light, which is split into two polarizations using a polarization beam splitter. One of the polarization states is delayed by the same time τ as at the transmitting end, and then input into a coherent receiver along with the received modulated and pilot optical signals for coherent detection. Inside each coherent receiver, the modulated and pilot optical signals are subjected to interference mixing. The mixed optical signals are then input into two pairs of balanced photodetectors (BPDs). Each BPD performs differential detection on the two input optical signals, outputting one in-phase component and one quadrature component electrical signal, generating a total of four differential current signals. This differential detection method effectively suppresses relative intensity noise and common-mode interference from the light source, while converting weak phase information into a high signal-to-noise ratio electrical signal. The four electrical signals are converted from analog to digital and then sent to a digital signal processor. The amplitude and phase information of the beat frequency terms corresponding to the X-polarized modulated light, X-polarized pilot light, Y-polarized modulated light, and Y-polarized pilot light are extracted from them. Then, differential operation is used to obtain the differential phase information of the transmitting laser and the local oscillator laser, respectively. The phase noise of the transmitting laser and the phase noise of the local oscillator laser are obtained through the transfer function of the differential phase. The vibration disturbance phase and the communication signal after phase noise compensation are determined using the above two noises.

[0072] As can be seen, this application is compatible with the use of large-linewidth, low-cost laser sources while maintaining high-precision detection capabilities for minute phase perturbations. This fundamentally avoids the dependence of traditional distributed vibration sensing systems on expensive, narrow-linewidth lasers, achieving a low-cost, high-performance integrated communication and sensing system. Furthermore, by constructing a fixed-delay-time coupling structure for the optical transmitter and a delayed-polarization diversity coherent receiver, this invention can naturally suppress laser phase noise and dispersion-enhanced phase noise generated by dispersion during long-distance optical transmission, improving the system's tolerance to large-linewidth lasers. This characteristic not only improves the quality of communication signal transmission but also ensures the sensitivity and spatial resolution of distributed vibration sensing, achieving a unity of high-speed optical transmission and high-precision vibration sensing functions. Moreover, the structural design of the coherent transmitter and receiver in this invention can be implemented using on-chip optics, facilitating system integration, simplifying hardware layout and digital signal processing, thereby reducing system costs and improving deployment feasibility while ensuring communication and sensing performance. In summary, this application effectively solves the three major technical bottlenecks of traditional systems in terms of cost, laser linewidth limitations, and the impact of EEPPN.

[0073] See Figure 3 This is a schematic diagram of another distributed vibration sensing and optical communication fusion system provided in an embodiment of this application. Figure 3 The system described is in Figure 2 The modified scheme based on the illustrated system changes the position of the delay unit at the transmitter, setting the fixed delay time after the modulation process. Specifically, the optical carrier is first multi-carrier modulated to form a modulated optical signal, and then a preset fixed delay time is introduced into the modulated optical signal. Subsequently, the delayed modulated signal is coupled with the pilot optical signal for output. In this modified scheme, the receiver structure remains unchanged, still employing a delayed polarization diversity coherent receiver architecture.

[0074] In summary, this application improves the architecture of the transmitter and receiver. At the transmitter, the optical carrier is split into two beams. A delay can be introduced after modulating a dual-polarized optical signal with one beam, or a delay can be introduced with the other beam, and then the beams are coupled together. At the receiver, the local oscillator light is split into X and Y polarizations by a polarization beam splitter, and a delay is introduced for one X-polarization state. After coherent detection and digital signal processing, the phase information of the modulated optical signal and the pilot optical signal is obtained. Finally, the phase noise of the transmitter laser is estimated by differentiating the phase information of the X-polarization of the modulated optical signal and the X-polarization of the pilot optical signal. Similarly, the phase noise of the local oscillator laser is estimated by differentiating the phase information of the X-polarization of the modulated optical signal and the Y-polarization of the pilot optical signal. Finally, by subtracting the estimated phase noise of the transmitter laser and the local oscillator light from the total phase information, the vibration disturbance phase can be recovered. This scheme can also address the impact of EEPPN on long-distance communication by using the estimated phase noise of the transmitter laser and the local oscillator light.

[0075] In another embodiment of this application, after receiving the coupled optical signal transmitted by the transmitter, the method further includes: The local oscillator light at the receiving end is divided into a first local oscillator light and a second local oscillator light. The first local oscillator light is introduced into frequency shift through an acousto-optic modulator and a delay time is introduced through an optical delay unit to obtain the receiving end pilot. The coupled optical signal and the receiving end pilot are combined through an optical coupler and then input into the signal port of a coherent receiver. The second local oscillator light is input into the local oscillator port of the coherent receiver. Coherent detection is performed by the coherent receiver to obtain the modulation optical beat frequency term between the modulated optical signal and the second local oscillator light, the pilot optical beat frequency term between the pilot optical signal and the second local oscillator light, and the local oscillator light beat frequency term between the receiving end pilot and the second local oscillator light. The phase information of the modulation optical beat frequency term and the pilot optical beat frequency term is differentially divided to obtain the first differential phase information of the transmitting laser. The second differential phase information of the local oscillator laser is extracted from the phase information of the local oscillator beat frequency term. Based on the first differential phase information and the second differential phase information, the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted. By using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

[0076] In this embodiment, based on the above embodiments, the optical emission structure at the transmitting end remains unchanged, and a fixed delay time coupling structure is still used to split the optical carrier into a modulated optical signal and a delayed pilot optical signal, which are then coupled and transmitted. The complex electric fields of the modulated optical signal and the pilot optical signal in X and Y polarization can be expressed as follows: (17); (18); Since the signal processing in this embodiment does not rely on polarization differentiation, X-polarization and Y-polarization are no longer separately labeled in this embodiment, and are uniformly represented as... and , The complex electric field of the modulated optical signal at the transmitting end. This represents the complex electric field of the pilot optical signal at the transmitting end. For explanations of other parameters, please refer to the above embodiments.

[0077] The modulated optical signal and pilot optical signal are then coupled into the optical fiber channel, where vibrations at specific locations cause phase changes in the signal path. The electric fields of the modulated optical signal and pilot optical signal at the receiving end are represented as follows: (19); (20); in, The complex electric field of the modulated optical signal at the receiving end. This is the complex electric field of the pilot optical signal at the receiving end.

[0078] This embodiment improves the receiver by splitting the local oscillator light into a first local oscillator light and a second local oscillator light at the transmitter. The first local oscillator light is then frequency-shifted by an acousto-optic modulator (AOM) and a fixed delay time is applied by an optical delay unit to obtain the receiver pilot. The electric field of the receiver pilot is represented as follows: (twenty one); in, For the complex electric field of the pilot at the receiving end, The angular frequency of the optical carrier wave. Frequency shift introduced for acousto-optic modulators.

[0079] Subsequently, the frequency-shifted and delayed receiver pilot light is combined with the received coupled optical signal via an optical coupler and used as a new signal light input to the ICR (coherent receiver). Another beam of second local oscillator light is directly input to the ICR as the local oscillator light to participate in coherent detection, obtaining the modulation optical beat frequency term between the modulated optical signal and the second local oscillator light, the pilot optical beat frequency term between the pilot light signal and the second local oscillator light, and the local oscillator light beat frequency term between the receiver pilot light and the second local oscillator light. The beat frequency terms are shown below: (twenty two); (twenty three); (twenty four); in, This is the beat frequency term of the modulated optical signal and the second local oscillator. This is the pilot light beat frequency term between the pilot light signal and the second local oscillator light. This refers to the local oscillator beat frequency term of the receiving pilot and the second local oscillator.

[0080] Then, the phase information of the modulation optical beat frequency term and the pilot optical beat frequency term is differentially divided to eliminate the phase noise of the local oscillator, and the first differential phase information of the phase noise of the transmitting laser is obtained. The representation of the first differential phase information is shown in formula (13). The second differential phase information of the local oscillator laser is obtained through the differential phase of the local oscillator beat frequency term. The representation of the second differential phase information is shown in formula (14). After obtaining the first differential phase information and the second differential phase information, the phase noise of the transmitting laser and the phase noise of the local oscillator laser can be extracted according to formulas (15) and (16) in the above embodiments. Then, the total phase information is extracted from the modulation optical beat frequency term or the pilot optical beat frequency term, and the phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the total phase information to obtain the vibration disturbance phase. The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the modulation optical beat frequency term to obtain the communication signal after phase noise compensation.

[0081] See Figure 4 This is a schematic diagram of another distributed vibration sensing and optical communication fusion system provided in an embodiment of this application, as shown below. Figure 4 The system structure's transmitter and... Figure 2 The transmitter structure is the same as shown; the difference lies in the receiver. The local oscillator laser output is split into two paths: a first local oscillator and a second local oscillator. The first local oscillator is frequency-shifted by an acousto-optic modulator (AOM) and introduced with the same delay time τ as the transmitter through an optical delay unit. This path serves as the signal port for obtaining the pilot and coupled optical signals input to the ICR at the receiver. The other path, the second local oscillator, is directly input to the local oscillator port of the ICR. The ICR obtains the modulation light beat frequency term between the modulated optical signal and the second local oscillator, the pilot light beat frequency term between the pilot light signal and the second local oscillator, and the local oscillator beat frequency term between the receiver pilot and the second local oscillator. These are then acquired by a real-time oscilloscope (RTO) and subjected to digital signal processing: the phase information of the modulation light beat frequency term and the pilot light beat frequency term is differentially divided to obtain the first differential phase information of the transmitter laser, thereby recovering the phase noise of the transmitter laser; the second differential phase information of the local oscillator laser is extracted from the phase information of the local oscillator beat frequency term, thereby recovering the phase noise of the local oscillator laser.

[0082] This method utilizes AOM frequency shifting to construct the local oscillator self-coherent beat frequency term, so that the extraction of the local oscillator differential phase does not depend on the polarization state of the received signal and the pilot power distribution, thus enabling stable acquisition of the local oscillator laser phase noise even in scenarios with severe polarization fading.

[0083] The signal processing apparatus provided in the embodiments of this application is described below. The apparatus described below and the method described above can be referred to in correspondence.

[0084] See Figure 5 , Figure 5 A schematic diagram of a signal processing device based on a synaptic fusion system is provided for embodiments of this application. The device specifically includes: The receiving module 11 is used to receive the coupled optical signal sent by the transmitting end; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; The beam splitting module 12 is used to split the local oscillator light at the receiving end into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; The first coherent detection module 13 is used to coherently detect the modulated optical signal and the pilot optical signal using first polarized light and second polarized light respectively to obtain the beat frequency term. The first differential phase determination module 14 is used to determine the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser based on the beat frequency term. The first phase noise determination module 15 is used to extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the first differential phase information and the second differential phase information. Processing module 16 is used to determine the vibration disturbance phase and the communication signal after phase noise compensation by using the beat frequency term, the phase noise of the transmitting laser and the phase noise of the local oscillator laser.

[0085] In another embodiment of this application, the beam splitting module is specifically used to: split the local oscillator light generated by the local oscillator laser at the receiving end into X-polarized light and Y-polarized light; introduce the delay time into the X-polarized light to obtain the first polarized light; and use the Y-polarized light as the second polarized light.

[0086] In another embodiment of this application, the first coherent detection module is specifically used for: The modulated optical signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the first beat frequency term; The pilot light signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the second beat frequency term; The modulated optical signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the third beat frequency term; The pilot light signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the fourth beat frequency term.

[0087] In another embodiment of this application, the first differential phase determination module is specifically used for: Extract the first phase information and the second phase information; wherein, the first phase information is the phase information of the first beat frequency item, and the second phase information is the phase information of the second beat frequency item; or, the first phase information is the phase information of the third beat frequency item, and the second phase information is the phase information of the fourth beat frequency item; Extract the third phase information and the fourth phase information; wherein the third phase information is the phase information of the first beat frequency term, and the fourth phase information is the phase information of the third beat frequency term; The difference between the first phase information and the second phase information is calculated to obtain the first differential phase information of the transmitting laser; the difference between the third phase information and the fourth phase information is calculated to obtain the second differential phase information of the local oscillator laser.

[0088] In another embodiment of this application, it further includes: The local oscillator light division module is used to divide the local oscillator light at the receiving end into the first local oscillator light and the second local oscillator light; The local oscillator light processing module is used to introduce the first local oscillator light into frequency shift through an acousto-optic modulator and introduce a delay time through an optical delay unit to obtain the receiving pilot; The second coherent detection module combines the coupled optical signal and the receiving pilot signal through an optical coupler and inputs them into the signal port of the coherent receiver. It inputs the second local oscillator light into the local oscillator port of the coherent receiver and performs coherent detection through the coherent receiver to obtain the modulation optical beat frequency term of the modulation optical signal and the second local oscillator light, the pilot optical beat frequency term of the pilot optical signal and the second local oscillator light, and the local oscillator light beat frequency term of the receiving pilot signal and the second local oscillator light. The second differential phase determination module is used to perform differential phase information analysis between the phase information of the modulation optical beat frequency term and the pilot optical beat frequency term to obtain the first differential phase information of the transmitting laser, and to extract the second differential phase information of the local oscillator laser from the phase information of the local oscillator beat frequency term. The second phase noise determination module is used to extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the first differential phase information and the second differential phase information.

[0089] In another embodiment of this application, the processing module is specifically used for: Extract the total phase information from the beat frequency term; remove the phase noise of the transmitting laser and the phase noise of the local oscillator laser from the total phase information to obtain the vibration disturbance phase; remove the phase noise of the transmitting laser and the phase noise of the local oscillator laser from the phase information of the beat frequency term of the modulated optical signal to obtain the communication signal after phase noise compensation.

[0090] Figure 6A structural diagram of an electronic device based on a sensor fusion system provided in this application embodiment includes: Memory 20 is used to store computer programs; The processor 21 is configured to execute a computer program to implement the steps of the method described in any of the above embodiments.

[0091] The electronic devices provided in this embodiment may include, but are not limited to, smartphones, tablets, laptops, or desktop computers.

[0092] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one hardware form selected from Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which handles computational operations related to machine learning.

[0093] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary storage or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc.

[0094] In some embodiments, the electronic device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0095] Those skilled in the art will understand that Figure 6 The structures shown do not constitute a limitation on electronic devices and may include more or fewer components than those shown.

[0096] In another exemplary embodiment, a computer storage medium is also provided, wherein the program instructions, when executed by a processor, implement the steps of the method described in any of the above method embodiments.

[0097] In another exemplary embodiment, a signal processing system based on a synaptic fusion system is also provided, comprising: The transmitter is used to send a coupled optical signal to the receiver via an optical fiber; the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber. The receiving end is used to receive the coupled optical signal transmitted by the transmitting end; the local oscillator light of the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; using the first polarized light and the second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term; the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined according to the beat frequency term, and the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted according to the first differential phase information and the second differential phase information; using the beat frequency term, the phase noise of the transmitting laser and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

[0098] Accordingly, the receiving end is used to implement the steps of the method described in the above method embodiments.

[0099] It is understood that if the methods in the above embodiments 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 application, in essence, or the part that contributes to the current technology, or all or 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 executes all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, magnetic disks, or optical disks, and other media capable of storing program code.

[0100] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” used herein may also mean the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0101] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0102] The above are only some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A signal processing method based on a synesthetic fusion system, characterized in that, The signal processing method is applied at the receiving end, and the signal processing method includes: The receiver receives a coupled optical signal transmitted from the transmitter; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; The local oscillator light at the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; The beat frequency term is obtained by coherently detecting the modulated optical signal and the pilot optical signal using first polarized light and second polarized light, respectively. The first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined based on the beat frequency term. The phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted based on the first differential phase information and the second differential phase information. By using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

2. The signal processing method according to claim 1, characterized in that, The process of generating the coupled optical signal is as follows: The optical carrier of the transmitting laser is divided into a signal path and a pilot path. Communication data is modulated onto the signal path to generate a modulated optical signal; the pilot path is introduced with a delay time to generate a pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal, and transmitted to the receiving end through a single-mode optical fiber; Alternatively, the optical carrier of the transmitting laser can be divided into a signal path and a pilot path. The communication data is modulated onto the signal path and a delay time is introduced to generate a modulated optical signal. The pilot path is used as the pilot optical signal. A coupled optical signal is generated based on the modulated optical signal and the pilot optical signal and transmitted to the receiving end through a single-mode optical fiber.

3. The signal processing method according to claim 1, characterized in that, The local oscillator light at the receiving end is divided into first polarized light and second polarized light, including: The local oscillator light generated by the local oscillator laser at the receiving end is divided into X-polarized light and Y-polarized light; The delay time is introduced into the X-polarized light to obtain the first polarized light; the Y-polarized light is used as the second polarized light.

4. The signal processing method according to claim 1, characterized in that, Using first polarized light and second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term, including: The modulated optical signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the first beat frequency term; The pilot light signal received on the X-polarization branch of the integrated coherent receiver is coherently detected using the first polarized light to obtain the second beat frequency term; The modulated optical signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the third beat frequency term; The pilot light signal received on the Y-polarization branch of the integrated coherent receiver is coherently detected using the second polarized light to obtain the fourth beat frequency term.

5. The signal processing method according to claim 4, characterized in that, The first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined based on the beat frequency term, including: Extract the first phase information and the second phase information; wherein, the first phase information is the phase information of the first beat frequency item, and the second phase information is the phase information of the second beat frequency item; or, the first phase information is the phase information of the third beat frequency item, and the second phase information is the phase information of the fourth beat frequency item; Extract the third phase information and the fourth phase information; wherein the third phase information is the phase information of the first beat frequency term, and the fourth phase information is the phase information of the third beat frequency term; The difference between the first phase information and the second phase information is calculated to obtain the first differential phase information of the transmitting laser; the difference between the third phase information and the fourth phase information is calculated to obtain the second differential phase information of the local oscillator laser.

6. The signal processing method according to claim 1, characterized in that, After receiving the coupled optical signal transmitted by the transmitter, it also includes: The local oscillator light at the receiving end is divided into the first local oscillator light and the second local oscillator light; The first local oscillator light is introduced into frequency shifting through an acousto-optic modulator, and a delay time is introduced through an optical delay unit to obtain the receiver pilot; The coupled optical signal and the receiving pilot are combined through an optical coupler and then input into the signal port of the coherent receiver. The second local oscillator light is input into the local oscillator port of the coherent receiver. Coherent detection is performed by the coherent receiver to obtain the modulation optical beat frequency term of the modulation optical signal and the second local oscillator light, the pilot optical beat frequency term of the pilot optical signal and the second local oscillator light, and the local oscillator light beat frequency term of the receiving pilot and the second local oscillator light. The phase information of the modulation optical beat frequency term and the pilot optical beat frequency term is differentially divided to obtain the first differential phase information of the transmitting laser. The second differential phase information of the local oscillator laser is extracted from the phase information of the local oscillator beat frequency term. Based on the first differential phase information and the second differential phase information, the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted. By using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

7. The signal processing method according to any one of claims 1 to 6, characterized in that, Using the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined, including: Extract total phase information from the beat frequency term; The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the total phase information to obtain the vibration disturbance phase; The phase noise of the transmitting laser and the phase noise of the local oscillator laser are removed from the phase information of the beat frequency term of the modulated optical signal to obtain the phase noise compensated communication signal.

8. A signal processing device based on a synesthetic fusion system, characterized in that, include: A receiving module is used to receive a coupled optical signal sent by a transmitter; wherein the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber; The beam splitting module is used to split the local oscillator light at the receiving end into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; The first coherent detection module is used to coherently detect the modulated optical signal and the pilot optical signal using first polarized light and second polarized light respectively to obtain the beat frequency term; The first differential phase determination module is used to determine the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser based on the beat frequency term. The first phase noise determination module is used to extract the phase noise of the transmitting laser and the phase noise of the local oscillator laser based on the first differential phase information and the second differential phase information. The processing module is used to determine the vibration disturbance phase and the communication signal after phase noise compensation by utilizing the beat frequency term, the phase noise of the transmitting laser, and the phase noise of the local oscillator laser.

9. An electronic device based on a sensor fusion system, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the signal processing method as described in any one of claims 1 to 7.

10. A signal processing system based on a synesthetic fusion system, characterized in that, include: The transmitter is used to send a coupled optical signal to the receiver via an optical fiber; the coupled optical signal includes a modulated optical signal and a pilot optical signal, and the modulated optical signal or the pilot optical signal has a delay time introduced before being transmitted through the optical fiber. The receiving end is used to receive the coupled optical signal transmitted by the transmitting end; the local oscillator light of the receiving end is divided into a first polarized light and a second polarized light; wherein the delay time has been introduced into the first polarized light; using the first polarized light and the second polarized light, coherent detection is performed on the modulated optical signal and the pilot optical signal respectively to obtain the beat frequency term; the first differential phase information of the transmitting laser and the second differential phase information of the local oscillator laser are determined according to the beat frequency term, and the phase noise of the transmitting laser and the phase noise of the local oscillator laser are extracted according to the first differential phase information and the second differential phase information; using the beat frequency term, the phase noise of the transmitting laser and the phase noise of the local oscillator laser, the vibration disturbance phase and the communication signal after phase noise compensation are determined.

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