Coherent fading suppression method and device based on frequency-space multiplexing
By employing a synergistic multiplexing strategy in the frequency and spatial domains, and using multi-core fiber parallel sensing and multiple merging methods, the resolution and bandwidth loss caused by signal fading were resolved, thereby improving signal stability and detection capability.
Patent Information
- Application Number
- CN202511505701.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-01-13
AI Technical Summary
While existing technologies reduce the probability of signal fading, they often result in a sacrifice in resolution or detection bandwidth, making it impossible to maintain signal stability in long-distance, high-sensitivity measurements and high-speed transmissions.
A collaborative multiplexing approach using frequency and spatial domain multiplexing strategies is adopted. Multi-core optical fibers are used to sense multi-frequency carrier probe optical signals in parallel, and multi-channel backscattered signals are combined multiple times to generate a target signal with coherent fading suppression.
It effectively reduces the probability of signal fading, ensuring that resolution and detection bandwidth are not compromised, and is suitable for a variety of distributed fiber optic sensing scenarios, including complex applications such as strong disturbances, long-distance transmission, and large dynamic range.
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Figure CN121333416A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of optical fiber communication, and more particularly relates to a coherent fading suppression method and device based on frequency-space multiplexing. BACKGROUND
[0002] Phase-sensitive optical time domain reflectometry is widely used in long-distance, high-sensitivity measurement and high-speed transmission. Its system usually uses a narrow linewidth laser as a coherent light source, forms a detection signal through phase / intensity modulation, and performs heterodyne or in-phase coherent detection at the receiving end after propagation through an optical fiber medium. However, due to Rayleigh scattering, dispersion, multipath interference, and polarization state fluctuation, the amplitude and phase of the received signal present random fluctuations with time, frequency, and spatial position, and deep fading easily occurs.
[0003] At present, a single-dimensional component coherent fading suppression method is usually used, such as time domain average suppression and frequency domain rejection suppression. The time domain average suppression is to sample the same detection point multiple times, and to cumulatively average the multiple measured backscattering signals, which is equivalent to directly performing low-pass filtering in the time domain, resulting in a sacrifice of resolution. The frequency domain rejection suppression is that for a multi-frequency carrier detection optical signal, the middle amplitude is high, and the amplitudes on both sides are low. At this time, too many frequency noise signals with low amplitudes on both sides will be directly rejected, resulting in a sacrifice of detection bandwidth. Therefore, the above method will cause a sacrifice of resolution or detection bandwidth due to the direct filtering of part of the related signals on the basis of reducing the signal fading probability. SUMMARY
[0004] In view of the defects of the prior art, the purpose of the present application is to provide a coherent fading suppression method and device based on frequency-space multiplexing, which aims to solve the problem that the prior art causes a sacrifice of resolution or detection bandwidth due to the direct filtering of part of the related signals on the basis of reducing the signal fading probability.
[0005] To achieve the above purpose, in a first aspect, the present application provides a coherent fading suppression method based on frequency-space multiplexing, comprising: acquiring a to-be-suppressed optical signal, and generating a multi-frequency carrier detection optical signal according to the to-be-suppressed optical signal; performing parallel sensing on the multi-frequency carrier detection optical signal based on a multi-core optical fiber to obtain a backscattering Rayleigh light signal; generating a multi-channel backscattering signal with multiple frequency components according to the backscattering Rayleigh light signal and a target local oscillator light signal; performing single-channel multi-frequency component merging on the multi-channel backscattering signal, and performing spatial domain secondary merging on the merged multi-channel backscattering signal to obtain a target signal after coherent fading suppression.
[0006] In an embodiment, the step of generating a multi-frequency carrier probe light signal according to the light signal to be suppressed comprises: dividing the light signal to be suppressed to obtain an initial probe light signal; receiving a sinusoidal electric drive of a specific frequency provided by a signal generation device; modulating the initial probe light signal by driving a phase modulation device by the sinusoidal electric drive based on a frequency domain multiplexing strategy to obtain a multi-frequency carrier probe light signal; or receiving a pulsed electric drive of a specific frequency provided by a signal generation device; pulsing the initial probe light signal by driving an acousto-optic modulation device by the pulsed electric drive based on a frequency domain multiplexing strategy, and applying a frequency shift to the pulsed initial probe light signal to obtain a multi-frequency carrier probe light signal.
[0007] In an embodiment, the step of performing parallel sensing on the multi-frequency carrier probe light signal based on a multi-core optical fiber to obtain a backscattering Rayleigh light signal comprises: amplifying the multi-frequency carrier probe light signal by an optical fiber amplification device, and controlling the amplified multi-frequency carrier probe light signal to enter the multi-core optical fiber by an optical fiber ring device; injecting the amplified multi-frequency carrier probe light signal into each core of the multi-core optical fiber according to a preset frequency domain by a fan-in fan-out device; performing parallel sensing on the injected multi-frequency carrier probe light signal in independent channels of each core based on a spatial domain multiplexing strategy to obtain a backscattering Rayleigh light signal.
[0008] In an embodiment, the step of generating a multi-channel backscattering signal with multi-frequency components according to the backscattering Rayleigh light signal and a target local oscillator light signal comprises: dividing the light signal to be suppressed to obtain a target local oscillator light signal; coherently mixing the backscattering Rayleigh light signal and the target local oscillator light signal; heterodyne detecting the mixed backscattering Rayleigh light signal by a balanced optical detection device to obtain a target electric signal; performing parallel sampling on the target electric signal by an oscilloscope device to obtain a multi-channel backscattering signal with multi-frequency components.
[0009] In an embodiment, the step of performing single-channel multi-frequency component merging on the multi-channel backscattering signal, and performing spatial domain secondary merging on the merged multi-channel backscattering signal to obtain a target signal after coherent fading suppression comprises: obtaining amplitudes of each frequency component of the multi-channel backscattering signal; The amplitude is shaped using a phase modulation device, and the shaped amplitude is then corrected. The target multi-channel backscatter signal is obtained by time synchronization of the corrected multi-channel backscatter signal based on the synchronous detection signal. The target multi-channel backscattered signal is combined with its multi-frequency components in a single channel; the combined target multi-channel backscattered signal is then combined again in the spatial domain to obtain the target signal after coherent fading suppression.
[0010] In one embodiment, the step of performing single-channel multi-frequency component combining on the target multi-channel backscattered signal, and performing spatial domain secondary combining on the combined target multi-channel backscattered signal to obtain the target signal with coherent fading suppression, includes: The multi-channel backscattered signal of the target is combined into multiple frequency components in a single channel within the same core. The target multichannel backscattered signals after merging are spatially combined in two different cores to obtain the target signal after coherent fading suppression.
[0011] Secondly, this application provides a coherent fading suppression device based on frequency-space multiplexing, comprising: A generation module is used to acquire the optical signal to be suppressed and generate a multi-frequency carrier probe optical signal based on the optical signal to be suppressed. A parallel sensing module is used to perform parallel sensing of the multi-frequency carrier probe optical signal based on a multi-core optical fiber to obtain the backscattered Rayleigh optical signal. The generation module is also used to generate a multi-channel backscattered signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal; The suppression module is used to perform single-channel multi-frequency component merging on the multi-channel backscattered signal, and to perform spatial domain secondary merging on the merged multi-channel backscattered signal to obtain the target signal after coherent fading suppression.
[0012] Thirdly, this application provides an electronic device, comprising: at least one memory for storing a program; and at least one processor for executing the program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the method described in the first aspect or any possible implementation thereof.
[0013] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to perform the method described in the first aspect or any possible implementation thereof.
[0014] Fifthly, this application provides a computer program product that, when run on a processor, causes the processor to perform the method described in the first aspect or any possible implementation thereof.
[0015] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.
[0016] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: (1) This application adopts a frequency domain multiplexing strategy and a spatial domain multiplexing strategy to resist fading. By introducing multiple independent channels in two dimensions, the injected multi-frequency carrier probe optical signal is sensed in parallel, so that the phase-sensitive optical time domain reflection system can still maintain the overall output stability when the local signal fades. This can effectively and stably reduce the occurrence rate of dead zone and reduce amplitude fluctuation, while ensuring that resolution and probe bandwidth are not sacrificed.
[0017] (2) This application generates a multi-channel backscattered signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal. Then, it uses a merging method to perform single-channel multi-frequency component merging of the multi-channel backscattered signal within the same core, and performs spatial domain secondary merging of the merged multi-channel backscattered signal between different cores. This effectively reduces the signal fading probability without sacrificing resolution and detection bandwidth. In addition, the technical solution of this application has strong scalability and can be applied to various distributed fiber optic sensing scenarios, such as complex application scenarios with strong disturbances, long-distance transmission, and large dynamic range, simplifying the complexity of engineering deployment.
[0018] In summary, this application acquires the optical signal to be suppressed and generates a multi-frequency carrier probe optical signal based on the optical signal to be suppressed; it performs parallel sensing of the multi-frequency carrier probe optical signal based on a multi-core optical fiber to obtain a backscattered Rayleigh optical signal; it generates a multi-channel backscattered signal with multiple frequency components based on the backscattered Rayleigh optical signal and the target local oscillator optical signal; it performs single-channel multi-frequency component merging on the multi-channel backscattered signal and performs secondary spatial domain merging on the merged multi-channel backscattered signal to obtain the target signal after coherent fading suppression. Through the above method, a synergistic multiplexing anti-fading approach combining frequency domain multiplexing and spatial domain multiplexing strategies is adopted. Multiple independent channels are introduced to perform parallel sensing of the injected multi-frequency carrier probe optical signal, and then the multi-channel backscattered signals are merged multiple times. This effectively reduces the signal fading probability while ensuring that resolution and detection bandwidth are not sacrificed, and maintains the overall stability of the system output. Attached Figure Description
[0019] Figure 1This is one of the flowcharts illustrating the coherent fading suppression method based on frequency-space multiplexing provided in the embodiments of this application; Figure 2 This is a schematic diagram of the overall modules provided in the embodiments of this application; Figure 3 This is the second flowchart illustrating the coherent fading suppression method based on frequency-space multiplexing provided in the embodiments of this application; Figure 4 This is a schematic diagram of the module structure of the coherent fading suppression device based on frequency-space multiplexing provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0021] In this article, the term "and / or" describes 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. The symbol " / " in this article indicates that the related objects are in an "or" relationship; for example, A / B means A or B.
[0022] The terms "first" and "second," etc., used in the specification and claims herein are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.
[0023] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0024] Based on this, embodiments of this application provide a coherent fading suppression method based on frequency-space multiplexing, referring to... Figure 1 , Figure 1 This is one of the flowcharts illustrating a coherent fading suppression method based on frequency-space multiplexing provided in this application. In this embodiment, the coherent fading suppression method based on frequency-space multiplexing includes steps S10 to S40: Step S10: Obtain the optical signal to be suppressed, and generate a multi-frequency carrier probe optical signal based on the optical signal to be suppressed.
[0025] It should be noted that the reference Figure 2 , Figure 2 The diagram shows the overall module, which includes: a narrow-linewidth laser device, a phase modulation device, an acousto-optic modulation device, an optical fiber amplification device, an optical fiber loop device, a multi-core optical fiber, a polarization control device, a balanced photodetector device, an oscilloscope device, and a signal generation device. The specific process is as follows: The narrow-linewidth laser device outputs a light signal to be suppressed, which sequentially passes through the phase modulation device, the acousto-optic modulation device, and the optical fiber amplification device. After beam splitting, it enters the optical fiber loop device. The multi-frequency carrier probe light signal is then injected into each core of the multi-core optical fiber via fan-in and fan-out devices. The multi-core optical fiber acts as a spatial multiplexing medium. After parallel sensing of the multi-frequency carrier probe light signal, the backscattered Rayleigh light signal is transmitted by the optical fiber loop device to the detection branch. It is mixed with the target local oscillator light signal, whose polarization is controlled and matched by the polarization control device, at the coupler and transmitted to the balanced photodetector device. The balanced photodetector device performs heterodyne detection on the mixed backscattered Rayleigh light signal, and then the oscilloscope device performs parallel sampling of the target electrical signal.
[0026] It should be understood that the optical signal to be suppressed can originate from a narrow-linewidth laser device, that is, it can be a single-frequency narrow-linewidth optical signal output by a narrow-linewidth laser device. The narrow-linewidth laser device can be a narrow-linewidth laser source. The multi-frequency carrier probe optical signal refers to a composite optical signal composed of multiple laser frequencies (carriers) with specific intervals. The generation of the multi-frequency carrier probe optical signal can be carried out in various ways. For example, the initial probe optical signal can be modulated by a phase modulation device driven by a sinusoidal wave electric drive, or the initial probe optical signal can be pulse-gated by an acousto-optic modulation device driven by a pulse electric drive, and a frequency shift can be applied to the pulse-gated initial probe optical signal, with each frequency component participating in diversity as an independent branch.
[0027] Further, step S10 includes: dividing the optical signal to be suppressed to obtain an initial probe optical signal; receiving a sinusoidal wave electric drive of a specific frequency provided by a signal generating device; modulating the initial probe optical signal by driving a phase modulation device through the sinusoidal wave electric drive based on a frequency domain multiplexing strategy to obtain a multi-frequency carrier probe optical signal; or receiving a pulse electric drive of a specific frequency provided by a signal generating device; pulse-gating the initial probe optical signal by driving an acousto-optic modulation device through the pulse electric drive based on a frequency domain multiplexing strategy, and applying a frequency shift to the pulse-gated initial probe optical signal to obtain a multi-frequency carrier probe optical signal.
[0028] Understandably, in this embodiment, a portion of the optical signal to be suppressed is used to generate a multi-frequency carrier probe optical signal, and another portion is used to generate a multi-channel backscattered signal with multiple frequency components. Therefore, the optical signal to be suppressed needs to be divided into an initial probe optical signal and a target local oscillator optical signal. For the signal generating device, when generating a multi-frequency carrier probe optical signal based on a phase modulation device, a sinusoidal wave electric drive of a specific frequency is provided. This sinusoidal wave electric drive is used to drive the phase modulation device to modulate the initial probe optical signal, thereby generating an optical frequency comb signal with equally spaced comb teeth. The spacing of the comb teeth in the optical frequency domain constitutes multiple frequency components. The optical frequency comb signal with equally spaced comb teeth is used as the multi-frequency carrier probe optical signal to realize the generation of equally spaced optical frequency components. For the signal generating device, when generating a multi-frequency carrier probe optical signal based on an acousto-optic modulation device, a pulse electric drive of a specific frequency is provided. This pulse electric drive is used to pulse-gated and frequency-shift the initial probe optical signal for heterodyne beat frequency generation.
[0029] It should be noted that the signal generating device can be a signal generator, the phase modulation device can be a phase modulator, and the acousto-optic modulation device can be an acousto-optic modulator. The specific frequency can be selected based on the specific fiber length, as long as it does not cause signal crosstalk. For example, if the fiber length is 2km, the specific frequency can be selected as 50kHz.
[0030] Step S20: Parallel sensing of the multi-frequency carrier probe optical signal based on multi-core optical fiber to obtain the backscattered Rayleigh optical signal.
[0031] Understandably, multi-core optical fibers provide multiple cores, which, in conjunction with fan-in and fan-out devices, separate each core. The number of cores is greater than or equal to two, preferably seven. Multi-core optical fibers can be implemented using multiple single-mode optical fibers in parallel. Backscattered Rayleigh light signals refer to the scattered light signals obtained after parallel sensing in the independent channels of each core based on a spatial domain multiplexing strategy. Furthermore, the frequency and spatial domains utilize the lack of correlation between cross-channel and cross-frequency branches, meaning that mismatch or failure of any frequency component does not affect the final anti-fading result.
[0032] Further, step S20 includes: amplifying the multi-frequency carrier probe optical signal using an optical fiber amplification device, and controlling the amplified multi-frequency carrier probe optical signal to enter the multi-core optical fiber using an optical fiber ring device; injecting the amplified multi-frequency carrier probe optical signal into each core of the multi-core optical fiber according to a preset frequency domain using a fan-in fan-out device; and performing parallel sensing of the injected multi-frequency carrier probe optical signal in the independent channels of each core based on a spatial domain multiplexing strategy to obtain a backscattered Rayleigh optical signal.
[0033] It should be understood that fiber optic amplification equipment refers to equipment that amplifies multi-frequency carrier probe optical signals. This fiber optic amplification equipment can be an erbium-doped fiber amplifier. After amplification by the fiber optic amplification equipment, the amplified multi-frequency carrier probe optical signal will also pass through a fiber optic loop device, which can be a circulator, so that the amplified multi-frequency carrier probe optical signal enters the multi-core fiber. Then, through fan-in and fan-out devices, the amplified multi-frequency carrier probe optical signal is injected into each core of the multi-core fiber according to a preset frequency domain, realizing spatial domain multiplexing. That is, based on the spatial domain multiplexing strategy, the injected multi-frequency carrier probe optical signal is sensed in parallel in the independent channels of each core.
[0034] It should be noted that this embodiment also includes a bandpass optical filter and a low-noise amplifier on the receiving side for bandwidth and noise shaping; and a piezoelectric ceramic transducer in the fiber optic link for disturbance simulation and to verify the effectiveness of the measurement capability of the phase-sensitive optical time-domain reflectometry system.
[0035] Step S30: Generate a multi-channel backscattering signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal.
[0036] It should be understood that the target local oscillator light signal refers to the light signal passing through the local oscillator branch. The frequency and phase of this target local oscillator light signal are consistent with those of the narrow linewidth laser device. It can be a single-frequency light or a frequency comb. A polarization control device is set on this local oscillator branch. This polarization control device can be a polarization controller, which solves the polarization-related coherent fading problem by matching or randomizing the polarization state. Preferably, the local oscillator structure uses co-source beam splitting. If an independent light source is used, optical coherence with the transmitter is maintained. After obtaining the backscattered Rayleigh light signal, a multi-channel backscattered signal with multiple frequency components can be generated by combining it with the target local oscillator light signal.
[0037] Step S40: Perform single-channel multi-frequency component merging on the multi-channel backscattered signal, and perform spatial domain secondary merging on the merged multi-channel backscattered signal to obtain the target signal after coherent fading suppression.
[0038] It is understood that the signal combining methods in this embodiment include, but are not limited to, rotating vector average weighted summation, amplitude / signal-to-noise ratio weighted summation, maximum ratio combining summation, etc. After different component combining is performed in the frequency domain and spatial domain, the target signal after coherent fading suppression is obtained. At this time, the target signal can also be subjected to subsequent processing such as phase / strain reconstruction or demodulation.
[0039] Further, step S40 includes: acquiring the amplitude of each frequency component of the multi-channel backscattered signal; shaping the amplitude using a phase modulation device and correcting the shaped amplitude; synchronizing the corrected multi-channel backscattered signal with time according to a synchronization detection signal to obtain a target multi-channel backscattered signal; combining the multi-frequency components of the target multi-channel backscattered signal in a single channel; and performing a secondary spatial domain combination on the combined target multi-channel backscattered signal to obtain a target signal with coherent fading suppression.
[0040] It should be understood that before merging multi-channel backscattered signals, the signals need to be shaped and corrected. This involves obtaining the amplitude of each frequency component of the multi-channel backscattered signal, then shaping the amplitude using a phase modulation device to ensure that the amplitudes of each frequency component are essentially consistent. Finally, the corrected multi-channel backscattered signals are synchronized in time using a synchronization detection signal to ensure temporal consistency, thus providing a basis for frequency and spatial domain merging. The intervals between the multiple frequency components are in the range of tens to hundreds of MHz, and the number of frequency components is no less than two.
[0041] Furthermore, the steps of performing single-channel multi-frequency component combining on the target multi-channel backscattered signal and performing spatial domain secondary combining on the combined target multi-channel backscattered signal to obtain a target signal with coherent fading suppression include: performing single-channel multi-frequency component combining on the target multi-channel backscattered signal within the same core; and performing spatial domain secondary combining on the combined target multi-channel backscattered signal between different cores to obtain a target signal with coherent fading suppression.
[0042] It is understood that the signal combining methods in this embodiment include, but are not limited to, rotating vector average weighted summation, amplitude / signal-to-noise ratio weighted summation, and maximum ratio combining summation. Specifically, the target multi-channel backscattered signal is first combined with the multi-frequency components of a single channel within the same core, and then the combined target multi-channel backscattered signal is combined in the spatial domain between different cores to finally obtain the target signal after coherent fading suppression, thereby effectively reducing the signal fading probability and verifying the effectiveness of two-dimensional combining.
[0043] This embodiment acquires the optical signal to be suppressed and generates a multi-frequency carrier probe optical signal based on it. The multi-frequency carrier probe optical signal is then sensed in parallel using a multi-core optical fiber to obtain a backscattered Rayleigh optical signal. A multi-channel backscattered signal with multiple frequency components is generated based on the backscattered Rayleigh optical signal and the target local oscillator signal. The multi-channel backscattered signal is then combined using single-channel multi-frequency components, and the combined multi-channel backscattered signal is further combined in the spatial domain to obtain the target signal after coherent fading suppression. By employing a synergistic multiplexing approach combining frequency domain multiplexing and spatial domain multiplexing, multiple independent channels are introduced to sense the injected multi-frequency carrier probe optical signal in parallel. The multi-channel backscattered signals are then combined multiple times, effectively reducing the probability of signal fading while ensuring no sacrifice in resolution and probe bandwidth, and maintaining the overall stability of the system output.
[0044] In one specific embodiment, this application provides steps for generating a multi-channel backscattered signal with multiple frequency components. Please refer to... Figure 3 , Figure 3 This is the second schematic flowchart of the coherent fading suppression method based on frequency-space multiplexing provided in the embodiments of this application. Step S30 includes steps S301 to S304: Step S301: Divide the optical signal to be suppressed to obtain the target local oscillator optical signal.
[0045] It should be noted that the target local oscillator optical signal refers to the optical signal that has passed through the local oscillator branch. The frequency and phase of the target local oscillator optical signal are consistent with those of the narrow linewidth laser device. It can be a single-frequency light or a frequency comb and is a part of the optical signal to be suppressed.
[0046] Step S302: Coherently mix the backscattered Rayleigh light signal and the target local oscillator light signal.
[0047] It is understandable that after obtaining the backscattered Rayleigh light signal, the backscattered Rayleigh light signal and the target local oscillator light signal can be coherently mixed using a coupler.
[0048] Step S303: Heterodyne detection is performed on the mixed backscattered Rayleigh light signal using a balanced light detection device to obtain the target electrical signal.
[0049] It should be understood that a balanced optical detection device refers to a device used for heterodyne detection of mixed signals. This balanced optical detection device can be a balanced photodetector. In this case, the balanced optical detection device can be used to perform heterodyne detection on the backscattered Rayleigh light signal after mixing, thereby realizing the conversion of optical signals to electrical signals.
[0050] Step S304: The target electrical signal is sampled in parallel using an oscilloscope to obtain a multi-channel backscattered signal with multiple frequency components.
[0051] It is understandable that after obtaining the target electrical signal, the target electrical signal will be input to an oscilloscope device, which will perform multi-channel parallel sampling to provide multi-frequency components of multi-channel backscattered signals for subsequent merging. This oscilloscope device can be an oscilloscope.
[0052] This embodiment divides the optical signal to be suppressed to obtain the target local oscillator signal; coherently mixes the backscattered Rayleigh light signal and the target local oscillator signal; heterodyne detection is performed on the mixed backscattered Rayleigh light signal using a balanced light detection device to obtain the target electrical signal; and parallel sampling of the target electrical signal is performed using an oscilloscope to obtain a multi-channel backscattered signal with multiple frequency components. By dividing the target local oscillator signal from the optical signal to be suppressed, coherently mixing the backscattered Rayleigh light signal and the target local oscillator signal using a coupler, and then performing parallel sampling using an oscilloscope, the efficiency of generating a multi-channel backscattered signal with multiple frequency components can be effectively improved.
[0053] The following describes the coherent fading suppression device based on frequency-space multiplexing provided in this application. The coherent fading suppression device based on frequency-space multiplexing described below can be referred to in conjunction with the coherent fading suppression method based on frequency-space multiplexing described above. Please refer to... Figure 4 , Figure 4 This is a schematic diagram of the module structure of the coherent fading suppression device based on frequency-space multiplexing provided in this application embodiment, including: The generation module T10 is used to acquire the optical signal to be suppressed and generate a multi-frequency carrier probe optical signal based on the optical signal to be suppressed.
[0054] The parallel sensing module T20 is used to perform parallel sensing of the multi-frequency carrier probe optical signal based on a multi-core optical fiber to obtain the backscattered Rayleigh optical signal.
[0055] The generation module T10 is also used to generate a multi-channel backscattering signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal.
[0056] The suppression module T30 is used to combine the multi-frequency components of the multi-channel backscattered signal in a single channel, and to perform a secondary spatial domain combination on the combined multi-channel backscattered signal to obtain the target signal after coherent fading suppression.
[0057] This embodiment acquires the optical signal to be suppressed and generates a multi-frequency carrier probe optical signal based on it. The multi-frequency carrier probe optical signal is then sensed in parallel using a multi-core optical fiber to obtain a backscattered Rayleigh optical signal. A multi-channel backscattered signal with multiple frequency components is generated based on the backscattered Rayleigh optical signal and the target local oscillator signal. The multi-channel backscattered signal is then combined using single-channel multi-frequency components, and the combined multi-channel backscattered signal is further combined in the spatial domain to obtain the target signal after coherent fading suppression. By employing a synergistic multiplexing approach combining frequency domain multiplexing and spatial domain multiplexing, multiple independent channels are introduced to sense the injected multi-frequency carrier probe optical signal in parallel. The multi-channel backscattered signals are then combined multiple times, effectively reducing the probability of signal fading while ensuring no sacrifice in resolution and probe bandwidth, and maintaining the overall stability of the system output.
[0058] It is understood that the detailed functional implementation of each of the above modules can be found in the description of the aforementioned method embodiments, and will not be repeated here.
[0059] It should be understood that the above-described device is used to execute the methods in the above embodiments. The implementation principle and technical effect of the corresponding program modules in the device are similar to those described in the above methods. The working process of the device can be referred to the corresponding process in the above methods, and will not be repeated here.
[0060] Based on the methods in the above embodiments, this application provides an electronic device, please refer to... Figure 5 , Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.
[0061] It should be noted that the system may include: a processor 10, a communications interface 20, a memory 30, and a communication bus 40. The processor 10, communications interface 20, and memory 30 communicate with each other via the communication bus 40. The processor 10 can invoke logical instructions stored in the memory 30 to execute the methods described in the above embodiments.
[0062] Furthermore, the logical instructions in the aforementioned memory 30 can be implemented as software functional units and, when sold or used as independent products, 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 prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
[0063] Based on the methods in the above embodiments, this application provides a computer-readable storage medium storing a computer program that, when run on a processor, causes the processor to execute the methods in the above embodiments.
[0064] Based on the methods in the above embodiments, this application provides a computer program product that, when run on a processor, causes the processor to execute the methods in the above embodiments.
[0065] It is understood that the processor in the embodiments of this application can be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, field-programmable gate arrays, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.
[0066] The method steps in this application embodiment can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor.
[0067] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. Those skilled in the art will readily understand that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A coherent fading suppression method based on frequency-space multiplexing, characterized in that, include: Acquire the optical signal to be suppressed, and generate a multi-frequency carrier probe optical signal based on the optical signal to be suppressed; Parallel sensing of the multi-frequency carrier probe optical signal is performed based on multi-core optical fiber to obtain the backscattered Rayleigh optical signal. A multi-channel backscattered signal with multiple frequency components is generated based on the backscattered Rayleigh light signal and the target local oscillator light signal; The multi-channel backscattered signal is combined with its multi-frequency components in a single channel, and then the combined multi-channel backscattered signal is combined again in the spatial domain to obtain the target signal after coherent fading suppression.
2. The method as described in claim 1, characterized in that, The step of generating a multi-frequency carrier probe optical signal based on the optical signal to be suppressed includes: The light signal to be suppressed is divided to obtain the initial detection light signal; A sinusoidal electric drive of a specific frequency provided by a signal generating device; Based on the frequency domain multiplexing strategy, the initial probe optical signal is modulated by the sinusoidal electric drive phase modulation device to obtain a multi-frequency carrier probe optical signal; Or receive pulses of a specific frequency provided by a signal generating device; Based on the frequency domain multiplexing strategy, the initial probe optical signal is pulse-gated by the pulse electric drive driven acousto-optic modulation device, and a frequency shift is applied to the pulse-gated initial probe optical signal to obtain a multi-frequency carrier probe optical signal.
3. The method as described in claim 1, characterized in that, The step of parallel sensing of the multi-frequency carrier probe optical signal based on multi-core optical fiber to obtain the backscattered Rayleigh optical signal includes: The multi-frequency carrier probe optical signal is amplified by an optical fiber amplification device, and the amplified multi-frequency carrier probe optical signal is controlled to enter the multi-core optical fiber by an optical fiber ring device. The amplified multi-frequency carrier probe optical signal is injected into each core of the multi-core optical fiber according to a preset frequency domain through a fan-in fan-out device. Based on the spatial domain multiplexing strategy, the injected multi-frequency carrier probe optical signal is sensed in parallel through the independent channels of each fiber core to obtain the backscattered Rayleigh optical signal.
4. The method as described in claim 1, characterized in that, The step of generating a multi-channel backscattered signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal includes: The optical signal to be suppressed is divided to obtain the target local oscillator optical signal; The backscattered Rayleigh light signal and the target local oscillator light signal are coherently mixed; The target electrical signal is obtained by heterodyne detection of the mixed back Rayleigh scattered light signal using a balanced light detection device. The target electrical signal is sampled in parallel using an oscilloscope to obtain a multi-channel backscattered signal with multiple frequency components.
5. The method according to any one of claims 1 to 4, characterized in that, The step of performing single-channel multi-frequency component combining on the multi-channel backscattered signal, and then performing spatial domain secondary combining on the combined multi-channel backscattered signal to obtain the target signal after coherent fading suppression, includes: Obtain the amplitude of each frequency component of the multi-channel backscattered signal; The amplitude is shaped using a phase modulation device, and the shaped amplitude is then corrected. The target multi-channel backscatter signal is obtained by time synchronization of the corrected multi-channel backscatter signal based on the synchronous detection signal. The target multi-channel backscattered signal is combined with its multi-frequency components in a single channel; the combined target multi-channel backscattered signal is then combined again in the spatial domain to obtain the target signal after coherent fading suppression.
6. The method as described in claim 5, characterized in that, The step of performing single-channel multi-frequency component combining on the target multi-channel backscattered signal, and then performing spatial domain secondary combining on the combined target multi-channel backscattered signal to obtain the target signal with coherent fading suppression, includes: The multi-channel backscattered signal of the target is combined into multiple frequency components in a single channel within the same core. The target multichannel backscattered signals after merging are spatially combined in two different cores to obtain the target signal after coherent fading suppression.
7. A coherent fading suppression device based on frequency-space multiplexing, characterized in that, include: A generation module is used to acquire the optical signal to be suppressed and generate a multi-frequency carrier probe optical signal based on the optical signal to be suppressed. A parallel sensing module is used to perform parallel sensing of the multi-frequency carrier probe optical signal based on a multi-core optical fiber to obtain the backscattered Rayleigh optical signal. The generation module is also used to generate a multi-channel backscattered signal with multiple frequency components based on the backscattered Rayleigh light signal and the target local oscillator light signal; The suppression module is used to perform single-channel multi-frequency component merging on the multi-channel backscattered signal, and to perform spatial domain secondary merging on the merged multi-channel backscattered signal to obtain the target signal after coherent fading suppression.
8. An electronic device, characterized in that, include: At least one memory for storing computer programs; At least one processor is configured to execute a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform the method as described in any one of claims 1-6.
9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is run on the processor, it causes the processor to perform the method as described in any one of claims 1-6.
10. A computer program product, characterized in that, When the computer program product is run on a processor, the processor causes the processor to perform the method as described in any one of claims 1-6.