A segmented compensation method for nonlinear noise in a co-channel integrated transmission system and application

Abstract

The application discloses a segmented compensation method for nonlinear noise in a common fiber transmission integrated system and application, and the method comprises the following steps: 1, performing global phase compensation on the communication receiving symbol sequence after common fiber transmission; 2, determining a key time window of concentrated interference of nonlinear noise according to a DAS pulse energy envelope; 3, dividing the communication symbol into multiple sub-sections in the key time window, and estimating a local nonlinear phase compensation amount by blind phase search in each sub-section; and 4, combining the sub-sections after local phase compensation with symbols outside the window to obtain a final compensation symbol sequence. The application can effectively suppress the local nonlinear phase noise introduced by the DAS pulse to the common wavelength transmission communication signal, so as to improve the communication signal-to-noise ratio and the bit error rate, and meanwhile, the DAS sensing function is maintained.

Description

Technical Field

[0001] This invention belongs to the field of integrated fiber optic sensing technology, specifically relating to a method and application for segmented compensation of nonlinear noise in a shared-fiber transmission system where digital subcarrier multiplexed communication signals and distributed acoustic sensing (DAS) pulses coexist in the same optical wavelength channel. This method compensates for local, time-varying, non-stationary, and asymmetric nonlinear phase noise caused by communication signals in high-peak-power DAS pulses through fiber nonlinear effects such as cross-phase modulation and nonlinear polarization rotation. Background Technology

[0002] With the development of 6G / F6G networks, fiber optic sensing integration technology enables simultaneous high-speed data transmission and environmental state perception by sharing existing fiber optic infrastructure. Distributed acoustic sensing (DAS) technology based on backscattering Rayleigh scattering can locate and detect vibrations, acoustic disturbances, or external events distributed along the fiber, making it an important means of achieving fiber optic sensing. Early fiber optic sensing systems often used wavelength division multiplexing (WDM) to isolate the sensing and communication channels; however, this method typically requires configuring independent wavelengths and corresponding transceiver modules for the sensing function, reducing spectrum resource utilization and increasing system complexity.

[0003] To improve the utilization rate of optical carrier resources, the scheme of multiplexing DAS pulses and digital subcarriers for communication signals in the same wavelength channel has attracted attention. This scheme can simultaneously carry communication transmission and distributed acoustic sensing functions on the same optical carrier resource. However, DAS pulses typically have high peak power, and when they propagate in the optical fiber link, they introduce non-uniform, time-varying phase disturbances into the communication subcarriers propagating at the same wavelength through fiber nonlinear effects such as cross-phase modulation and nonlinear polarization rotation. At the receiving end, this disturbance manifests as unilateral tailing, non-uniform spread, or asymmetric rotation distortion of the communication constellation points within the local time interval of the DAS pulse's passage, i.e., asymmetric phase noise.

[0004] Traditional carrier phase estimation methods typically perform phase estimation and compensation uniformly for received symbols across all time slots or over a large range. While suitable for compensating for overall phase rotation, laser phase noise, residual frequency offset, or slowly varying carrier phase noise, they struggle to effectively handle localized, bursty, time-varying, non-stationary, and non-uniform nonlinear phase disturbances caused by DAS pulses. When a DAS pulse passes through the time interval containing a communication symbol, communication constellation points may exhibit unilateral tailing, elliptical expansion, or non-uniform rotational distortion, resulting in significantly asymmetric nonlinear phase noise.

[0005] Existing global phase compensation methods cannot perform fine-grained processing of local time intervals where DAS pulses have a significant impact; if high-complexity local phase estimation is used for all communication symbols, it will increase the computational complexity of the receiver. In addition, ideal phase compensation usually relies on simulation or auxiliary reference information to obtain the phase perturbation induced by DAS pulses, which can only be used for performance upper bound analysis and is difficult to apply directly to actual unknown data transmission scenarios. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and propose a segmented compensation method and application for nonlinear noise in a co-fiber inductive integrated transmission system. This method aims to suppress local, time-varying, non-stationary, and asymmetric nonlinear phase noise caused by DAS pulses, improve the reception quality of communication signals in a co-fiber inductive integrated transmission system with the same wavelength, and maintain the distributed acoustic sensing function.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a segmented compensation method for nonlinear noise in a shared-fiber inductive integrated transmission system, characterized by the following steps: Step 1: In the co-fiber inductive integrated transmission system, the transmitting end transmits the communication signal and the DAS pulse in the same optical wavelength channel through the co-fiber link to obtain a signal transmitted at the same wavelength. The receiving end coherently receives the co-transmitted signal at the same wavelength, and after processing with electro-dispersion compensation, matched filtering, and symbol synchronization, obtains the communication received symbol sequence. ;in, For the first One communication received symbol, The total number of symbols received in communication; Step 2: Receive the communication symbol sequence Perform global phase compensation to eliminate global phase rotation and slowly varying phase noise, resulting in a globally compensated symbol sequence. ;in, For the first A globally compensated symbol; Step 3: Based on the energy envelope distribution of the DAS pulse, the time interval during which the DAS pulse energy exceeds a preset threshold is taken as the critical time window. Thus, the key time window is determined. exist The corresponding symbol index set ; Step 4, Divided into A set of non-overlapping sub-segment indices And satisfy ;in, For the first The set of symbol indices contained in each sub-segment , The number of sub-segments; Step 5, for Performing local nonlinear phase compensation yields the first... The set of all locally compensated symbols in each sub-segment Thus, the key time window is obtained. The set of local compensation symbols for all sub-segments ; Step 6: Define the key time window external global compensation symbols With the set of local compensation symbols By merging, we obtain the segmented and compensated communication symbol sequence. ,in, Indicates the key time window The outside A globally compensated symbol Indicates the first The symbols after segmented compensation.

[0008] The segmented compensation method of this invention is also characterized in that, in step 2, global phase compensation is implemented using a global blind phase search method, specifically: the length of the sliding window is set to... In length of Within the sliding window During the blind phase search, the global phase shift within the sliding window is estimated and compensated to obtain the globally compensated symbol sequence. .

[0009] Furthermore, the number of sub-segments in step 4 The method for determining this is based on the key time window. Duration and communication symbol rate Calculate the critical time window Total number of internal symbols Set the number of symbols contained in each sub-segment. Then the number of sub-segments ;in, .

[0010] Furthermore, step 5 includes: Step 5.1, set the number A set of local candidate test phases ;in, For the first The first sub-segment One candidate test phase, The number of candidate test phases; Step 5.2, for The Middle The symbol after global compensation Apply the first Candidate test phases The rotation of , thus using equation (1) to obtain the first The first sub-segment After phase rotation of the candidate test phase candidate symbols : (1) In equation (1), represents an imaginary number, ; Step 5.3, The ideal constellation set corresponding to the modulation format used from the decision to the sending end. The closest constellation point in Central Euclidean geometry ; Step 5.4: Calculate the first step using equation (2). Within each sub-segment, the first Intra-segment decision error metric for each candidate test phase : (2) Step 5.5, from Select the candidate test phase that minimizes the intra-segment decision error metric from among the candidate test phases. As the first Local nonlinear phase compensation amount of each segment : Step 5.6, for Apply The rotation of , thus using equation (3) to obtain the first The first sub-segment The symbol after local compensation : (3).

[0011] Furthermore, when the segmented compensation method is applied to a dual-polarization coherent communication system, steps 1 to 6 are executed independently for the X-polarization component and the Y-polarization component, respectively. Each polarization component constructs an independent candidate test phase set and decision error metric, and independently estimates and applies its own local nonlinear phase compensation amount.

[0012] This invention provides a segmented compensation device for nonlinear noise in a co-fiber inductive integrated transmission system, used to implement any of the above methods, characterized in that it includes: The coherent receiver module is used to coherently receive co-transmitted signals of the same wavelength after transmission via an optical fiber link. After processing including electrical dispersion compensation, matched filtering, and symbol synchronization, it outputs the communication received symbol sequence. ; The global phase compensation module is used to adjust the received symbol sequence of communication. Perform global phase compensation and output the globally compensated symbol sequence. ; The critical time window identification module is used to determine the critical time window based on the energy distribution of the DAS pulse. and its corresponding symbol index set ; The window segmentation local compensation module is used to segment the symbol index set. Divided into Each sub-segment undergoes a process involving candidate test phase rotation, constellation decision, and minimization of intra-segment decision error metric to obtain a local nonlinear phase compensation amount, which is used for... The corresponding globally compensated symbols are subjected to segment-by-segment local phase compensation, and this is synchronized with the key time window. The globally compensated symbols outside the segmented compensation communication symbol sequence form the overall communication symbol sequence. .

[0013] The present invention provides a common fiber sensing integrated transmission system, which includes: a transmitting end, an optical fiber link, a communication receiving branch, and a DAS sensing receiving branch. The transmitting end is used to multiplex the communication signal and the DAS pulse in the same optical wavelength channel and input them into the optical fiber link for transmission, so as to obtain a signal that is transmitted at the same wavelength. The communication receiving branch includes the segmentation compensation device of claim 6, and is used to process co-transmitted signals of the same wavelength and output a segmented compensation communication symbol sequence. ; The DAS sensor receiving branch is used to demodulate the backscattered signal of the common-transmission DAS pulse to obtain distributed sensing results.

[0014] The present invention provides an electronic device, including a memory and a processor, characterized in that the memory is used to store a program supporting a method of execution by the processor, and the processor is configured to execute the program stored in the memory.

[0015] The present invention discloses a computer-readable storage medium storing a computer program, characterized in that the computer program is executed by a processor to perform the steps of a method.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention addresses the nonlinear phase noise generated when DAS pulses and communication signals are transmitted on the same fiber at the same wavelength. It proposes a processing strategy that combines global phase compensation and piecewise local nonlinear phase compensation within a key time window, thereby improving the problem that traditional global phase compensation methods struggle to handle local time-varying phase disturbances.

[0017] 2. This invention determines the critical time window based on the energy distribution of the DAS pulse, and only performs segmented compensation on communication symbols that are significantly affected by the DAS pulse. It does not require high-complexity local processing on all communication symbols, thus reducing the computational complexity of the receiving end while ensuring the compensation effect.

[0018] 3. In one specific embodiment of the present invention, a blind phase search strategy is adopted, which obtains the local nonlinear phase compensation amount through candidate test phase, constellation decision and decision error measurement. It does not rely on the receiver knowing the transmitted symbols and their one-to-one correspondence in advance, and is suitable for actual unknown data transmission scenarios.

[0019] 4. This invention tracks the non-uniform nonlinear phase disturbances caused by DAS pulses at different times through a segmented mechanism within a key time window. This can alleviate the unilateral tailing, elliptical expansion, and asymmetric rotation distortion of communication constellation points, thereby improving the signal-to-noise ratio, Q factor, and bit error rate performance of communication signals.

[0020] 5. This invention is applicable to dual-polarization coherent communication systems, and can perform key time window identification and piecewise nonlinear phase compensation on the X-polarization component and Y-polarization component respectively after polarization demultiplexing.

[0021] 6. While improving the quality of communication reception, this invention retains the sensing and receiving branch of the DAS pulse, thus realizing the coexistence of communication transmission and distributed acoustic sensing within the same optical wavelength channel. Attached Figure Description

[0022] Figure 1 A schematic diagram of a DAS pulse and DSM communication signal co-wavelength fiber transmission system and a nonlinear noise segmentation compensation process. Figure 2 For different communication power ratios A schematic diagram illustrating the impact of piecewise nonlinear noise compensation on communication and sensing performance; whereby... Defined as the ratio of communication signal power to the total transmit power of the sensing system; Figure 3 This is a schematic diagram of the two-stage blind phase search structure for nonlinear noise compensation in this invention. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings. It should be understood that the following embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can adjust the system parameters, modulation format, DAS chirped pulse bandwidth, pulse width, number of subcarriers, guard interval, phase estimation method, critical time window width, and number of window segments.

[0024] This embodiment uses blind phase compensation as a specific implementation method for nonlinear phase noise compensation. The system structure used in this method is as follows: Figure 1 As shown, the system includes: a transmitter, a single-mode fiber optic link, a communication receiving branch, and a DAS sensor receiving branch. The transmitter includes a DSM communication subcarrier branch, a DAS pulse generation branch, and a co-wavelength multiplexing module; the communication receiving branch includes a coherent optical receiver, a global phase coarse compensation module, and a window-segmented nonlinear phase compensation module; the DAS sensor receiving branch is used to demodulate the backscattered signal of the DAS pulse.

[0025] This method can be adjusted according to different system parameters, modulation format, DAS pulse width, number of subcarriers, number of candidate test phases, phase estimation window length, and critical time window width. Specifically, the segmented compensation method for nonlinear noise in this shared-fiber inductive integrated transmission system, based on global phase compensation, determines the critical time window according to the energy characteristics of the DAS pulse, and performs segmented local phase compensation only on the communication symbols within the window, thereby reducing the impact of nonlinear phase noise on the communication signal while maintaining the DAS sensing function. Specifically, the method includes the following steps: Step 1: The transmitting end generates a signal for co-transmission on the same wavelength channel: Step 1.1: The DSM communication subcarrier branch maps and pulse-shapes the input information bits to generate the DSM communication subcarrier signal. In this embodiment, the number of DSM communication subcarriers is 2, and the symbol rate of each subcarrier is 30. The root-raised cosine filter roll-off factor is 0.01, and the spacing between adjacent subcarriers is set as follows: .

[0026] Step 1.2: The DAS pulse generation branch generates pulse signals for distributed acoustic sensing. In this embodiment, the bandwidth of the DAS chirped pulse is 300 MHz, and the pulse width is... It is 50 ns.

[0027] Step 1.3: The same wavelength frequency domain multiplexing module will convert the DSM communication subcarrier signals... and DAS pulse signal Multiplexing within the same optical carrier wavelength channel, and reserving a guard interval between the communication subcarrier signal and the pulse signal. In this embodiment, the frequency spacing of the guard interval is set as follows: .

[0028] Step 1.4: The transmitting end transmits the multiplexed signal from the same wavelength channel. Transmission is carried out via a single-mode fiber optic link, where: .

[0029] Step 2: The receiving end obtains the communication received symbol sequence affected by sensed pulse-induced nonlinear phase noise: Step 2.1: The communication receiving branch uses a coherent optical receiver to coherently receive the same-wavelength channel co-transmission signal transmitted via a single-mode fiber optic link. After electro-dispersion compensation, matched filtering, equalization, and symbol synchronization processing, the received symbol sequence is obtained. .

[0030] Step 2.2: Let the ideal constellation set corresponding to the modulation format used by the transmitter be... ,in The first in the constellation collection An ideal constellation point, For the order of the modulation constellation; the first Each received symbol is The received symbol sequence is represented as ,in, This represents the total number of symbols in the received symbol sequence. In this embodiment, the modulation format is 16QAM, i.e. =16. It should be noted that this embodiment uses blind phase compensation to achieve phase enhancement compensation; therefore, the phase estimation process does not require knowledge of the first... To determine the actual transmitted symbol corresponding to each received symbol, only the constellation set corresponding to the modulation format needs to be known. .

[0031] Step 2.3: Because DAS pulses have high peak power, during co-wavelength transmission with DSM communication signals over the same fiber, they will cause local time-varying nonlinear phase disturbances to the communication signals through fiber nonlinear effects such as cross-phase modulation and nonlinear polarization rotation. For example... Figure 1 As shown in the upper right constellation diagram, when the communication signal is significantly disturbed by the DAS pulse, the communication constellation points exhibit unilateral tailing, non-uniform expansion, or non-uniform rotational distortion. The corresponding phase difference distribution shows asymmetric characteristics, indicating that the nonlinear phase noise induced by the DAS pulse has obvious asymmetry.

[0032] Step 3, as follows Figure 3 As shown, global phase compensation is performed on the received symbol sequence: Step 3.1: Set the global phase estimation window length And based on the global phase estimation window, the received symbol sequence of the communication One or more of the following processes are performed: conventional carrier phase recovery, global blind phase compensation, frequency offset residual compensation, pilot-assisted phase estimation, or decision-assisted phase estimation, to obtain the global phase compensation result. In this embodiment, 75 symbols are available.

[0033] Step 3.2: Based on the global phase compensation results, process the received symbol sequence for communication. Phase rotation compensation is performed to obtain the globally compensated symbol sequence. ;in, For the first A symbol after global compensation.

[0034] Step 3.3: Global phase compensation is used to compensate for overall phase rotation, laser phase noise, residual frequency offset, or slowly changing phase disturbances. For local, time-varying nonlinear phase disturbances remaining in the DAS pulse peak region, they are handled by the segmented local compensation steps in the subsequent critical time window.

[0035] Step 4: Determine the critical time window for concentrated interference from DAS pulse nonlinear noise and segment the window accordingly: Step 4.1: Determine the time interval with larger amplitude within the pulse based on the energy distribution of the sensing pulse, and define this time interval as the critical time window. In this embodiment, the pulse width =50 ns, the peak power is concentrated in a local time interval after the pulse start, therefore this local time interval is determined as the critical time window. .

[0036] Step 4.2: Determine the key time window The set of symbol indices corresponding to the symbol sequence at the receiving end. .

[0037] Step 4.3: Set the symbol indexes Divided into A set of non-overlapping sub-segment indices And satisfy ;in, For the first The set of symbol indices contained in each sub-segment , The number of sub-segments.

[0038] Step 4.4: Based on the key time window Duration and communication symbol rate Calculate the total number of symbols in the window : .

[0039] Step 4.5: Set the critical time window The number of symbols contained in each sub-segment is And based on key time windows Total number of corresponding symbols Determine the number of segments In this embodiment, We can choose 30 symbols, making each segment shorter than the global phase estimation window length. This allows for more precise local phase compensation within the DAS pulse peak influence region.

[0040] Step 5, as follows Figure 3 As shown, for the key time window The communication symbols within the window perform segmented local compensation: Step 5.1, for the critical time window The first Sub-segment Set up local test phase set .in, For the number of local test phases, For the first The first sub-segment A local candidate test phase.

[0041] Step 5.2, for Each globally compensated communication symbol within Apply the first Local candidate test phases Rotation yields: , .

[0042] Step 5.3: Rotate the candidate symbols The judgment is a constellation set The closest constellation point in Central Euclidean distance: .

[0043] Step 5.4, calculate the first... Within each sub-segment, the first Intra-segment decision error metric corresponding to each local candidate test phase: ,in, The smaller the value, the better the candidate test phase. For the first The better the local compensation effect of communication symbols within a segment.

[0044] Step 5.5: Select the candidate test phase with the smallest decision error metric as the first... Local nonlinear phase compensation for each segment: , .

[0045] Step 5.6, for the first All communication symbols within a sub-segment are uniformly subject to local nonlinear phase compensation: if ,but .

[0046] Step 5.7, for Repeat steps 5.1 to 5.6 for each sub-segment to obtain the critical time window. The result of segmented compensation within the window.

[0047] Step 5.8: Define the key time window Compensation symbols and key time windows within The remaining communication symbols are merged to obtain the final segmented and compensated communication symbol sequence. , Indicates the first The symbols after segmented compensation.

[0048] Step 6: Output the communication symbol sequence after nonlinear noise piecewise compensation. And perform DAS sensor demodulation: Step 6.1: The communication receiving branch will receive the final compensated communication symbol sequence. The data is then fed into the subsequent demapping module to recover the information bits from the sending end and to calculate communication performance metrics such as SNR, Q factor, bit error rate, or generalized mutual information.

[0049] Step 6.2: The DAS sensor receiving branch performs photoelectric detection and demodulation on the backscattered signal of the common-propagation DAS pulse to obtain vibration information along the fiber distance and time distribution. For example... Figure 2 As shown, while the communication signal performs nonlinear noise piecewise compensation, the DAS sensing branch can still demodulate the vibration position and time information, indicating that the method can support the coexistence of communication and distributed acoustic sensing.

[0050] Step 6.3: For a dual-polarization coherent communication system, global blind phase compensation and window-segmented local blind phase compensation are applied to the X-polarization component and the Y-polarization component, respectively. The two polarization components each construct their own test phase set, decision error metric, global blind phase estimate, and local blind phase estimate, and independently complete phase rotation compensation.

[0051] Step 6.4: The method in this embodiment can alleviate the impact of asymmetric nonlinear phase noise caused by DAS pulse co-wavelength fiber transmission on the quality of communication signals, and can be used in conjunction with coherent optical communication digital signal processing modules such as electrical dispersion compensation, equalization, frequency offset estimation, conventional carrier phase recovery, and forward error correction decoding.

[0052] In this embodiment, an electronic device includes a memory and a processor. The memory stores a program that supports the processor in executing the blind phase compensation method described above. The processor is configured to execute the program stored in the memory.

[0053] In this embodiment, a computer-readable storage medium stores a computer program, which is executed by a processor to perform the steps of the above-described blind phase compensation method.

Claims

1. A segmented compensation method for nonlinear noise in a co-fiber inductive integrated transmission system, characterized in that, The procedure is as follows: Step 1: In the co-fiber inductive integrated transmission system, the transmitting end transmits the communication signal and the DAS pulse in the same optical wavelength channel through the co-fiber link to obtain a signal transmitted at the same wavelength. The receiving end coherently receives the co-transmitted signal at the same wavelength, and after processing with electro-dispersion compensation, matched filtering, and symbol synchronization, obtains the communication received symbol sequence. ;in, For the first One communication received symbol, The total number of symbols received in communication; Step 2: Receive the communication symbol sequence Perform global phase compensation to eliminate global phase rotation and slowly varying phase noise, resulting in a globally compensated symbol sequence. ;in, For the first A globally compensated symbol; Step 3: Based on the energy envelope distribution of the DAS pulse, the time interval during which the DAS pulse energy exceeds a preset threshold is taken as the critical time window. Thus, the key time window is determined. exist The corresponding symbol index set ; Step 4, Divided into A set of non-overlapping sub-segment indices And satisfy ;in, For the first The set of symbol indices contained in each sub-segment , The number of sub-segments; Step 5, for Performing local nonlinear phase compensation yields the first... The set of all locally compensated symbols in each sub-segment Thus, the key time window is obtained. The set of local compensation symbols for all sub-segments ; Step 6: Define the key time window external global compensation symbols With the set of local compensation symbols By merging, we obtain the segmented and compensated communication symbol sequence. ,in, Indicates the key time window The outside A globally compensated symbol Indicates the first The symbols after segmented compensation.

2. The segmented compensation method according to claim 1, characterized in that, In step 2, global phase compensation is implemented using a global blind phase search method, specifically by setting the length of the sliding window to... In length of Within the sliding window During the blind phase search, the global phase shift within the sliding window is estimated and compensated to obtain the globally compensated symbol sequence. .

3. The segmented compensation method according to claim 2, characterized in that, Number of sub-segments in step 4 The method for determining this is based on the key time window. Duration and communication symbol rate Calculate the critical time window Total number of internal symbols ; Set the number of symbols contained in each sub-segment. Then the number of sub-segments ;in, .

4. The segmented compensation method according to claim 3, characterized in that, Step 5 includes: Step 5.1, set the number A set of local candidate test phases ;in, For the first The first sub-segment One candidate test phase, The number of candidate test phases; Step 5.2, for The Middle The symbol after global compensation Apply the first Candidate test phases The rotation of , thus using equation (1) to obtain the first The first sub-segment After phase rotation of the candidate test phase candidate symbols : (1) In formula (1), Display imaginary numbers, ; Step 5.3, The ideal constellation set corresponding to the modulation format used from the decision to the sending end. The closest constellation point in Central Euclidean geometry ; Step 5.4: Calculate the first step using equation (2). Within each sub-segment, the first Intra-segment decision error metric for each candidate test phase : (2) Step 5.5, from Select the candidate test phase that minimizes the intra-segment decision error metric from among the candidate test phases. As the first Local nonlinear phase compensation amount of each segment : Step 5.6, for Apply The rotation of , thus using equation (3) to obtain the first The first sub-segment The symbol after local compensation : (3)。 5. The segmented compensation method according to claim 1, characterized in that, When the segmented compensation method is applied to a dual-polarization coherent communication system, steps 1 to 6 are executed independently for the X-polarization component and the Y-polarization component, respectively. Each polarization component constructs an independent candidate test phase set and decision error metric, and independently estimates and applies its own local nonlinear phase compensation amount.

6. A segmented compensation device for nonlinear noise in a co-fiber inductive integrated transmission system, used to implement the method of any one of claims 1 to 5, characterized in that, include: The coherent receiver module is used to coherently receive co-transmitted signals of the same wavelength after transmission via an optical fiber link. After processing including electrical dispersion compensation, matched filtering, and symbol synchronization, it outputs the communication received symbol sequence. ; The global phase compensation module is used to adjust the received symbol sequence of communication. Perform global phase compensation and output the globally compensated symbol sequence. ; The critical time window identification module is used to determine the critical time window based on the energy distribution of the DAS pulse. and its corresponding symbol index set ; The window segmentation local compensation module is used to segment the symbol index set. Divided into Each sub-segment undergoes a process involving candidate test phase rotation, constellation decision, and minimization of intra-segment decision error metric to obtain a local nonlinear phase compensation amount, which is used for... The corresponding globally compensated symbols are subjected to segment-by-segment local phase compensation, and this is synchronized with the key time window. The globally compensated symbols outside the segmented compensation communication symbol sequence form the overall communication symbol sequence. .

7. A shared-fiber inductive integrated transmission system, characterized in that, include: Transmitter, fiber optic link, communication receiving branch, and DAS sensor receiving branch; The transmitting end is used to multiplex the communication signal and the DAS pulse in the same optical wavelength channel and input them into the optical fiber link for transmission, so as to obtain a signal that is transmitted at the same wavelength. The communication receiving branch includes the segmentation compensation device of claim 6, and is used to process co-transmitted signals of the same wavelength and output a segmented compensation communication symbol sequence. ; The DAS sensor receiving branch is used to demodulate the backscattered signal of the common-transmission DAS pulse to obtain distributed sensing results.

8. An electronic device, comprising a memory and a processor, characterized in that, The memory is used to store a program that enables the processor to execute the method of any one of claims 1 to 5, and the processor is configured to execute the program stored in the memory.

9. A computer-readable storage medium storing a computer program thereon, characterized in that, The computer program is executed by the processor to perform the steps of any one of claims 1 to 5.

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