Optical network communication perception integration method and system based on carrier assistance

Abstract

The invention discloses an optical network communication perception integration method and system based on carrier assistance, and the method comprises the following steps: 1, a carrier generation module generates two linear frequency modulation optical signals with a constant frequency difference and the same phase, and the linear frequency modulation optical signals are divided into a perception carrier and a communication carrier according to the frequency through a fiber bragg grating 1; 2, a communication carrier is divided into two beams through an optical fiber coupler 1, one beam serves as a reference optical signal to be input into a sensing receiving module, the other beam serves as a carrier to be input into an in-phase quadrature modulator, and a communication electric signal generated by an arbitrary waveform generator is modulated on the carrier through the modulator to generate a communication optical signal; 3, the sensing carrier and the communication optical signal are input into an optical fiber coupler 2 to generate a communication and sensing integrated optical signal, and the communication and sensing integrated optical signal is input into an optical fiber link through a circulator; and 4, inputting a signal received by the optical fiber link into a communication receiving module, and inputting a backward optical signal output by the circulator into a sensing receiving module.

Description

Technical Field

[0001] The present invention belongs to the field of optical communication computing, and particularly relates to a communication and sensing integration method and system for an optical network transmission system. Background Art

[0002] In recent years, with the rapid development of emerging network service technologies such as cloud computing, the Internet of Things, and virtual reality, the global network traffic has grown explosively. Traditional cable-based transmission solutions can no longer meet the users' demands for high-speed, large-bandwidth, and low-latency networks. Due to its advantages such as low loss, large bandwidth, and strong electromagnetic interference resistance, optical fiber has replaced cables as the transmission medium and is applied in transoceanic communication, backbone networks, metropolitan area networks, and fiber to the home. The intelligent management and health detection of such large-scale infrastructures have gradually become new challenges. In addition, with the emergence of emerging technologies such as smart cities and telemedicine, the stable combination of high-quality communication and high-precision sensing has become a new demand. At the same time, since the potential of the optical fiber's own sensing function has been explored, the integrated sensing and communication on optical fiber (ISAC-OF) technology has emerged. The ISAC-OF technology realizes the organic combination of communication and sensing functions by applying various technical means on the same optical fiber link, so as to more effectively utilize the limited system resources. Through this technology, the existing optical fiber network will, on the basis of maintaining its original communication ability, have the ability to sense itself and the surrounding environment, thus making network management more intelligent and network services more diversified. However, the ISAC-OF technology still faces many challenges, such as problems such as system performance degradation caused by communication and sensing signal crosstalk and system resource allocation trade-offs. Therefore, how to reduce signal crosstalk and reasonably allocate resources in the ISAC-OF system to improve system performance is an important research issue.

[0003] After retrieving the existing literature, it can be seen that for the above problems, in the current ISAC-OF system design, the design of integrated waveforms and system architectures is the main research direction. Among them, Haijun He1 et al. published "Integrated sensing and communication in an optical fibre" in "Light: Science & Applications" in 2023. The paper proposed using a chirped signal as the carrier, which can achieve high-speed optical communication and fiber vibration monitoring simultaneously under the same wavelength channel. By combining the intensity modulation direct detection (IMDD) technology with the phase-sensitive optical time-domain reflectometer (Φ-OTDR), the organic integration of high-speed communication and high-precision sensing under the fiber is realized. In addition, J. Tang et al. proposed a distributed fiber optic sensing method based on forward transmission in 2024. This method is compatible with the C+L band unidirectional communication system, and vibration sensing is achieved by detecting the polarization state difference of two-wavelength signals at the communication receiving end. However, the above solutions have weak performance in terms of system transmission distance, sensing accuracy, transmission rate, etc., and poor performance in anti-channel frequency offset interference. Therefore, for the communication and sensing integrated system under the fiber, the present invention proposes an integrated design scheme for optical network communication and sensing based on carrier assistance. Summary of the Invention

[0004] Aiming at the problems of the backward performance of the current communication and sensing integrated system under the fiber and poor anti-channel frequency offset interference performance, the present invention provides a method and system for integrated optical network communication and sensing based on carrier assistance. The present invention is based on the auxiliary carrier technology, combined with coherent optical communication and optical frequency domain reflectometer (OFDR), to improve the robustness of the system to channel frequency offset and realize a communication and sensing integrated system under the fiber with longer distance, higher precision and faster rate.

[0005] The present invention adopts the following technical solutions:

[0006] An integrated optical network communication and sensing method based on carrier assistance, the specific steps are as follows:

[0007] Step 1: At the signal transmitting end, the carrier generation module generates two linearly frequency modulated (LFM) optical signals with a constant frequency difference and the same phase. These signals are divided into a sensing carrier and a communication carrier by Fiber Bragg Grating 1 according to frequency. Among them, the center frequencies of the sensing carrier and the communication carrier are v s and v c ;

[0008] Step 2: The communication carrier in Step 1 is divided into two beams by Fiber Coupler 1. One beam is input into the sensing receiving module as a reference optical signal, and the other beam is input into the In-phase and Quadrature (IQ) modulator as a carrier. The communication electrical signal generated by an arbitrary waveform generator is modulated onto this carrier by this modulator to generate a communication optical signal.

[0009] Step 3: The sensing carrier in Step 1 and the communication optical signal in Step 2 are input into Fiber Coupler 2 to generate an integrated communication and sensing optical signal, which is input into the optical fiber link through an optical circulator.

[0010] Step 4: The signal received at the end of the optical fiber link is input into the communication receiving module to receive communication information, and the backward optical signal output by the circulator is input into the sensing receiving module to calculate the channel frequency offset and receive sensing information.

[0011] Further, in the carrier generation module of Step 1, a continuous optical signal is generated by a continuous wave laser, and its frequency is v 0 . The LFM electrical signal generated by an arbitrary waveform generator is modulated onto this continuous optical signal by an optical intensity modulator, and an LFM optical signal is generated through an optical bandpass filter 1. Then, the sine signal with a fixed frequency of f ω generated by an arbitrary waveform generator is modulated onto this LFM optical signal by an optical phase modulator, and two LFM optical signals with a constant frequency difference and the same phase are generated through an optical bandpass filter 2.

[0012] Further, in Step 1, the center frequency f FBG1 of the reflection passband of Fiber Bragg Grating 1 = v c , and the passband bandwidth B FBG1 satisfies: B < B FBG1 < B + f ω , that is: the center frequency of the reflection passband of Fiber Bragg Grating 1 should be the same as the center frequency of the communication carrier, the passband bandwidth should be greater than the bandwidth of a single LFM carrier, and at the same time less than the sum of the bandwidth of a single LFM carrier and the frequency interval between the two carriers. Using the reflection bandpass characteristic and transmission bandstop characteristic of the fiber Bragg grating as an optical filter, the communication carrier is reflected as a backward optical signal, and at the same time the sensing carrier is transmitted as a forward optical signal, so as to accurately separate the two LFM signals.

[0013] Further, in step 2, the bandwidth B of the generated communication optical signal c satisfies: B c < B + 2f ω , that is: the bandwidth of the generated communication optical signal should be less than the sum of the bandwidth of a single LFM carrier and twice the frequency interval between two carriers. By reserving a frequency protection interval in the frequency domain, aliasing between the communication signal and the sensing signal is prevented, thereby reducing the interference between the communication and sensing signals.

[0014] Further, in step 4, the communication receiving module separates the received optical signal into an auxiliary carrier and a communication optical signal through a fiber Bragg grating 2; the center frequency f of the reflection passband of the fiber Bragg grating 2 FBG2 = v s , and the passband bandwidth b FBG2 satisfies: b < B FBG2 < f ω - 0.5b c , that is: the center frequency of the reflection passband of the fiber Bragg grating 2 should be the same as the center frequency of the sensing carrier, that is, the same as the center frequency of the auxiliary carrier. The passband bandwidth should be greater than the bandwidth of a single LFM carrier and at the same time less than the difference between the frequency interval between two carriers and half of the bandwidth of the communication optical signal. Using the reflection band-pass characteristic and transmission band-stop characteristic of the fiber Bragg grating as an optical filter, the sensing carrier, that is, the auxiliary carrier, is reflected as the backward light, and at the same time the communication optical signal is transmitted as the forward light, thereby accurately separating the two LFM signals.

[0015] Further, in the communication receiving module of step 4, a sine signal generated by an arbitrary waveform generator and having the same frequency (f ω ) as that in the carrier generation module is modulated onto the auxiliary carrier through an acousto-optic modulator to realize frequency shift of the auxiliary carrier so that its center frequency is the same as the center frequency v of the communication signal c . Then, the communication signal and the frequency-shifted auxiliary carrier are input into a 90-degree optical mixer to realize coherent reception, and photoelectric conversion is realized by two groups of balanced detectors, and then digital signal processing is performed through a digital signal processing module to realize the reception of communication information.

[0016] Further, in the sensing receiving module of step 4, the received backward optical signal is filtered by an optical band-pass filter 3 to obtain the sensing carrier as the sensing received signal. Among them, the center frequency f of the optical band-pass filter 3 BPF3 = v s , and the passband bandwidth B BPF3 satisfies: B < B BPF3 < B + f ωThat is, the center frequency of the passband of the optical bandpass filter 3 should be the same as the center frequency of the sensing carrier, and the passband bandwidth should be greater than the bandwidth of a single LFM carrier and less than the sum of the bandwidth of a single LFM carrier and the frequency interval between the two carriers, so as to separate the component corresponding to the sensing carrier in the backscattered optical signal. The sensing received signal and the reference optical signal are input into an optical fiber coupler to achieve coherent reception, and an optical-to-electrical conversion is achieved by a balanced detector. Due to the square detection principle and the bandpass effect of the detector, the obtained electrical signal is the difference frequency signal of the two optical signals. Then, the electrical signal is subjected to digital signal processing through a second digital signal processing module to achieve the reception of sensing information.

[0017] The present invention also discloses an optical network communication and sensing integrated system based on carrier assistance, including a carrier generation module, a fiber Bragg grating 1, an optical fiber coupler 1, an arbitrary waveform generator, an IQ modulator, an optical fiber coupler 2, an optical circulator, an optical fiber link, a communication receiving module, and a sensing receiving module;

[0018] The carrier generation module at the signal transmitting end generates two LFM optical signals with a constant frequency difference and the same phase. The optical signal is divided into a sensing carrier and a communication carrier by the fiber Bragg grating 1 according to frequency; wherein, the center frequencies of the sensing carrier and the communication carrier are v s and v c ;

[0019] The communication carrier is divided into two beams by the optical fiber coupler 1. One beam is used as a reference optical signal and input into the sensing receiving module, and the other beam is used as a carrier and input into the IQ modulator. The communication electrical signal generated by the arbitrary waveform generator is modulated onto the carrier by the IQ modulator to generate a communication optical signal;

[0020] The sensing carrier and the communication optical signal are input into the optical fiber coupler 2 to generate a communication and sensing integrated optical signal, and are input into the optical fiber link through the optical circulator;

[0021] The signal received by the optical fiber link is input into the communication receiving module to achieve the reception of communication information, and the backscattered optical signal output by the circulator is input into the sensing receiving module to achieve the calculation of the channel frequency offset and the reception of sensing information.

[0022] Preferably, in the carrier generation module, a continuous optical signal is generated by a continuous wave laser. The LFM electrical signal generated by a second arbitrary waveform generator is modulated onto the continuous optical signal by an optical intensity modulator, and an LFM optical signal is generated through an optical bandpass filter 1; the fixed-frequency sine signal generated by the second arbitrary waveform generator is modulated onto the LFM optical signal by an optical phase modulator, and two LFM optical signals with a constant frequency difference and the same phase are generated through an optical bandpass filter 2.

[0023] Preferably, in the communication receiving module, the sine signal generated by the third arbitrary waveform generator and having the same frequency as that in the carrier generation module is modulated onto the auxiliary carrier through an acousto-optic modulator to achieve frequency shift of the auxiliary carrier, so that its center frequency is the same as the center frequency of the communication signal; the communication signal and the frequency-shifted auxiliary carrier are input into a 90-degree optical mixer to achieve coherent reception, and two sets of balanced detectors are used to achieve optoelectronic conversion, and digital signal processing is performed by a digital signal processing module to achieve reception of communication information.

[0024] Preferably, in the sensing receiving module, the received backward optical signal is filtered by an optical bandpass filter 3 to obtain a sensing carrier as a sensing receiving signal; this signal and the reference optical signal are input into an optical fiber coupler to achieve coherent reception, and a second balanced detector is used to achieve optoelectronic conversion, and digital signal processing is performed by a second digital signal processing module to achieve reception of sensing information.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Strong robustness to link frequency offset: By introducing the auxiliary carrier technology, the present invention can reduce the software and hardware costs of the communication receiving end for carrier frequency recovery at the communication receiving end and the sensing receiving end; at the same time, the link frequency offset amount can be obtained through simple calculation at the sensing receiving end, thereby solving the problem of excessive OFDR positioning error caused by link frequency offset and improving the sensing accuracy of the system.

[0027] 2. Far system link coverage: The present invention uses coherent communication technology to replace the intensity modulation technology in the existing solution, improving the robustness of the system to link interference and power fading, thereby increasing the link coverage of the system and realizing the integrated function of communication and sensing over a longer distance.

[0028] 3. High system sensing accuracy: The present invention uses OFDR technology to replace the optical time-domain reflectometer (OTDR) technology in the existing solution, demodulating and analyzing the sensing signal in the frequency domain, thereby avoiding the problem of limited sensing accuracy of OTDR and improving the sensing accuracy of the system. Description of the Drawings

[0029] Figure 1 is the system block diagram related to the preferred embodiment of the present invention;

[0030] Figure 2 is the block diagram of the carrier generation module related to the preferred embodiment of the present invention.

[0031] Figure 3 is the block diagram of the communication receiving module related to the preferred embodiment of the present invention.

[0032] Figure 4 It is a block diagram of the sensing receiving module involved in the preferred embodiment of the present invention. Specific embodiments

[0033] To more clearly illustrate the embodiments of the present invention, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can be obtained.

[0034] Embodiment 1:

[0035] As Figure 1 shown, this embodiment proposes an integrated method for optical network communication sensing based on carrier assistance. The specific steps are as follows:

[0036] Step 1: At the signal transmitting end, the carrier generation module generates two LFM optical signals with a constant frequency difference and the same phase. This signal is divided into a sensing carrier and a communication carrier by Fiber Bragg Grating 1 according to frequency. Among them, the center frequencies of the sensing carrier and the communication carrier are v s and v c .

[0037] Step 2: The communication carrier in Step 1 is divided into two beams by Fiber Coupler 1. One beam is input into the sensing receiving module as a reference optical signal, and the other beam is input into the IQ modulator as a carrier. The communication electrical signal generated by an arbitrary waveform generator is modulated on this carrier by this modulator to generate a communication optical signal.

[0038] Step 3: Input the sensing carrier in Step 1 and the communication optical signal in Step 2 into Fiber Coupler 2 to generate an integrated communication and sensing optical signal, and input it into the optical fiber link through an optical circulator.

[0039] Step 4: Input the signal received at the end of the optical fiber link into the communication receiving module to receive communication information, and input the backward optical signal output by the circulator into the sensing receiving module to calculate the channel frequency offset and receive sensing information. The specific calculation process of the channel frequency offset is as follows: The backward optical signal is input into the sensing receiving module, and after passing through the optical bandpass filter 3, the sensing received signal is output. Its optical field e s (t) is expressed as:

[0040]

[0041] where E s is the intensity of the sensing received signal, v 1 is the starting frequency of the LFM optical signal, f sis the channel frequency offset, T is the chirp period of the LFM signal, τ is the signal delay, and i is the imaginary unit. The optical field E of the reference optical signal 0 is expressed as:

[0042]

[0043] where E 0 is the intensity of the reference optical signal. The two signals are input into an optical fiber coupler and are photoelectrically converted by a balanced detector, and the photocurrent I at the moment when the frequency is constant is output s is expressed as:

[0044]

[0045] where A is the amplitude of the photocurrent signal. The frequency of the photocurrent is analyzed in segments, and the frequencies of the two segments of signals are respectively: f 1 = 2Bτ / T - f s , f 2 = 2Bτ / T + f s , then the channel frequency offset can be obtained through f s = |f 1 - f 2 | / 2.

[0046] The carrier generation module of this embodiment is as Figure 2 shown. A continuous optical signal is generated by a continuous wave laser, and its frequency is v 0 . The LFM electrical signal generated by an arbitrary waveform generator is modulated onto this continuous optical signal through an optical intensity modulator, and the first upper sideband is filtered out through an optical bandpass filter 1 to generate an LFM optical signal, whose frequency range is [v 0 + f 0 , v 0 + f 0 + B]. Wherein, f 0 and B are respectively the starting frequency and bandwidth of the LFM electrical signal. Then, the sine signal with a fixed frequency of f ω generated by an arbitrary waveform generator is modulated onto this LFM optical signal through an optical phase modulator, and two LFM optical signals with a constant frequency difference of f ω and the same phase are filtered out through an optical bandpass filter 2.

[0047] In step 1 of this embodiment, the center frequency f FBG1 of the passband of fiber Bragg grating 1 = v s , and the passband bandwidth B FBG1 should satisfy: f < B F0G1 < B + f ω to accurately separate the two LFM signals.

[0048] In step 2 of this embodiment, the bandwidth B of the generated communication optical signal c should satisfy: B c < B + 2f ω , so as to reduce the interference between the communication and sensing signals.

[0049] The communication receiving module of this embodiment is as Figure 3 shown. It separates the received optical signal into an auxiliary carrier and a communication optical signal through a fiber Bragg grating 2. The center frequency f FBG2 of the fiber Bragg grating 2 = v c , and the passband bandwidth B FBG2 should satisfy: B c < B FBG2 < B + 2f ω . A sine signal with a fixed frequency f ω generated by an arbitrary waveform generator is modulated onto the auxiliary carrier through an acousto-optic modulator to realize frequency shift of the auxiliary carrier, so that its center frequency is the same as the center frequency v c of the communication signal. Then, the communication signal and the frequency-shifted auxiliary carrier are input into a 90-degree optical mixer to realize coherent reception, and are photoelectrically converted by two groups of balanced detectors, and then digital signal processing is performed through a digital signal processing module to realize the reception of communication information.

[0050] The sensing receiving module of this embodiment is as Figure 3 shown. The received backward optical signal is filtered by an optical band-pass filter 3 to filter out the sensing carrier as the sensing received signal. Among them, the center frequency f BPF3 of the optical band-pass filter 3 = v s , and the passband bandwidth B BPF3 should satisfy: B < B BPF3 < B + f ω . This signal and the reference optical signal are input into an optical fiber coupler to realize coherent reception, and are photoelectrically converted by a balanced detector, and then digital signal processing is performed through a digital signal processing module to realize the reception of sensing information.

[0051] Embodiment 2

[0052] As Figures 1-4As shown in the figure, this embodiment discloses an integrated system for optical network communication and sensing based on carrier assistance. The system includes a signal transmitter, a communication receiving module, and a sensing receiving module. The signal transmitter consists of a carrier generation module, an arbitrary waveform generator, an IQ modulator, a fiber Bragg grating 1, and an optical fiber coupler, etc. Two LFM optical signals with a constant frequency difference and the same phase generated by the carrier generation module are divided into a sensing carrier and a communication carrier by the fiber Bragg grating 1 according to frequency. Among them, the communication carrier separates the reference optical signal through the optical fiber coupler. Then, the IQ modulator modulates the communication electrical signal generated by the arbitrary waveform generator onto the remaining carrier to generate a communication optical signal, which is coupled with another carrier through the optical fiber coupler and then input into the optical fiber link through the circulator. The communication receiving module consists of a fiber Bragg grating 2, an acousto-optic modulator, an arbitrary waveform generator, a 90-degree optical mixer, a balanced detector, and a digital signal processing module, etc. Among them, the Bragg grating 2 is used to separate the communication optical signal and the auxiliary carrier. After the arbitrary waveform generator and the acousto-optic modulator shift the frequency of the auxiliary carrier to a suitable position, it is input into the 90-degree optical mixer together with the communication optical signal, and the received communication information is obtained through the balanced detector and the digital signal processing module. The sensing receiving module consists of an optical band-pass filter, an optical fiber coupler, a balanced detector, and a digital signal processing module, etc. Among them, the optical band-pass filter is used to filter out the auxiliary carrier in the backward optical signal as the sensing receiving signal, and it is input into the optical fiber coupler together with the reference optical signal, and the received sensing information is obtained through the balanced detector and the digital signal processing module.

[0053] For other contents of this embodiment, reference can be made to Embodiment 1.

[0054] In summary, through the carrier assistance technology, the present invention combines coherent optical communication with an optical frequency domain reflectometer, which can effectively improve the robustness of the system to frequency offset and improve the communication and sensing performance of the system.

[0055] It should be noted that the above is only a detailed description of the preferred embodiments and principles of the present invention. For those of ordinary skill in the art, according to the idea provided by the present invention, there will be changes in the specific implementation manners, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A carrier-assisted optical network communication perception integrated method, characterized in that: Follow these steps: Step 1: At the signal transmitting end, the carrier generation module generates two LFM optical signals with a constant frequency difference and the same phase. The optical signal is divided into a sensing carrier and a communication carrier according to the frequency through the fiber Bragg grating 1; wherein the center frequencies of the sensing carrier and the communication carrier are v s With v c ; Step 2: The communication carrier in step 1 is divided into two beams through the optical fiber coupler 1, one beam is input into the sensing receiving module as a reference optical signal, and the other beam is input into the IQ modulator as a carrier, and the communication electrical signal generated by the arbitrary waveform generator is modulated on the carrier through the IQ modulator to generate a communication optical signal; Step 3: Input the sensing carrier in step 1 and the communication optical signal in step 2 into the optical fiber coupler 2 to generate a communication sensing integrated optical signal, and input it into the optical fiber link through the optical circulator; Step 4: Input the signal received by the optical fiber link into the communication receiving module to realize the reception of communication information, and input the backlight signal output by the circulator into the perception receiving module to realize the calculation of channel frequency deviation and the reception of perception information.

2. The carrier-assisted optical network communication perception integrated method according to claim 1, characterized in that: In the carrier generation module of step 1, a continuous wave optical signal is generated by a continuous wave laser, and its frequency is v0. The LFM electrical signal generated by the arbitrary waveform generator is modulated onto the continuous wave optical signal through an optical intensity modulator, and the first upper sideband is filtered out through an optical bandpass filter 1 to generate an LFM optical signal, and its frequency range is [v0+f0, v0+f0+B]; wherein f0 and B are the starting frequency and bandwidth of the LFM electrical signal, respectively; then, the fixed frequency f generated by the arbitrary waveform generator is ω The sinusoidal signal is modulated onto the LFM optical signal by an optical phase modulator, and is filtered out by an optical bandpass filter 2 to obtain two signals with a constant frequency difference of f. ω LFM optical signals with the same phase.

3. The integrated method for optical network communication perception based on carrier assistance according to claim 2 is characterized in that: step 1, the reflection passband center frequency f of the fiber Bragg grating 1 is FBG1 =v c , passband bandwidth B FBG1 Satisfaction: B FBG1 <B+f ω .​ 4. The carrier-assisted optical network communication perception integrated method according to claim 3, characterized in that: In step 2, the generated communication optical signal bandwidth B c Satisfaction: B c <B+2f ω .

5. The carrier-assisted optical network communication perception integrated method according to claim 4 is characterized in that: In step 4, the communication receiving module separates the received optical signal into an auxiliary carrier and a communication optical signal through the fiber Bragg grating 2; the passband center frequency f FBG2 =v s , passband bandwidth B FBG2 Satisfaction: B FBG2 <f ω -0.5B c .​ 6. The carrier-assisted optical network communication perception integrated method according to claim 5 is characterized in that: In the communication receiving module of step 4, the fixed frequency generated by the second arbitrary waveform generator is f ω The sinusoidal signal is modulated onto the auxiliary carrier through an acousto-optic modulator to achieve the frequency shift of the auxiliary carrier so that its center frequency is consistent with the center frequency v of the communication signal. c The same; then, the communication signal and the frequency-shifted auxiliary carrier are input into a 90-degree optical mixer to achieve coherent reception, and two sets of balanced detectors are used to achieve photoelectric conversion, and then digital signal processing is performed through a digital signal processing module to achieve reception of communication information.

7. The carrier-assisted optical network communication perception integrated method according to claim 6 is characterized in that: In the sensing receiving module of step 4, the received back-light signal is filtered out through the optical bandpass filter 3 to obtain the sensing carrier as the sensing receiving signal; wherein the center frequency of the optical bandpass filter 3 is f BPF3 =v s , passband bandwidth B BPF3 Satisfaction: B BPF3 <B+f ω The signal and the reference optical signal are input into the optical fiber coupler to realize coherent reception, and the photoelectric conversion is realized by the third balanced detector, and then the digital signal is processed by the second digital signal processing module to realize the reception of the perception information.​ 8. The integrated system of optical network communication perception based on carrier assistance is characterized by: It includes a carrier generation module, a fiber Bragg grating 1, a fiber coupler 1, an arbitrary waveform generator, an IQ modulator, a fiber coupler 2, an optical circulator, an optical fiber link, a communication receiving module and a sensing receiving module; The carrier generation module at the signal transmitting end generates two LFM optical signals with a constant frequency difference and the same phase. The optical signal is divided into a sensing carrier and a communication carrier according to the frequency through the fiber Bragg grating 1; wherein the center frequencies of the sensing carrier and the communication carrier are v s With v c ; The communication carrier is divided into two beams through the optical fiber coupler 1, one beam is input into the sensing receiving module as a reference optical signal, and the other beam is input into the IQ modulator as a carrier, and the communication electrical signal generated by the arbitrary waveform generator is modulated on the carrier through the IQ modulator to generate a communication optical signal; The sensing carrier and the communication optical signal are input into the optical fiber coupler 2 to generate a communication sensing integrated optical signal, and then input into the optical fiber link through the optical circulator; The signal received by the optical fiber link is input into the communication receiving module to realize the reception of communication information, and the backlight signal output by the circulator is input into the perception receiving module to realize the calculation of channel frequency deviation and the reception of perception information.

9. The carrier-assisted optical network communication perception integrated system according to claim 8, characterized in that: In the carrier generation module, a continuous wave optical signal is generated by a continuous wave laser, the LFM electrical signal generated by the second arbitrary waveform generator is modulated onto the continuous wave optical signal through an optical intensity modulator, and the LFM optical signal is generated through an optical bandpass filter 1; the fixed frequency sinusoidal signal generated by the second arbitrary waveform generator is modulated onto the LFM optical signal through an optical phase modulator, and two LFM optical signals with a constant frequency difference and the same phase are generated through an optical bandpass filter 2.

10. The carrier-assisted optical network communication perception integrated system according to claim 8 or 9, characterized in that: In the communication receiving module, the sinusoidal signal generated by the third arbitrary waveform generator and having the same frequency as that in the carrier generating module is modulated onto the auxiliary carrier through an acousto-optic modulator to achieve frequency shift of the auxiliary carrier so that its center frequency is the same as the center frequency of the communication signal; the communication signal and the auxiliary carrier after frequency shift are input into a 90-degree optical mixer to achieve coherent reception, and two sets of balanced detectors are used to achieve photoelectric conversion, and digital signal processing is performed through a digital signal processing module to achieve reception of communication information; In the perception receiving module, the received backlight signal is filtered out through the optical bandpass filter 3 to obtain the perception carrier as the perception receiving signal; the signal and the reference optical signal are input into the optical fiber coupler to realize coherent reception, and the photoelectric conversion is realized by the second balanced detector, and the digital signal processing is performed by the second digital signal processing module to realize the reception of perception information.

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