Fiber optic parameter measurement method, device and computer equipment based on Brillouin scattering

Abstract

The present application relates to a method, device, and computer equipment for measuring fiber optic parameters based on Brillouin scattering. The method includes: modulating the laser emitted by a laser by means of an electro-optic modulator to obtain a pump light and a probe light; controlling the pump light and the probe light to enter the single-mode fiber to be measured from both ends of the single-mode fiber to be measured respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal; and measuring the temperature parameter and strain parameter of the single-mode fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal. By using this method, the temperature parameter and strain parameter of the optical fiber can be measured simultaneously more accurately and efficiently.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber sensing, and in particular, to a method, device, and computer device for measuring optical fiber parameters based on Brillouin scattering. Background Art

[0002] Distributed optical fiber sensors rely on existing optical fiber networks and can achieve distributed temperature and strain sensing, with advantages such as small size, light weight, and resistance to extreme environments. Since distributed optical fiber sensing technology based on Brillouin scattering, such as Brillouin optical time-domain analysis technology (abbreviated as BOTDA), has higher measurement accuracy, measurement range, and spatial resolution in temperature and strain measurements than other distributed optical fiber sensing technologies, this technology has received extensive attention and research at present and has also been well applied to tunnel deformation monitoring, dam structural health monitoring, and large civil engineering structural health monitoring, etc.

[0003] However, the current method of measuring the temperature and strain of optical fibers based on Brillouin scattering has problems of low accuracy and inability to demodulate dual parameters simultaneously. This makes it impossible to further significantly improve the performance indicators of distributed sensing systems based on Brillouin scattering, and also makes it impossible for this technology to be commercialized on a large scale. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a method, device, and computer device for measuring optical fiber parameters based on Brillouin scattering, which can measure the temperature parameter and strain parameter of the optical fiber more accurately and efficiently simultaneously.

[0005] In a first aspect, the present application provides a method for measuring optical fiber parameters based on Brillouin scattering, including:

[0006] Modulating the laser emitted by the laser by an electro-optic modulator to obtain a pump light and a probe light;

[0007] Controlling the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured, respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0008] Measuring the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0009] In one of the embodiments, modulating the laser emitted by the laser by an electro-optic modulator to obtain a pump light and a probe light includes:

[0010] The laser light emitted by the laser is divided into a first laser light and a second laser light through an optical fiber coupler; wherein, the powers of the first laser light and the second laser light are the same;

[0011] The first path of pulse signal output by the sine segment module drives the first electro-optic modulator to modulate the first laser light, obtaining a pump light containing two frequency components;

[0012] The microwave signal output by the microwave source module drives the second electro-optic modulator to modulate the second laser light, obtaining a probe light.

[0013] In one embodiment, both ends of the single-mode optical fiber to be measured include a first end and a second end. Controlling the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, obtaining a forward Brillouin scattering signal and a backward Brillouin scattering signal, including:

[0014] The pump light is amplified through an erbium-doped fiber amplifier, and the amplified pump light is input into the single-mode optical fiber to be measured from the first end of the single-mode optical fiber to be measured, obtaining a forward Brillouin scattering signal;

[0015] The probe light is depolarized through an orthogonal depolarizer, and the depolarized probe light is input into the single-mode optical fiber to be measured from the second end of the single-mode optical fiber to be measured, obtaining a backward Brillouin scattering signal.

[0016] In one embodiment, according to the forward Brillouin scattering signal and the backward Brillouin scattering signal, measuring the temperature parameter and the strain parameter of the single-mode optical fiber to be measured, including:

[0017] The second path of pulse signal output by the sine segment module drives the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal;

[0018] According to the acquired electrical signals, constructing a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal;

[0019] According to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, measuring the temperature parameter and the strain parameter of the single-mode optical fiber to be measured.

[0020] In one embodiment, the second path of pulse signal output by the sine segment module drives the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal, including:

[0021] The forward Brillouin scattering signal and the backward Brillouin scattering signal are filtered through an optical fiber grating filter, obtaining a lower sideband signal;

[0022] The lower sideband signal is converted into an electrical signal through a photodetector;

[0023] The acquisition card is driven by the second pulse signal output by the sine segment module to acquire the electrical signal.

[0024] In one embodiment, the temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, including:

[0025] Data fitting is performed on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum;

[0026] The temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured according to the two-parameter matrix equation, the forward Brillouin frequency shift, and the backward Brillouin frequency shift.

[0027] In a second aspect, the present application further provides an optical fiber parameter measurement device based on Brillouin scattering, including:

[0028] A laser modulation module, configured to modulate the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light;

[0029] A signal acquisition module, configured to control the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0030] A parameter measurement module, configured to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0031] In a third aspect, the present application further provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0032] The laser emitted by the laser is modulated through an electro-optic modulator to obtain a pump light and a probe light;

[0033] Control the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0034] The temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0035] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0036] The laser light emitted by the laser is modulated by an electro-optic modulator to obtain pump light and probe light;

[0037] The pump light and the probe light are controlled to enter the single-mode optical fiber under test from both ends of the single-mode optical fiber under test respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0038] According to the forward Brillouin scattering signal and the backward Brillouin scattering signal, the temperature parameter and the strain parameter of the single-mode optical fiber under test are measured.

[0039] In a fifth aspect, the present application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0040] The laser light emitted by the laser is modulated by an electro-optic modulator to obtain pump light and probe light;

[0041] The pump light and the probe light are controlled to enter the single-mode optical fiber under test from both ends of the single-mode optical fiber under test respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0042] According to the forward Brillouin scattering signal and the backward Brillouin scattering signal, the temperature parameter and the strain parameter of the single-mode optical fiber under test are measured.

[0043] In the above-mentioned fiber parameter measurement method, device and computer equipment based on Brillouin scattering, by controlling the pump light and the probe light obtained by modulating the laser light emitted by the laser by the electro-optic modulator to enter the single-mode optical fiber under test from both ends of the single-mode optical fiber under test respectively, a forward Brillouin scattering signal and a backward Brillouin scattering signal can be obtained; and then according to the forward Brillouin scattering signal and the backward Brillouin scattering signal, the temperature parameter and the strain parameter of the single-mode optical fiber under test are measured. Compared with the prior art, in which only the distributed optical fiber sensing technology based on backward Brillouin scattering is used to measure the temperature parameter or the strain parameter of the optical fiber under test respectively, in the above-mentioned solution, by controlling the pump light and the probe light to enter the single-mode optical fiber under test from both ends of the single-mode optical fiber under test respectively, the forward Brillouin scattering signal and the backward Brillouin scattering signal can be obtained accurately and efficiently, and then the effect of measuring the temperature parameter and the strain parameter of the single-mode optical fiber under test simultaneously with high efficiency and accuracy can be achieved. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0045] Figure 1 is the internal structure diagram of the fiber optic sensing system in an embodiment;

[0046] Figure 2 is the schematic flow chart of the fiber optic parameter measurement method based on Brillouin scattering in an embodiment;

[0047] Figure 3 is the schematic flow chart of the process for obtaining the pump light and the probe light in an embodiment;

[0048] Figure 4 is the schematic flow chart of the process for obtaining the Brillouin scattering signal in an embodiment;

[0049] Figure 5 is the schematic flow chart of the process for measuring the parameters of the single-mode optical fiber to be measured in an embodiment;

[0050] Figure 6 is the schematic flow chart of the fiber optic parameter measurement method based on Brillouin scattering in another embodiment;

[0051] Figure 7 is the structural block diagram of the fiber optic parameter measurement device based on Brillouin scattering in an embodiment;

[0052] Figure 8 is the structural block diagram of the fiber optic parameter measurement device based on Brillouin scattering in another embodiment;

[0053] Figure 9 is the structural block diagram of the fiber optic parameter measurement device based on Brillouin scattering in yet another embodiment;

[0054] Figure 10 is the structural block diagram of the fiber optic parameter measurement device based on Brillouin scattering in still another embodiment;

[0055] Figure 11 is the internal structure diagram of the computer device in an embodiment. Detailed implementation manners

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0057] The fiber parameter measurement method based on Brillouin scattering provided by the embodiments of the present application can be applied to the scenario of simultaneously measuring the temperature parameter and strain parameter of a single-mode optical fiber to be measured. Optionally, this method can be executed by a control device. Among them, the control device is a controller or server that can control the operation of various devices (such as exciters, electro-optic modulators, etc.). The control device can interact with the fiber optic sensing system, control the operation of each device in the fiber optic sensing system, and complete the parameter measurement of the single-mode optical fiber to be measured.

[0058] The fiber optic sensing system can be as Figure 1 shown, including a single-mode optical fiber 15 to be measured and multiple devices, such as a fiber coupler 2, a first electro-optic modulator 3, a second electro-optic modulator 4, and other devices.

[0059] The data storage system can store the data that the control device needs to process, such as the obtained forward Brillouin scattering signal and backward Brillouin scattering signal, etc. The data storage system can be integrated on the control device, or placed in the cloud or other network servers. The server can be implemented with an independent server or a server cluster composed of multiple servers.

[0060] In an exemplary embodiment, as Figure 2 shown, a fiber parameter measurement method based on Brillouin scattering is provided, including the following steps 201 to step 203. Among them:

[0061] S201, modulate the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light.

[0062] Among them, the laser is a device capable of emitting laser light. The electro-optic modulator is a modulator made using the electro-optic effect of certain electro-optic crystals, and can be used for modulating the phase, amplitude, intensity, and polarization state of an optical signal. The pump light is the light that raises the laser light it emits to a high energy level. The probe light is the light used to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured.

[0063] Optionally, in the case where it is necessary to measure the parameters of the single-mode optical fiber to be measured, the laser can be controlled to emit laser light to the electro-optic modulator, and then the electro-optic modulator can be controlled to receive the laser light emitted by the laser and modulate the laser light emitted by the laser to obtain a high-energy pump light and a probe light for measuring parameters.

[0064] S202, control the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured, respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal.

[0065] Among them, the single-mode optical fiber to be measured is the single-mode optical fiber with parametric measurement requirements. The forward Brillouin scattering signal is the optical signal generated by Brillouin forward scattering, and the backward Brillouin scattering signal is the optical signal generated by Brillouin backward scattering.

[0066] Optionally, after obtaining the pump light and the probe light, the pump light and the probe light can be respectively input into the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured; further, the pump light enters the single-mode optical fiber to be measured and acts in the single-mode optical fiber to be measured, generating a forward Brillouin scattering signal; the probe light enters the single-mode optical fiber to be measured and acts with the pump light in the single-mode optical fiber to be measured, generating a backward Brillouin scattering signal.

[0067] S203. Measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0068] Optionally, after obtaining the forward Brillouin scattering signal and the backward Brillouin scattering signal, the forward Brillouin scattering signal and the backward Brillouin scattering signal can be subjected to photoelectric conversion to obtain the electrical signals corresponding to the forward Brillouin scattering signal and the backward Brillouin scattering signal, and then the obtained electrical signals are input into a pre-trained parametric measurement model. Through the parametric measurement model, the electrical signals are analyzed, and then the temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured.

[0069] The above-mentioned fiber parameter measurement method based on Brillouin scattering controls the pump light and the probe light obtained by modulating the laser emitted by the laser by the electro-optic modulator to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured, and obtains the forward Brillouin scattering signal and the backward Brillouin scattering signal; and then measures the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal. Compared with the prior art in which only the distributed optical fiber sensing technology based on backward Brillouin scattering is used to measure the temperature parameter or strain parameter of the optical fiber to be measured respectively, the above-mentioned scheme can accurately and efficiently obtain the forward Brillouin scattering signal and the backward Brillouin scattering signal by controlling the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured, and then achieve the effect of efficiently and accurately measuring the temperature parameter and strain parameter of the single-mode optical fiber to be measured simultaneously.

[0070] In order to obtain the pump light and the probe light more efficiently, on the basis of the above-mentioned embodiment, in an exemplary embodiment, as Figure 3 shown, the above-mentioned S201 may include steps 301 to 303. Among them:

[0071] S301. Divide the laser emitted by the laser into a first laser and a second laser through an optical fiber coupler.

[0072] Among them, the powers of the first laser and the second laser are the same. The fiber coupler is a component used to achieve optical signal splitting / combining.

[0073] Optionally, as described above Figure 1 As shown, after the laser 1 emits laser light, the fiber coupler 2 can receive and split the laser light emitted by the laser 1, so as to split the laser light emitted by the laser 1 into two laser beams with the same power; among them, one laser beam can be used as the first laser, and the other laser beam can be used as the second laser.

[0074] S302, drive the first electro-optic modulator to modulate the first laser with the first path of pulse signal output by the sine segment module, and obtain pump light containing two frequency components.

[0075] Among them, the sine segment module is a module that can output a sine pulse signal. The first path of pulse signal is the first path of sine pulse segment used to drive the first electro-optic modulator. For example, it can be a sine pulse segment with a duration of 1 μs. The first electro-optic modulator is an electro-optic modulator used to modulate the pump light. The two frequency components are two sine waves with different frequencies included in the pump light.

[0076] Optionally, as described above Figure 1 As shown, after obtaining the first laser, the sine segment module 8 can be controlled to output the first path of pulse signal to the first photoelectric modulator 3; further, the first path of pulse signal output by the sine segment module 8 drives the first electro-optic modulator 3 to modulate the first laser, and then pump light containing two frequency components is obtained.

[0077] S303, drive the second electro-optic modulator to modulate the second laser with the microwave signal output by the microwave source module, and obtain the probe light.

[0078] Among them, the microwave source module is a module that can output a microwave signal. The second electro-optic modulator is an electro-optic modulator used to modulate the probe light.

[0079] Optionally, as described above Figure 1 As shown, after obtaining the second laser, the microwave source module 9 can be controlled to output a microwave signal to the second photoelectric modulator 4, for example, it can be a microwave pulse signal with a duty cycle of 0.5; further, the microwave signal output by the microwave source module 9 drives the second electro-optic modulator 4 to modulate the second laser, and then the probe light is obtained.

[0080] It can be understood that through an optical fiber coupler, the laser emitted by the laser can be accurately divided into first laser and second laser with the same power; and then the first electro-optic modulator is driven by the first path of pulse signal output by the sine segment module, and the second electro-optic modulator is driven by the microwave signal output by the microwave source module, so as to realize efficient and accurate modulation of the first laser and the second laser, and further obtain a more accurate pumping light and detection light effect.

[0081] In order to obtain more accurate forward Brillouin scattering signals and backward Brillouin scattering signals, in an exemplary embodiment, as Figure 4 shown, the above S102 may include steps 401 to 402, where:

[0082] S401, amplify the pumping light through an erbium-doped fiber amplifier, and input the amplified pumping light from the first end of the single-mode fiber under test into the single-mode fiber under test to obtain a forward Brillouin scattering signal.

[0083] Among them, the erbium-doped fiber amplifier is a device for amplifying light.

[0084] Optionally, after obtaining the pumping light, as Figure 1 shown, the pumping light can be input into the erbium-doped fiber amplifier 5 to control the erbium-doped fiber amplifier to amplify the pumping light; further, the pumping light amplified by the erbium-doped fiber amplifier is input from the first end of the single-mode fiber under test 15 into the single-mode fiber under test, and the two frequency components of the pumping light act in the single-mode fiber under test 15 to generate a forward Brillouin scattering signal.

[0085] S402, perform polarization scrambling on the detection light through an orthogonal polarization scrambler, and input the polarized detection light from the second end of the single-mode fiber under test into the single-mode fiber under test to obtain a backward Brillouin scattering signal.

[0086] Among them, the orthogonal polarization scrambler is a device suitable for increasing orthogonal polarization mode coupling.

[0087] Optionally, after obtaining the detection light, as Figure 1 shown, due to the polarization fading phenomenon of the single-mode fiber under test, in order to ensure that the signals of the single-mode fiber under test all have a high signal-to-noise ratio, the detection light can be input into the orthogonal polarization scrambler 6 to control the orthogonal polarization scrambler 6 to perform polarization scrambling on the detection light; further, the detection light polarized by the orthogonal polarization scrambler 6 is input from the second end of the single-mode fiber under test 15 into the single-mode fiber under test 15, and the detection light and the two frequency components of the pumping light act in the single-mode fiber under test 15 to generate a backward Brillouin scattering signal.

[0088] It can be understood that by introducing an erbium-doped fiber amplifier to amplify the pump light and introducing an orthogonal polarization scrambler to scramble the probe light, and then inputting the amplified pump light and the scrambled probe light into the single-mode fiber under test from both ends of the single-mode fiber under test respectively, and making them act in the single-mode fiber under test, the effect of making the obtained forward Brillouin scattering signal and backward Brillouin scattering signal more accurate can be achieved.

[0089] In order to more accurately measure the parameters of the single-mode fiber under test, in an exemplary embodiment, as Figure 5 shown, the above S203 may include steps 501 to 503. Among them:

[0090] S501, drive the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal through the second path of pulse signal output by the sine segment module.

[0091] Among them, the sine segment module is the sine segment module that outputs the first path of pulse signal; in this embodiment, the sine segment module can output a second path of pulse signal that is strictly synchronized with the output time of the first path of pulse signal, and the second path of pulse signal is the sine pulse segment that drives the acquisition card to acquire the electrical signal. The acquisition card is a device that can acquire electrical signals.

[0092] Optionally, after obtaining the forward Brillouin scattering signal and the backward Brillouin scattering signal, as Figure 1 shown, the forward Brillouin scattering signal and the backward Brillouin scattering signal can be subjected to photoelectric conversion to obtain the electrical signals corresponding to the forward Brillouin scattering signal and the backward Brillouin scattering signal; further, the sine segment module 8 can be controlled to output a second path of pulse signal that is strictly synchronized with the output time of the first path of pulse signal, so as to drive the acquisition card 14 to acquire the electrical signals obtained by photoelectric conversion of the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0093] In order to make the acquired electrical signals more accurate, an implementable way is to filter the forward Brillouin scattering signal and the backward Brillouin scattering signal through a fiber Bragg grating filter to obtain a lower sideband signal; convert the lower sideband signal into an electrical signal through a photodetector; drive the acquisition card to acquire the electrical signal through the second path of pulse signal output by the sine segment module.

[0094] Among them, the fiber Bragg grating filter is a device that filters optical signals. The lower sideband signal is the single sideband signal obtained through filtering processing. The photodetector is a device used to convert optical signals into electrical signals.

[0095] Optionally, after obtaining the forward Brillouin scattering signal and the backward Brillouin scattering signal, asFigure 1 As shown, the forward Brillouin scattering signal and the backward Brillouin scattering signal can be input into the fiber Bragg grating filter 12 through the first circulator 10 and the second circulator 11. The fiber Bragg grating filter 12 filters the forward Brillouin scattering signal and the backward Brillouin scattering signal to obtain a lower sideband signal. The lower sideband signal is input into the photodetector 13, and through the photodetector 13, the lower sideband signal is converted into an electrical signal. Further, the sine segment module 8 can be controlled to output a second pulse signal to drive the acquisition card to acquire the converted electrical signal.

[0096] It should be noted that by introducing a fiber Bragg grating filter, which filters the forward Brillouin scattering signal and the backward Brillouin scattering signal, a more accurate lower sideband signal can be obtained. Further, by converting the lower sideband signal through a photodetector, the obtained electrical signal can be made more accurate, thereby achieving the effect of improving the accuracy of the electrical signal acquired by the acquisition card.

[0097] S502. According to the acquired electrical signal, construct a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal.

[0098] Among them, the Brillouin gain spectrum is a mathematical model used to describe the gain process of laser through Brillouin scattering, such as a function relationship model presenting a bell-shaped curve, etc.

[0099] Optionally, after the electrical signal is acquired, the acquired electrical signal can be input into a pre-constructed gain spectrum construction model. Through the Brillouin construction model, according to the acquired electrical signal, a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal are constructed.

[0100] S503. According to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured.

[0101] Optionally, after the forward Brillouin gain spectrum and the backward Brillouin gain spectrum are constructed, the forward Brillouin gain spectrum and the backward Brillouin gain spectrum can be input into a pre-constructed parameter measurement model. Furthermore, through the parameter measurement model, the forward Brillouin gain spectrum and the backward Brillouin gain spectrum are calculated to realize the measurement of the single-mode optical fiber to be measured.

[0102] It can be understood that the electrical signals converted from the collected forward Brillouin scattering signal and backward Brillouin scattering signal can be used to more accurately construct the forward Brillouin gain spectrum and backward Brillouin gain spectrum; further, based on the forward Brillouin gain spectrum and backward Brillouin gain spectrum, it is possible to achieve a more accurate effect of simultaneously measuring the temperature parameter and strain parameter of the single-mode optical fiber to be measured.

[0103] Further, another implementable way to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured is that after constructing the forward Brillouin gain spectrum and backward Brillouin gain spectrum, data fitting can be performed on the forward Brillouin gain spectrum and backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; based on the two-parameter matrix equation, the forward Brillouin frequency shift and the backward Brillouin frequency shift, the temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured.

[0104] Among them, the Brillouin frequency shift is the change in the optical wave frequency caused by the strain of the single-mode optical fiber to be measured when the pump light and the probe light propagate in the single-mode optical fiber to be measured.

[0105] Optionally, after constructing the forward Brillouin gain spectrum and backward Brillouin gain spectrum, the forward Brillouin gain spectrum and backward Brillouin gain spectrum can be input into a pre-set calculation model, and through the pre-set calculation model, data fitting is performed on the forward Brillouin gain spectrum and backward Brillouin gain spectrum, and then the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum are obtained; further, based on the two-parameter matrix equation, combined with the obtained forward Brillouin frequency shift and backward Brillouin frequency shift, the temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured.

[0106] Specifically, let the temperature sensitivity of the forward Brillouin scattering be The strain sensitivity is The temperature sensitivity of the backward Brillouin scattering is The strain sensitivity is The temperature change is ΔT, and the strain change is Δε, then the forward Brillouin frequency shift Δf can be determined FSBS As shown in the following formula (1), the backward Brillouin frequency shift Δf BSBS As shown in the following formula (2).

[0107]

[0108]

[0109] Further, the temperature parameter and strain parameter of the single-mode optical fiber to be measured can be determined by the following formula (3).

[0110]

[0111] It should be noted that by introducing a two-parameter matrix equation and combining the forward Brillouin frequency shift and the backward Brillouin frequency shift determined by fitting data from the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, it is possible to achieve a more efficient and accurate simultaneous measurement of the temperature parameter and the strain parameter of the single-mode optical fiber to be measured.

[0112] In one embodiment, as Figure 6 shown, a preferred example of an optical fiber parameter measurement method based on Brillouin scattering is provided. The specific process is as follows:

[0113] S601, through an optical fiber coupler, divide the laser light emitted by the laser into first laser light and second laser light.

[0114] Among them, the first laser light and the second laser light have the same power.

[0115] S602, drive the first electro-optic modulator to modulate the first laser light through the first path of pulse signal output by the sine segment module, and obtain pump light containing two frequency components.

[0116] S603, drive the second electro-optic modulator to modulate the second laser light through the microwave signal output by the microwave source module, and obtain probe light.

[0117] S604, through an erbium-doped fiber amplifier, amplify the pump light, and input the amplified pump light from the first end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured, and obtain a forward Brillouin scattering signal.

[0118] S605, through an orthogonal polarization scrambler, perform polarization scrambling on the probe light, and input the polarization-scrambled probe light from the second end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured, and obtain a backward Brillouin scattering signal.

[0119] S606, through an optical fiber grating filter, filter the forward Brillouin scattering signal and the backward Brillouin scattering signal to obtain a lower sideband signal.

[0120] S607, through a photodetector, convert the lower sideband signal into an electrical signal.

[0121] S608, drive the acquisition card to acquire the electrical signal through the second path of pulse signal output by the sine segment module.

[0122] S609, according to the acquired electrical signal, construct a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal.

[0123] S610, perform data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum.

[0124] S611, measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the two-parameter matrix equation, the forward Brillouin frequency shift, and the backward Brillouin frequency shift.

[0125] For the specific processes of the above S601 - S611, reference can be made to the descriptions of the method embodiments above. Their implementation principles and technical effects are similar, and will not be elaborated here.

[0126] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indications of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, the execution of these steps has no strict order limitation, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0127] Based on the same inventive concept, the embodiments of the present application also provide a Brillouin scattering-based optical fiber parameter measurement device for implementing the above-mentioned Brillouin scattering-based optical fiber parameter measurement method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more of the following embodiments of the Brillouin scattering-based optical fiber parameter measurement device can refer to the limitations on the Brillouin scattering-based optical fiber parameter measurement method in the above text, and will not be elaborated here.

[0128] In an exemplary embodiment, as Figure 7 shown, a Brillouin scattering-based optical fiber parameter measurement device 1 is provided, including: a laser modulation module 10, a signal acquisition module 20, and a parameter measurement module 30, where:

[0129] The laser modulation module 10 is used to modulate the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light.

[0130] The signal acquisition module 20 is used to control the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured, respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal.

[0131] The parameter measurement module 30 is configured to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0132] In an exemplary embodiment, based on the above Figure 7 , as Figure 8 shown, the above laser modulation module 10 may include:

[0133] A laser distribution unit 11, configured to divide the laser emitted by the laser into a first laser and a second laser through an optical fiber coupler.

[0134] A first acquisition unit 12, configured to drive a first electro-optic modulator to modulate the first laser through a first path of pulse signal output by the sine segment module, so as to obtain a pump light containing two frequency components.

[0135] A second acquisition unit 13, configured to drive a second electro-optic modulator to modulate the second laser through a microwave signal output by the microwave source module, so as to obtain a probe light.

[0136] In an exemplary embodiment, based on the above Figure 7 or Figure 8 , as Figure 9 shown, the above parameter measurement module 20 may include:

[0137] A third acquisition unit 21, configured to amplify the pump light through an erbium-doped fiber amplifier, and input the amplified pump light from the first end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured, so as to obtain a forward Brillouin scattering signal.

[0138] A fourth acquisition unit 22, configured to scramble the probe light through an orthogonal polarization scrambler, and input the scrambled probe light from the second end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured, so as to obtain a backward Brillouin scattering signal.

[0139] In an exemplary embodiment, based on the above Figure 7 , Figure 8 or Figure 9 , as Figure 10 shown, the above parameter measurement module 30 may include:

[0140] A signal acquisition unit 31, configured to drive an acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal through a second path of pulse signal output by the sine segment module.

[0141] A gain spectrum construction unit 32, configured to construct a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal according to the acquired electrical signals.

[0142] A parameter measurement unit 33 is configured to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum.

[0143] In an exemplary embodiment, the signal acquisition unit 31 may specifically be configured to:

[0144] Filter the forward Brillouin scattering signal and the backward Brillouin scattering signal through an optical fiber grating filter to obtain a lower sideband signal; convert the lower sideband signal into an electrical signal through a photodetector; and drive an acquisition card to acquire the electrical signal through a second path of pulse signal output by a sine segment module.

[0145] In an exemplary embodiment, the parameter measurement unit 33 may specifically be configured to:

[0146] Perform data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; and measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the two-parameter matrix equation, the forward Brillouin frequency shift, and the backward Brillouin frequency shift.

[0147] Each module in the above optical fiber parameter measurement device based on Brillouin scattering may be implemented in whole or in part by software, hardware, and their combination. Each of the above modules may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0148] In an exemplary embodiment, the method may be applied to a control device, and the control device may be a server, and its internal structure diagram may be as Figure 11As shown in the figure. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as the obtained forward Brillouin scattering signal and backward Brillouin scattering signal. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a fiber optic parameter measurement method based on Brillouin scattering.

[0149] Those skilled in the art can understand that Figure 11 the structure shown in the figure is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0150] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the following steps are implemented:

[0151] Modulate the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light;

[0152] Control the pump light and the probe light to enter the single-mode fiber under test from both ends of the single-mode fiber under test respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0153] Measure the temperature parameter and strain parameter of the single-mode fiber under test according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0154] In one embodiment, when the processor executes the logic of modulating the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light in the computer program, the following steps are also implemented:

[0155] The laser light emitted by a laser is divided into a first laser light and a second laser light through an optical fiber coupler; wherein, the powers of the first laser light and the second laser light are the same; the first path of pulse signal output by a sine segment module drives a first electro-optic modulator to modulate the first laser light to obtain a pump light containing two frequency components; the microwave signal output by a microwave source module drives a second electro-optic modulator to modulate the second laser light to obtain a probe light.

[0156] In one embodiment, the two ends of the single-mode optical fiber to be measured include a first end and a second end. When the processor executes a computer program to control the pump light and the probe light to enter the single-mode optical fiber to be measured from the two ends of the single-mode optical fiber to be measured respectively to obtain the logic of the forward Brillouin scattering signal and the backward Brillouin scattering signal, the following steps are further implemented:

[0157] The pump light is amplified through an erbium-doped fiber amplifier, and the amplified pump light is input into the single-mode optical fiber to be measured from the first end of the single-mode optical fiber to be measured to obtain a forward Brillouin scattering signal; the probe light is depolarized through an orthogonal depolarizer, and the depolarized probe light is input into the single-mode optical fiber to be measured from the second end of the single-mode optical fiber to be measured to obtain a backward Brillouin scattering signal.

[0158] In one embodiment, when the processor executes a computer program to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal, the following steps are further implemented:

[0159] The second path of pulse signal output by the sine segment module drives an acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal; according to the acquired electrical signals, a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal are constructed; according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, the temperature parameter and strain parameter of the single-mode optical fiber to be measured are measured.

[0160] In one embodiment, when the processor executes a computer program to drive an acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal through the second path of pulse signal output by the sine segment module, the following steps are further implemented:

[0161] The forward Brillouin scattering signal and the backward Brillouin scattering signal are filtered through an optical fiber grating filter to obtain a lower sideband signal; the lower sideband signal is converted into an electrical signal through a photodetector; the second path of pulse signal output by the sine segment module drives an acquisition card to acquire the electrical signal.

[0162] In one embodiment, when the processor executes the computer program to measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, the following steps are further implemented:

[0163] Perform data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the two-parameter matrix equation, the forward Brillouin frequency shift, and the backward Brillouin frequency shift.

[0164] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0165] Modulate the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light;

[0166] Control the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0167] Measure the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal.

[0168] In one embodiment, when the logic that the computer program modulates the laser emitted by the laser through an electro-optic modulator to obtain a pump light and a probe light is executed by the processor, the following steps are further implemented:

[0169] Divide the laser emitted by the laser into a first laser and a second laser through an optical fiber coupler; wherein, the powers of the first laser and the second laser are the same; drive the first electro-optic modulator to modulate the first laser through the first path of pulse signal output by the sine segment module to obtain a pump light containing two frequency components; drive the second electro-optic modulator to modulate the second laser through the microwave signal output by the microwave source module to obtain a probe light.

[0170] In one embodiment, both ends of the single-mode optical fiber to be measured include a first end and a second end. When the logic that the computer program controls the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal is executed by the processor, the following steps are further implemented:

[0171] An erbium-doped fiber amplifier is used to amplify the pump light, and the amplified pump light is input from the first end of the single-mode fiber under test into the single-mode fiber under test to obtain a forward Brillouin scattering signal; an orthogonal polarization scrambler is used to scramble the probe light, and the scrambled probe light is input from the second end of the single-mode fiber under test into the single-mode fiber under test to obtain a backward Brillouin scattering signal.

[0172] In one embodiment, when the logic for the computer program to measure the temperature parameter and strain parameter of the single-mode fiber under test according to the forward Brillouin scattering signal and the backward Brillouin scattering signal is executed by the processor, the following steps are further implemented:

[0173] The second pulse signal output by the sine segment module is used to drive the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal; according to the acquired electrical signals, a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal are constructed; according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, the temperature parameter and strain parameter of the single-mode fiber under test are measured.

[0174] In one embodiment, when the logic for the computer program to drive the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal through the second pulse signal output by the sine segment module is executed by the processor, the following steps are further implemented:

[0175] The forward Brillouin scattering signal and the backward Brillouin scattering signal are filtered through a fiber Bragg grating filter to obtain a lower sideband signal; the lower sideband signal is converted into an electrical signal through a photodetector; the second pulse signal output by the sine segment module is used to drive the acquisition card to acquire the electrical signal.

[0176] In one embodiment, when the logic for the computer program to measure the temperature parameter and strain parameter of the single-mode fiber under test according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum is executed by the processor, the following steps are further implemented:

[0177] Data fitting is performed on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; according to the two-parameter matrix equation, the forward Brillouin frequency shift and the backward Brillouin frequency shift, the temperature parameter and strain parameter of the single-mode fiber under test are measured.

[0178] In one embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0179] The laser emitted by the laser is modulated by an electro-optic modulator to obtain pump light and probe light;

[0180] The pump light and the probe light are controlled to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, so as to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal;

[0181] According to the forward Brillouin scattering signal and the backward Brillouin scattering signal, the temperature parameter and the strain parameter of the single-mode optical fiber to be measured are measured.

[0182] In one embodiment, when the logic that the computer program modulates the laser emitted by the laser through the electro-optic modulator to obtain the pump light and the probe light is executed by the processor, the following steps are further implemented:

[0183] The laser emitted by the laser is divided into a first laser and a second laser through an optical fiber coupler; wherein, the powers of the first laser and the second laser are the same; the first laser is modulated by driving the first electro-optic modulator through the first path of pulse signal output by the sine segment module to obtain pump light containing two frequency components; the second laser is modulated by driving the second electro-optic modulator through the microwave signal output by the microwave source module to obtain probe light.

[0184] In one embodiment, both ends of the single-mode optical fiber to be measured include a first end and a second end. When the logic that the computer program controls the pump light and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively to obtain the forward Brillouin scattering signal and the backward Brillouin scattering signal is executed by the processor, the following steps are further implemented:

[0185] The pump light is amplified through an erbium-doped fiber amplifier, and the amplified pump light is input into the single-mode optical fiber to be measured from the first end of the single-mode optical fiber to be measured to obtain a forward Brillouin scattering signal; the probe light is depolarized through an orthogonal depolarizer, and the depolarized probe light is input into the single-mode optical fiber to be measured from the second end of the single-mode optical fiber to be measured to obtain a backward Brillouin scattering signal.

[0186] In one embodiment, when the logic that the computer program measures the temperature parameter and the strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin scattering signal and the backward Brillouin scattering signal is executed by the processor, the following steps are further implemented:

[0187] The second path of pulse signal output by the sine segment module is used to drive the acquisition card to acquire the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal; according to the acquired electrical signals, a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal are constructed; according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum, the temperature parameter and the strain parameter of the single-mode optical fiber to be measured are measured.

[0188] In one embodiment, when the logic that the computer program drives the acquisition card to collect the electrical signals converted from the forward Brillouin scattering signal and the backward Brillouin scattering signal through the second pulse signal output by the sine segment module is executed by the processor, the following steps are further implemented:

[0189] Filter the forward Brillouin scattering signal and the backward Brillouin scattering signal through an optical fiber grating filter to obtain a lower sideband signal; convert the lower sideband signal into an electrical signal through a photodetector; drive the acquisition card to collect the electrical signal through the second pulse signal output by the sine segment module.

[0190] In one embodiment, when the logic that the computer program measures the temperature parameter and the strain parameter of the single-mode optical fiber to be measured according to the forward Brillouin gain spectrum and the backward Brillouin gain spectrum is executed by the processor, the following steps are further implemented:

[0191] Perform data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain the forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and the backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; measure the temperature parameter and the strain parameter of the single-mode optical fiber to be measured according to the two-parameter matrix equation, the forward Brillouin frequency shift, and the backward Brillouin frequency shift.

[0192] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include Read-Only Memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0193] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0194] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method for measuring fiber parameters based on Brillouin scattering, characterized in that, The method includes: Dividing the laser light emitted by a laser into a first laser light and a second laser light through an optical fiber coupler; wherein, the powers of the first laser light and the second laser light are the same; Driving a first electro-optic modulator to modulate the first laser light through a first path of pulse signal output by a sine segment module to obtain a pump light containing two frequency components; Driving a second electro-optic modulator to modulate the second laser light through a microwave signal output by a microwave source module to obtain a probe light; Controlling the pump light containing two frequency components and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal; wherein, the forward Brillouin scattering signal is generated by the two frequency components of the pump light acting in the single-mode optical fiber to be measured, and the backward Brillouin scattering signal is generated by the probe light and the two frequency components of the pump light acting in the single-mode optical fiber to be measured; Driving an acquisition card to collect the electrical signals obtained by converting the forward Brillouin scattering signal and the backward Brillouin scattering signal through a second path of pulse signal output by the sine segment module; Constructing a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal according to the collected electrical signals; Performing data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain a forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and a backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; Measuring the temperature parameter and strain parameter of the single-mode optical fiber to be measured according to a two-parameter matrix equation, the forward Brillouin frequency shift and the backward Brillouin frequency shift.

2. The method according to claim 1, characterized in that, Both ends of the single-mode optical fiber to be measured include a first end and a second end. The controlling the pump light containing two frequency components and the probe light to enter the single-mode optical fiber to be measured from both ends of the single-mode optical fiber to be measured respectively, to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal, includes: Amplifying the pump light through an erbium-doped fiber amplifier, and inputting the amplified pump light from the first end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured to obtain a forward Brillouin scattering signal; Performing polarization scrambling on the probe light through an orthogonal polarization scrambler, and inputting the polarization-scrambled probe light from the second end of the single-mode optical fiber to be measured into the single-mode optical fiber to be measured to obtain a backward Brillouin scattering signal.

3. The method according to claim 1, characterized in that, The driving an acquisition card to collect the electrical signals obtained by converting the forward Brillouin scattering signal and the backward Brillouin scattering signal through a second path of pulse signal output by the sine segment module, includes: Filtering the forward Brillouin scattering signal and the backward Brillouin scattering signal through an optical fiber grating filter to obtain a lower sideband signal; Converting the lower sideband signal into an electrical signal through a photodetector; Driving an acquisition card to collect the electrical signal through a second path of pulse signal output by the sine segment module.

4. A device for measuring fiber parameters based on Brillouin scattering, characterized in that, The device includes: A laser distribution unit for splitting the laser emitted by a laser into a first laser and a second laser through an optical fiber coupler; wherein the powers of the first laser and the second laser are the same; A first acquisition unit for driving a first electro-optic modulator to modulate the first laser through a first path of pulse signal output by a sine segment module to obtain a pump light containing two frequency components; A second acquisition unit for driving a second electro-optic modulator to modulate the second laser through a microwave signal output by a microwave source module to obtain a probe light; A signal acquisition module for controlling the pump light containing two frequency components and the probe light to enter the single-mode optical fiber under test from both ends of the single-mode optical fiber under test respectively to obtain a forward Brillouin scattering signal and a backward Brillouin scattering signal; wherein the forward Brillouin scattering signal is generated by the interaction of the two frequency components of the pump light in the single-mode optical fiber under test, and the backward Brillouin scattering signal is generated by the interaction of the probe light and the two frequency components of the pump light in the single-mode optical fiber under test; A signal collection module for driving a collection card to collect the electrical signals obtained by converting the forward Brillouin scattering signal and the backward Brillouin scattering signal through a second path of pulse signal output by the sine segment module; A gain determination module for constructing a forward Brillouin gain spectrum corresponding to the forward Brillouin scattering signal and a backward Brillouin gain spectrum corresponding to the backward Brillouin scattering signal according to the collected electrical signals; A frequency shift determination module for performing data fitting on the forward Brillouin gain spectrum and the backward Brillouin gain spectrum to obtain a forward Brillouin frequency shift corresponding to the forward Brillouin gain spectrum and a backward Brillouin frequency shift corresponding to the backward Brillouin gain spectrum; A parameter measurement module for measuring the temperature parameter and the strain parameter of the single-mode optical fiber under test according to a two-parameter matrix equation, the forward Brillouin frequency shift and the backward Brillouin frequency shift; 5. A computer device, including a memory and a processor, the memory stores a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

7. A computer program product, including a computer program, characterized in that, When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 3 are implemented.

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