Method and apparatus for detecting ground surface position of optical fiber splicing point, device, and storage medium

Abstract

The present description relates to the technical field of optical fiber communication, and provides a method and apparatus for detecting the ground surface position of an optical fiber splicing point, a device, and a storage medium. The apparatus comprises a light source and a light receiving processor. The light source provides continuous laser and pulse laser converted from the continuous laser, and inputs the pulse laser into an optical fiber to be detected. The light receiving processor extracts backward Rayleigh light and backward dual-channel Raman light from backward scattered light in said optical fiber; on the basis that electric signal intensity of the backward dual-channel Raman light and backward coherent Rayleigh light formed by coherence of the backward Rayleigh light and the continuous laser is distributed along the distance, determines a target position where an optical fiber splicing point on said optical fiber is located; on the basis of a vibration signal in the backward coherent Rayleigh light obtained under excitation of specific vibration along a ground surface position of said optical fiber, determines a relative position of a ground surface excitation position on said optical fiber; and when the relative position is consistent with the target position, uses the ground surface excitation position as the ground surface position of the optical fiber splicing point.

Description

Method, device, equipment and storage medium for detecting surface position of optical fiber splicing point

[0001] This application claims priority to Chinese patent application No. 202311215996.3 filed on September 20, 2023, entitled “Method, device, equipment and storage medium for detecting the surface position of optical fiber splicing points,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the field of optical fiber communication technology, and in particular to a method, device, equipment and storage medium for detecting the surface position of an optical fiber connection point. Background Art

[0003] Fiber-optic communication technology has become the mainstream communications technology due to its high speed, high security and reliability, and low cost. With the rapid development of fiber-optic communication technology, the mileage of optical cable lines is increasing, and maintenance requirements for optical cable lines are becoming more stringent. For example, not only must attenuation points that affect communication quality be promptly repaired, but geographic location information of fiber splice closures is also required. A digital twin of the optical cable is formed by combining fiber routing information, fiber fault location information, and fiber splice point information. A fiber splice point refers to the connection point where two optical fibers are connected and the optical power is coupled.

[0004] After the optical cable is buried underground, the fiber splice locations usually have no obvious features, and the attenuation of a good splice that meets the standards is very small, making it difficult to determine the location of the fiber splice using an optical time-domain reflectometer (OTDR) or other detection tools.

[0005] Summary of the Invention

[0006] The purpose of the embodiments of this specification is to provide a method, device, equipment and storage medium for detecting the surface position of an optical fiber splicing point, so as to realize the detection of the surface position of an optical fiber splicing point.

[0007] To achieve the above objectives, on the one hand, an embodiment of this specification provides a device for detecting the surface position of an optical fiber splicing point, comprising:

[0008] A light source, configured to provide a continuous laser with a line width smaller than a preset value and a pulsed laser converted from the continuous laser, and input the pulsed laser into the optical fiber to be detected;

[0009] An optical receiving processor is configured to receive backscattered light within the optical fiber to be detected; decompose the backscattered light into backStokes Raman light, backAnti-Stokes Raman light, and backRayleigh light according to wavelength; determine the distribution of electrical signal intensities along distance of the backStokes Raman light, the backAnti-Stokes Raman light, and backCoherent Rayleigh light formed by the coherence of the backRayleigh light and the continuous laser light; determine a target position of a fiber splicing point on the optical fiber to be detected based on the distribution of electrical signal intensities along distance; determine a relative position of a surface excitation position on the optical fiber to be detected based on a vibration signal in the backCoherent Rayleigh light obtained by exciting a specific vibration along a surface position of the optical fiber to be detected; and when the relative position is consistent with the target position, use the surface excitation position as the surface position of the optical fiber splicing point.

[0010] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the optical receiving processor is further configured to:

[0011] When the relative position is inconsistent with the target position, re-detection is performed according to specific vibration excited at the next surface position along the optical fiber to be detected.

[0012] In the optical fiber splicing point surface position detection device of the embodiment of this specification, determining the target position of the optical fiber splicing point on the optical fiber to be detected according to the distribution of the electrical signal strength along the distance includes:

[0013] The positions of all singular values ​​of the electric signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as a first position point set; the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution are taken as a second position point set; the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution are taken as a third position point set;

[0014] Taking the union of the second position point set and the second position point set;

[0015] Calculating a difference between the union and the first set of position points;

[0016] Using the position point in the difference set as the target position of the optical fiber splicing point on the optical fiber to be detected;

[0017] Among them, in the union set and the difference set, position points whose position offset is less than a preset value are regarded as the same position point.

[0018] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the electrical signal strength distribution along the distance includes the electrical signal strength distribution along the distance corrected according to the following formula:

[0019] Among them, A ri is the position point corresponding to the i-th singular value of the backward coherent Rayleigh light, A si is the position point corresponding to the i-th singular value of the backward Stokes Raman light, A asi is the position corresponding to the i-th singular value of the backward anti-Stokes Raman light, A′ ri A′ is the position of the backward coherent Rayleigh light in the optical fiber to be detected after the i-th singular value correction, si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

[0020] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the initial surface excitation position corresponding to the excitation of the specific vibration is the estimated surface position corresponding to the target position.

[0021] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the light source includes:

[0022] A laser, used for generating a continuous laser with a line width smaller than a preset value;

[0023] An optical splitter is used to split the continuous laser light into a first continuous laser light and a second continuous laser light, provide the first continuous laser light to a pulse generator, and provide the second continuous laser light to the optical receiving processor;

[0024] A pulse generator, configured to convert the first continuous laser beam into a pulsed laser beam;

[0025] The optical fiber amplifier is used to amplify the pulse laser and input the amplified pulse laser into the optical fiber to be detected through an optical circulator.

[0026] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the optical receiving processor includes:

[0027] an optical filter, configured to receive the backscattered light in the optical fiber to be detected through the optical circulator, and decompose the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light, and backward Rayleigh light according to wavelength;

[0028] a first photodetector, configured to convert backward coherent Rayleigh light formed by the coherence of the first continuous laser beam and the backward Rayleigh light into a corresponding electrical signal;

[0029] a second photodetector, configured to convert the backward Stokes Raman light into a corresponding electrical signal;

[0030] a third photodetector, configured to convert the backward anti-Stokes Raman light into a corresponding electrical signal;

[0031] a data acquisition card, configured to synchronously acquire electrical signals output by the first photodetector, the second photodetector, and the third photodetector;

[0032] The processing module is configured to determine, based on the electrical signals collected by the data acquisition card, the distribution of the electrical signal intensities of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light along a distance; determine, based on the distribution of the electrical signal intensities along a distance, a target position of a fiber splicing point on the optical fiber to be detected; determine, based on a vibration signal in the backward coherent Rayleigh light obtained by exciting a specific vibration along a surface position of the optical fiber to be detected, a relative position of a surface excitation position on the optical fiber to be detected; and, when the relative position is consistent with the target position, use the surface excitation position as the surface position of the optical fiber splicing point.

[0033] In the optical fiber splicing point surface position detection device of the embodiment of this specification, the optical receiving processor further includes:

[0034] The synchronization control module is used to provide a synchronization signal to the pulse generator and the data acquisition card so that the pulse generator and the data acquisition card work synchronously.

[0035] On the other hand, an embodiment of this specification further provides a method for detecting the surface position of an optical fiber connection point, comprising:

[0036] Providing a continuous laser with a line width smaller than a preset value and a pulsed laser converted from the continuous laser, and inputting the pulsed laser into the optical fiber to be detected;

[0037] receiving backscattered light in the optical fiber to be detected;

[0038] Decomposing the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light and backward Rayleigh light according to wavelength;

[0039] Determining the distribution of electrical signal intensities of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light formed by the coherence of the backward Rayleigh light and the continuous laser light along the distance;

[0040] Determine the target position of the optical fiber connection point on the optical fiber to be detected according to the distribution of the electrical signal strength along the distance;

[0041] Determining the relative position of the surface excitation position on the optical fiber to be detected based on a vibration signal in the backward coherent Rayleigh light obtained when a specific vibration is excited at the surface position along the optical fiber to be detected;

[0042] When the relative position is consistent with the target position, the surface excitation position is used as the surface position of the optical fiber connection point.

[0043] The method for detecting the surface position of an optical fiber splicing point in the embodiment of this specification further includes:

[0044] When the relative position is inconsistent with the target position, re-detection is performed according to specific vibration excited at the next surface position along the optical fiber to be detected.

[0045] In the surface position detection method of an optical fiber splice point of an embodiment of this specification, determining the target position of the optical fiber splice point on the optical fiber to be detected based on the distribution of the electrical signal strength along the distance includes:

[0046] The positions of all singular values ​​of the electric signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as a first position point set; the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution are taken as a second position point set; the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution are taken as a third position point set;

[0047] Taking the union of the second position point set and the second position point set;

[0048] Calculating a difference between the union and the first set of position points;

[0049] Using the position point in the difference set as the target position of the optical fiber splicing point on the optical fiber to be detected;

[0050] Among them, in the union set and the difference set, position points whose position offset is less than a preset value are regarded as the same position point.

[0051] In the method for detecting the surface position of an optical fiber splicing point in the embodiment of this specification, the distribution of the electrical signal strength along the distance includes the distribution of the electrical signal strength along the distance corrected according to the following formula:

[0052] Among them, A ri is the position point corresponding to the i-th singular value of the backward coherent Rayleigh light, A si is the position point corresponding to the i-th singular value of the backward Stokes Raman light, A asiis the position corresponding to the i-th singular value of the backward anti-Stokes Raman light, A′ ri A′ is the position of the backward coherent Rayleigh light in the optical fiber to be detected after the i-th singular value correction, si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

[0053] In the method for detecting the surface position of an optical fiber splicing point according to the embodiment of the present specification, the initial surface excitation position corresponding to the excitation of the specific vibration is the estimated surface position corresponding to the target position.

[0054] On the other hand, an embodiment of this specification further provides a computer storage medium having a computer program stored thereon, wherein the computer program executes the instructions of the above method when executed by a processor of a computer device.

[0055] On the other hand, an embodiment of this specification further provides a computer program product, which includes a computer program. When the computer program is executed by a processor of a computer device, the computer program executes the instructions of the above method.

[0056] It can be seen from the technical solutions provided in the above embodiments of this specification that, in the embodiments of this specification, after the pulsed laser generated by the light source is input into the optical fiber to be detected, the optical receiving processor can extract the backward Rayleigh light and the backward dual-channel Raman light from the backscattered light in the optical fiber to be detected, and determine the target position of the optical fiber connection point on the optical fiber to be detected based on the electrical signal intensity distribution along the distance of the backward dual-channel Raman light and the backward coherent Rayleigh light formed by the backward Rayleigh light and the continuous laser coherence; on this basis, a specific vibration can be excited along a surface position of the optical fiber to be detected, and the relative position of the surface excitation position on the optical fiber to be detected can be determined based on the vibration signal in the backward coherent Rayleigh light obtained under the specific vibration; when the relative position is inconsistent with the target position, the specific vibration can be continued to be excited along the next surface position of the optical fiber to be detected to continue detection until the relative position is consistent with the target position, and the corresponding surface excitation position at this time is used as the surface position of the optical fiber connection point; thereby realizing the surface position detection of the optical fiber connection point. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0058] FIG1 shows a block diagram of a device for detecting the surface position of an optical fiber connection point in some embodiments of this specification;

[0059] FIG2 is a block diagram showing the structure of a light source in the optical fiber connection point surface position detection device shown in FIG1;

[0060] FIG3 is a block diagram showing the structure of the optical receiving processor in the optical fiber splicing point surface position detection device shown in FIG1 ;

[0061] FIG4 shows a schematic diagram of light speed correction in an exemplary embodiment of this specification;

[0062] FIG5 shows a schematic diagram of detecting the surface position of an optical fiber splicing point in an exemplary embodiment of this specification;

[0063] FIG6 shows a schematic diagram of singular point detection in an exemplary embodiment of this specification;

[0064] FIG7 shows a flow chart of a method for detecting the surface position of an optical fiber splicing point in some embodiments of this specification;

[0065] FIG8 shows a structural block diagram of a computer device in some embodiments of this specification.

[0066] [Description of Reference Numerals] 10. Light source; 101. Laser; 102. Optical splitter; 103. Pulse generator; 104. Fiber amplifier; 20. Light receiving processor; 201. Optical filter; 202a. First photodetector; 202b. Second photodetector; 202c. Third photodetector; 203. Data acquisition card; 204. Processing module; 30. Optical fiber to be tested; 40. Optical circulator; 50. Calibration test fiber; 60. Calibration test point; 70. Ground surface; 80. Ground excitation position; 90. Optical fiber splicing point; 802. Computer device; 804. Processor; 806. Memory; 808. Drive mechanism; 810. Input / output interface; 812. Input device; 814. Output device; 816. Presentation device; 818. Graphical user interface; 820. Network interface; 822. Communication link; 824. Communication bus. DETAILED DESCRIPTION

[0067] To help those skilled in the art better understand the technical solutions in this specification, the following will provide a clear and complete description of the technical solutions in the embodiments of this specification, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. All other embodiments derived by those skilled in the art based on the embodiments in this specification without creative effort shall fall within the scope of protection of this specification.

[0068] FIG1 shows a structural block diagram of a device for detecting the surface position of an optical fiber splicing point in some embodiments of the present specification; the device for detecting the surface position of an optical fiber splicing point may include a light source 10 and a light receiving processor 20 .

[0069] The light source 10 is used to provide continuous laser light with a line width smaller than a preset value and pulse laser light converted from the continuous laser light, and input the pulse laser light into the optical fiber 30 to be detected through an optical circulator 40 (or other optical devices with similar functions).

[0070] The optical receiving processor 20 is used to receive the backscattered light in the optical fiber 30 to be detected; decompose the backscattered light into backStokes Raman light, backAnti-Stokes Raman light and backRayleigh light according to wavelength; determine the electrical signal intensity distribution along the distance of the backStokes Raman light, the backAnti-Stokes Raman light, and the backCoherent Rayleigh light formed by the backRayleigh light and the continuous laser coherence; determine the target position of the optical fiber splicing point on the optical fiber 30 to be detected based on the electrical signal intensity distribution along the distance; determine the relative position of the surface excitation position on the optical fiber 30 to be detected based on the vibration signal in the backCoherent Rayleigh light obtained when a specific vibration is excited at a surface position along the optical fiber 30 to be detected; when the relative position is consistent with the target position, the surface excitation position is used as the surface position of the optical fiber splicing point; when the relative position is inconsistent with the target position, re-detection is performed based on the specific vibration excited at the next surface position along the optical fiber to be detected.

[0071] During the optical fiber drawing process, thermal disturbances cause atoms to experience uneven or fluctuating compressibility, resulting in uneven density and, consequently, uneven refractive index in the transmission medium. This unevenness or fluctuation is fixed during the cooling process, and the size of this uneven structure is much smaller than the wavelength of the incident light. The uneven refractive index of the transmission medium causes Rayleigh scattered light when light is transmitted through the optical fiber. Furthermore, optical fibers contain a variety of oxides, and uneven or fluctuating oxide concentrations can also cause uneven refractive index in the transmission medium, which in turn generates Rayleigh scattered light. Rayleigh scattered light has a power distribution throughout the entire medium space. Rayleigh scattered light traveling forward along the optical fiber axis is called forward Rayleigh light (or forward Rayleigh light), and Rayleigh scattered light traveling backward along the optical fiber axis is called backward Rayleigh light (or backward Rayleigh light). Rayleigh light is a frequency-invariant scattering (i.e., elastic scattering). If the generated scattering frequency is lower than the incident frequency, it is called Stokes scattering, and the corresponding scattered light is called Stokes light; otherwise, it is called anti-Stokes scattering, and the corresponding scattered light is called anti-Stokes light. Stokes scattering and anti-Stokes scattering are collectively referred to as Raman scattering.

[0072] Therefore, when a point on an optical fiber serves as a fiber splice, after a pulsed laser is input into the fiber, a portion (but not all) of the Stokes Raman light, anti-Stokes Raman light, and backward coherent Rayleigh light within the fiber will generate singular values ​​at the fiber splice. When the Stokes Raman light, anti-Stokes Raman light, and backward coherent Rayleigh light at a point on the optical fiber all generate singular values, it indicates that the optical fiber is broken or damaged at that point, rather than a fiber splice at that point. A singular value is a pulse-like jump in the electrical signal intensity of the scattered light along the distance distribution (sharply increasing and then sharply decreasing in a very short period of time); in other words, a singular value in the electrical signal intensity distribution of the scattered light along the distance distribution can also be considered a pulse signal.

[0073] Therefore, in the embodiment of the present specification, after the pulsed laser generated by the light source 10 is input into the optical fiber 30 to be detected, the optical receiving processor 20 can extract the backward Rayleigh light and the backward dual-channel Raman light from the backscattered light in the optical fiber 30 to be detected, and determine the target position of the optical fiber connection point on the optical fiber 30 to be detected based on the distribution of the electrical signal intensity of the backward dual-channel Raman light and the backward coherent Rayleigh light formed by the backward Rayleigh light and the continuous laser coherence along the distance; on this basis, a specific vibration can be excited along a surface position of the optical fiber 30 to be detected, and the relative position of the surface excitation position on the optical fiber 30 to be detected can be determined based on the vibration signal in the backward coherent Rayleigh light obtained under the specific vibration; when the relative position is inconsistent with the target position, the specific vibration can be continued to be excited along the next surface position of the optical fiber 30 to be detected to continue detection until the relative position is consistent with the target position, and the corresponding surface excitation position at this time is used as the surface position of the optical fiber connection point; thereby realizing the surface position detection of the optical fiber connection point.

[0074] As shown in FIG. 2 , in some embodiments of this specification, the light source 10 may include a laser 101 , a beam splitter 102 , and a pulse generator 103 .

[0075] The laser 101 may be a narrow linewidth laser, configured to generate a continuous laser with a linewidth less than a preset value. For example, in an exemplary embodiment of the present specification, the laser 101 may generate a continuous laser with a linewidth less than 100 KHz.

[0076] The optical splitter 102 is used to split the continuous laser light output by the laser 101 into a first continuous laser light channel and a second continuous laser light channel, providing the first continuous laser light channel to the pulse generator 103 and providing the second continuous laser light channel to the optical receiving processor 20. In some embodiments of the present specification, the power of the first continuous laser light channel split by the optical splitter 102 can be greater than the power of the second continuous laser light channel, so that the optical fiber 30 to be detected can effectively generate backward Rayleigh light, backward Stokes Raman light, and backward anti-Stokes Raman light. For example, in some embodiments of the present specification, the first continuous laser light channel can occupy 90% of the power of the continuous laser light channel, and the second continuous laser light channel can occupy 10% of the power of the continuous laser light channel.

[0077] Pulse generator 103 is used to convert the first continuous laser beam into pulsed laser beams. The continuous laser beam generated by laser 101 cannot be directly used for surface position detection of optical fiber splicing points and must be converted into discrete laser beams (e.g., pulsed laser beams). In an exemplary embodiment of this specification, pulse generator 103 may be an acousto-optic modulator (AOM), an electro-optic modulator (EOM), or a semiconductor laser amplifier (SOA).

[0078] As shown in FIG2 , in other embodiments of this specification, the light source 10 may further include a fiber amplifier 104, as needed. The fiber amplifier is used to amplify the pulsed laser light and input the amplified pulsed laser light into the optical fiber 30 to be detected via an optical circulator 40 (or other optical device with similar functions). In an exemplary embodiment of this specification, the fiber amplifier 104 may be, for example, an erbium-doped optical fiber amplifier (EDFA).

[0079] 3 , in some embodiments of this specification, the optical receiving processor 20 may include an optical filter 201 , a first photodetector 202 a , a second photodetector 202 b , a third photodetector 202 c , a data acquisition card 203 and a processing module 204 .

[0080] Optical filter 201 is configured to receive backscattered light from the optical fiber to be inspected via the optical circulator and decompose the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light, and backward Rayleigh light according to wavelength. Specifically, optical filter 201 can perform wavelength-based reception on the received backscattered light, decomposing the received backscattered light into three types of scattered light: backward Rayleigh light, backward Stokes Raman light, and backward anti-Stokes Raman light. For example, in an exemplary embodiment of this specification, if the wavelength of the continuous laser light is approximately 1550 nm, optical filter 201 can decompose Raman scattered light with a wavelength of approximately 1450 nm as backward Stokes Raman light, and can decompose Raman scattered light with a wavelength of approximately 1663 nm as backward anti-Stokes Raman light. In an exemplary embodiment of this specification, optical filter 201 can be, for example, a wavelength division multiplexer.

[0081] The first photodetector 202a is configured to convert the backward coherent Rayleigh light generated by the coherence of the second continuous laser beam and the backward Rayleigh light into a corresponding electrical signal. The second photodetector 202b is configured to convert the backward Stokes Raman light into a corresponding electrical signal. The third photodetector 202c is configured to convert the backward anti-Stokes Raman light into a corresponding electrical signal.

[0082] The data acquisition card 203 is used to synchronously acquire the electrical signals output by the first photodetector 202a, the second photodetector 202b, and the third photodetector 202c for processing by the processing module 204. Furthermore, to facilitate synchronous transmission and reception, the optical receiving processor 20 may also be configured with a synchronization control module for providing synchronization signals to the pulse generator and the data acquisition card 203, thereby enabling them to operate synchronously.

[0083] The processing module 204 is used to determine the distribution of the electrical signal intensities of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light along the distance based on the electrical signals collected by the data acquisition card; determine the target position of the optical fiber splicing point on the optical fiber to be detected based on the distribution of the electrical signal intensities along the distance; determine the relative position of the surface excitation position on the optical fiber to be detected based on the vibration signal in the backward coherent Rayleigh light obtained when a specific vibration is excited at a surface position along the optical fiber to be detected; when the relative position is consistent with the target position, use the surface excitation position as the surface position of the optical fiber splicing point; when the relative position is inconsistent with the target position, re-detect according to the specific vibration excited at the next surface position along the optical fiber to be detected.

[0084] In the embodiments of this specification, the electrical signal intensity of the scattered light refers to the relative intensity of the electrical signal corresponding to the scattered light. The distribution of the electrical signal intensity of the scattered light along the distance refers to the distribution of the relative intensity of the electrical signal of the scattered light along the distance of the optical fiber. In some embodiments of this specification, the electrical signal intensity distribution along the distance of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light formed by the coherence of the backward Rayleigh light and the continuous laser light may include: the electrical signal intensity distribution curve of the backward Stokes Raman light along the optical fiber to be detected, the electrical signal intensity distribution curve of the backward anti-Stokes Raman light along the optical fiber to be detected, and the electrical signal intensity distribution curve of the backward coherent Rayleigh light along the optical fiber to be detected.

[0085] In other embodiments of the present specification, in order to eliminate or reduce the error caused by the different light speeds of light of different wavelengths in the optical fiber, light speed calibration can be performed before the actual detection of the optical fiber to be detected. Figure 4 shows a schematic diagram of light speed calibration. In Figure 4, the light source 10 inputs a pulsed laser to the calibration experimental optical fiber 50 through the optical circulator 40, and a calibration test point 60 is set in the calibration experimental optical fiber 50. An attenuation point is created at the calibration test point 60 to simulate a fiber connection point; the distance information of the corresponding calibration test point 60 is extracted from the backward Rayleigh light, backward Stokes Raman light, and backward anti-Stokes Raman light obtained by the optical receiving processor 20, and is respectively recorded as L r , L s , L as , with L r As a benchmark, the corresponding correction coefficient (or correction parameter) can be obtained: r =1,

[0086] Therefore, during the detection of the optical fiber to be detected, if the position corresponding to the i-th singular value of the measured backward coherent Rayleigh light is A ri The measured backward Stokes Raman light corresponds to the position point A at the i-th singular value. si The measured backward anti-Stokes Raman light at the position corresponding to the i-th singular value is A asi When , the position correction can be performed according to the following formula:

[0087] Among them, A′ ri is the position of the backward coherent Rayleigh light after the i-th singular value correction, A′ si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

[0088] In some embodiments of the present specification, determining the target position of the optical fiber splicing point on the optical fiber to be detected based on the distribution of the electrical signal strength along the distance may include:

[0089] (1) The positions of all singular values ​​of the electric signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as a first position point set; the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution are taken as a second position point set; and the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution are taken as a third position point set.

[0090] For example, in the exemplary embodiment shown in FIG6 , the first position point set corresponding to all singular values ​​in the backward Rayleigh light is {A r1}, the second position point set corresponding to all singular values ​​of backward Stokes Raman light is {A s1 ,A s2 ,A s3}, the third position point set corresponding to all singular values ​​of backward anti-Stokes Raman light {A as1 ,A as2 ,A as3 ,A as4}.

[0091] (2) taking the union of the second position point set and the second position point set;

[0092] For example, in the exemplary embodiment shown in FIG. 6 above, {A s1 ,A s2 ,A s3} and {A as1 ,A as2 ,A as3 ,A as4}.

[0093] (3) calculating the difference between the union and the first set of position points;

[0094] For example, in the exemplary embodiment shown in FIG. 6 above, it is assumed that A s1 With A as2 For the same location, A s2 With A as3 For the same location, A s3 With A as4 is also the same position point, then {A s1 ,A s2 ,A s3} and {A as1 ,A as2 ,A as3 ,A as4} can be represented by {A as1 ,A as2 ,A as3 ,A as4} means (can also be expressed as {A s1 ,As2 ,A s3 ,A as4}); if A r1 Also with A s2 、A as3 For the same position point, then {A as1 ,A as2 ,A as3 ,A as4} and {A r1} can be expressed as {A as1 ,A as2 ,A as4}.

[0095] (4) using the position point in the difference set as the target position of the optical fiber splicing point on the optical fiber to be detected;

[0096] For example, in the exemplary embodiment shown in FIG6 above, the difference set {A as1 ,A as2 ,A as4 The three position points in} are the locations of the three optical fiber splicing points on the optical fiber to be detected (ie, the target positions).

[0097] It should be noted that, in the union and difference sets in the embodiments of this specification, position points whose position offset is less than a preset value are regarded as the same position point.

[0098] Because the optical fiber is buried underground, when determining the target position of the fiber splice on the optical fiber to be tested, it is still difficult to directly determine where the target position corresponds to the surface of the earth. Therefore, based on the determination of the target position of the fiber splice on the optical fiber to be tested, specific vibrations can be excited on the surface along the optical fiber to be tested to determine the surface position corresponding to the target position. In addition, an approximate position (pre-estimated surface position) can be estimated based on the target position of the fiber splice. When specific vibrations are excited along the optical fiber to be tested starting from the pre-estimated surface position, it can be helpful to find the surface position corresponding to the target position more quickly, thereby improving detection efficiency.

[0099] In the embodiments of this specification, specific vibration refers to mechanical vibration with specific vibration characteristics, so as to clearly distinguish it from the mechanical vibration interference in the test environment, thereby facilitating the identification of the corresponding position of the vibration excitation position on the optical fiber to be tested from the vibration signal in the backward coherent Rayleigh light obtained under the excitation of the specific vibration.

[0100] For example, in an exemplary embodiment of the present specification, the specific vibration may be the vibration generated by hitting a surface location multiple times (for example, three times in a row); then, in the vibration signal in the backward coherent Rayleigh light obtained under the excitation of the specific vibration, the position where multiple consecutive singular values ​​appear is the corresponding position of the vibration excitation position on the optical fiber to be detected.

[0101] For example, in another exemplary embodiment of the present specification, the specific vibration may be a specific frequency H v Mechanical vibration; During detection, a bandpass filter can be used to filter to identify the corresponding position of the vibration excitation position on the optical fiber to be detected. The filtering frequency range is (H v -Δ,H v +Δ), where Δ can be customized (e.g., Δ=5 Hz).

[0102] As shown in Figure 5, assuming that there is an optical fiber 30 to be detected buried under the surface 70, and there is a fiber optic connection point 90 on the optical fiber 30 to be detected (assuming that the fiber optic connection point 90 is at a distance of l0 from the left optical path interface outlet on the optical fiber 30 to be detected), specific vibrations can be excited on the surface 70 along the optical fiber to be detected (for example, specific vibrations can be excited at the surface excitation position 80 represented by the black circle in 5) to determine the surface position corresponding to the target position. In the process of exciting specific vibrations along the surface 70 of the optical fiber to be detected, the optical receiving processor can obtain the vibration signal in the backward coherent Rayleigh light obtained when the specific vibrations are excited at the surface position along the optical fiber to be detected; then the relative position of the surface excitation position on the optical fiber to be detected is determined based on the vibration signal; when the relative position is not the target position l0, it can be moved along the extension direction of the optical fiber to be detected to the next surface excitation position to excite the specific vibration again (for example, from the surface excitation position 80 represented by the black circle on the surface 70 in Figure 5, move backward to another surface excitation position represented by the dotted circle, and excite the specific vibration again) to continue detection; in this way, until the relative position of the surface excitation position on the optical fiber to be detected coincides with the target position (when the difference between the two is less than the preset value, it can be considered that the two positions coincide), and the surface excitation position at this time is regarded as the surface position of the optical fiber connection point.

[0103] When there are multiple optical fiber connection points on the optical fiber to be detected, the above-mentioned method can be used to determine the surface position of each optical fiber connection point.

[0104] The embodiments of this specification provide a method for detecting the surface position of an optical fiber splicing point, which can be applied to the above-mentioned optical fiber splicing point surface position detection device. Referring to FIG. 7 , in some embodiments of this specification, the method for detecting the surface position of an optical fiber splicing point can include the following steps:

[0105] Step 701: Provide a continuous laser with a line width smaller than a preset value and a pulse laser converted from the continuous laser, and input the pulse laser into the optical fiber to be detected.

[0106] Step 702: Receive backscattered light in the optical fiber to be detected.

[0107] Step 703: Decompose the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light, and backward Rayleigh light according to wavelength.

[0108] Step 704: Determine the distribution of the electrical signal intensities of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light formed by the coherence of the backward Rayleigh light and the continuous laser light along the distance.

[0109] Step 705: Determine the target position of the optical fiber splicing point on the optical fiber to be detected based on the distribution of the electrical signal strength along the distance.

[0110] Step 706: Determine the relative position of the surface excitation position on the optical fiber to be detected based on the vibration signal in the backward coherent Rayleigh light obtained when a specific vibration is excited at the surface position along the optical fiber to be detected.

[0111] Step 707: Determine whether the relative position is consistent with the target position.

[0112] If the relative position is consistent with the target position, step 708 is executed; if the relative position is inconsistent with the target position, the process jumps to step 706 (i.e., moves to the next surface excitation position to excite the specific vibration again and re-detects).

[0113] Step 708: Use the surface excitation position as the surface position of the optical fiber connection point.

[0114] In some embodiments of this specification, the method for detecting the surface position of an optical fiber splicing point may further include:

[0115] When the relative position is inconsistent with the target position, re-detection is performed according to specific vibration excited at the next surface position along the optical fiber to be detected.

[0116] In some embodiments of the present specification, in the method for detecting the surface position of an optical fiber splice point, determining the target position of the optical fiber splice point on the optical fiber to be detected based on the distribution of the electrical signal strength along the distance includes:

[0117] The positions of all singular values ​​of the electric signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as a first position point set; the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution are taken as a second position point set; the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution are taken as a third position point set;

[0118] Taking the union of the second position point set and the second position point set;

[0119] Calculating a difference between the union and the first set of position points;

[0120] Using the position point in the difference set as the target position of the optical fiber splicing point on the optical fiber to be detected;

[0121] Among them, in the union set and the difference set, position points whose position offset is less than a preset value are regarded as the same position point.

[0122] In the surface position detection method of an optical fiber splicing point in some embodiments of the present specification, the distribution of the electrical signal strength along the distance includes the distribution of the electrical signal strength along the distance corrected according to the following formula;

[0123] Among them, A ri is the position point corresponding to the i-th singular value of the backward coherent Rayleigh light, A si is the position point corresponding to the i-th singular value of the backward Stokes Raman light, A asi is the position corresponding to the i-th singular value of the backward anti-Stokes Raman light, A′ ri A′ is the position of the backward coherent Rayleigh light in the optical fiber to be detected after the i-th singular value correction, si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

[0124] In the surface location detection method of an optical fiber splicing point in some embodiments of the present specification, the specific vibration is a specific vibration of a specified frequency.

[0125] In the surface position detection method of an optical fiber splicing point in some embodiments of the present specification, the initial surface excitation position corresponding to the excitation of the specific vibration is the estimated surface position corresponding to the target position.

[0126] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this specification, the functions of each unit can be implemented in the same or multiple hardware and / or software.

[0127] Although the process flows described above include multiple operations occurring in a particular order, it should be understood that these processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0128] It should be noted that in the embodiments of this specification, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved are all information and data authorized by the user and fully authorized by all parties.

[0129] Embodiments of this specification also provide a computer device. As shown in FIG8 , in some embodiments of this specification, the computer device 802 may include one or more processors 804, such as one or more central processing units (CPUs) or graphics processing units (GPUs), each of which may implement one or more hardware threads. The computer device 802 may also include any memory 806 for storing any type of information, such as code, settings, data, etc. In a specific embodiment, the computer program on the memory 806 and executable on the processor 804 may execute instructions for the method for detecting the surface location of a fiber splice point described in any of the above embodiments when executed by the processor 804. For example, and without limitation, the memory 806 may include any one or more combinations of the following: any type of RAM, any type of ROM, a flash memory device, a hard disk, an optical disk, etc. More generally, any memory may use any technology to store information. Furthermore, any memory may provide volatile or non-volatile retention of information. Furthermore, any memory may represent a fixed or removable component of the computer device 802. In one embodiment, when the processor 804 executes the associated instructions stored in any memory or combination of memories, the computer device 802 can perform any operation of the associated instructions. The computer device 802 also includes one or more drive mechanisms 808 for interacting with any memory, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0130] The computer device 802 may also include an input / output interface 810 (I / O) for receiving various inputs (via input devices 812) and for providing various outputs (via output devices 814). A specific output mechanism may include a presentation device 816 and an associated graphical user interface 818 (GUI). In other embodiments, the input / output interface 810 (I / O), input devices 812, and output devices 814 may not be included, and the computer device 802 may simply be a computer device in a network. The computer device 802 may also include one or more network interfaces 820 for exchanging data with other devices via one or more communication links 822. One or more communication buses 824 couple the components described above together.

[0131] The communication link 822 can be implemented in any manner, for example, through a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 822 can include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0132] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), computer-readable storage media, and computer program products of some embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processor to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processor produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0133] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processor to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processor so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0135] In a typical configuration, a computer device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0136] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0137] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computer device. As defined in this specification, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0138] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0139] Embodiments of this specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. Embodiments of this specification may also be practiced in distributed computing environments where tasks are performed by remote processors connected via a communications network. In distributed computing environments, program modules may be located in local and remote computer storage media, including storage devices.

[0140] It should also be understood that in the embodiments of this specification, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0141] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the method embodiments are generally similar to the device embodiments, so the description is relatively simple. For relevant parts, refer to the description of the device embodiments.

[0142] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0143] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A device for detecting the surface position of an optical fiber connection point, characterized in that: include: A light source, used to provide a continuous laser with a line width less than a preset value and a pulse laser converted from the continuous laser, and input the pulse laser into the optical fiber to be detected; The optical receiving processor is used to receive the backscattered light in the optical fiber to be detected; decompose the backscattered light into back Stokes Raman light, back anti-Stokes Raman light and back Rayleigh light according to the wavelength; determine the electrical signal intensity distribution along the distance of the back Stokes Raman light, the back anti-Stokes Raman light and the back coherent Rayleigh light formed by the back Rayleigh light and the continuous laser coherence; determine the target position of the optical fiber connection point on the optical fiber to be detected according to the electrical signal intensity distribution along the distance; determine the relative position of the surface excitation position on the optical fiber to be detected according to the vibration signal in the back coherent Rayleigh light obtained by exciting specific vibration along the surface position of the optical fiber to be detected; when the relative position is consistent with the target position, the surface excitation position is used as the surface position of the optical fiber connection point.

2. The optical fiber connection point surface position detection device according to claim 1, characterized in that: The optical receiving processor is also used for: When the relative position is inconsistent with the target position, re-detection is performed according to specific vibration excited at the next surface position along the optical fiber to be detected.

3. The optical fiber connection point surface position detection device according to claim 1, characterized in that: Determining the target position of the optical fiber connection point on the optical fiber to be detected according to the distribution of the electrical signal strength along the distance includes: The positions of all singular values ​​of the electric signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as the first position point set; the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution are taken as the second position point set; the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution are taken as the third position point set; Taking the union of the second position point set and the second position point set; Calculating a difference between the union and the first set of position points; Using the position point in the difference set as the target position of the optical fiber connection point on the optical fiber to be detected; Among them, in the union set and the difference set, the position points whose position offset is less than a preset value are regarded as the same position point.

4. The optical fiber connection point surface position detection device according to claim 1, characterized in that: The distribution of electric signal strength along distance includes the distribution of electric signal strength along distance corrected according to the following formula; Among them, A ri is the position point corresponding to the i-th singular value of the backward coherent Rayleigh light, A si is the position point corresponding to the i-th singular value of the backward Stokes Raman light, A asi is the position point corresponding to the i-th singular value of the backward anti-Stokes Raman light, A′ ri A′ is the position of the backward coherent Rayleigh light in the optical fiber to be detected after the i-th singular value correction. si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

5. The optical fiber connection point surface position detection device according to claim 1, characterized in that: The initial ground excitation position corresponding to the excitation specific vibration is the estimated ground surface position corresponding to the target position.

6. The optical fiber connection point surface position detection device according to claim 1, characterized in that: The light source comprises: A laser, used for generating a continuous laser with a line width smaller than a preset value; An optical splitter is used to split the continuous laser into a first continuous laser and a second continuous laser, provide the first continuous laser to a pulse generator, and provide the second continuous laser to the optical receiving processor; A pulse generator, used for converting the first continuous laser into a pulse laser; The optical fiber amplifier is used to amplify the pulse laser and input the amplified pulse laser into the optical fiber to be detected through an optical circulator.

7. The optical fiber connection point surface position detection device according to claim 6, characterized in that: The optical receiving processor comprises: An optical filter, used for receiving the backscattered light in the optical fiber to be detected through the optical circulator, and decomposing the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light and backward Rayleigh light according to wavelength; A first photodetector, used for converting backward coherent Rayleigh light formed by the coherence of the first continuous laser beam and the backward Rayleigh light into a corresponding electrical signal; a second photodetector, configured to convert the backward Stokes Raman light into a corresponding electrical signal; a third photodetector, configured to convert the backward anti-Stokes Raman light into a corresponding electrical signal; A data acquisition card, used for synchronously acquiring the electrical signals output by the first photodetector, the second photodetector and the third photodetector; The processing module is used to determine the distribution of the electrical signal intensity of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light along the distance according to the electrical signal collected by the data acquisition card; determine the target position of the optical fiber connection point on the optical fiber to be detected according to the distribution of the electrical signal intensity along the distance; determine the relative position of the surface excitation position on the optical fiber to be detected according to the vibration signal in the backward coherent Rayleigh light obtained under the excitation of specific vibration along the surface position of the optical fiber to be detected; when the relative position is consistent with the target position, the surface excitation position is used as the surface position of the optical fiber connection point.

8. The optical fiber connection point surface position detection device according to claim 7, characterized in that: The optical receiving processor also includes: The synchronization control module is used to provide a synchronization signal to the pulse generator and the data acquisition card so that the pulse generator and the data acquisition card work synchronously.

9. A method for detecting the surface position of an optical fiber connection point, characterized in that: include: Providing a continuous laser with a line width smaller than a preset value and a pulse laser converted from the continuous laser, and inputting the pulse laser into the optical fiber to be detected; Receiving backscattered light in the optical fiber to be detected; Decomposing the backscattered light into backward Stokes Raman light, backward anti-Stokes Raman light and backward Rayleigh light according to wavelength; Determine the distribution of the electrical signal intensities of the backward Stokes Raman light, the backward anti-Stokes Raman light, and the backward coherent Rayleigh light formed by the backward Rayleigh light and the continuous laser coherence along the distance; Determine the target position of the optical fiber connection point on the optical fiber to be detected according to the distribution of the electrical signal strength along the distance; Determine the relative position of the ground surface excitation position on the optical fiber to be detected according to the vibration signal in the backward coherent Rayleigh light obtained when a specific vibration is excited at the ground surface position along the optical fiber to be detected; When the relative position is consistent with the target position, the surface excitation position is used as the surface position of the optical fiber connection point.

10. The method for detecting the surface position of an optical fiber connection point according to claim 9, characterized in that: Also includes: When the relative position is inconsistent with the target position, re-detection is performed according to specific vibration excited at the next surface position along the optical fiber to be detected.

11. The method for detecting the surface position of an optical fiber connection point according to claim 9, characterized in that: Determining the target position of the optical fiber connection point on the optical fiber to be detected according to the distribution of the electrical signal strength along the distance includes: The positions of all singular values ​​of the electrical signal intensity of the backward coherent Rayleigh light along the distance distribution are taken as the first a first set of position points; taking the positions of all singular values ​​of the electric signal intensity of the backward Stokes Raman light along the distance distribution as a second set of position points; taking the positions of all singular values ​​of the electric signal intensity of the backward anti-Stokes Raman light along the distance distribution as a third set of position points; Taking the union of the second position point set and the second position point set; Calculating a difference between the union and the first set of position points; Using the position point in the difference set as the target position of the optical fiber connection point on the optical fiber to be detected; Among them, in the union set and the difference set, the position points whose position offset is less than a preset value are regarded as the same position point.

12. The method for detecting the surface position of an optical fiber connection point according to claim 9, characterized in that: The distribution of electric signal strength along distance includes the distribution of electric signal strength along distance corrected according to the following formula; Among them, A ri is the position point corresponding to the i-th singular value of the backward coherent Rayleigh light, A si is the position point corresponding to the i-th singular value of the backward Stokes Raman light, A asi is the position point corresponding to the i-th singular value of the backward anti-Stokes Raman light, A′ ri A′ is the position of the backward coherent Rayleigh light in the optical fiber to be detected after the i-th singular value correction. si is the position of the backward Stokes Raman light after the i-th singular value correction, A' asi is the position of the backward anti-Stokes Raman light after the i-th singular value correction, a r A ri The correction factor, a s A si The correction factor, a as A ri The correction factor of .

13. The method for detecting the surface position of an optical fiber splicing point according to claim 9, wherein: The initial ground excitation position corresponding to the excitation specific vibration is the estimated ground surface position corresponding to the target position.

14. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: When the computer program is executed by the processor, the computer program executes the instructions of the method according to any one of claims 9 to 13.

15. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor of a computer device, the computer program executes the instructions of the method according to any one of claims 9 to 13.

16. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor of a computer device, the computer program executes instructions of the method according to any one of claims 9 to 13.

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