Optical fiber breakpoint detection method, device and system and storage medium

Abstract

The invention relates to an optical fiber breakpoint detection method, device and system and a storage medium, and belongs to the technical field of optical fiber detection, and the method comprises the steps: transmitting a first optical signal to an optical fiber, and obtaining a second optical signal reflected back from the optical fiber; determining the number of normally working target gratings according to the second optical signal; judging whether the number of the target gratings is equal to that of the gratings; if the number of the target gratings is not equal to that of the gratings, determining that breakpoints exist in the optical fiber; and determining the position of the breakpoint in the optical fiber according to the number of the target gratings and the distance between the target gratings. By monitoring the working state of each grating in the optical fiber, whether a breakpoint exists in the optical fiber or not and the position of the breakpoint can be accurately judged according to the working state of each grating.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber detection technology, and in particular to an optical fiber breakpoint detection method, device, system and storage medium. Background Art

[0002] With the continuous development of the online preparation process of grating array optical fiber, the online preparation of hundreds of thousands of grating array optical fibers with low reflectivity and high mechanical strength without fusion points has been achieved, breaking the bottleneck of traditional preparation process and greatly promoting the development of distributed sensing technology based on temperature, strain and vibration of fiber grating. In addition, the quasi-distributed sensing of FBG array optical fiber has been widely used in large-scale infrastructure projects, railway tunnels, petroleum and petrochemical fields in recent years. Based on this, how to accurately find the location of the optical fiber breakpoint in the laying and maintenance of array optical fiber has become a crucial issue.

[0003] The traditional method of detecting fiber breakpoints is to use an optical time-domain reflectometer (OTDR) device for detection. The main principle is that when the fiber is affected by external temperature and stress, the refractive index of the fiber will change. The round-trip time of light in the fiber and the speed of light in the fiber can be used to calculate the location of the fiber breakpoint. However, this method is highly dependent on the speed of light in the fiber. Once there is a gap between the actual speed of light in the fiber and the speed involved in the calculation, the estimated position will have a large error. Summary of the invention

[0004] In view of this, it is necessary to provide a method, device, system and storage medium for detecting breakpoints of optical fibers, so as to solve the problem of inaccurate positioning of breakpoints of optical fibers in the prior art.

[0005] In order to solve the above problems, in a first aspect, the present invention provides a method for detecting breakpoints of an optical fiber, wherein the optical fiber includes a plurality of gratings, and the method comprises: Transmitting a first optical signal to the optical fiber, and acquiring a second optical signal reflected back from the optical fiber; Determine the number of target gratings that are operating normally according to the second optical signal; Determining whether the number of the target gratings is equal to the number of the gratings; If the number of the target gratings is not equal to the number of the gratings, it is determined that there are breakpoints in the optical fiber; The position of the breakpoint in the optical fiber is determined according to the number of the target gratings and the distance between the target gratings.

[0006] Optionally, transmitting the first optical signal to the optical fiber and acquiring the second optical signal reflected from the optical fiber includes: Transmitting a first optical signal according to a preset wavelength scanning range and wavelength scanning step, and acquiring a second optical signal reflected back from the optical fiber after each transmission of the first optical signal; Determining the number of target gratings that work normally according to the second optical signal includes: Converting the second optical signal into a first electrical signal, and performing sampling processing on the first electrical signal according to a preset sampling rate to obtain a plurality of sampling points; Superimposing the second electrical signals of each sampling point obtained after each emission of the first optical signal to obtain a third electrical signal of each sampling point; The number of target gratings operating normally is determined according to the third electrical signals at each sampling point.

[0007] Optionally, determining the number of target gratings that are operating normally according to the third electrical signal at each sampling point includes: Determine a fourth electrical signal at a peak position from the third electrical signal at each sampling point; The number of the fourth electrical signals is taken as the number of the target gratings operating normally.

[0008] Optionally, the method further includes: Determining whether the fourth electrical signal is divided into two parts; wherein a signal strength difference between the fourth electrical signal of the first part and the fourth electrical signal of the second part is greater than a preset threshold; If the fourth electrical signal is divided into two parts, it is determined that the optical fiber is under stress.

[0009] Optionally, the method further includes: When it is determined that there is a breakpoint in the optical fiber, or it is determined that the optical fiber is under stress, an alarm message is generated; wherein the alarm message includes at least one of the position of the breakpoint in the optical fiber and the stress position in the optical fiber; the stress position is determined based on a target fourth electrical signal at the boundary between the first part and the second part.

[0010] Optionally, the gratings are arranged equidistantly, and determining the position of the breakpoint in the optical fiber according to the number of the target gratings and the distance between the target gratings includes: The position of the breakpoint in the optical fiber is determined by the following formula:

[0011] in, S Indicates the distance between the breakpoint and the starting point of the optical fiber. N represents the number of target gratings, D Indicates the spacing between target gratings.

[0012] Optionally, the method further includes: If the number of the target gratings is equal to the number of the gratings, it is determined that no breakpoints exist in the optical fiber.

[0013] In a second aspect, the present invention further provides a breakpoint detection device for an optical fiber, wherein the optical fiber includes a plurality of gratings, and the device includes: A light source module, used for transmitting a first optical signal to the optical fiber; A reflected light receiving module, used for acquiring a second optical signal reflected back from the optical fiber; A data processing module is used to determine the number of target gratings that work normally according to the second optical signal; determine whether the number of the target gratings is equal to the number of the gratings; if the number of the target gratings is not equal to the number of the gratings, determine that there are breakpoints in the optical fiber; and determine the position of the breakpoint in the optical fiber according to the number of the target gratings and the distance between the target gratings.

[0014] In a third aspect, the present invention further provides a system, comprising an optical fiber and the above-mentioned breakpoint detection device, wherein the optical fiber includes a plurality of gratings, and the breakpoint detection device is used to implement the steps in any one of the above-mentioned optical fiber breakpoint detection methods.

[0015] In a fourth aspect, the present invention further provides a computer-readable storage medium for storing a computer-readable program, wherein the program or instructions, when executed by a processor, can implement the steps in any one of the above-mentioned optical fiber breakpoint detection methods.

[0016] The beneficial effects of the present invention are: The present invention can determine the number of target gratings that are working normally in the optical fiber by emitting a first optical signal to the optical fiber and monitoring and analyzing the second optical signal reflected back in the optical fiber. According to the number of target gratings, it can be accurately determined whether there are breakpoints in the optical fiber. When it is determined that there are breakpoints, the position of the breakpoints can be calculated according to the number of target gratings and the distance between the target gratings. The positioning of the breakpoint position by the present invention mainly depends on the spacing between the gratings, and does not depend on the speed of light in the optical fiber. Therefore, changes in the speed of light in the optical fiber will not affect the positioning accuracy. Thanks to the optical fiber drawing technology, the grating writing accuracy during the drawing process can reach the centimeter level. Therefore, the positioning accuracy of the present invention can also reach the centimeter level, with smaller errors and more accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for detecting breakpoints of an optical fiber provided by the present invention; Figure 2 A schematic flow chart of another optical fiber breakpoint detection method provided by the present invention; Figure 3 A schematic structural diagram of an embodiment of an optical fiber breakpoint detection device provided by the present invention; Figure 4 A schematic structural diagram of an embodiment of the optical fiber breakpoint detection system provided by the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0020] The terms "first", "second", etc., involved in the embodiments of the present invention are used to distinguish similar objects, but are not used to describe a specific order or sequence, nor are they used to indicate or imply their relative importance or implicitly indicate the number of technical features indicated. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] Reference Figure 1 , shows a schematic flow chart of an embodiment of a method for detecting breakpoints of an optical fiber provided by the present invention, wherein the optical fiber includes a plurality of gratings, and the method includes: S101, transmitting a first optical signal to an optical fiber, and acquiring a second optical signal reflected from the optical fiber.

[0023] S102, determining the number of target gratings operating normally according to the second optical signal.

[0024] S103, determining whether the number of target gratings is equal to the number of gratings.

[0025] S104: If the number of target gratings is not equal to the number of gratings, it is determined that there are breakpoints in the optical fiber.

[0026] S105, determining the position of the breakpoint in the optical fiber according to the number of target gratings and the distance between the target gratings.

[0027] The grating can reflect back the light signal of a specific wavelength. When there is no breakpoint in the optical fiber, all the gratings in the optical fiber can reflect back the light signal normally. When there is a breakpoint in the optical fiber, the grating before the breakpoint can reflect back the light signal normally, while the grating after the breakpoint cannot reflect back the light signal normally. Therefore, by emitting the first light signal to the optical fiber and analyzing the reflected second light signal, the number of target gratings working normally in the optical fiber can be determined.

[0028] When the number of target gratings is equal to the total number of gratings in the optical fiber, it is determined that there is no breakpoint in the optical fiber; when the number of target gratings is less than the total number of gratings in the optical fiber, it is determined that there is a breakpoint in the optical fiber. When it is determined that there is a breakpoint in the optical fiber, the position of the breakpoint in the optical fiber can be further determined according to the number of target gratings and the distance between the target gratings.

[0029] The present invention can determine the number of target gratings that are working normally in the optical fiber by emitting a first optical signal to the optical fiber and monitoring and analyzing the second optical signal reflected back in the optical fiber. According to the number of target gratings, it can be accurately determined whether there are breakpoints in the optical fiber. When it is determined that there are breakpoints, the position of the breakpoints can be calculated according to the number of target gratings and the distance between the target gratings. The positioning of the breakpoint position by the present invention mainly depends on the spacing between the gratings, and does not depend on the speed of light in the optical fiber. Therefore, changes in the speed of light in the optical fiber will not affect the positioning accuracy. Thanks to the optical fiber drawing technology, the grating writing accuracy during the drawing process can reach the centimeter level. Therefore, the positioning accuracy of the present invention can also reach the centimeter level, with smaller errors and more accurate positioning.

[0030] In one embodiment, the gratings in the optical fiber can be arranged at equal distances, and the position of the breakpoint in the optical fiber can be determined by the following formula:

[0031] in, S Indicates the distance between the breakpoint and the starting point of the optical fiber. N represents the number of target gratings, D Indicates the spacing between target gratings.

[0032] In one embodiment, S101 may specifically include: transmitting a first optical signal according to a preset wavelength scanning range and wavelength scanning step, and acquiring a second optical signal reflected back in the optical fiber after each emission of the first optical signal; S102 may specifically include: converting the second optical signal into a first electrical signal, and sampling the first electrical signal according to a preset sampling rate to obtain a plurality of sampling points; superimposing the second electrical signals of each sampling point obtained after each emission of the first optical signal to obtain a third electrical signal of each sampling point; and determining the number of target gratings operating normally according to the third electrical signals of each sampling point.

[0033] For example, if the fiber length is 2 km, the gratings are equidistantly set, the grating spacing is 10 cm, the central wavelength of the grating is 1550 nm, the wavelength scanning range is set to 1549500~1553490 pm, a total of 4 nm, and the wavelength scanning step is 20 pm, then the entire complete scanning cycle includes 200 steps, the sampling rate is 2 GHz (the sampling rate must not be lower than 2 GHz), and the propagation speed of light in the fiber is 2.0×10 8 m / s. According to the principle of optical time domain reflection, each time the first light signal is emitted, that is, after one step, the light signal reflected back by the grating will be returned in the spatial arrangement order of the grating. After obtaining the returned second light signal, the second light signal can be converted into a first electrical signal, and then the first electrical signal can be sampled at a preset sampling rate to obtain multiple sampling points, one sampling point corresponding to one second electrical signal. The amount of data of the second electrical signal data for each step can also be calculated by the following formula:

[0034] in, Indicates the amount of data, Indicates the length of the optical fiber. represents the sampling rate, It represents the speed of light propagation in the optical fiber.

[0035] After substituting into the above formula, we can calculate N =40000, that is, under this condition, the amount of data / sampling points in one step is 40000. The calculated sampling points can be used to check with the actually acquired sampling points.

[0036] After completing a scan cycle, the 200 steps of data in a scan cycle can be formed into a Each column represents the number of sampling points and each row represents the number of steps.

[0037]

[0038] Add these 200 rows of data to get a new set of data: ,in D 1= D 1-1+ D 2-1+ D 3-1+ …… + D 200-1, D 2~ D 40000 is calculated by analogy. D1 ~ D 40000 respectively correspond to a third electrical signal.

[0039] Since only at the location where the grating exists will there be a strong signal after the sampling points are accumulated, while at the location where the grating does not exist, the signal after the sampling points are accumulated is basically a noise signal, the number of target gratings can be determined based on the signal strength of the third electrical signal at each sampling point after accumulation.

[0040] The embodiment of the present invention sets a scanning cycle, and superimposes the second electrical signals of each sampling point in a scanning cycle, performs signal enhancement processing to obtain a third electrical signal, and then the target grating can be more accurately determined according to the third electrical signal. In addition, the present invention mainly relies on the physical distance between grating points and the number of grating points, so it is not affected by the speed of light in the optical fiber, and thus external factors and environment will not cause measurement errors, and the measurement accuracy is at the centimeter level.

[0041] In one embodiment, the wavelength scanning range is determined according to the central wavelength of the grating and the wavelength sampling length. For example, in the above example, the central wavelength of the grating is 1550 nm, the wavelength scanning range is set to 1549500-1553490 pm, and the sampling length is 4 nm in total.

[0042] In one embodiment, the step of determining the number of target gratings operating normally according to the third electrical signal at each sampling point may specifically include: determining the fourth electrical signal at the peak position from the third electrical signal at each sampling point; and using the number of the fourth electrical signals as the number of target gratings operating normally.

[0043] For example, you can Peak search processing is performed, and one peak position corresponds to one target grating.

[0044] In one embodiment, the optical fiber breakpoint detection method may further include: determining whether the fourth electrical signal is divided into two parts; wherein the signal strength difference between the fourth electrical signal of the first part and the fourth electrical signal of the second part is greater than a preset threshold; if the fourth electrical signal is divided into two parts, it is determined that the optical fiber is under stress.

[0045] For example, if an optical fiber has 50,000 gratings and the factory grating spacing of this optical fiber is 10 cm, the length of this optical fiber is 5 km with an accuracy within 10 cm. During construction and maintenance, if the number of grating points is found to be less than 50,000 points, it is determined that there are breakpoints in the optical fiber. If the grating signal is very weak after a certain point, the optical fiber after the grating point may be broken or stressed.

[0046] In one embodiment, the optical fiber breakpoint detection method may further include: when it is determined that there is a breakpoint in the optical fiber, or when it is determined that the optical fiber is under stress, generating an alarm message; wherein the alarm information includes at least one of the position of the breakpoint in the optical fiber and the stress position in the optical fiber; the stress position is determined based on a target fourth electrical signal at the boundary between the first part and the second part.

[0047] Reference Figure 2 , showing a schematic flow chart of another optical fiber breakpoint detection method provided by the present invention. The optical fiber breakpoint detection device is connected to the optical fiber to be tested, and a first optical signal is emitted to the optical fiber. Then, the intensity of the second optical signal reflected back by the grating is checked through the breakpoint detection device. If the light source is too strong or too weak, it will affect the recognition of the number of gratings. Therefore, it is necessary to adjust the light intensity of the first optical signal to an appropriate level, and perform statistics of the number of gratings, i.e., channel calibration, through the software. The calibrated number of gratings, the actual length of the optical cable, and the spacing of the gratings are used to determine whether there are breakpoints and the position of the breakpoints in the optical fiber.

[0048] Reference Figure 3 , shows a schematic structural diagram of an embodiment of a breakpoint detection device for an optical fiber provided by the present invention, wherein the optical fiber includes a plurality of gratings, and the device 30 includes: The light source module 301 is used to transmit a first optical signal to the optical fiber; A reflected light receiving module 302 is used to obtain a second optical signal reflected back from the optical fiber; The data processing module 303 is used to determine the number of target gratings that work normally according to the second optical signal; determine whether the number of target gratings is equal to the number of gratings; if the number of target gratings is not equal to the number of gratings, determine that there are breakpoints in the optical fiber; and determine the position of the breakpoints in the optical fiber according to the number of target gratings and the distance between the target gratings.

[0049] The present invention also provides an optical fiber breakpoint detection system, the system comprising: an optical fiber and the above-mentioned breakpoint detection device, wherein the optical fiber includes multiple gratings, and the breakpoint detection device is used to implement the steps in any one of the above-mentioned optical fiber breakpoint detection methods.

[0050] Reference Figure 4, showing a schematic diagram of the structure of an embodiment of the optical fiber breakpoint detection system provided by the present invention. The light source module 301 includes: a wavelength-adjustable swept-frequency light source 3011 and a pulse modulation unit 3012. The reflected light receiving module 302 includes an optical circulator 3021 and a photoelectric conversion unit 3022. The data processing module 303 includes a collection unit 3031 and a host computer processing unit 3032. The output end of the wavelength-adjustable swept-frequency light source 3011 is connected to the input end of the pulse modulation unit 3012, the output end of the pulse modulation unit 3012 is connected to the input end of the optical circulator 3021, the output end of the optical circulator 3021 is connected to the grating array 40, the other output end of the optical circulator 3021 is connected to the input end of the photoelectric conversion unit 3022, the output end of the photoelectric conversion unit 3022 is connected to the collection unit 3031, and the collection unit 3031 then transmits the data to the host computer processing unit 3032 through PCIE.

[0051] Among them, the wavelength-adjustable swept-frequency light source 3011 is used to emit continuously changing swept-frequency light, and the pulse modulation unit 3012 is used to modulate the swept-frequency light into pulse light, and after each modulation is completed, an electrical synchronization pulse is generated to the acquisition unit 3031, indicating that the wavelength switching has been completed and is in a stable state. After obtaining the pulse reply of unit 3031, the pulse modulation unit 3012 emits pulse light again.

[0052] The grating array 40 can write gratings with different spacings according to different needs. The fiber drawing online grating writing technology is used. All grating wavelengths are the same, and the writing spacing can reach the centimeter level. After the pulse light is irradiated on the grating array 40, according to the principle of optical time domain reflection, the light signals reflected back by the gratings at different distances will arrive at the optical circulator 3021 in chronological order.

[0053] The optical circulator 3021 is used to send the second optical signal reflected back by the grating array 40 to the photoelectric conversion unit 3022 .

[0054] The photoelectric conversion unit 3022 is used to convert the second optical signal into a first electrical signal, and to appropriately amplify the first electrical signal before sending it to the collection unit 3031 .

[0055] The acquisition unit 3031 mainly includes an A / D sampling chip and an FPGA control processing chip. The A / D chip converts analog signals into digital signals. The higher the breakpoint position accuracy requirement, the higher the A / D sampling rate. Under the signal trigger of the pulse modulation unit 3012, the FPGA controls the pulse modulation unit 3012 to emit pulse light and collect digital signals at the same time. The acquisition unit 3031 stores the data collected by a step and sends it to the host computer processing unit 3032 through PCIE.

[0056] After receiving the data of the entire scanning cycle, the host computer processing unit 3032 forms a matrix according to the number of steps and sampling points in the entire scanning cycle. The data of the same sampling point is sampled each time in a scanning cycle, and the data of the same sampling point is accumulated to form a light intensity array {1, 2, 3...N}. The array is traversed to find the position with the largest reflected light intensity, which is considered to be a grating point, and the rest of the positions are considered to have no grating points. After this step, m grating positions {FBG1, FBG2, FBG3...FBGm} can be obtained. Based on the fact that each grating is equidistant when writing, the grating reflection signals of different distances will arrive at the photoelectric conversion module in chronological order. These m gratings can be used to detect grating breakpoints and measure the length of optical fiber.

[0057] It should be noted that the implementation principle or implementation process of the above modules can refer to the above-mentioned embodiment of the optical fiber breakpoint detection method, and will not be described one by one here.

[0058] In one embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by the processor, the steps of any of the above-mentioned optical fiber breakpoint detection methods are implemented.

[0059] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for detecting breakpoints of an optical fiber, characterized in that: The optical fiber includes a plurality of gratings, and the method includes: Transmitting a first optical signal to the optical fiber, and acquiring a second optical signal reflected back from the optical fiber; Determine the number of target gratings that are operating normally according to the second optical signal; Determining whether the number of the target gratings is equal to the number of the gratings; If the number of the target gratings is not equal to the number of the gratings, it is determined that there are breakpoints in the optical fiber; The position of the breakpoint in the optical fiber is determined according to the number of the target gratings and the distance between the target gratings.

2. The optical fiber breakpoint detection method according to claim 1, characterized in that: The transmitting the first optical signal to the optical fiber and acquiring the second optical signal reflected from the optical fiber comprises: Transmitting a first optical signal according to a preset wavelength scanning range and wavelength scanning step, and acquiring a second optical signal reflected back from the optical fiber after each transmission of the first optical signal; Determining the number of target gratings that work normally according to the second optical signal includes: Converting the second optical signal into a first electrical signal, and performing sampling processing on the first electrical signal according to a preset sampling rate to obtain a plurality of sampling points; Superimposing the second electrical signals of each sampling point obtained after each emission of the first optical signal to obtain a third electrical signal of each sampling point; The number of target gratings operating normally is determined according to the third electrical signals at each sampling point.

3. The optical fiber breakpoint detection method according to claim 2, characterized in that: Determining the number of target gratings operating normally according to the third electrical signals at each sampling point includes: Determine a fourth electrical signal at a peak position from the third electrical signal at each sampling point; The number of the fourth electrical signals is taken as the number of the target gratings operating normally.

4. The optical fiber breakpoint detection method according to claim 3, characterized in that: The method further comprises: Determining whether the fourth electrical signal is divided into two parts; wherein a signal strength difference between the fourth electrical signal of the first part and the fourth electrical signal of the second part is greater than a preset threshold; If the fourth electrical signal is divided into two parts, it is determined that the optical fiber is under stress.

5. The optical fiber breakpoint detection method according to claim 4, characterized in that: The method further comprises: When it is determined that there is a breakpoint in the optical fiber, or it is determined that the optical fiber is under stress, an alarm message is generated; wherein the alarm message includes at least one of the position of the breakpoint in the optical fiber and the stress position in the optical fiber; the stress position is determined based on a target fourth electrical signal at the boundary between the first part and the second part.

6. The optical fiber breakpoint detection method according to claim 1, characterized in that: The gratings are arranged equidistantly, and the position of the breakpoint in the optical fiber is determined according to the number of the target gratings and the distance between the target gratings, comprising: The position of the breakpoint in the optical fiber is determined by the following formula: in, S Indicates the distance between the breakpoint and the starting point of the optical fiber. N represents the number of target gratings, D Indicates the spacing between target gratings.

7. The optical fiber breakpoint detection method according to claim 1, characterized in that: The method further comprises: If the number of the target gratings is equal to the number of the gratings, it is determined that no breakpoints exist in the optical fiber.

8. An optical fiber breakpoint detection device, characterized in that: The optical fiber includes a plurality of gratings, and the device includes: A light source module, used for transmitting a first optical signal to the optical fiber; A reflected light receiving module, used for acquiring a second optical signal reflected back from the optical fiber; A data processing module is used to determine the number of target gratings that work normally according to the second optical signal; determine whether the number of the target gratings is equal to the number of the gratings; if the number of the target gratings is not equal to the number of the gratings, determine that there are breakpoints in the optical fiber; and determine the position of the breakpoint in the optical fiber according to the number of the target gratings and the distance between the target gratings.

9. An optical fiber breakpoint detection system, characterized in that: It comprises an optical fiber and the breakpoint detection device as described in claim 8, wherein the optical fiber comprises a plurality of gratings, and the breakpoint detection device is used to implement the steps in the breakpoint detection method for an optical fiber as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer-readable program, wherein when the program or instruction is executed by a processor, the steps in the optical fiber breakpoint detection method according to any one of claims 1 to 7 can be implemented.

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