Optical fiber link identification method, device, equipment and storage medium

Abstract

This invention provides a method, apparatus, device, and storage medium for identifying optical fiber links. The method includes: acquiring multiple optical fiber links; setting at least one set of optical tags in each optical fiber link, with each set of optical tags including at least three optical tags spaced apart; transmitting optical signals to each optical fiber link for the same set of optical tags in each optical fiber link, and acquiring the reflection signals of each optical tag to the optical signals; performing beat frequency processing and photoelectric conversion processing on the reflection signals of every two optical tags to obtain the beat frequency signal of every two optical tags; determining the target signal corresponding to every two optical tags based on the beat frequency signal of every two optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags; and identifying each optical fiber link based on the detection position difference of every two optical tags. Using this invention can reduce the cost of lasers in the system.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensing technology, and in particular to a method, apparatus, device, and storage medium for identifying fiber optic links. Background Technology

[0002] Optical fiber is a common low-loss optical transmission medium with advantages such as resistance to electromagnetic interference, corrosion resistance, and long-distance transmission, making it convenient to send light, the information carrier, to distant locations for information sensing. Distributed optical fiber sensing utilizes the transmission characteristics of light in optical fibers, including Rayleigh scattering, Raman scattering, and Brillouin scattering, to achieve multi-point distributed sensing. Through various signal processing methods in the time and frequency domains, it can achieve real-time monitoring of the environment near the optical fiber. Therefore, the application of distributed optical fiber is becoming increasingly widespread. In technologies using optical fiber sensing, multiple optical fiber links typically exist, making the identification of these links particularly important.

[0003] In related technologies, taking distributed optical fiber sensing as an example, when identifying multiple optical fiber links in a distributed optical fiber, optical tags are generally set on the optical fiber links, and then the optical tags are identified by optical frequency domain reflectometer (OFDR) systems to distinguish different optical fiber links. When the OFDR system identifies the optical tags, it generally uses lasers generated by lasers and distinguishes different optical fiber links by interfering the local oscillator light and the probe light.

[0004] However, the above-mentioned technologies generally measure the absolute distance between the reflection point in the fiber optic link and the system, which requires that the reference light and the signal light be coherent. In order to achieve long-distance measurement and meet the requirements of the coherence length of the light source, the OFDR system requires the light source to have a very narrow linewidth, which will significantly increase the cost of the laser in the system. Summary of the Invention

[0005] This invention provides a fiber optic link identification method, apparatus, device, and storage medium to address the shortcomings of existing technologies that require high linewidth of the light source in the OFDR system when identifying fiber optic links, which significantly increases the cost of the laser in the system. The invention achieves identification of different fiber optic links by setting at least three optical tags at intervals in each fiber optic link and encoding them by different positions of the optical tags in the fiber optic link, while combining the beat frequency signal between any two optical tags, without requiring a very narrow linewidth of the light source in the OFDR system, thus reducing the cost of the laser in the system.

[0006] This invention provides a method for identifying optical fiber links, comprising: Acquire multiple fiber optic links; each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart; For the same set of optical tags in each optical fiber link, optical signals are transmitted to each optical fiber link separately, and the reflected signals after the optical signals are reflected by each optical tag in each optical fiber link are acquired; the same set of optical tags in each optical fiber link corresponds to the same target laser; The reflected signals of every two optical tags are processed by beat frequency processing and photoelectric conversion to obtain the beat frequency signal of every two optical tags. Based on the beat frequency signal of each pair of optical tags, the target signal corresponding to each pair of optical tags is determined; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. The detection position difference between the two optical tags corresponding to each target signal is determined based on each target signal, and each optical fiber link is identified based on the detection position difference between each pair of optical tags.

[0007] According to a fiber optic link identification method provided by the present invention, the identification of each fiber optic link based on the detection position difference between every two optical tags includes: Obtain the frequency corresponding to each target signal; Each fiber optic link is identified based on the difference in detection position between every two optical tags and / or the frequency of each target signal.

[0008] According to a fiber optic link identification method provided by the present invention, the identification of each fiber optic link based on the detection position difference between every two optical tags and / or the frequency of each target signal includes: Obtain the preset positions of at least three optical tags spaced apart in each optical fiber link, and determine the preset position difference between every two optical tags in each optical fiber link based on the preset position of each optical tag in each optical fiber link; Obtain multiple preset frequencies corresponding to each optical fiber link; the number of these preset frequencies is related to the number of optical tags set in the optical fiber link. Each optical fiber link is identified based on the detection position difference between every two optical tags and the preset position difference between every two optical tags in each optical fiber link, and / or the frequency of each target signal and multiple preset frequencies corresponding to each optical fiber link.

[0009] According to a fiber optic link identification method provided by the present invention, the identification of each fiber optic link is performed based on the detection position difference between every two optical tags and the preset position difference between every two optical tags in each fiber optic link, and / or the frequency of each target signal and multiple preset frequencies corresponding to each fiber optic link, including: For each fiber optic link, the detection position difference between every two optical tags corresponding to the fiber optic link is matched with the preset position difference between every two optical tags in each fiber optic link. The frequency of each target signal corresponding to the optical fiber link is matched with multiple preset frequencies corresponding to each optical fiber link; If multiple detection position differences corresponding to the optical fiber link are successfully matched with multiple first preset position differences corresponding to the first optical fiber link, and / or if multiple frequencies corresponding to the optical fiber link are successfully matched with multiple preset frequencies corresponding to the first optical fiber link, then the optical fiber link is determined to be the first optical fiber link; the first optical fiber link is any one of the optical fiber links.

[0010] According to a fiber optic link identification method provided by the present invention, at least one set of optical tags is provided in each fiber optic link, including: multiple sets of optical tags are provided in each fiber optic link; The number of optical tags set in each optical fiber link is the same. The center wavelength of the reflection spectrum of each optical tag in the optical fiber link is matched with the center wavelength of a target laser. Moreover, the center wavelength of the reflection spectrum of each optical tag in the optical fiber link is different.

[0011] According to a fiber optic link identification method provided by the present invention, the above-mentioned transmission of optical signals to each fiber optic link includes: Laser signals are transmitted to each fiber optic link via the target laser; the coherence length corresponding to the instantaneous linewidth of the output light source of the target laser is much greater than the length interval between any two optical tags in each fiber optic link.

[0012] According to a fiber optic link identification method provided by the present invention, the acquisition of multiple fiber optic links includes: Acquire at least one set of optical tags and multiple initial fiber optic links; each set of optical tags includes at least three optical tags with the same center wavelength of the reflection spectrum; For each initial fiber optic link, each set of optical tags is placed at a different position in the initial fiber optic link to determine the corresponding fiber optic link.

[0013] The present invention also provides an optical fiber link identification device, comprising the following modules: The fiber optic link acquisition module is used to acquire multiple fiber optic links; each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart; The detection module is used to transmit optical signals to each optical fiber link for the same set of optical tags in each optical fiber link, and to acquire the reflected signals after each optical tag in each optical fiber link reflects the optical signals; the same set of optical tags in each optical fiber link corresponds to the same target laser. The beat frequency processing module is used to perform beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags. The determination module is used to filter the beat frequency signal of every two optical tags to determine the target signal corresponding to each pair of optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. The fiber optic link identification module is used to determine the detection position difference between two optical tags corresponding to each target signal based on each target signal, and to identify each fiber optic link based on the detection position difference between each pair of optical tags.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the fiber optic link identification method as described above.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the fiber optic link identification method as described above.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the fiber optic link identification methods described above.

[0017] The fiber optic link identification method, apparatus, device, and storage medium provided by this invention acquire multiple fiber optic links, transmit optical signals to each fiber optic link for the same set of optical tags in each fiber optic link, acquire the reflected signals after each optical tag in each fiber optic link reflects the optical signals, perform beat frequency and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags, filter the beat frequency signal of every two optical tags to determine the target signal corresponding to every two optical tags, determine the detection position difference between the two optical tags corresponding to each target signal based on each target signal, and identify each fiber optic link based on the detection position difference between every two optical tags; wherein, each fiber optic link is provided with at least one set of optical tags, each set of optical tags includes at least three optical tags arranged at intervals, the same set of optical tags in each fiber optic link corresponds to the same target laser, and the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. In this method, since at least three optical tags can be spaced apart in each optical fiber link to encode the different positions of the optical tags in the optical fiber link, and the different optical fiber links can be identified by combining the beat frequency signal between any two optical tags, without requiring the OFDR system light source to have a very narrow linewidth, the cost of the laser in the system can be reduced. At the same time, by determining the position difference of the optical tags in the optical fiber link through the target signal of the optical tags to identify the optical fiber link, the influence of the reflection signal of the reflection point of the optical fiber link without optical tags can also be eliminated, reducing noise interference in the optical fiber link. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the optical tag detection system provided by the present invention.

[0020] Figure 2 This is one of the flowcharts illustrating the fiber optic link identification method provided by the present invention.

[0021] Figure 3 This is the second flowchart of the fiber optic link identification method provided by the present invention.

[0022] Figure 4 This is a schematic diagram showing the placement of a set of optical tags in an optical fiber link provided by the present invention. Figure 5This is a distance intensity map corresponding to a set of optical tags in an optical fiber link provided by the present invention.

[0023] Figure 6 This is a schematic diagram of the placement of two sets of optical tags in the optical fiber link provided by the present invention.

[0024] Figure 7 This is a distance intensity map corresponding to each of the two sets of optical tags in the optical fiber link provided by the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the fiber optic link identification device provided by the present invention.

[0026] Figure 9 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] Distributed fiber optic sensing is increasingly being applied in a growing number of engineering fields, such as power cable temperature measurement and pipeline safety inspection. In the field of distributed fiber optic sensing, Optical Frequency Domain Reflectometry (OFDR) technology offers advantages such as small size, high sensitivity, and high spatial resolution. It can achieve high-precision real-time measurement of changes in the external environment, such as temperature, stress, and shape, along fiber optic lines, making it highly valuable for research and application. The composition and workflow of an OFDR system can be divided into three steps. First, a tunable laser emits a continuous light wave whose frequency scans linearly with time; the frequency range determines the system's spatial resolution. Second, using an optical interferometer structure, the laser beam is split into two paths: the reference beam directly enters the receiver, and the signal beam is injected into the fiber under test. The signal beam returns via scattering / reflection points in the fiber, and the returning signal beam interferes with the reference beam in a combiner, forming an interference signal (also called a beat frequency signal). Third, the interference signal is converted into an electrical signal, the frequency of which is related to the position of the scattering points in the fiber. Then, frequency domain analysis is performed on the electrical signal, converting the frequency domain signal into distance domain information to achieve spatial positioning.

[0029] In the field of fiber optic sensing, multiple fiber optic links are typically involved. To monitor the fiber optic system effectively in real time, it is generally necessary to identify each fiber optic link. This identification requires placing optical tags on the fiber optic lines and using appropriate detection methods to identify the tags. Regarding optical tags, detection methods utilizing the inherent scattering effects of optical fibers (Rayleigh scattering, Raman scattering, Brillouin scattering, etc.) generally produce scattered signals with low intensity, thus placing high demands on the detection system. Furthermore, the complex nonlinear effects, such as Brillouin scattering, are not conducive to the practical application of fiber optic link identification.

[0030] Therefore, fiber optic gratings (FBGs) have become a common method for implementing optical tags. FBGs typically achieve strong light reflection at specific locations within a specific frequency range in an optical fiber. Different FBGs can reflect different wavelengths of light, and they also exhibit different responses to environmental factors such as temperature and stress. This facilitates the detection of optical tags using various distributed sensing technologies, and wavelength encoding can be achieved by setting different center wavelengths, increasing the encoding space. Common methods for detecting FBG-based optical tags include OTDR and OFDR. OTDRs include single-wavelength optical time-domain reflectometry (SOTDR) and tunable ODR. OTDR is a relatively simple detection system, but its spatial resolution and signal-to-noise ratio (SNR) are mutually constrained. Improving spatial resolution requires shortening the pulse width, which reduces the power of the detected signal and degrades the SNR. Therefore, OTDR detection of fiber Bragg gratings has limited spatial resolution, making spatial location coding difficult. Enhancing the coding space often relies on multi-wavelength OTDR arrays to detect fiber Bragg gratings with different reflection wavelengths, but the coding space is also limited. Furthermore, this method suffers from the problem that the reflected signal of a single fiber Bragg grating is easily confused with other non-ideal discrete reflection points in the fiber optic link, making differentiation difficult. Additionally, when detecting fiber Bragg gratings with OFDR, traditional OFDRs use interference between the local intrinsic reference light and the reflected signal light in the optical path to generate a beat frequency signal. This system measures the absolute distance between the reflection point in the fiber optic link and the system, requiring the reference light and signal light to be coherent. Therefore, to achieve long-distance measurement and meet the coherence length requirements of the light source, OFDR systems require very narrow linewidths, significantly increasing the cost of the laser in the system and making it difficult to apply in practical scenarios.

[0031] Based on this, embodiments of the present invention provide a fiber optic link identification method, apparatus, device, and storage medium, which can solve the above-mentioned technical problems.

[0032] The application scenarios of the embodiments of the present invention will be described below, see below. Figure 1 The schematic diagram of the optical tag detection system shown can also be called an optical tag inspection system. This system includes a tunable light source 101, a fiber optic circulator / coupler 102, an optical tag 103, a photodetector 104, an electrical signal processing module 105, and an analysis module 106. The tunable light source 101 is a laser that generates a frequency-modulated continuous wave. After passing through the fiber optic circulator / coupler 102, the signal light is reflected by the optical tag 103 in the fiber optic link. The reflected light wave / signal is detected by the photodetector 104 and converted into an electrical signal. The electrical signal is then processed by the electrical signal processing module 105, and frequency domain analysis and / or time domain analysis are performed in the analysis module 106. Utilizing the tuning characteristics of the tunable light source 101, the position information of the optical tag 103 within the optical tag is inferred, reflecting the encoding characteristics of the optical tag 103.

[0033] It should be noted that the execution subject of the embodiments of the present invention can be an optical tag detection system, an optical fiber link identification device, or other systems or devices. No specific limitation is made here. The following embodiments will use an optical tag detection system as the execution subject for illustration.

[0034] Figure 2 This is one of the flowcharts illustrating the fiber optic link identification method provided by the present invention, such as... Figure 2 As shown, the method includes the following steps: Step 202: Obtain multiple fiber optic links; each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart.

[0035] The optical tag detection system can include multiple optical fibers, each of which can be a single-mode fiber. Each fiber corresponds to a fiber optic link and is connected to a fiber optic circulator / fiber optic coupler. The laser signal generated by the laser can be transmitted to the fiber optic link through the fiber optic circulator / fiber optic coupler.

[0036] In this embodiment, one or more sets of optical tags are set in the optical fiber of each optical fiber link. Each set of optical tags includes three or more optical tags set at intervals. The interval setting means that each optical tag in the same set is set at a different position on the corresponding optical fiber, so that the optical fiber link can be identified by encoding the optical tags set at different positions in the optical fiber link.

[0037] The methods for obtaining multiple fiber optic links here can optionally include: Acquire at least one set of optical tags and multiple initial fiber optic links; each set of optical tags includes at least three optical tags with the same center wavelength of the reflection spectrum; For each initial fiber optic link, each set of optical tags is placed at a different position in the initial fiber optic link to determine the corresponding fiber optic link.

[0038] First, multiple initial fiber optic links connected to fiber optic circulators / couplers can be identified. These initial links do not have optical tags on their fibers. Then, one or more sets of optical tags can be acquired, each set containing three or more tags with the same center wavelength of the reflection spectrum. This allows the fiber optic links to be encoded and identified using the same set of tags. After obtaining one or more sets of tags, each set can be placed at different locations within each initial fiber optic link. This identifies the initial fiber optic link with the tags, denoted as the fiber optic link corresponding to the initial fiber optic link. The locations of the same set of optical tags in different fiber optic links are not entirely the same, allowing for spatial multiplexing by identifying different fiber optic links based on the different spatial positions of the same set of tags. Furthermore, the locations of each set of optical tags within the same initial fiber optic link are not entirely the same, and the center wavelengths of the reflection spectra corresponding to different sets of optical tags are different, as are the laser wavelengths reflected by different optical tags. This allows for the identification of fiber optic links corresponding to various laser wavelengths using different sets of optical tags, achieving wavelength division multiplexing.

[0039] Furthermore, the aforementioned optical tags can be weakly reflective fiber gratings (FFRs). FFRs within the same group share the same center wavelength and bandwidth of their reflection spectrum. The different FFR locations within each fiber optic link can serve as the encoding for the optical tags. For example, the center wavelength of the FFR's reflection spectrum can be selected within the range of 1200nm-1650nm, the bandwidth of the reflection spectrum can be selected between 0.2nm-20nm, and the reflectivity of the FFR can be selected between 0.1% and 50%.

[0040] Furthermore, the aforementioned fiber optic links may also include fiber optic links without optical tags. A fiber optic link without an optical tag can be identified by the fact that a photodetector does not receive a reflected signal within a set time after transmitting an optical signal to it.

[0041] Step 204: For the same set of optical tags in each optical fiber link, transmit optical signals to each optical fiber link respectively, and obtain the reflected signals after each optical tag in each optical fiber link reflects the optical signals.

[0042] For each fiber optic link, an optical signal can be transmitted to each link first. The optical tags in each link can then reflect this signal to obtain a reflected signal. The method for transmitting the optical signal to each fiber optic link can be through a beam splitter, a laser transmitter, or other methods.

[0043] Taking the transmission of laser signals to various fiber optic links via a laser as an example, for each fiber optic link containing the same set of optical tags, a target laser of a specific wavelength corresponding to that set of optical tags can be determined first. The center wavelength of this target laser matches the center wavelength of the reflection spectrum of that set of optical tags (e.g., they are the same, for example, both are 1552.0 nm), and the wavelength tuning range of the laser signal output by the target laser is within the reflection spectrum bandwidth of that set of optical tags. This target laser can be a narrow-bandwidth laser / laser source, which can be a continuously tunable laser that can output a narrow-linewidth laser with periodically linearly tuned wavelengths. After determining the target laser corresponding to each set of optical tags, for each set of optical tags, the target laser corresponding to that set of optical tags can be used to detect that set of optical tags. Specifically, the target laser corresponding to that set of optical tags can be used to transmit laser signals to each fiber optic link separately, and the center wavelength of the laser signal matches the center wavelength of the reflection spectrum of that set of optical tags. After the target laser emits a laser signal of a specific wavelength into each fiber optic link, a set of optical tags in each fiber optic link whose center wavelength of the reflection spectrum matches that specific wavelength will reflect the laser signal, forming a reflected signal.

[0044] Furthermore, if traditional OFDR detection technology is used to detect optical tags, the local oscillator signal of the OFDR detection system must be coherent with the reflected signal in the fiber optic link. When the optical tag is far from the detection system in the fiber optic link, the laser linewidth in the detection system needs to be very narrow. For example, to detect an optical tag 10 kilometers away, the light source linewidth of a traditional OFDR detection system needs to be much less than 10 kHz. The required linewidth becomes even narrower at greater distances, significantly increasing the requirements for the light source and raising the cost of the detection system. However, when using the Selfie-based detection and detection system of this invention to detect the optical tags proposed in this invention, there is a positional difference between any two optical tags in the same group set in each fiber optic link. This positional difference can also be referred to as the length interval between the two optical tags. Optionally, the above-mentioned transmission of optical signals to each fiber optic link includes: transmitting laser signals to each fiber optic link through a target laser; the coherence length corresponding to the instantaneous linewidth of the target laser's output light source is much larger than the length interval between any two optical tags in each fiber optic link. In other words, the laser signal output by the target laser for each group of optical tags is emitted into each optical fiber link. The reflected signal is obtained after being reflected by the same group of optical tags in the optical fiber link. Here, the coherence length corresponding to the instantaneous linewidth of the output laser signal needs to be greater than the length interval between any two optical tags in the optical fiber link. This makes it possible to use a laser light source with a wider linewidth to realize optical tag detection / inspection, which will greatly reduce the cost of the optical tag detection system and the cost of the laser.

[0045] Step 206: Perform beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags.

[0046] In this step, the reflected signal of each optical tag in each fiber optic link enters the photodetector through a fiber optic circulator or fiber optic coupler. During the detection of the reflected signal by the photodetector, the reflected signals of any two optical tags will undergo beat frequency processing. After beat frequency processing, photoelectric conversion processing is performed to obtain the beat frequency signal of every two optical tags. This beat frequency signal is an electrical signal, specifically a photocurrent signal. Alternatively, it can specifically involve the self-beat frequency of the reflected signals of any two optical tags in each fiber optic link, that is, the beat frequency of the reflected signals of all optical tags in the same fiber optic link.

[0047] The following describes the specific process of beat frequency processing and photoelectric conversion processing of the reflected signals from any two optical tags.

[0048] The instantaneous frequency of a narrow-linewidth laser with linearly tuned wavelength generated by a continuously tuned narrow-linewidth laser source / laser within a single repetition cycle is: ; in, f 0 represents the initial frequency of the laser sweep. γ This represents the sweep slope of the laser's sweep frequency as a function of time. t For time, the laser source / laser outputs a laser signal. E emit ( t This can be represented as: ; in, E 0 represents the amplitude of the output laser signal. This represents the initial phase of the output laser signal.

[0049] The laser signal output from the target laser is incident on each fiber optic link through a fiber optic circulator or fiber optic coupler. Upon encountering an optical tag in each fiber optic link, it is emitted, and the reflected signal returns to the fiber optic circulator or fiber optic coupler. The reflected signal can be represented as: ; in, This represents the phase term accumulated by the laser signal in intermediate optical paths such as fiber optic circulators or fiber optic couplers, and is a constant. R z The reflectance coefficient of the optical tag is represented by z; z represents the position of the optical tag in the fiber optic link (where z=0 is assumed at the port of the fiber optic circulator or fiber optic coupler). The delay in the transmission of the laser signal from the incident fiber optic link to the fiber optic circulator or coupler after reflection from the optical tag can be expressed by the formula: Indicates; among which c Represents the speed of light in a vacuum. n g The group refractive index represents the propagation of light waves in an optical fiber.

[0050] Furthermore, each group of optical tags in each fiber optic link includes K optical tags (K ≥ 3). The reflected light waves generated by these optical tags are detected by a photodetector after passing through a fiber optic circulator or fiber optic coupler. Since the instantaneous linewidth of the laser source output light of the target laser satisfies that its coherence length is much greater than the length interval between any two optical tags, the reflected signals generated by these different optical tags are coherent with each other. The beat frequency signal after photoelectric conversion of the reflected signals of any two optical tags can be expressed as: ; in, I ( t) represents the beat frequency signal after photoelectric conversion of the reflected signals of any two optical tags; R i and R j They represent the first i The first optical tag and the first j The reflectance coefficient of each optical tag; τ i and τ j They represent the first i The first optical tag and the first j The delay of each optical tag; O ( t It contains DC and high-frequency terms, which can be removed through DC component removal and low-pass filtering during data processing. Indicates the relationship with the first i The first optical tag and the first j The position-dependent constant phase term of each optical tag.

[0051] Step 208: Determine the target signal corresponding to each pair of optical tags based on the beat frequency signal of each pair of optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal.

[0052] After obtaining the beat frequency signal of every two optical tags, the beat frequency signal can be digitally sampled and processed by the digital sampling and data processing module (i.e., the electrical signal processing module). This data processing includes filtering and other processes. The delay is represented by the position of the optical tag, thus obtaining a series of sinusoidal signals related to the position of the optical tag. S ( t The target signal, denoted as ), is represented as follows: ; in, z i and z j They represent the first i The first optical tag and the first j The location of each optical tag in the fiber optic link, z i - z j ) indicates the first i The first optical tag and the first j The positional difference between the optical tags can be denoted as the detection position difference.

[0053] The frequencies of these sinusoidal signals can be obtained through digital spectrum analysis, and the frequency of each term in these sinusoidal signals is proportional to the position difference between the corresponding two optical tags. The different positional designs of these optical tags can be distinguished by frequency analysis of the above sinusoidal signals. That is, frequency domain analysis can be performed on the above sinusoidal signals / target signals to obtain the frequency corresponding to each sinusoidal signal / target signal. Then, the time interval can be calculated from the frequency changes of the signals, and the detection position difference between the two optical tags can be calculated from the time interval.

[0054] Step 210: Determine the detection position difference between the two optical tags corresponding to each target signal based on each target signal, and identify each optical fiber link based on the detection position difference between each pair of optical tags.

[0055] In this step, after obtaining the target signal between any two optical tags in each fiber optic link, the position difference / length interval between the two optical tags corresponding to each signal can be determined by analyzing the frequency of each target signal. This involves performing frequency domain analysis on the target signals to obtain the frequency corresponding to each target signal, then calculating the time interval based on the frequency changes, and finally calculating the detection position difference between the two optical tags based on the time interval. The detection position difference between each pair of optical tags can then be matched with prior knowledge to distinguish the specific fiber optic link corresponding to the optical tag, thereby identifying each fiber optic line. This prior knowledge may include pre-set positions between any two optical tags in each fiber optic link, or it may include frequency requirements for the reflection peaks corresponding to the target signals of any two optical tags.

[0056] Therefore, the location design of different optical tags can be used as the encoding of the optical tags. If the signal obtained by detection and analysis includes the sinusoidal signal frequency component corresponding to the optical tag encoding, it can be identified that there is an optical tag with that encoding in the optical fiber link, thereby identifying the optical tag on the optical fiber link and thus identifying the optical fiber link.

[0057] Furthermore, when setting the same set of optical tags in various fiber optic links, the position between the two optical tags at both ends of the fiber can be fixed, and the position of the optical tag in the middle can be adjusted. This allows for encoding by controlling the position of the middle optical tag, thus identifying different fiber optic links and the optical tags within them. For example, suppose three optical tags A, C, and B are sequentially spaced in an optical link, where the length between A and B is fixed. Encoding is performed by controlling the position of C between A and B to identify the fiber optic link. Simultaneously, the distance between A and B can also be used for encoding. It can be understood that multiple optical tags are pre-set at different locations on a fiber optic link. The positional difference between any two optical tags on this link can serve as prior knowledge for subsequent position matching, i.e., as a preset positional difference for subsequent position matching, or as prior knowledge for the relationship of reflection peaks in subsequent frequency domain analysis, thereby facilitating the differentiation of different fiber optic links.

[0058] In this embodiment, multiple fiber optic links are acquired. For the same set of optical tags in each fiber optic link, a target laser emits laser signals into each fiber optic link. The reflected signals of each optical tag in each fiber optic link after reflecting the laser signals are acquired. The reflected signals of every two optical tags are processed by beat frequency and photoelectric conversion to obtain the beat frequency signal of every two optical tags. The beat frequency signal of every two optical tags is filtered to determine the target signal corresponding to every two optical tags. The detection position difference between the two optical tags corresponding to each target signal is determined based on each target signal. Each fiber optic link is identified based on the detection position difference between every two optical tags. Each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart. The same set of optical tags in each fiber optic link corresponds to the same target laser. The frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. In this method, since at least three optical tags can be spaced apart in each optical fiber link to encode the different positions of the optical tags in the optical fiber link, and the different optical fiber links can be identified by combining the beat frequency signal between any two optical tags, without requiring the OFDR system light source to have a very narrow linewidth, the cost of the laser in the system can be reduced. At the same time, by determining the position difference of the optical tags in the optical fiber link through the target signal of the optical tags to identify the optical fiber link, the influence of the reflection signal of the reflection point of the optical fiber link without optical tags can also be eliminated, reducing noise interference in the optical fiber link.

[0059] The following examples illustrate the process of identifying fiber optic links by combining the positional difference between every two optical tags with the frequency.

[0060] Figure 3This is the second flowchart illustrating the fiber optic link identification method provided by the present invention, as shown below. Figure 3 As shown, step 210 above identifies each fiber optic link based on the detection position difference between every two optical tags, and may include the following steps: Step 302: Obtain the frequency corresponding to each target signal.

[0061] After obtaining the target signal between every two optical tags, each target signal can be input into a digital spectrum analyzer for frequency domain analysis to obtain the frequency corresponding to each target signal.

[0062] Step 304: Identify each fiber optic link based on the difference in detection position between every two optical tags and / or the frequency of each target signal.

[0063] In this step, after obtaining the frequency corresponding to each target signal and the detection position difference between each pair of optical tags, the detection position difference between each pair of optical tags can be matched with prior knowledge, and / or the frequency of each target signal can be matched with prior knowledge. Based on any one of these two matching results or a combination of the two matching results, the specific optical fiber link corresponding to the optical tag can be distinguished, thereby identifying each optical fiber line.

[0064] Alternatively, the identification of each fiber optic link based on the detection position difference between every two optical tags and / or the frequency of each target signal may include the following steps: Step A1: Obtain the preset positions of at least three optical tags spaced apart in each optical fiber link, and determine the preset position difference between every two optical tags in each optical fiber link based on the preset position of each optical tag in each optical fiber link.

[0065] When pre-setting multiple optical tags for each group of optical tags in each fiber optic link, after setting the position of each optical tag in the fiber, the preset positions corresponding to each group of optical tags in each fiber / fiber optic link can be recorded. Simultaneously, the position difference between the preset positions of any two optical tags in each group can be calculated and recorded as the preset position difference between the two pairs of optical tags. Alternatively, the magnitude relationship between the preset position differences between the two pairs of optical tags can also be recorded. Furthermore, when recording the preset positions of the optical tags and the preset position differences between the two pairs of optical tags, the identifier of the optical tag corresponding to each preset position and the identifiers of the two optical tags corresponding to each preset position difference can be recorded simultaneously. Additionally, the multiple preset position differences corresponding to each fiber optic link can be treated as a single preset position difference.

[0066] Step A2: Obtain multiple preset frequencies corresponding to each optical fiber link; the number of these preset frequencies is related to the number of optical tags set in the optical fiber link.

[0067] When setting multiple optical tags for each group of optical tags in each fiber optic link, the frequency corresponding to the reflection peak of the target signal between every two optical tags can also be preset and recorded as a preset frequency. Furthermore, when recording the preset frequency of the reflection peak of the target signal between pairs of optical tags, the identifiers of the two optical tags corresponding to each preset frequency can be recorded simultaneously; and the multiple preset frequencies corresponding to each fiber optic link can be treated as a group of preset frequencies.

[0068] In addition, the number of preset frequencies set here is related to the number of optical tags set in the fiber optic link. Specifically, it can be the same as the number of pairs of optical tags. For example, if there are three optical tags in each fiber optic link and the number of pairs of the three optical tags is 3, then the number of preset frequencies is 3.

[0069] Step A3: Identify each optical fiber link based on the detection position difference between every two optical tags and the preset position difference between every two optical tags in each optical fiber link, and / or the frequency of each target signal and the multiple preset frequencies corresponding to each optical fiber link.

[0070] In this process, after obtaining the preset position difference between every two optical tags in each optical fiber link and the multiple preset frequencies corresponding to each optical fiber link, this information can be saved as prior knowledge and can be directly obtained and used in subsequent applications.

[0071] Optionally, step A3 may include: For each fiber optic link, the detection position difference between every two optical tags corresponding to the fiber optic link is matched with the preset position difference between every two optical tags in each fiber optic link. The frequency of each target signal corresponding to the optical fiber link is matched with multiple preset frequencies corresponding to each optical fiber link; If multiple detection position differences corresponding to the optical fiber link are successfully matched with multiple first preset position differences corresponding to the first optical fiber link, and / or if multiple frequencies corresponding to the optical fiber link are successfully matched with multiple preset frequencies corresponding to the first optical fiber link, then the optical fiber link is determined to be the first optical fiber link; the first optical fiber link is any one of the optical fiber links.

[0072] In this process, the photodetector detects one fiber optic link at a time, acquiring multiple beat frequency signals and multiple target signals corresponding to that link, and thus obtaining multiple detection position differences and multiple frequencies for that fiber optic link. Then, for that fiber optic link, the multiple detection position differences corresponding to the multiple optical tags detected in that link are compared one by one with each set of preset position differences for each fiber optic link. At least one set of preset position differences that matches all of these detection position differences is found. Simultaneously, considering the magnitude relationship between the preset position differences of each pair of optical tags in each fiber optic link, a set of preset position differences that satisfies the magnitude relationship is determined from the previously found at least one set. Then, based on this set of preset position differences, the corresponding fiber optic link is obtained, i.e., a fiber optic link is obtained, and this fiber optic link can be used as the first fiber optic link.

[0073] Alternatively, the multiple frequencies corresponding to the current fiber optic link can be compared one by one with each set of preset frequencies corresponding to other fiber optic links. A set of preset frequencies matching all of these frequencies can then be found. Based on this set of preset frequencies, a corresponding fiber optic link can be obtained, thus creating a single fiber optic link, which can then be used as the first fiber optic link. It is understood that the frequencies of the multiple target signals corresponding to each fiber optic link can be the frequencies corresponding to the reflection peaks of each target signal.

[0074] It should be noted that when identifying the same fiber optic link through position matching and frequency matching, the results of position matching of multiple detection position differences corresponding to the fiber optic link and the results of frequency matching of multiple frequencies corresponding to the fiber optic link are usually consistent, that is, the fiber optic link identified by both is the same fiber optic link.

[0075] In this embodiment, fiber optic links are identified by multiple detection position differences and / or multiple frequencies for each fiber optic link, which improves the accuracy of fiber optic link identification. Furthermore, each fiber optic link is comprehensively identified by combining multiple detection position differences with preset position differences and / or multiple frequencies with preset frequencies for each fiber optic link. This combination of prior knowledge allows for rapid and accurate identification of each link, improving the accuracy and efficiency of fiber optic link and optical tag identification. Moreover, when multiple detection position differences of a fiber optic link successfully match the prior knowledge of a particular fiber optic link, and / or multiple frequencies also successfully match the prior knowledge of that fiber optic link, the fiber optic link can be definitively identified. This further improves the accuracy and efficiency of fiber optic link and optical tag identification. Simultaneously, by identifying the frequency components of the target signal of a specific coded optical tag, the influence of reflected signals from non-optical tag fiber optic link reflection points can be eliminated, reducing noise interference in the fiber optic link.

[0076] The following examples illustrate the process of setting multiple sets of optical tags in an optical fiber link to achieve spatial division multiplexing and wavelength division multiplexing.

[0077] In one embodiment, in step 202 above, at least one set of optical tags is set in each optical fiber link, including: multiple sets of optical tags are set in each optical fiber link; The number of optical tags set in each optical fiber link is the same. The center wavelength of the reflection spectrum of each optical tag in the optical fiber link is matched with the center wavelength of a target laser. Moreover, the center wavelength of the reflection spectrum of each optical tag in the optical fiber link is different.

[0078] In the fiber optic link detection system, multiple sets of optical tags can be set in each fiber optic link. Each set of optical tags corresponds to the same center wavelength and bandwidth of the reflection spectrum. The center wavelength and bandwidth of the reflection spectrum corresponding to different sets of optical tags are different. Moreover, the center wavelength of the reflection spectrum of each set of optical tags is matched with the center wavelength of a target laser. In this way, the system can encode at the center wavelength of different target lasers, thereby detecting through optical tag sets of different bands and lasers of different bands, achieving the purpose of combining spatial division multiplexing and wavelength division multiplexing, and greatly improving the encoding space of optical tags.

[0079] In other words, optical tags with different center wavelengths of the aforementioned reflection spectrum can be detected separately by narrow-linewidth lasers / laser sources with continuously tuned wavelengths. If an optical tag of a specific wavelength can encode m different optical tag positions, then by fabricating n groups of different fiber optic tags with different center wavelengths of the reflection spectrum on the same fiber, the number of optical tag codes that can be supported is m. nBy combining spatial division multiplexing (SDM) and wavelength division multiplexing (WDM), the coding space of optical tags can be significantly increased. For example, assuming the position coding feature of laser A is 123 and the position coding feature of laser B is ABC, there are nine possible combinations: 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C. This demonstrates that combining SDM and WDM can greatly enhance the coding space of optical tags.

[0080] In this embodiment, by setting multiple sets of optical tags in the optical fiber link, spatial division multiplexing and wavelength division multiplexing can be realized, thereby increasing the coding space of the optical tags in the optical fiber link.

[0081] The fiber optic link identification process of this invention will be described below using scenarios of setting one set of optical tags in a single fiber optic link and setting multiple sets of optical tags.

[0082] Scenario 1: A set of optical tags is set up in the fiber optic link. This set of optical tags includes three weakly reflective fiber Bragg gratings.

[0083] See Figure 4 The diagram shows the placement of a set of optical tags in a fiber optic link. In this embodiment, three weakly reflective fiber gratings (FGGs), designated A, B, and C, are placed in the fiber optic link. The spacing / positional differences between the three FGGs are: AC = 0.3m, CB = 0.7m, and AB = 1.0m, respectively. The center wavelength of the reflection spectrum of the three FGGs is 1550.0nm, the bandwidth is 1nm, and the reflectivity is 1%. The target laser used in this embodiment has a linewidth of 3kHz, a center wavelength of 1550.0nm, and is designed to perform frequency scanning at a repetition frequency of 100Hz, with a sweep range of 10GHz.

[0084] After the target laser emits a signal to the three weakly reflective fiber gratings in the fiber optic link, the three gratings generate reflected signals. A photodetector detects these reflected signals and performs beat frequency processing and photoelectric conversion to obtain the beat frequency signal between each pair of weakly reflective fiber gratings. Simultaneously, an electrical signal processing module filters these beat frequency signals to obtain the target signal corresponding to each pair of weakly reflective fiber gratings. The detection position difference between each pair of weakly reflective fiber gratings is then obtained using a spectrum analyzer. By finding reflection peaks in the spectrum analyzer that satisfy "AC+CB=AB" and whose target signal frequency is close to a pre-designed frequency, the optical tag in the fiber optic link can be identified, thus identifying the fiber optic link itself.

[0085] For example, see Figure 5 The diagram shows the distance-intensity map corresponding to a set of optical tags in the fiber optic link. The horizontal axis X represents distance / m, and the vertical axis Y represents relative intensity. Theoretically, through the above identification process, we should obtain... Figure 5 The range domain results show that the horizontal axes of the three reflection peaks correspond to the distances / positional differences of AC, CB, and AB, respectively, which are 0.3m, 0.7m, and 1m. These three reflection peaks represent the reflection peaks corresponding to the target signals between each pair of optical tags: AC, CB, and AB.

[0086] Scenario 2: Two sets of optical tags are set in the fiber optic link, and each set of optical tags includes three weak reflection fiber Bragg gratings.

[0087] See Figure 6 The diagram shows the placement of two sets of optical tags in the fiber optic link. In this embodiment, two sets of weak-reflection fiber Bragg gratings (FBGs) are set in the fiber optic link. Each set of FBGs includes three weak-reflection FBGs. The three FBGs in the first set are A1, B1, and C1, and the three FBGs in the second set are A2, B2, and C2. The spacing / position difference between two adjacent FBGs is as follows: A1A2=0.2m, A2C1=0.1m, C1C2=0.3m, C2B1=0.4m, and B1B2=0.2m. The center wavelength of the reflection spectrum of the three FBGs in the first set is 1550.0nm, the bandwidth is 1nm, and the reflectivity is 1%. The center wavelength of the reflection spectrum of the three FBGs in the second set is 1552.0nm, the bandwidth is 1nm, and the reflectivity is 1%. In this embodiment, target laser A (hereinafter referred to as laser A) and target laser B (hereinafter referred to as laser B) are used to detect two sets of weakly reflective fiber Bragg gratings, respectively. Laser A has a linewidth of 3 kHz and a center wavelength of 1550.0 nm, and is designed to perform frequency scanning at a repetition frequency of 100 Hz, with a sweep range of 10 GHz. Laser B has a linewidth of 3 kHz and a center wavelength of 1552.0 nm, and is designed to perform frequency scanning at a repetition frequency of 100 Hz, with a sweep range of 10 GHz.

[0088] After laser A transmits a signal to the three weakly reflective fiber gratings in the first group of the fiber optic link, the three gratings will generate reflected signals. A photodetector will detect these reflected signals and perform beat frequency processing and photoelectric conversion to obtain the beat frequency signal between every two weakly reflective fiber gratings in the first group. Simultaneously, the electrical signal processing module can filter the beat frequency signal to obtain the target signal corresponding to each pair of weakly reflective fiber gratings. Then, a spectrum analyzer will obtain the detection position difference between each pair of weakly reflective fiber gratings. By finding the reflection peak in the spectrum analyzer that satisfies "A1C1 + C1B1 = A1B1" and whose target signal frequency is close to the pre-designed frequency, the optical tag in the fiber optic link can be identified, thus identifying the fiber optic link itself.

[0089] Similarly, after laser B transmits a signal to the three weakly reflective fiber gratings in the second group of the fiber optic link, the three weakly reflective fiber gratings in the second group will generate reflected signals. The photodetector will detect the reflected signals and perform beat frequency processing and photoelectric conversion processing to obtain the beat frequency signal between every two weakly reflective fiber gratings in the second group. At the same time, the electrical signal processing module can filter the beat frequency signal to obtain the target signal corresponding to every two weakly reflective fiber gratings. Then, the detection position difference between every two weakly reflective fiber gratings can be obtained by the spectrum analyzer. By finding the reflection peak in the spectrum analyzer that satisfies "A2C2+C2B2=A2B2" and whose frequency is close to the pre-designed frequency range, the optical tag in the fiber optic link can be identified, and thus the fiber optic link can be identified.

[0090] For example, see Figure 7 The distance-intensity maps for the two sets of optical tags in the fiber optic link are shown below. The top map shows the distance-domain result for laser A, and the bottom map shows the distance-domain result for laser B. The horizontal axis represents distance / m, and the vertical axis represents relative intensity. Theoretically, through the above identification process, laser A should obtain... Figure 7 In the distance domain results above, the horizontal axes of the three reflection peaks correspond to the three intervals / position differences, A1C1, C1B1, and A1B1, respectively. Laser B should obtain... Figure 7 The distance domain results below show that the horizontal axes of the three reflection peaks correspond to the three intervals / positional differences, namely A2C2, C2B2, and A2B2.

[0091] In addition, it can be seen that the detection system can encode at 1550.0nm and 1552.0nm respectively, and has the ability to combine spatial division multiplexing and wavelength division multiplexing, which can greatly improve the coding space of optical tags.

[0092] As can be seen from the above embodiments, the optical tag proposed in this invention uses the positional design of three or more weak-reflection fiber Bragg gratings to form an encoding. The frequency components of each sinusoidal signal obtained by detecting the reflected signal based on self-timer detection and a detection system correspond to the positional difference between two weak-reflection fiber Bragg gratings. In each optical tag with a specific encoding, the weak-reflection fiber Bragg gratings have a specific positional design, and these frequency components also have a mathematical relationship determined by the spacing between the fiber Bragg gratings. In actual detection, there are often unexpected reflection points in the fiber optic link, generating various noise frequency components in the post-detection processed signal. Based on the specific mathematical relationship between the frequency components of the detection signal of a specific encoded optical tag, the relationship between the frequency components can be compared to determine which frequency components originate from the reflected signal of the optical tag, thereby eliminating the influence of noise frequency components.

[0093] The optical fiber link identification device provided by the present invention is described below. The optical fiber link identification device described below can be referred to in correspondence with the optical fiber link identification method described above.

[0094] Figure 8 This is a schematic diagram of the fiber optic link identification device provided by the present invention. See also: Figure 8 As shown, the device may include: The fiber optic link acquisition module 810 is used to acquire multiple fiber optic links; each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart; The detection module 820 is used to transmit optical signals to each optical fiber link for the same group of optical tags in each optical fiber link, and to acquire the reflected signals after each optical tag in each optical fiber link reflects the optical signals; the same group of optical tags in each optical fiber link corresponds to the same target laser. The beat frequency processing module 830 is used to perform beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags. The determination module 840 is used to determine the target signal corresponding to each pair of optical tags based on the beat frequency signal of each pair of optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. The fiber optic link identification module 850 is used to determine the detection position difference between two optical tags corresponding to each target signal based on each target signal, and to identify each fiber optic link based on the detection position difference between each pair of optical tags.

[0095] It should be noted that the apparatus provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0096] Figure 9 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 9As shown, the electronic device can be a single device in a photodetector and an electrical signal processing module. The electronic device may include: a processor 910, a communication interface 920, a memory 930, and a communication bus 940, wherein the processor 910, the communication interface 920, and the memory 930 communicate with each other through the communication bus 940. The processor 910 can call logic instructions in the memory 930 to execute a fiber optic link identification method, which includes: acquiring multiple fiber optic links; setting at least one set of optical tags in each fiber optic link, with each set of optical tags including at least three optical tags spaced apart; transmitting optical signals to each fiber optic link for the same set of optical tags in each fiber optic link, and acquiring the reflected signals after each optical tag in each fiber optic link reflects the optical signals; the same set of optical tags in each fiber optic link corresponds to the same target laser; performing beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags; determining the target signal corresponding to every two optical tags based on the beat frequency signal of every two optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal; determining the detection position difference between the two optical tags corresponding to each target signal based on each target signal, and identifying each fiber optic link based on the detection position difference between every two optical tags.

[0097] Furthermore, the logical instructions in the aforementioned memory 930 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the fiber optic link identification method provided by the above methods. The method includes: acquiring multiple fiber optic links; setting at least one set of optical tags in each fiber optic link, and each set of optical tags including at least three optical tags spaced apart; transmitting optical signals to each fiber optic link for the same set of optical tags in each fiber optic link, and acquiring the reflected signals after each optical tag in each fiber optic link reflects the optical signals; the same set of optical tags in each fiber optic link corresponds to the same target laser; performing beat frequency processing and photoelectric conversion processing on the reflected signals of each pair of optical tags to obtain the beat frequency signal of each pair of optical tags; determining the target signal corresponding to each pair of optical tags based on the beat frequency signal of each pair of optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal; determining the detection position difference between the two optical tags corresponding to each target signal based on each target signal, and identifying each fiber optic link based on the detection position difference between each pair of optical tags.

[0099] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the fiber optic link identification method provided by the above methods. The method includes: acquiring multiple fiber optic links; each fiber optic link having at least one set of optical tags, each set of optical tags including at least three optical tags spaced apart; transmitting optical signals to each fiber optic link for the same set of optical tags in each fiber optic link, and acquiring the reflected signals after each optical tag in each fiber optic link reflects the optical signals; the same set of optical tags in each fiber optic link corresponding to the same target laser; performing beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain a beat frequency signal for every two optical tags; determining a target signal corresponding to every two optical tags based on the beat frequency signals of every two optical tags; the frequency of the target signal being proportional to the detection position difference between the two optical tags corresponding to the target signal; determining the detection position difference between the two optical tags corresponding to each target signal based on each target signal, and identifying each fiber optic link based on the detection position difference between every two optical tags.

[0100] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0101] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying fiber optic links, characterized in that, include: Multiple fiber optic links are acquired; each fiber optic link is equipped with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart; For the same set of optical tags in each optical fiber link, laser signals are transmitted to each optical fiber link respectively, and the reflected signals after the optical signals are reflected by each optical tag in each optical fiber link are acquired; The reflected signals of every two optical tags are subjected to beat frequency processing and photoelectric conversion processing to obtain the beat frequency signal of every two optical tags; Based on the beat frequency signal of each pair of optical tags, a target signal corresponding to each pair of optical tags is determined; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. The detection position difference between the two optical tags corresponding to each target signal is determined based on each target signal, and each optical fiber link is identified based on the detection position difference between each pair of optical tags.

2. The fiber optic link identification method according to claim 1, characterized in that, The step of identifying each optical fiber link based on the detection position difference between every two optical tags includes: Obtain the frequency corresponding to each of the target signals; Each of the optical fiber links is identified based on the difference in detection position between every two optical tags and / or the frequency of each target signal.

3. The fiber optic link identification method according to claim 2, characterized in that, The step of identifying each of the optical fiber links based on the detection position difference between every two optical tags and / or the frequency of each target signal includes: Obtain the preset positions of at least three optical tags spaced apart in each optical fiber link, and determine the preset position difference between every two optical tags in each optical fiber link based on the preset positions of each optical tag in each optical fiber link; Obtain multiple preset frequencies corresponding to each optical fiber link; the number of the multiple preset frequencies is related to the number of optical tags set in the optical fiber link. Based on the detection position difference between every two optical tags and the preset position difference between every two optical tags in each optical fiber link, and / or the frequency of each target signal and multiple preset frequencies corresponding to each optical fiber link, each optical fiber link is identified.

4. The fiber optic link identification method according to claim 3, characterized in that, The step of identifying each optical fiber link based on the detection position difference between every two optical tags and the preset position difference between every two optical tags in each optical fiber link, and / or the frequency of each target signal and multiple preset frequencies corresponding to each optical fiber link, includes: For each optical fiber link, the detection position difference between every two optical tags corresponding to the optical fiber link is matched with the preset position difference between every two optical tags in each optical fiber link; The frequency of each target signal corresponding to the optical fiber link is matched with multiple preset frequencies corresponding to each optical fiber link; If the multiple detection position differences corresponding to the optical fiber link are all successfully matched with the multiple first preset position differences corresponding to the first optical fiber link, and / or if the multiple frequencies corresponding to the optical fiber link are all successfully matched with the multiple preset frequencies corresponding to the first optical fiber link, then the optical fiber link is determined to be the first optical fiber link; the first optical fiber link is any one of the optical fiber links.

5. The fiber optic link identification method according to any one of claims 1 to 4, characterized in that, Each of the aforementioned optical fiber links is provided with at least one set of optical tags, including: each of the aforementioned optical fiber links is provided with multiple sets of optical tags; The number of optical tags set in each optical fiber link is the same, and the center wavelength of the reflection spectrum of each group of optical tags in the optical fiber link is matched with the center wavelength of a target laser, and the center wavelength of the reflection spectrum of each group of optical tags in the optical fiber link is different.

6. The fiber optic link identification method according to any one of claims 1 to 4, characterized in that, The transmission of optical signals to each of the aforementioned optical fiber links includes: Laser signals are transmitted to each of the fiber optic links via a target laser; the coherence length corresponding to the instantaneous linewidth of the output light source of the target laser is much greater than the length interval between any two optical tags in each fiber optic link.

7. The fiber optic link identification method according to any one of claims 1 to 4, characterized in that, The acquisition of multiple fiber optic links includes: Acquire at least one set of optical tags and multiple initial fiber optic links; each set of optical tags includes at least three optical tags with the same center wavelength of the reflection spectrum; For each initial fiber optic link, each set of optical tags is placed at different positions in the initial fiber optic link to determine the fiber optic link corresponding to the initial fiber optic link.

8. A fiber optic link identification device, characterized in that, include: The fiber optic link acquisition module is used to acquire multiple fiber optic links; each fiber optic link is provided with at least one set of optical tags, and each set of optical tags includes at least three optical tags spaced apart; The detection module is used to transmit optical signals to each of the optical fiber links for the same group of optical tags in each of the optical fiber links, and to acquire the reflected signals after each of the optical tags in each of the optical fiber links reflects the optical signals. The beat frequency processing module is used to perform beat frequency processing and photoelectric conversion processing on the reflected signals of every two optical tags to obtain the beat frequency signal of every two optical tags. The determination module is used to filter the beat frequency signals of every two optical tags to determine the target signal corresponding to every two optical tags; the frequency of the target signal is proportional to the detection position difference between the two optical tags corresponding to the target signal. The fiber optic link identification module is used to determine the detection position difference between two optical tags corresponding to each target signal based on each target signal, and to identify each fiber optic link based on the detection position difference between each pair of optical tags.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the fiber optic link identification method as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the fiber optic link identification method as described in any one of claims 1 to 7.

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