Optical Cable Automatic Identification Method and System Based on Radio Frequency and Optical Time Domain Reflection

Abstract

The present application relates to the technical field of optical cable identification and detection, and discloses an automatic optical cable identification method and system based on wireless radio frequency and optical time domain reflection. The method comprises: collecting environmental disturbance parameters; setting a vibration mode based on the environmental disturbance parameters; selecting an optical cable without a radio frequency tag installed as the current optical cable; applying vibration disturbance to the current optical cable based on the vibration mode; identifying the current optical cable and obtaining the optical cable information of the current optical cable; installing an radio frequency tag for the current optical cable; binding the radio frequency tag with the optical cable information of the current optical cable; completing the installation of radio frequency tags for all optical cables; obtaining the optical cable information of the target optical cable and querying the radio frequency tag corresponding to the target optical cable; activating the radio frequency tag corresponding to the target optical cable and indicating the location of the target optical cable. The present application improves the accuracy and efficiency of optical cable identification and can adapt to various complex optical cable laying environments.

Description

Technical Field

[0001] The present application relates to the technical field of optical cable identification and detection, and in particular to an optical cable automatic identification method and system based on wireless radio frequency and optical time domain reflectometry. Background Art

[0002] Optical cable networks cover a wide area, involving numerous physical connection points and routing nodes. The complex and diverse environments in which optical cables are laid, including underground pipelines, inside buildings, bridges, and tunnels, complicates cable management and maintenance. Existing methods for identifying optical cables rely primarily on manual recording and tagging, which is prone to errors and omissions. In underground pipelines or buildings, the sheer number of optical cables and their complex wiring make it difficult for technicians to accurately locate the target cable, especially when multiple cables are laid in parallel. Relying solely on marking and manual searching is prone to errors. Even using an optical time domain detector (OTD) for detection can only provide an approximate location of the target cable. During OTD testing, the cable is affected by environmental mechanical vibrations, human activity, and other factors, resulting in phase shifts and frequency interference, affecting identification accuracy. Furthermore, physical contact and collisions between cables can interfere with the identification of the target cable. Existing technologies, under these conditions, make it difficult to determine which of the multiple cables is the target cable.

[0003] For example, Chinese patent application CN113438016B discloses a method for identifying optical cables, including: inputting detection light signals into multiple optical cable access ports in a first space to form multiple optical fiber sensing channels; applying vibration signals of different frequencies to multiple optical cables to be identified in a second space, which is located away from the first space; receiving multiple backscattered Rayleigh light signals returned by the multiple optical cables to be identified and converting them into backscattered Rayleigh electrical signals; collecting and analyzing the multiple backscattered Rayleigh electrical signals to obtain the vibration frequency corresponding to each optical fiber sensing channel; and determining the matching relationship between each optical fiber sensing channel and the optical cable to be identified in the second space based on the corresponding relationship between the vibration frequency and the vibration signal. This method can quickly identify and locate optical cables.

[0004] For example, a Chinese patent with authorization announcement number CN115189766B discloses a method, device, system and storage medium for identifying optical cables, which are used to improve the efficiency of identifying target operating optical cables among a large number of optical cables. The optical cable identification method includes: obtaining knocking waveform data according to a detection channel, the knocking waveform data is data generated by knocking an optical cable facility point; when the knocking waveform data meets a first vibration waveform condition, confirming that there is a target optical cable connected to the detection channel at the optical cable facility point, and obtaining distance data of the target optical cable at the optical cable facility point based on the knocking waveform data; obtaining frequency domain waveform data of the detection channel under the distance data, the frequency domain waveform data is generated by a vibration device loading vibration on a candidate optical cable in the optical cable facility point at a preset frequency; when the frequency domain waveform data meets a second vibration waveform condition at a preset frequency, confirming that the candidate optical cable is the target optical cable.

[0005] The above patents all have the problem raised by this background technology: when there are interferences such as environmental mechanical vibration, human activities, and physical contact and collision between optical cables, the recognition accuracy of the target optical cable will be affected.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0007] The technical problem to be solved by this application is to overcome the defects of the existing technology, provide an automatic optical cable identification method and system based on wireless radio frequency and optical time domain reflection, improve the accuracy and efficiency of optical cable identification, and improve the adaptability to various complex optical cable laying environments.

[0008] To solve the above technical problems, this application provides the following technical solutions:

[0009] In one aspect, the present application provides a method for automatic optical cable identification based on wireless radio frequency and optical time domain reflectometry, comprising the following steps:

[0010] S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters;

[0011] S2: selecting an optical cable without a radio frequency tag installed as the current optical cable; applying vibration interference to the current optical cable based on the vibration mode;

[0012] S3: Identify the current optical cable based on optical time domain detection and the vibration interference, and obtain optical cable information of the current optical cable;

[0013] S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable;

[0014] S5: Repeat S2 to S4 until the RFID tags on all optical cables are installed.

[0015] S6: Obtain the optical cable information of the target optical cable, and query the radio frequency tag corresponding to the target optical cable based on the optical cable information;

[0016] S7: Activate the radio frequency tag corresponding to the target optical cable to indicate and locate the target optical cable.

[0017] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the environmental disturbance parameters include the environmental disturbance frequency band and the signal distortion;

[0018] The collected environmental disturbance parameters include collecting environmental disturbance frequency bands; the collected environmental disturbance frequency bands are performed based on optical time domain detection, specifically including:

[0019] Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable;

[0020] Recording the phase of the detection signal to generate a time series of the phase of the detection signal;

[0021] The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

[0022] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the collecting of environmental disturbance parameters also includes determining the signal distortion, the method is as follows:

[0023] A vibration detection experiment is conducted, specifically as follows: randomly selecting an optical cable and applying a vibration disturbance with a specified frequency to the selected optical cable; performing optical time domain detection on each optical cable respectively, and recording the number of optical cables that detect the specified frequency; for any optical cable, a method for detecting the specified frequency is as follows: injecting a detection pulse into the optical cable, and continuously collecting detection signals to generate a time series of the detection signal phase; generating a spectrum diagram of the detection signal phase based on the time series of the detection signal phase; if there is a frequency component in the spectrum diagram with an amplitude greater than a preset amplitude threshold and a frequency difference from the specified frequency less than a preset deviation threshold, then the corresponding optical cable detects the specified frequency;

[0024] Repeat the vibration detection experiment at least p times. If the number of optical cables detecting the specified frequency is greater than 1 or equal to 0 in at least q vibration detection experiments, the signal distortion is high; otherwise, the signal distortion is low.

[0025] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the vibration mode includes the frequency and phase of the vibration signal; setting the vibration mode based on the environmental disturbance parameter includes setting the vibration signal frequency, the method is as follows:

[0026] Set the alternative vibration frequency band; the alternative vibration frequency band is the value range of the alternative vibration signal frequency.

[0027] If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency;

[0028] If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is the frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; calculate the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and among the m frequencies selected, there is no integer multiple relationship between any two frequencies.

[0029] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: setting the vibration mode based on the environmental disturbance parameter also includes setting the vibration signal phase, the method is as follows:

[0030] If the signal distortion is high, the vibration signal phase is set, specifically including:

[0031] Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, set the phase of the vibration signal with reference to the target phase sequence.

[0032] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes:

[0033] Injecting a detection pulse into each optical cable respectively, and continuously collecting the detection signal to generate a time series of the detection signal phase of each optical cable;

[0034] generating a spectrum diagram of the probe signal phase of each optical cable based on the time series of the probe signal phase;

[0035] If the vibration signal frequency is a single frequency, and there is a frequency component corresponding to the vibration signal frequency in the spectrum diagram of the detection signal phase of any optical cable, then the corresponding optical cable is marked as the first undetermined optical cable;

[0036] When the vibration signal frequency is the superposition frequency, and the spectrum diagram of the detection signal phase of any optical cable includes frequency components corresponding to each frequency involved in the superposition, the corresponding optical cable is marked as the first pending optical cable; if there is only one first pending optical cable, the first pending optical cable is the current optical cable.

[0037] As a preferred solution of the method for automatic optical cable identification based on wireless radio frequency and optical time domain reflectometry described in the present application, the method further comprises: identifying the current optical cable based on optical time domain detection and the vibration interference;

[0038] If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged in chronological order into a disturbance phase sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal;

[0039] The cross-correlation coefficients between the target phase sequence and the perturbation phase sequence of each first candidate optical cable at different lag times are calculated respectively; a correlation threshold is set; if there is a lag time such that the cross-correlation coefficient between the perturbation phase sequence of any first candidate optical cable and the target phase sequence is greater than the correlation threshold, the corresponding first candidate optical cable is marked as a second candidate optical cable; if there is only one second candidate optical cable, the second candidate optical cable is designated as the current optical cable.

[0040] As a preferred solution of the method for automatic optical cable identification based on wireless radio frequency and optical time domain reflectometry described in the present application, the method further comprises: identifying the current optical cable based on optical time domain detection and the vibration interference;

[0041] If there are at least two second pending optical cables, the mutual correlation coefficients of the perturbation phase sequences of any two second pending optical cables at different lag times are calculated; the lag time at which the mutual correlation coefficients of the perturbation phase sequences of the two second pending optical cables are greater than the correlation threshold is determined, and a phase change order of the two second pending optical cables is determined based on the lag time; all second pending optical cables are sorted according to the phase change order, and the second pending optical cable that undergoes phase change first is designated as the current optical cable.

[0042] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the optical cable information includes the optical cable number and optical cable attribute information; the optical cable attribute information includes optical cable identification information, key routing point information, and connection port information; any radio frequency tag has a unique identification code and a corresponding response frequency band;

[0043] Binding the RFID tag to the optical cable information of the current optical cable, specifically including: binding the optical cable number of the current optical cable to the identification code and response frequency band of the RFID tag, and sending them to the cloud server;

[0044] The method of querying the radio frequency tag corresponding to the target optical cable based on the optical cable information specifically includes:

[0045] Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information;

[0046] The cloud server is used to query the identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band.

[0047] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: any radio frequency tag includes an energy harvesting circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including:

[0048] Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code;

[0049] The RFID tag installed on the target optical cable responds to the RF signal, parses the coded instruction, obtains the identification code and determines whether the identification code is correct; if correct, it activates the energy harvesting circuit; the energy harvesting circuit converts the energy of the RF signal into direct current and lights up the corresponding passive LED.

[0050] In a second aspect, the present application provides an optical cable automatic identification system based on wireless radio frequency and optical time domain reflectometry, including a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein:

[0051] The vibrator module is used to apply vibration to the optical cable, and includes a control unit and a vibrator; the control unit controls the vibrator to generate a vibration signal based on a preset frequency and phase;

[0052] The optical time domain detection module is used to perform optical time domain detection on the optical cable;

[0053] The cloud server module includes a database and a cloud computing unit; the database is used to store the optical cable number, optical cable attribute information, and the identification code and response frequency band of the radio frequency tag bound to each optical cable; the cloud computing unit is used to set the vibration mode and send the command to control the vibration mode to the control unit;

[0054] The radio frequency tag module is used to indicate and locate the target optical cable;

[0055] The mobile terminal module includes a mobile terminal device and a radio frequency reader; the mobile terminal device queries the identification code and response frequency band of the radio frequency tag bound to the target optical cable from the cloud server module; the radio frequency reader sends a radio frequency signal to the optical cable area based on the identification code and response frequency band, activates the radio frequency tag installed on the target optical cable and lights up the corresponding LED.

[0056] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0057] By combining optical time-domain detection with specific vibration disturbance patterns, this application can accurately identify target optical cables subject to specific vibration disturbances. Compared with traditional marking and manual search methods, this application improves the accuracy and efficiency of identification.

[0058] This application dynamically adjusts the vibration mode according to the environmental interference conditions, thereby enhancing the reliability of optical cable identification, effectively distinguishing target optical cables even in complex interference environments, and reducing the impact of external factors on optical cable management and maintenance.

[0059] After installing a radio frequency tag for each optical cable, the present application only needs to activate the corresponding radio frequency tag and passive LED to locate the target optical cable again, thereby improving the efficiency of optical cable identification and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0061] Figure 1 Flowchart of the method for automatic optical cable identification based on wireless radio frequency and optical time domain reflectometry provided in this application;

[0062] Figure 2 A schematic diagram of the structure of the optical cable automatic identification system based on wireless radio frequency and optical time domain reflectometry provided by this application;

[0063] Figure 3 Flowchart of the method for collecting environmental disturbance frequency bands provided in this application. DETAILED DESCRIPTION

[0064] The technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Unless there is a conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0065] Example 1

[0066] This embodiment introduces an automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry. Figure 1 , the method comprises the following steps:

[0067] S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters;

[0068] The environmental disturbance parameters include environmental disturbance frequency band and signal distortion;

[0069] The collection of environmental disturbance parameters includes collecting environmental disturbance frequency bands and determining signal distortion; the collection of environmental disturbance frequency bands is based on optical time domain detection, referring to Figure 3 , specifically including:

[0070] Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable;

[0071] Recording the phase of the detection signal to generate a time series of the phase of the detection signal;

[0072] The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

[0073] A laser light source sends short pulses of optical signals into the optical cable. During transmission, these pulses are reflected and scattered by inhomogeneities in the optical cable's dielectric. Detecting the phase changes of the backscattered Rayleigh signal can reveal the impact of environmental disturbances on the optical cable. The time series of phases is converted to the frequency domain to obtain a spectrum, in which the frequency bands of environmental disturbances can be identified. For example, a spectrum amplitude threshold is set based on actual needs. Frequency components in the spectrum with amplitudes above the threshold constitute the environmental disturbance frequency band. Alternatively, the environmental disturbance frequency band can be extracted based on the mean and standard deviation of the amplitude of each frequency component in the spectrum. For example, all frequency components with amplitudes above the mean amplitude minus three times the standard deviation constitute the environmental disturbance frequency band.

[0074] The determining of the signal distortion degree specifically includes:

[0075] A vibration detection experiment is conducted, specifically as follows: randomly selecting an optical cable and applying a vibration disturbance with a specified frequency to the selected optical cable; performing optical time domain detection on each optical cable respectively, and recording the number of optical cables that detect the specified frequency; for any optical cable, a method for detecting the specified frequency is as follows: injecting a detection pulse into the optical cable, and continuously collecting detection signals to generate a time series of the detection signal phase; generating a spectrum diagram of the detection signal phase based on the time series of the detection signal phase; if there is a frequency component in the spectrum diagram with an amplitude greater than a preset amplitude threshold and a frequency difference from the specified frequency less than a preset deviation threshold, then the corresponding optical cable detects the specified frequency;

[0076] Repeat the vibration detection test at least p times. If the number of optical cables detected at the specified frequency in at least q vibration detection tests is greater than 1 or equal to 0, the signal distortion is high; otherwise, the signal distortion is low. Both p and q are positive integers.

[0077] Vibration detection experiments can reflect the collision and vibration transmission between multiple optical cables. If a vibration disturbance of a specified frequency is applied to an optical cable, but the specified frequency is detected in more than one optical cable, it means that there may be unexpected situations such as collision, adhesion, and entanglement between the optical cables, which will interfere with the detection of the applied vibration disturbance; if the specified frequency is not detected in any optical cable, it is due to severe signal distortion, resulting in the inability to effectively detect the vibration applied to the optical cable through frequency. Common causes of the above-mentioned high signal distortion include high environmental noise, complex periodicity of environmental interference, and multiple optical cables being subject to vibration interference from the same interference source.

[0078] The vibration mode includes the frequency and phase of the vibration signal; setting the vibration mode based on the environmental disturbance parameter includes setting the vibration signal frequency and setting the vibration signal phase; wherein, setting the vibration signal frequency specifically includes:

[0079] Set the alternative vibration frequency band; the alternative vibration frequency band is the value range of the alternative vibration signal frequency.

[0080] If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency;

[0081] If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is the frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; calculate the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and there is no integer multiple relationship between any two frequencies among the selected m frequencies. m is a positive integer greater than 1. For example, if the optional vibration frequency band is 5-30Hz, and the environmental disturbance frequency band includes 0-5Hz and 10-20Hz, then the optional frequency bands include 6-9Hz and 21-30Hz. Set the proportional threshold Calculate d by the total length of the optional frequency band and the length of the alternative vibration frequency band. If d is less than , the environmental disturbance frequency band is too long, while the optional frequency band is short; then selecting m frequencies from the optional frequency band for frequency superposition can avoid the situation where only one frequency is selected as the vibration signal frequency and optical time domain detection may not be effective under the premise that there is a certain system error in frequency detection. Let m be equal to 2, then select 2 frequencies from the alternative vibration frequency band for superposition, for example, select 7Hz and 23Hz. There is no integer multiple relationship between these two frequencies, which can avoid mutual interference and will not generate harmonics, which is helpful for the subsequent identification and distinction of these two frequency components in the complex spectrum of the detection signal phase. If the vibration signal frequency is set as the superposition frequency, the vibration signal will appear as a complex periodic waveform, and the period is the least common multiple of the periods corresponding to all the frequencies involved in the superposition. Each frequency involved in the superposition corresponds to a clear frequency component in the spectrum of the detection signal phase.

[0082] The setting of the vibration signal phase specifically includes:

[0083] If the signal distortion is high, the vibration signal phase is set as follows:

[0084] Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, the phase of the vibration signal is set with reference to the target phase sequence. For example, let the vibration signal be a sine wave with an initial phase of 0. A preferred way to set the phase of the vibration signal is to increase the phase by 1 every two cycles. , then the elements in the target phase sequence are changing periodically, and the period of change is 16 times the period of the vibration signal. This application can avoid random environmental vibration interference during optical time domain detection by setting a vibration mode with a specific frequency. By identifying the pre-set vibration frequency, the influence of random interference that does not have a stable frequency can be effectively screened out, such as natural noise such as wind and rain, ground vibration caused by passing vehicles, and interference to the optical cable caused by nearby people walking and construction activities.

[0085] Furthermore, the present application can avoid periodic environmental vibration interference during optical time domain detection by setting a vibration mode with multiple frequencies superimposed. By setting a vibration mode with multiple frequencies superimposed or frequency hopping, it is possible to identify superimposed frequencies in optical time domain detection, thereby screening out environmental interference that does not have the same frequency characteristics, such as the operation of mechanical equipment (such as the periodic operation of equipment such as pumps and compressors), and power system interference (such as the 50Hz power frequency and its harmonics in the power grid) that causes interference with a stable frequency range on optical time domain detection.

[0086] Furthermore, by setting a vibration pattern that includes phase variation patterns, this application can ensure accurate identification of current optical cables even in situations with severe signal distortion. Setting the vibration signal phase provides a recognizable phase signature for optical time-domain detection, avoiding the potential lack of accuracy in environments with high signal distortion, where simply detecting the vibration signal's frequency might be insufficient.

[0087] S2: Select an optical cable without a radio frequency tag installed as the current optical cable; apply vibration interference to the current optical cable based on the vibration mode; specifically including: generating a vibration signal based on the set vibration mode; and applying the vibration signal to the current optical cable.

[0088] S3: Identify the current optical cable based on optical time domain detection and the vibration interference, and obtain optical cable information of the current optical cable;

[0089] Identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes:

[0090] Injecting a detection pulse into each optical cable respectively, and continuously collecting the detection signal to generate a time series of the detection signal phase of each optical cable;

[0091] generating a spectrum diagram of the probe signal phase of each optical cable based on the time series of the probe signal phase;

[0092] When the vibration signal frequency is a single frequency, if a frequency component corresponding to the vibration signal frequency exists in the frequency spectrum of the detection signal phase of any optical cable, the corresponding optical cable is marked as the first undetermined optical cable; a method for determining whether a frequency component corresponding to the vibration signal frequency exists in the frequency spectrum is as follows: if a frequency component whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the vibration signal frequency is less than a preset deviation threshold exists in the frequency spectrum, then a frequency component corresponding to the vibration signal frequency exists in the frequency spectrum;

[0093] When the vibration signal frequency is a superposition frequency, if the frequency spectrum of the detection signal phase of any optical cable includes frequency components corresponding to each frequency participating in the superposition, the corresponding optical cable is marked as the first undetermined optical cable; wherein, the method for determining whether the frequency spectrum includes frequency components corresponding to any frequency participating in the superposition is as follows: if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the frequency participating in the superposition is less than a preset deviation threshold, then the frequency component corresponding to the frequency exists in the frequency spectrum;

[0094] If there is only one first pending optical cable, the first pending optical cable is the current optical cable.

[0095] When an external vibration signal is applied to an optical cable, it causes physical deformation (such as stretching or bending) of the cable. This deformation changes the refractive index and optical path length in that region, causing a phase shift in the detection signal passing through that region. If the applied vibration is a periodic signal (such as a sine wave), the physical deformation of the optical cable is also periodic, resulting in a corresponding periodic phase modulation of the detection signal, with the frequency of the phase shift being the same as the applied vibration signal.

[0096] Identifying the current optical cable based on optical time domain detection and the vibration interference also includes:

[0097] If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged in chronological order into a disturbance phase sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal;

[0098] The cross-correlation coefficients between the target phase sequence and the perturbation phase sequence of each first candidate optical cable are calculated at different lag times. The cross-correlation coefficient measures the similarity between two time series at any lag time. Lag time refers to the amount of advance or delay in time between one time series and another. By calculating the cross-correlation coefficients at different lag times, it is determined whether a lag relationship exists between the two time series and the specific lag time of this lag relationship.

[0099] Setting a correlation threshold; if there is a lag time such that the mutual correlation coefficient between the disturbance phase sequence of any first candidate optical cable and the target phase sequence is greater than the correlation threshold, marking the corresponding first candidate optical cable as a second candidate optical cable;

[0100] If there is only one second pending optical cable, the second pending optical cable is the current optical cable.

[0101] By continuously tracking the phase of the disturbance signal of each first-to-be-determined optical cable, the present application can effectively identify the current optical cable that is disturbed by a vibration signal with a specific phase change law, thereby screening out other optical cables whose phase change frequency is close to that of the current optical cable due to unexpected environmental interference. For example, the nonlinear effect of the optical fiber and the electromagnetic interference of nearby electrical equipment may cause the phase change of the backward Rayleigh scattering signal in the optical cable. When the mutual correlation coefficient between the disturbance phase sequence and the target phase sequence of any first-to-be-determined optical cable is greater than the correlation threshold, it means that the phase change of the detection signal of the optical cable is linearly correlated with the phase change of the vibration signal, that is, the phase change of the detection signal of the optical cable is determined by the vibration signal, rather than by other environmental factors that do not have the same phase change law as the vibration signal.

[0102] As previously mentioned, the vibration signal's impact on the optical cable causes phase modulation of the detection signal. Appropriate phase demodulation techniques, such as lock-in amplifiers and Hilbert transforms, can be used to extract the phase information of the applied vibration signal from the phase variation pattern of the detection signal. Phase information provides higher resolution and sensitivity than amplitude and frequency information, facilitating more accurate detection and identification of vibration signals.

[0103] Identifying the current optical cable based on optical time domain detection and the vibration interference also includes:

[0104] If there are at least two second pending optical cables, the mutual correlation coefficients of the perturbation phase sequences of any two second pending optical cables at different lag times are calculated; the lag time at which the mutual correlation coefficients of the perturbation phase sequences of the two second pending optical cables are greater than the correlation threshold is determined, and a phase change order of the two second pending optical cables is determined based on the lag time; all second pending optical cables are sorted according to the phase change order, and the second pending optical cable that undergoes phase change first is designated as the current optical cable.

[0105] This application identifies the current optical cable among multiple second optical cables by determining the second pending optical cable that first undergoes a phase change. This solves the problem of the phase change pattern of the target optical cable's detection signal being transmitted to other optical cables due to physical contact such as cable collision, entanglement, and accidental close contact. Since the perturbed phase sequence of each second pending optical cable is linearly correlated with the target phase sequence, the perturbed phase sequences of any two second pending optical cables are also linearly correlated. By finding the lag time between the perturbed phase sequences of the two second pending optical cables, the order in which the phase changes of the two second pending optical cables occur can be determined. For example, if the perturbed phase sequence of second pending optical cable A is linearly correlated with the perturbed phase sequence of second pending optical cable B under the condition that the lag time is greater than 0, then the phase change of second pending optical cable B precedes that of second pending optical cable A. Since the current optical cable is directly disturbed by the vibration signal, causing the phase change of the detection signal, the other second pending optical cables are all directly or indirectly disturbed by the current optical cable, causing the phase change of the detection signal. Therefore, the second pending optical cable that first undergoes a phase change is the current optical cable.

[0106] The optical cable information includes the optical cable number and the optical cable attribute information; the optical cable attribute information includes the optical cable identification information, key routing point information, and connection port information;

[0107] If the target optical cable is a faulty cable or a cable with a changed route, it is necessary to identify the target optical cable among multiple optical cables to facilitate troubleshooting and route updates. Optical cable attribute information is used to quickly query the corresponding optical cable number. For example, optical cable identification information includes the cable name, manufacturer name, cable model, production date, and batch information. Key routing point information includes the node type, node number, and node coordinates of important nodes such as junction boxes, distribution frames, and splice boxes that the optical cable passes through during laying. Connection port information includes the physical interface information between the optical cable and other devices or cables, specifically including port number, port type, port status, and connection object (such as another optical cable, switch, router, or other device). If some of the target optical cable's attribute information is known, the corresponding database can be accessed to quickly retrieve the target optical cable's cable number.

[0108] S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable;

[0109] Any RFID tag has a unique identification code and a corresponding response frequency band;

[0110] Bind the RFID tag to the cable information of the current optical cable, specifically including: binding the cable number of the current optical cable with the identification code and response frequency band of the RFID tag, and sending them to the cloud server.

[0111] The identification code is the unique ID number of each RFID tag. The response frequency band is the frequency range of the radio frequency signal that can activate the RFID tag; the RFID tag installed on each optical cable has a different response frequency band.

[0112] S5: Repeat S2 to S4 until the RFID tags on all optical cables are installed.

[0113] S6: Obtain the optical cable information of the target optical cable, and query the radio frequency tag corresponding to the target optical cable based on the optical cable information; specifically, including:

[0114] Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information;

[0115] The cloud server is used to query the identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band.

[0116] S7: Activate the radio frequency tag corresponding to the target optical cable to indicate and locate the target optical cable.

[0117] Any radio frequency tag includes an energy harvesting circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including:

[0118] Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code;

[0119] The RFID tag installed on the target optical cable responds to the RF signal, parses the coded instruction, obtains the identification code and determines whether the identification code is correct; if correct, it activates the energy harvesting circuit; the energy harvesting circuit converts the energy of the RF signal into direct current and lights up the corresponding passive LED.

[0120] After receiving the RF signal, the RFID tag converts the signal energy into electrical energy through its antenna, providing power to the tag's internal circuitry. It then demodulates the RF signal and extracts the encoded instructions. The chip inside the tag analyzes the encoded instructions. If the identification code in the encoded instruction matches the tag's own, the identification code is correct and the energy harvesting circuit is activated. This energy harvesting circuit rectifies and filters the RF energy received by the RFID tag, converting it into direct current (DC) sufficient to drive an LED, which then illuminates and locates the target optical cable.

[0121] Example 2

[0122] This embodiment is the second embodiment of the present application; it is based on the same inventive concept as embodiment 1, and Figure 2This embodiment introduces an optical cable automatic identification system based on wireless radio frequency and optical time domain reflectometry, including a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein:

[0123] The vibrator module is used to apply vibration to the optical cable; the vibrator module includes a control unit and a vibrator. The control unit controls the vibrator based on a preset frequency and phase, and the vibrator generates a vibration signal with a specified frequency and phase.

[0124] The optical time domain detection module is used to perform optical time domain detection on optical cables. It includes a light source, a detector, an optical time domain reflectometer, and a data processing unit. The light source is used to generate detection pulses and inject them into the optical cable; the detector is used to receive the detection signal; the optical time domain reflectometer is used to extract the phase of the detection signal; and the data processing unit is used to generate a time series of the detection signal phase and perform spectrum analysis on the detection signal phase to identify the frequency and phase of the vibration signal. The data processing unit is also equipped with relevant algorithms to calculate the environmental interference frequency band and signal distortion.

[0125] The cloud server module includes a database and a cloud computing unit. The database stores the cable ID and attributes of each optical cable, as well as the identification code and response frequency band of the radio frequency tag attached to each cable. The cloud computing unit sets the vibration pattern based on the ambient disturbance frequency band and signal distortion, and sends the vibration pattern control instructions to the vibrator module's control unit. The cloud computing unit also identifies the current optical cable based on the frequency and phase of the vibration signal.

[0126] The radio frequency tag module is used to indicate and locate the target optical cable; the radio frequency tag module includes a radio frequency tag installed on each optical cable, and each radio frequency tag includes an energy collection circuit and a passive LED.

[0127] The mobile terminal module includes a mobile terminal device and a radio frequency reader / writer. The mobile terminal device is used to transmit the optical cable attribute information of the target optical cable to the cloud server module and receive the identification code and response frequency band of the radio frequency tag bound to the target optical cable from the cloud server module. The radio frequency reader / writer transmits an RF signal to the optical cable area based on the identification code and response frequency band, activating the radio frequency tag installed on the target optical cable and lighting the corresponding LED. The mobile terminal device is used to bind the optical cable number of each optical cable to the identification code and response frequency band of the corresponding radio frequency tag, and then transmit it to the cloud server module.

[0128] The specific functions of the above modules are implemented by referring to the relevant contents of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in Example 1, and are not described in detail here.

[0129] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0130] The above describes the embodiments of the present application in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose and scope of protection of this application, all of which are protected by this application.

Claims

1. An automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry, characterized in that: The following steps are involved: S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters; The environmental disturbance parameters include an environmental disturbance frequency band and a signal distortion degree; the vibration mode includes a frequency and a phase of a vibration signal; wherein the method for setting the frequency of the vibration signal includes setting the frequency of the vibration signal to a frequency in a non-environmental disturbance frequency band; and the method for setting the phase of the vibration signal includes setting a periodically changing phase of the vibration signal if the signal distortion degree is high. The method for determining the signal distortion is as follows: A vibration detection experiment is conducted, specifically as follows: randomly selecting an optical cable and applying a vibration disturbance with a specified frequency to the selected optical cable; performing optical time domain detection on each optical cable respectively, and recording the number of optical cables that detect the specified frequency; for any optical cable, a method for detecting the specified frequency is as follows: injecting a detection pulse into the optical cable, and continuously collecting detection signals to generate a time series of the detection signal phase; generating a spectrum diagram of the detection signal phase based on the time series of the detection signal phase; if there is a frequency component in the spectrum diagram with an amplitude greater than a preset amplitude threshold and a frequency difference from the specified frequency less than a preset deviation threshold, then the corresponding optical cable detects the specified frequency; Repeating the vibration detection experiment at least p times, if the number of optical cables detected at the specified frequency in at least q vibration detection experiments is greater than 1 or equal to 0, the signal distortion is high; otherwise, the signal distortion is low; S2: selecting an optical cable without a radio frequency tag installed as the current optical cable; applying vibration interference to the current optical cable based on the vibration mode; S3: Identify the current optical cable based on optical time domain detection and the vibration interference, and obtain optical cable information of the current optical cable; S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable; S5: Repeat S2 to S4 until the RFID tags on all optical cables are installed. S6: Obtain the optical cable information of the target optical cable, and query the radio frequency tag corresponding to the target optical cable based on the optical cable information; S7: Activate the radio frequency tag corresponding to the target optical cable to indicate and locate the target optical cable.

2. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 1, characterized in that: The collecting of environmental disturbance parameters includes collecting environmental disturbance frequency bands; The collection of environmental disturbance frequency bands is performed based on optical time domain detection, specifically including: Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable; Recording the phase of the detection signal to generate a time series of the phase of the detection signal; The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

3. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 2, characterized in that: Setting the vibration mode based on the environmental disturbance parameter includes setting the vibration signal frequency as follows: Set the alternative vibration frequency band; the alternative vibration frequency band is the value range of the alternative vibration signal frequency; If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency; If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is the frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; calculate the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and among the m frequencies selected, there is no integer multiple relationship between any two frequencies.

4. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 3, characterized in that: Setting the vibration mode based on the environmental disturbance parameter also includes setting the vibration signal phase as follows: If the signal distortion is high, the vibration signal phase is set, specifically including: Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, set the phase of the vibration signal with reference to the target phase sequence.

5. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 4, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes: Injecting a detection pulse into each optical cable respectively and continuously collecting the detection signal; generating a time series of the detection signal phase of each optical cable; generating a spectrum diagram of the probe signal phase of each optical cable based on the time series of the probe signal phase; If the vibration signal frequency is a single frequency, and there is a frequency component corresponding to the vibration signal frequency in the spectrum diagram of the detection signal phase of any optical cable, then the corresponding optical cable is marked as the first undetermined optical cable; When the vibration signal frequency is the superposition frequency, and the spectrum diagram of the detection signal phase of any optical cable includes frequency components corresponding to each frequency involved in the superposition, the corresponding optical cable is marked as the first pending optical cable; if there is only one first pending optical cable, the first pending optical cable is the current optical cable.

6. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 5, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged in chronological order into a disturbance phase sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal; The cross-correlation coefficients between the target phase sequence and the perturbation phase sequence of each first candidate optical cable at different lag times are calculated respectively; a correlation threshold is set; if there is a lag time such that the cross-correlation coefficient between the perturbation phase sequence of any first candidate optical cable and the target phase sequence is greater than the correlation threshold, the corresponding first candidate optical cable is marked as a second candidate optical cable; if there is only one second candidate optical cable, the second candidate optical cable is designated as the current optical cable.

7. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 6, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two second pending optical cables, the mutual correlation coefficients of the perturbation phase sequences of any two second pending optical cables at different lag times are calculated; the lag time at which the mutual correlation coefficients of the perturbation phase sequences of the two second pending optical cables are greater than the correlation threshold is determined, and a phase change order of the two second pending optical cables is determined based on the lag time; all second pending optical cables are sorted according to the phase change order, and the second pending optical cable that undergoes phase change first is designated as the current optical cable.

8. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 7, characterized in that: The optical cable information includes the optical cable number and the optical cable attribute information; the optical cable attribute information includes the optical cable identification information, key routing point information, and connection port information; Any RFID tag has a unique identification code and a corresponding response frequency band; Binding the RFID tag to the optical cable information of the current optical cable, specifically including: binding the optical cable number of the current optical cable to the identification code and response frequency band of the RFID tag, and sending them to the cloud server; The method of querying the radio frequency tag corresponding to the target optical cable based on the optical cable information specifically includes: Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information; The cloud server is used to query the identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band.

9. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 8, characterized in that: Any radio frequency tag includes an energy harvesting circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including: Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code; The RFID tag installed on the target optical cable responds to the RF signal, parses the coded instruction, obtains the identification code and determines whether the identification code is correct; if correct, it activates the energy harvesting circuit; the energy harvesting circuit converts the energy of the RF signal into direct current and lights up the corresponding passive LED.

10. An automatic optical cable identification system based on wireless radio frequency and optical time domain reflectometry, which is used to implement the automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry according to any one of claims 1 to 9, characterized in that: It includes a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein: The vibrator module is used to apply vibration to the optical cable, and includes a control unit and a vibrator; the control unit controls the vibrator to generate a vibration signal based on a preset frequency and phase; The optical time domain detection module is used to perform optical time domain detection on the optical cable; The cloud server module includes a database and a cloud computing unit; the database is used to store the optical cable number, optical cable attribute information, and the identification code and response frequency band of the radio frequency tag bound to each optical cable; the cloud computing unit is used to set the vibration mode and send the command to control the vibration mode to the control unit; The radio frequency tag module is used to indicate and locate the target optical cable; The mobile terminal module includes a mobile terminal device and a radio frequency reader / writer; the mobile terminal device queries the identification code and response frequency band of the radio frequency tag bound to the target optical cable from the cloud server module; the radio frequency reader / writer sends a radio frequency signal to the area where the optical cable is located based on the identification code and response frequency band, activates the radio frequency tag installed on the target optical cable and lights up the corresponding LED.

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