Optical cable same-trench same-cable detection method and system based on related optical detection technology

Abstract

The invention discloses an optical cable same-trench and same-cable detection method and system based on a related optical detection technology, belongs to the technical field of optical communication, and aims to solve the technical problem of analyzing whether a same-trench and same-cable routing hidden danger exists in an optical path in an optical transmission network. The method includes: acquiring light path data; acquiring bottom-layer basic layer data related to the geographic information; obtaining an oscillogram of coherent light through an optical frequency heterodyne detection principle, and calculating a coherence length based on the oscillogram; combining a plurality of continuous coherence lengths into a coherence event, and calculating the coherence length of each coherence event; carrying out screening based on a ratio between the length of the bearing section and the coherence length of the coherence event, and carrying out overlay analysis and marking on the bearing section based on the bottom layer basic layer data and the bearing section data; and matching the bearing section data with the light path data, and synchronously displaying the matched bearing section data on a map.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and in particular to a method and system for detecting co-laying of optical cables based on relevant optical detection technologies. Background Art

[0002] In the scope of dumb resource management, as the main entity for carrying service information, optical cables are often damaged by external forces, resulting in interruption of primary and backup services. For example, communication optical cables are cut by construction operations, impacted by floods and mudslides, or there is a fire in the optical cable routing well. When a service interruption occurs, a good primary and backup optical path switching can avoid the further spread of the accident impact. In the current process of transmission network maintenance, due to the large network scale, frequent operations such as on-site service cutover and migration, there is a certain difference between the actual physical routing of optical cables and the asset management. Therefore, analyzing based on the data stored in the asset management system may lead to problems such as untimely fault handling and slow response speed.

[0003] Currently, for the business scenario of co-laying of optical cables, the following several scenario analyses are mainly carried out according to the asset management network data:

[0004] 1. Analysis from the perspective of circuits:

[0005] (1) The circuit itself is divided into primary and backup routing information. At this time, when analyzing the co-routing of a single circuit data, the co-routing result between the primary route and the standby route of this circuit is analyzed. Then, the primary route is set as group 1, the standby route is set as group 2, and cross-checking is carried out between group 1 and group 2.

[0006] (2) If it is a verification of multiple circuits, there are at least two circuits. At this time, the circuit data is grouped, at least divided into group 1 and group 2, and infinite grouping according to the circuit data is supported until the cross-checking method between each circuit is satisfied.

[0007] 2. Analysis from the perspective of optical paths:

[0008] (1) The optical path routing table of the optical path has data on local fibers and jump fibers. At this time, the primary key of the local fiber exists and the local fiber data can be associated.

[0009] (2) According to the primary key of the local fiber and the local fiber routing table for association, the local fiber routing table stores the optical cable fiber cores and optical cable section resources passed by the local fiber. Thus, all the optical cable section data passed under this optical path can be obtained.

[0010] (3) According to the grouping information of different optical paths, data verification between groups is carried out, mainly verifying the cross situation of optical cable sections under the optical path.

[0011] 3. Analysis from the perspective of topological connection

[0012] (1)Match the port information at both ends of AZ in the topological link with the optical path data. Obtain the data information to be verified according to the matching result.

[0013] (2)Verify and check using the verification logic of the multiplexed optical path.

[0014] 4. Analyze from the perspective of the optical cable section.

[0015] (1)After the optical cable section resources are used in the optical cable laying function, the information of the bearing section passed by the optical cable will be stored. This information is in the optical cable laying table;

[0016] (2)Associate with the bearing section resources according to the bearing type and the primary key field of the bearing section in the optical cable laying table;

[0017] (3)According to the grouping information of different optical cable sections, conduct data verification between groups, mainly verifying the crossing situation of the bearing sections and bearing points under the optical cable section.

[0018] Analyzing whether there are potential routing hazards of the same trench and the same cable for the optical paths in the optical transmission network is a technical problem to be solved. Summary of the Invention

[0019] The technical task of the present invention is to address the above deficiencies and provide an optical cable same-trench and same-cable detection method and system based on relevant optical detection technologies to solve the technical problems of the optical cable same-trench and same-cable detection method and system based on relevant optical detection technologies.

[0020] In the first aspect, a method for detecting the same trench and the same cable of an optical cable based on relevant optical detection technologies according to the present invention includes the following steps:

[0021] Optical path data acquisition: For the optical transmission network to be analyzed, obtain the optical path data, which is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, physical attributes of the optical cable, logical attributes of the optical path, and network resource information;

[0022] Layer data acquisition: For the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community surfaces;

[0023] Coherence length calculation: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherence length based on the waveform diagram;

[0024] Coherence event analysis: Combine multiple consecutive coherence lengths into one coherence event to obtain multiple coherence events. Each coherence event represents a continuous bearing section, number and mark the coherence events, and calculate the coherence length of each coherence event;

[0025] Carrier segment analysis: Analyze each coherent event. When analyzing, obtain the possible carrier segment data passed through based on the coherent length of the coherent event. For each possible carrier segment passed through, screen based on the ratio between the carrier segment length and the coherent length of the coherent event, classify the types of the carrier segments that meet the screening conditions, and perform overlay analysis and marking on the carrier segments based on the underlying basic layer data and the carrier segment data. After analyzing all coherent events, record all the possible carrier segment data passed through;

[0026] Map display: For all possible carrier segments passed through, match the carrier segment data with the optical path data, synchronously display the carrier segment data that passes the match on the map, and infer whether there is a scenario of same trench and same cable in the existing network.

[0027] Preferably, the coherent length calculation includes the following steps:

[0028] Connect the coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal;

[0029] Split the optical signal into two paths. One path is used as the local signal, and the other path is used as the reference light after changing the frequency through the acousto-optic modulator and injected into the optical fiber to be measured. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram;

[0030] Obtain the waveform diagram of the coherent light in the optical fiber through the coherent optical reflectometer. The waveform diagram reflects the phase change of the optical signal when propagating in the optical fiber;

[0031] Extract the coherent length from the waveform diagram. The calculation formula for the coherent length L is:

[0032] L = λ 2 / Δλ,

[0033] where λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

[0034] Preferably, when calculating the coherent length of the coherent event, for the coherent event numbered M1, the corresponding coherent length L1 is expressed by the calculation formula as:

[0035] L1 = T * c,

[0036] where T represents the co-frequency time of the coherent light, and c represents the propagation speed of the optical signal in the optical cable.

[0037] Preferably, for the k-th coherent event, the carrier segment analysis includes the following steps:

[0038] For the coherent event to be analyzed, according to the event of the optical fiber reaching the coherent event, recursively query the optical fiber core information connected to the optical fiber through patching and splicing actions in the asset management system;

[0039] Obtain the data of the possible passing bearing segments according to the coherence length of the coherence event;

[0040] For each possible bearing segment, compare and analyze the bearing segment length R with the coherence length Lk of the coherence event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearing segment meets the screening conditions, and the bearing segments that meet the screening conditions are classified by type. The types of bearing segments include pipeline segments, pole line segments, directly buried segments, wall-mounted segments, and lead-up segments.

[0041] Preferably, when performing overlay analysis and marking on the bearing segment based on the underlying basic layer data and the bearing segment data, for a certain bearing segment, if the corresponding underlying basic layer data overlaps or intersects with the bearing segment data, it is determined that the bearing segment route may be incorrect data entered during construction and is marked.

[0042] In a second aspect, an optical cable same-gutter and same-cable detection system based on the relevant optical detection technology of the present invention includes an optical path data acquisition module, a layer data acquisition module, a coherence length calculation module, a coherence event analysis module, a bearing segment analysis module, and a map display module;

[0043] The optical path data acquisition module is used to perform the following operations: for the optical transmission network to be analyzed, obtain the optical path data, and the optical path data is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, optical cable physical attributes, optical path logical attributes, and network resource information of the optical path;

[0044] The layer data acquisition module is used to perform the following operations: for the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community surfaces;

[0045] The coherence length calculation module is used to perform the following operations: connect the coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherence length based on the waveform diagram;

[0046] The coherence event analysis module is used to perform the following operations: combine multiple consecutive coherence lengths into one coherence event to obtain multiple coherence events, each coherence event represents a continuous bearing segment, number and mark the coherence events, and calculate the coherence length of each coherence event;

[0047] The bearer segment analysis module is used to perform the following operations: analyze each coherent event. When analyzing, based on the coherent length of the coherent event, obtain the data of the possible bearer segments that may pass through. For each possible bearer segment, perform screening based on the ratio between the bearer segment length and the coherent length of the coherent event, classify the types of the bearer segments that meet the screening conditions, and perform overlay analysis and marking on the bearer segments based on the underlying basic layer data and the bearer segment data. After analyzing all coherent events, record all the data of the possible bearer segments that may pass through.

[0048] The map display module is used to perform the following operations: for all possible bearer segments, match the bearer segment data with the optical path data, synchronously display the matched bearer segment data on the map, and infer whether there is a scenario of same trench and same cable in the existing network.

[0049] Preferably, the coherent length calculation module is used to perform the following operations:

[0050] Connect the coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal;

[0051] Split the optical signal into two paths. One path is used as the local signal, and the other path passes through an acousto-optic modulator to change the frequency and then is injected into the optical fiber to be measured as the reference light. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram;

[0052] Obtain the waveform diagram of the coherent light in the optical fiber through the coherent optical reflectometer. The waveform diagram reflects the phase change situation of the optical signal when propagating in the optical fiber;

[0053] Extract the coherent length from the waveform diagram. The calculation formula for the coherent length L is:

[0054] L = λ 2 / Δλ,

[0055] where λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

[0056] Preferably, when calculating the coherent length of the coherent event, for the coherent event numbered M1, the corresponding coherent length L1 is expressed by the calculation formula as:

[0057] L1 = T * c,

[0058] where T represents the co-frequency time of the coherent light, and c represents the propagation speed of the optical signal in the optical cable.

[0059] Preferably, for the k-th coherent event, the bearer segment analysis module is used to perform the following operations:

[0060] For the coherent event to be analyzed, according to the event of the optical fiber reaching the coherent event, recursively query the fiber core information connected to the optical fiber through pigtail and fusion splicing actions in the asset management system;

[0061] Obtain the data of the possible bearer segments according to the coherence length of the coherence events;

[0062] For each possible bearer segment, compare and analyze the length R of the bearer segment with the coherence length Lk of the coherence event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearer segment meets the screening conditions, and the bearer segments that meet the screening conditions are classified by type. The types of bearer segments include pipe segments, pole line segments, directly buried segments, wall-mounted segments, and lead-up segments.

[0063] Preferably, when performing overlay analysis and marking on the bearer segments based on the underlying basic layer data and the bearer segment data, for a certain bearer segment, if the corresponding underlying basic layer data overlaps or intersects with the bearer segment data, it is determined that the bearer segment route may be incorrect data entered during construction and is marked.

[0064] The optical cable same-ditch and same-cable detection method and system based on the relevant optical detection technology of the present invention have the following advantages:

[0065] 1. It can support the rectification of the existing data, adjust the existing function of the optical path route, and eliminate the risk of same-ditch and same-cable;

[0066] 2. It can be integrated into the business process of the existing network of asset management, accurately schedule the optical path route, that is, avoid the risk of the same route before planning, conduct route verification before the equipment network element is put into the network; conduct troubleshooting on the existing network data during daily maintenance; analyze the potential hazards of the cutover route after network adjustment and fault repair;

[0067] 3. It can reduce the frequency of manual on-site visits, gradually evolve from the traditional manual confirmation combined with continuous rectification of the existing network data to the combination of manual + intelligent analysis, and ultimately achieve the purpose of automatic detection and automatic analysis by the system, improving the detection efficiency. Description of the Drawings

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0069] The present invention will be further described below with reference to the drawings.

[0070] Figure 1 It is a flowchart of Embodiment 1. Detailed Embodiment

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it. However, the embodiments cited are not intended to limit the present invention. Without conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0072] An embodiment of the present invention provides a method and system for detecting the same trench and same cable of optical cables based on coherent optical detection technology, which is used to solve the technical problem of analyzing the routing hidden danger of whether there is the same trench and same cable in the optical path in the optical transmission network.

[0073] Embodiment 1:

[0074] A method for detecting the same trench and same cable of optical cables based on coherent optical detection technology according to the present invention includes six steps: optical path data acquisition, layer data acquisition, coherence length calculation, coherence event analysis, bearer segment analysis, and map display.

[0075] Step S100 Optical path data acquisition: For the optical transmission network to be analyzed, obtain optical path data, which is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, physical attributes of the optical cable, logical attributes of the optical path, and network resource information of the optical path.

[0076] Step S200 Layer data acquisition: For the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community surfaces.

[0077] Step S300 Coherence length calculation: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherence length based on the waveform diagram.

[0078] The coherence length calculation includes the following steps:

[0079] (1) Connect the coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal;

[0080] (2) Divide the optical signal into two paths. One path is used as the local signal, and the other path is used as the reference light after changing the frequency through the acousto-optic modulator and injected into the optical fiber to be measured. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram;

[0081] (3) Obtain the waveform diagram of the coherent light in the optical fiber through the coherent optical reflectometer. The waveform diagram reflects the phase change situation of the optical signal when propagating in the optical fiber;

[0082] (4) Extract the coherence length from the waveform diagram. The calculation formula for the coherence length L is:

[0083] L = λ 2 / Δλ,

[0084] Among them, λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

[0085] Step S400 Coherent Event Analysis: Combine multiple consecutive coherence lengths into one coherent event to obtain multiple coherent events. Each coherent event represents a continuous bearing section. Number and mark the coherent events, and calculate the coherence length of each coherent event.

[0086] When calculating the coherence length of a coherent event, for the coherent event numbered M1, the corresponding coherence length L1 is expressed by the calculation formula: L1 = T * c,

[0087] Among them, T represents the co-frequency time of the coherent light, and c represents the propagation speed of the optical signal in the optical cable.

[0088] Step S500 Bearing Section Analysis: Analyze each coherent event. When analyzing, obtain the possible bearing section data based on the coherence length of the coherent event. For each possible bearing section, screen based on the ratio between the bearing section length and the coherence length of the coherent event. Classify the bearing sections that meet the screening conditions, and perform overlay analysis and marking on the bearing sections based on the underlying basic layer data and the bearing section data. After analyzing all coherent events, record all possible bearing section data.

[0089] For the k-th coherent event, the bearing section analysis includes the following steps:

[0090] (1) For the coherent event to be analyzed, according to the event of the optical fiber reaching the coherent event, recursively query the fiber core information connected to the optical fiber through pigtail and fusion splicing actions in the asset management system;

[0091] (2) Obtain the possible bearing section data according to the coherence length of the coherent event;

[0092] (3) For each possible bearing section, compare and analyze the bearing section length R with the coherence length Lk of the coherent event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearing section meets the screening conditions, and classify the bearing sections that meet the screening conditions. The types of bearing sections include duct sections, pole sections, directly buried sections, wall-mounted sections, and lead-in sections.

[0093] When performing overlay analysis and marking on the bearing section based on the underlying basic layer data and the bearing section data, for a certain bearing section, if the corresponding underlying basic layer data overlaps or intersects with the bearing section data, it is determined that the bearing section route may be incorrect data entered during construction and is marked.

[0094] Step S600 Map Display: For all possible carrier segments to pass through, match the carrier segment data with the optical path data, synchronously display the carrier segment data that passes the match on the map, and infer whether there is a scenario of same trench and same cable in the existing network.

[0095] In the transmission network, after the design project approval of the optical cable segment is completed, it enters the optical cable construction stage. During the construction process, there are various operation modes for the optical cable, and at the same time, the optical cable is in various complex external environments, such as buried underground, in pipeline segments constructed by cement and stone materials, pole road segments erected on overhead poles on the ground, directly buried segments directly buried underground, wall-mounted segments hung on walls or under viaducts, etc. Each laying operation mode has different external influencing factors. Usually, an optical cable segment may be erected through 1 - 2 laying methods, but after cutover, relocation, and fault repair, the optical cable may be constructed through multiple laying methods.

[0096] The measurement principle of the coherent optical time domain reflectometer is based on the principle of optical frequency heterodyne detection. It divides the optical signal into two paths, one path serves as the local signal, that is, the signal light, and the other path is injected into the optical fiber under test, that is, the reference light, after changing the frequency through an acousto-optic modulator. The backscattered signal in the optical fiber is mixed with the local signal and then enters the photodetector. The two optical signal fields are coherently superposed, and the generated photocurrent contains the DC component of the local signal and the AC component of the difference frequency between the backscattered signal and the local signal. When we inject the optical signal into the main and standby optical fibers of the optical path respectively, when the coherent light has the same frequency, the same direction, and the same phase difference, different vibration patterns will be generated when passing through different carrier routes and different external environmental influences. However, when passing through the same carrier and the same external environment, according to the coherent characteristics of the coherent light, when the coherent light overlaps with each other, a stable phase difference can be generated, forming a relatively continuous coherent length. The coherent length of a single-mode optical fiber can range from several hundred meters to several kilometers.

[0097] Calculate the optical cable length information (unit: m) from the time node information of the appearance of the optical propagation fringe to the machine room, and estimate the carrier segment information (the carrier segment includes pipeline segment, pole road segment, directly buried segment, wall-mounted segment, and lead-up segment) that may have the same carrier route in combination with the road network structure. Each carrier segment is uniformly set according to the external environment. For example, pipeline direct burial is mostly in the underground environment, and overhead wall-mounted is mostly in the external space environment. Synchronously consider the influence of external force factors such as trains and construction, and obtain the carrier route length of the same trench and same cable after multi-dimensional analysis and calculation.

[0098] Finally, use the carrier segment obtained from the estimated position through the optical cable length in the existing network resources to match with the analysis result and present it in GIS to improve the analysis accuracy.

[0099] Embodiment 2:

[0100] An optical cable same-ditch and same-cable detection system based on coherent optical detection technology of the present invention includes an optical path data acquisition module, a layer data acquisition module, a coherent length calculation module, a coherent event analysis module, a bearing section analysis module, and a map display module.

[0101] The optical path data acquisition module is used to perform the following operations: For the optical transmission network to be analyzed, obtain optical path data, which is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, physical attributes of the optical cable, logical attributes of the optical path, and network resource information.

[0102] The layer data acquisition module is used to perform the following operations: For the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community surfaces.

[0103] The coherent length calculation module is used to perform the following operations: Connect a coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherent length based on the waveform diagram.

[0104] As a specific implementation of the coherent length calculation module, this module is used to perform the following operations:

[0105] (1) Connect a coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal;

[0106] (2) Divide the optical signal into two paths. One path is used as the local signal, and the other path is used as the reference light after changing the frequency through an acousto-optic modulator and injected into the optical fiber to be measured. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram;

[0107] (3) Obtain the waveform diagram of the coherent light in the optical fiber through the coherent optical reflectometer. The waveform diagram reflects the phase change situation of the optical signal when propagating in the optical fiber;

[0108] (4) Extract the coherent length from the waveform diagram. The calculation formula for the coherent length L is:

[0109] L = λ 2 / Δλ,

[0110] where λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

[0111] The coherent event analysis module is used to perform the following operations: Combine multiple consecutive coherent lengths into one coherent event to obtain multiple coherent events. Each coherent event represents a continuous bearing section, number and mark the coherent events, and calculate the coherent length of each coherent event.

[0112] As a specific implementation of the coherent event analysis module, when calculating the coherent length of a coherent event, for the coherent event numbered M1, the corresponding coherent length L1 is expressed by the calculation formula: L1 = T * c, where T represents the co-frequency time of coherent light, and c represents the propagation speed of the optical signal in the optical cable.

[0113] The bearer segment analysis module is used to perform the following operations: analyze each coherent event. When analyzing, based on the coherent length of the coherent event, obtain the possible bearer segment data that may pass through. For each possible bearer segment, based on the ratio between the bearer segment length and the coherent length of the coherent event, perform screening, classify the types of the bearer segments that meet the screening conditions, and perform overlay analysis and marking on the bearer segments based on the underlying basic layer data and the bearer segment data. After analyzing all coherent events, record all the possible bearer segment data that may pass through.

[0114] For the k-th coherent event, the bearer segment analysis module is used to perform the following operations for analysis:

[0115] (1) For the coherent event to be analyzed, according to the event of the optical fiber reaching the coherent event, recursively query the fiber core information connected to the optical fiber through pigtail and fusion splicing actions in the asset management system;

[0116] (2) According to the coherent length of the coherent event, obtain the possible bearer segment data that may pass through;

[0117] (3) For each possible bearer segment, compare and analyze the bearer segment length R with the coherent length Lk of the coherent event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearer segment meets the screening conditions, and classify the types of the bearer segments that meet the screening conditions. The types of the bearer segments include duct segments, pole line segments, directly buried segments, wall-mounted segments, and lead-in segments.

[0118] When performing overlay analysis and marking on the bearer segments based on the underlying basic layer data and the bearer segment data, for a certain bearer segment, if the corresponding underlying basic layer data overlaps or intersects with the bearer segment data, it is determined that the bearer segment route may be incorrect data entered during construction and is marked.

[0119] The map display module is used to perform the following operations: for all possible bearer segments, match the bearer segment data with the optical path data, synchronously display the bearer segment data that passes the match on the map, and infer whether there is a same-ditch and same-cable scenario in the existing network.

[0120] The system of this embodiment can implement the detection and analysis of the same-ditch and same-cable of the optical cable by executing the method disclosed in Embodiment 1.

[0121] The above has introduced in detail the optical cable co-laying and co-cabling detection method and system based on the correlation optical detection technology provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for detecting optical cables in the same trench and with the same cable based on correlation optical detection technology, characterized in that, It includes the following steps: Optical path data acquisition: For the optical transmission network to be analyzed, obtain the optical path data, which is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, physical attributes of the optical cable, logical attributes of the optical path, and network resource information of the optical path; Layer data acquisition: For the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community areas; Coherence length calculation: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherence length based on the waveform diagram; Coherence event analysis: Combine multiple consecutive coherence lengths into one coherence event to obtain multiple coherence events. Each coherence event represents a continuous bearing section. Number and mark each coherence event, and calculate the coherence length of each coherence event; Bearing section analysis: Analyze each coherence event. During the analysis, based on the coherence length of the coherence event, obtain the possible bearing section data passed. For each possible bearing section passed, screen based on the ratio between the bearing section length and the coherence length of the coherence event, classify the types of the bearing sections that meet the screening conditions, and perform overlay analysis and marking on the bearing sections based on the underlying basic layer data and the bearing section data. After analyzing all coherence events, record all possible bearing section data passed; Map display: For all possible bearing sections passed, match the bearing section data with the optical path data, synchronously display the passed bearing section data on the map, and infer whether there is a scenario of same trench and same cable in the existing network.

2. The method for detecting optical cables in the same trench and with the same cable based on the coherent optical detection technology according to claim 1, wherein The coherence length calculation includes the following steps: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal; Split the optical signal into two paths. One path serves as the local signal, and the other path passes through the acousto-optic modulator to change the frequency and then serves as the reference light and is injected into the optical fiber to be measured. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram; Obtain the waveform diagram of the coherent light in the optical fiber through the coherent optical reflectometer. The waveform diagram reflects the phase change situation of the optical signal during propagation in the optical fiber; Extract the coherence length from the waveform diagram. The calculation formula for the coherence length L is: L = λ 2 / Δλ, where λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

3. The method for detecting optical cables in the same trench and same cable based on the relevant optical detection technology according to claim 1, characterized in that, When calculating the coherence length of the coherence event, for the coherence event numbered M1, the corresponding coherence length L1 is expressed by the calculation formula as: L1 = T * c, where T represents the co-frequency time of the coherent light, and c represents the propagation speed of the optical signal in the optical cable.

4. The method for detecting optical cables in the same trench and with the same cable based on the coherent optical detection technology according to claim 1, wherein For the k-th coherence event, the bearing section analysis includes the following steps: For the coherence event to be analyzed, according to the event of the optical fiber reaching the coherence event, recursively query the fiber core information connected to the optical fiber through pigtail and fusion splicing operations in the asset management system; Obtain the possible bearing section data passed according to the coherence length of the coherence event; For each possible bearing segment, compare and analyze the bearing segment length R with the coherence length Lk of the coherence event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearing segment meets the screening conditions, and the bearing segments that meet the screening conditions are classified by type. The types of bearing segments include pipeline segments, pole line segments, directly buried segments, wall-mounted segments, and lead-in segments.

5. The method for detecting optical cables in the same trench and with the same cable based on the relevant optical detection technology according to claim 1, wherein When performing overlay analysis and marking on the bearing segment based on the underlying basic layer data and the bearing segment data, for a certain bearing segment, if the corresponding underlying basic layer data overlaps or intersects with the bearing segment data, it is determined that the bearing segment route may be incorrect data entered during construction and is marked.

6. An optical cable same-ditch and same-cable detection system based on correlation optical detection technology, characterized in that It includes an optical path data acquisition module, a layer data acquisition module, a coherence length calculation module, a coherence event analysis module, a bearing segment analysis module, and a map display module; The optical path data acquisition module is used to perform the following operations: For the optical transmission network to be analyzed, obtain the optical path data, which is used to describe the transmission path and related attributes of the optical signal in the optical transmission network, including the starting point information, ending point information, intermediate node information, optical cable physical attributes, optical path logical attributes, and network resource information of the optical path; The layer data acquisition module is used to perform the following operations: For the optical transmission network to be analyzed, obtain the underlying basic layer data related to geographical information, including information related to roads and community surfaces; The coherence length calculation module is used to perform the following operations: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path, obtain the waveform diagram of the coherent light through the principle of optical frequency heterodyne detection, and calculate the coherence length based on the waveform diagram; The coherence event analysis module is used to perform the following operations: Combine multiple consecutive coherence lengths into one coherence event to obtain multiple coherence events. Each coherence event represents a continuous bearing segment. Number and mark the coherence events, and calculate the coherence length of each coherence event; The bearing segment analysis module is used to perform the following operations: Analyze each coherence event. During the analysis, obtain the possible bearing segment data based on the coherence length of the coherence event. For each possible bearing segment, perform screening based on the ratio between the bearing segment length and the coherence length of the coherence event, classify the bearing segments that meet the screening conditions by type, and perform overlay analysis and marking on the bearing segments based on the underlying basic layer data and the bearing segment data. After analyzing all coherence events, record all possible bearing segment data; The map display module is used to perform the following operations: For all possible bearing segments, match the bearing segment data with the optical path data, synchronously display the matched bearing segment data on the map, and infer whether there is a same-ditch and same-cable scenario in the existing network.

7. The optical cable co-laying and co-cabling detection system based on the correlation optical detection technology according to claim 6, wherein The coherence length calculation module is used to perform the following operations: Connect the coherent optical reflectometer to the optical fiber at one end of the optical path and emit an optical signal; Split the optical signal into two paths. One path is used as the local signal, and the other path is used as the reference light after changing the frequency through the acousto-optic modulator and is injected into the optical fiber to be measured. When the local signal and the reference light meet in the optical fiber, an interference effect is generated to form a detectable waveform diagram; Obtain the waveform diagram of the coherent light in the optical fiber through a coherent optical reflectometer. The waveform diagram reflects the phase change of the optical signal during its propagation in the optical fiber; Extract the coherent length from the waveform diagram. The calculation formula for the coherent length L is: L = λ 2 / Δλ, where, λ represents the wavelength of the light wave, and Δλ represents the wavelength change amount.

8. The optical cable co-laying and co-cabling detection system based on the correlation optical detection technology according to claim 6, wherein When calculating the coherent length of the coherent event, for the coherent event numbered M1, the corresponding coherent length L1 is expressed by the calculation formula as: L1 = T * c, where, T represents the co-frequency time of the coherent light, and c represents the propagation speed of the optical signal in the optical cable.

9. The optical cable co-laying and co-cabling detection system based on the correlation optical detection technology according to claim 6, characterized in that, For the k-th coherent event, the bearer segment analysis module is used to perform the following operations: For the coherent event to be analyzed, according to the event of the optical fiber reaching the coherent event, recursively query the optical fiber core information connected to the optical fiber through pigtail and fusion splicing actions in the asset management system; Obtain the possible bearer segment data according to the coherent length of the coherent event; For each possible bearer segment, compare and analyze the bearer segment length R with the coherent length Lk of the coherent event. If 0.9Lk ≤ R ≤ 1.1Lk is satisfied, it is determined that the bearer segment meets the screening conditions, and the bearer segments that meet the screening conditions are classified by type. The types of the bearer segments include duct segments, pole segments, directly buried segments, wall-mounted segments, and lead-in segments.

10. The optical cable co-laying and co-cabling detection system based on the correlation optical detection technology according to claim 6, characterized in that, When performing overlay analysis and marking on the bearer segment based on the underlying basic layer data and the bearer segment data, for a certain bearer segment, if the corresponding underlying basic layer data overlaps or intersects with the bearer segment data, it is determined that the bearer segment route may be incorrect data entered during construction and is marked.

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