Optical Cable Security Intelligent Operation and Maintenance System and Its Control Method, Equipment, Storage Medium

Abstract

An embodiment of the present invention discloses an intelligent operation and maintenance system for optical cable security, its control method, device, and storage medium. The system includes an intelligent operation and maintenance device for optical cable security and a network management platform. The intelligent operation and maintenance device for optical cable security includes a detection optical cable, an optical signal demodulation device, and a signal processing host. By setting the intelligent operation and maintenance device for optical cable security at the local end, the optical signal demodulation device is made to cooperate with the detection optical cable to sense the vibration generated when the optical cable is damaged, and the monitoring data including the positioning and category of external vibration sensing events is analyzed, and the alarm information is sent in a timely and effective manner in cooperation with the network management platform. On the one hand, a vibration early warning system is built, truly realizing the intellectualization of pipeline operation and maintenance and the real-time monitoring of the optical cable along the line. On the other hand, stable, timely, and complete vibration feedback can be obtained through the detection optical cable with low cost, which has economy. It can be used to solve the problems of high cost, poor stability, and poor timeliness existing in the current intelligent operation and maintenance system for optical cable security.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensing, and particularly to an intelligent operation and maintenance system and method for optical cable security. Background Art

[0002] Important civil and military long-distance optical cables and transmission facilities are extremely vulnerable to human damage without effective supervision. During the operation process, faults occur frequently, and the fault types, locations, and times are difficult to predict, resulting in economic losses. Therefore, it is necessary to conduct real-time monitoring along the optical cable.

[0003] However, the existing systems for optical cable safety monitoring often have problems such as high cost, poor stability, and poor timeliness. In view of the problems of high cost, poor stability, and poor timeliness existing in the current intelligent operation and maintenance system for optical cable security, it is necessary to conduct further research on the intelligent operation and maintenance technology for optical cable security. Summary of the Invention

[0004] Embodiments of the present invention provide an intelligent operation and maintenance system and method for optical cable security to solve the problems of high cost, poor stability, and poor timeliness existing in the current intelligent operation and maintenance system for optical cable security.

[0005] On the one hand, the present invention provides an intelligent operation and maintenance system for optical cable security, including an intelligent operation and maintenance device for optical cable security and a network management platform. The intelligent operation and maintenance device for optical cable security is installed at the local end and includes a detection optical cable, an optical signal demodulation device, and a signal processing host;

[0006] The detection optical cable is a common single-mode communication optical fiber or a spare fiber core of the optical cable to be monitored;

[0007] The optical signal demodulation device is used for: generating a first optical pulse signal and injecting it into the detection optical cable. The first optical pulse signal generates Rayleigh scattering during the transmission along the optical cable and returns along the optical cable to form a second pulse signal; demodulating the second optical pulse signal by phase to obtain the action signal of the acoustic wave and external vibration sensing on the optical fiber, and converting it into a digital electrical signal;

[0008] The signal processing host is used for: analyzing the digital electrical signal based on the training data model and determining the location of the external vibration sensing event through the optical time domain reflectometry principle to obtain the monitoring data; the training data model is obtained based on the photoelastic effect and a large amount of data training and is used to identify the vibration category of the external vibration sensing event;

[0009] The network management platform is used for: acquiring the monitoring data and presenting the operation status of the optical cable network in real time according to the monitoring data; when the monitoring signal includes an external vibration sensing event, sending an alarm message based on the geographic information system, and the alarm message includes the vibration category, vibration time, and vibration location of the external vibration sensing event.

[0010] Furthermore, the training process of the training data model includes: constructing different types of event databases based on the signals collected at each spatial point; converting the signal samples into the feature vectors and feature vector sequences required for training the Hidden Markov Model through multi-domain feature extraction of the short-time units in each signal sample; offline training the Hidden Markov Model of typical events and forming the event Hidden Markov Model at this point to obtain the training data model;

[0011] The signal processing host is also used for: during online recognition, calculating the output probabilities of the test signal input into each event model according to the model matching idea, and analyzing the frequency domain characteristics, time domain characteristics and phase characteristics of the digital electrical signal based on the training data model to obtain the vibration categories of the external vibration sensing events, and the vibration categories include manual excavation, vehicle rolling and mechanical construction;

[0012] If the observation sequence of the digital electrical signal is 0 and its corresponding output probability is P(0|λ), then:

[0013]

[0014] Where λ is the parameter of the Hidden Markov Model, λ=(A, B, π), π represents the initial probability distribution, A represents the state transition probability distribution, and B represents the observation probability distribution;

[0015] The event type is c = index{max(P1, P2, P3)}; the optimal path output of the parameter λ of the Hidden Markov Model is path = [q1, q2, q3], and the calculation method of the Q function is:

[0016]

[0017] Where λ is the current estimated value of the parameter of the Hidden Markov Model.

[0018] Furthermore, the optical signal demodulation device is also used for:

[0019] Generating a continuous coherent optical signal based on an ultra-narrow linewidth laser, modulating it into an optical pulse signal by an acousto-optic modulator, and intensively amplifying it by an erbium-doped fiber amplifier to obtain a first optical pulse signal; the first optical pulse signal is sequentially injected into the detection optical cable through an isolator, port 1 and port 2 of a circulator;

[0020] Rayleigh scattering occurs during the transmission of the first optical pulse signal along the optical cable, and its backward Rayleigh scattered optical signal returns along the optical cable, is received by port 2 and port 3 of the circulator, and then after the noise signal is filtered by an optical filter and coupled by a first coupler, it is injected into an unbalanced Mach-Zehnder interferometer, and three external disturbance signals with a phase difference of 120° are output by a 3×3 second coupler to obtain a second optical pulse signal;

[0021] The introduced phase change information is used to obtain the acoustic wave and the action signal of the external vibration sensing on the optical fiber through phase demodulation of the second optical pulse signal, and is converted into an electrical signal by photoelectric detection, and then synchronously acquired by the synchronous trigger analog-to-digital converter controlled by the waveform generation card to obtain a digital electrical signal.

[0022] Furthermore, the network management platform is also used for:

[0023] Managing geographical resources by region, where the geographical resources include the optical cable segments of the monitored optical cable and the geographical nodes passed by.

[0024] Furthermore, the network management platform is also used for:

[0025] Managing external vibration sensing events, screening and viewing external vibration sensing events based on vibration time and vibration category, and controlling the false alarm times of alarm information within ≤10% of the total alarms.

[0026] Furthermore, the network management platform is also used for:

[0027] Conducting curve tests and event analysis on external vibration sensing events to obtain test curves, where the optical cable segments of the test curves correspond to the actual optical cable resources;

[0028] Automatically displaying the relevant optical cable segments associated with the test curves according to the fiber jump configuration of the optical path, and synchronously displaying the specific geographical locations of the optical cables corresponding to the points on the test curves on the map interface by moving the coordinates on the test curves.

[0029] Furthermore, the network management platform is also used for:

[0030] Adjusting the optical fiber average loss threshold, reflection event height threshold, non-reflection event attenuation threshold, and end height threshold, and directly analyzing the already tested curves after adjustment; Reflection events include: the jump points of the optical cable (i.e., the jump points connected by flange plates), the break points of the optical cable, and the end points of the optical cable; Non-reflection events include: the fusion points of the optical cable and the over-bending points.

[0031] Furthermore, the network management platform is also used for:

[0032] Obtaining reflection event points or non-reflection event points and adding them to the test curves.

[0033] An embodiment of the present invention provides an optical cable security intelligent operation and maintenance system and method to solve the problems of high cost, poor stability and timeliness existing in the current optical cable security intelligent operation and maintenance system. The object of the present invention is to provide an optical cable security intelligent operation and maintenance system, including an optical cable security intelligent operation and maintenance device and a network management platform. The optical cable security intelligent operation and maintenance device is installed at the local end. The optical cable security intelligent operation and maintenance device includes a detection optical cable, an optical signal demodulation device and a signal processing host; the detection optical cable is an ordinary single-mode communication optical fiber or a spare core of the optical cable to be monitored; the optical signal demodulation device is used for: generating a first optical pulse signal and injecting it into the detection optical cable. The first optical pulse signal generates Rayleigh scattering during the transmission along the optical cable and returns along the optical cable to form a second pulse signal; demodulating the second optical pulse signal by phase to obtain the action signal of the acoustic wave and the external vibration sensing on the optical fiber, and converting it into a digital electrical signal; the signal processing host is used for: analyzing the digital electrical signal based on the training data model, and determining the location of the external vibration sensing event through the optical time domain reflectometry principle to obtain monitoring data; the training data model is obtained based on the photoelastic effect and a large amount of data training, and is used to distinguish the vibration category of the external vibration sensing event; the network management platform is used for: obtaining the monitoring data and presenting the operation state of the optical cable network in real time according to the monitoring data; when the monitoring signal includes an external vibration sensing event, sending an alarm message based on the geographic information system, and the alarm message includes the vibration category, vibration time and vibration location of the external vibration sensing.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] By setting the optical cable security intelligent operation and maintenance device at the local end, the optical signal demodulation device is coordinated with the detection optical cable to sense the vibration generated when the optical cable is damaged, and the monitoring data including the location and category of the external vibration sensing is analyzed. Cooperating with the network management platform to send alarm information in a timely and effective manner, on the one hand, an optical cable security early warning system is constructed, which combines advanced AI algorithms with existing operation and maintenance operations and safety management to truly realize the intelligentization of pipeline operation and maintenance and the real-time monitoring of the optical cable line. On the other hand, a stable, timely and complete optical fiber sensing vibration feedback can be obtained by simply setting a low-cost detection optical cable at one end, without the need to add sensors to the optical cable or reflectors at the end. Single-end deployment is more convenient and economical. Therefore, it can be used to solve the problems of high cost, poor stability and timeliness existing in the current optical cable security intelligent operation and maintenance system.

[0036] On the other hand, the present invention provides an optical cable security intelligent operation and maintenance method, which adopts the above optical cable security intelligent operation and maintenance system, including:

[0037] Generate a first optical pulse signal and inject it into the detection optical cable. During the transmission of the first optical pulse signal along the optical cable, Rayleigh scattering occurs and a second pulse signal is formed as it returns along the optical cable. Demodulate the phase of the second optical pulse signal to obtain the action signals of acoustic waves and external vibrations on the optical fiber, and convert them into digital electrical signals.

[0038] Analyze the digital electrical signals based on the training data model, and determine the location of external vibration sensing events through the optical time domain reflectometry principle to obtain monitoring data. The training data model is obtained based on the photoelastic effect and a large amount of data training, and is used to distinguish the vibration categories of external vibration sensing events.

[0039] Obtain the monitoring data and present the operating status of the optical cable network in real time according to the monitoring data. When the monitoring signal includes an external vibration sensing event, send an alarm message based on the geographic information system. The alarm message includes the vibration category, time, and location of the external vibration sensing event.

[0040] On the other hand, the present invention provides a control device for an optical cable security intelligent operation and maintenance system. The control device for the optical cable security intelligent operation and maintenance system includes: a memory and at least one processor. Instructions are stored in the memory, and the memory and at least one processor are interconnected by a line. The at least one processor calls the instructions in the memory to enable the control device for the optical cable security intelligent operation and maintenance system to execute each step of the control method for the optical cable security intelligent operation and maintenance system as described above.

[0041] On yet another hand, the present invention provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it can implement the method as described above. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description 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.

[0043] Figure 1 It is a schematic diagram of an optical cable security intelligent operation and maintenance system according to an embodiment of the present invention.

[0044] Figure 2 It is a frequency-domain characteristic analysis curve of a digital electrical signal according to an embodiment of the present invention.

[0045] Figure 3 It is a time-domain characteristic analysis curve of a digital electrical signal according to an embodiment of the present invention.

[0046] Figure 4It is the phase characteristic analysis curve of the digital electrical signal in an embodiment of the present invention.

[0047] Figure 5 It is the signal graph manually excavated in an embodiment of the present invention.

[0048] Figure 6 It is the signal graph of mechanical construction in an embodiment of the present invention.

[0049] Figure 7 It is the flowchart of the optical cable safety monitoring method in another embodiment of the present invention. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] Please refer to Figure 1 , the optical cable security intelligent operation and maintenance system 10 in an embodiment of the present invention includes an optical cable security intelligent operation and maintenance device 11 and a network management platform 12. The optical cable security intelligent operation and maintenance device 11 is installed at the local end. The optical cable security intelligent operation and maintenance device 11 includes a detection optical cable 111, an optical signal demodulation device 112, and a signal processing host 113.

[0052] The detection optical cable 111 is an ordinary single-mode communication optical fiber or the spare fiber core of the optical cable to be monitored.

[0053] The optical signal demodulation device 112 is used for: generating a first optical pulse signal and injecting it into the detection optical cable 111. The first optical pulse signal generates Rayleigh scattering during the transmission along the optical cable and returns along the optical cable to form a second pulse signal; demodulating the second optical pulse signal by phase to obtain the action signal of sound waves and vibrations on the optical fiber and converting it into a digital electrical signal.

[0054] The signal processing host 113 is used for: analyzing the digital electrical signal based on the training data model and determining the location of the external vibration sensing event through the optical time domain reflectometry principle to obtain monitoring data; the training data model is obtained based on the photoelastic effect and a large amount of data training and is used to distinguish the vibration categories of external vibration sensing events.

[0055] The network management platform 12 is used for: obtaining the monitoring data and presenting the running state of the optical cable network in real time according to the monitoring data; when the monitoring signal includes an external vibration sensing event, sending an alarm message based on the geographic information system. The alarm message includes the vibration category, vibration time, and vibration location of the external vibration sensing.

[0056] In the embodiment of the present invention, the optical cable security intelligent operation and maintenance system consists of hardware and a visualization display part: The optical cable security intelligent operation and maintenance device 11 detects the main service optical fiber network, and the network management platform 12 (visualization display part) presents the operation status of the optical cable network in real time; data communication between the software and hardware is carried out through an Ethernet switch.

[0057] For example: According to actual requirements, a total of 8 monitoring routes can be set. The software system supporting network management server is installed in the core computer room; the network management client is installed at the monitoring room location; other locations can be accessed through authorization. The hardware is installed on the rack in the optical cable distribution room computer room. The vibration detection implementation method is based on the time-domain backscattering of OTDR. When necessary, advanced technical means such as sensing can be combined. Both active and passive devices are installed at the local end, and no devices are deployed at the opposite end. The detection distance of this device can reach 45 km, and it can accurately locate the position of the damage event, and can realize simultaneous monitoring of multiple points and multiple events without mutual influence. The system can directly use standard communication optical cables according to the environmental configuration. The monitoring area is divided according to the site and the background mode is recognized. After pattern analysis, the type of third-party damage event can be accurately determined.

[0058] In the embodiment of the present invention, by utilizing the characteristic that optical fibers are sensitive to vibration, combined with the backend analysis processing and intelligent recognition related technologies, the system analysis algorithm integrates the data and classifies, cleans, and converts it to form a training data model for distinguishing different vibration sources (such as construction excavation, man-made damage, vehicles, etc.). Due to the elasto-optic effect, the refractive index and length of the optical fiber will have slight changes, and the vibration causes a phase change of the transmitted signal in the optical fiber, resulting in a change in the light intensity. Finally, the system can give an early warning or a real-time alarm.

[0059] As one of the implementation methods, the training process of the training data model includes: constructing different types of event databases based on the signals collected at each spatial point; through the multi-domain feature extraction of the short-time units in each signal sample, converting the signal sample into the feature vector and feature vector sequence required for training the hidden Markov model; offline training the hidden Markov model of typical events and forming the event hidden Markov model of this point to obtain the training data model.

[0060] The signal processing host 113 is also used for: analyzing the frequency-domain characteristics, time-domain characteristics, and phase characteristics of the digital electrical signal based on the training data model to obtain the vibration category of the external vibration sensing event, and the vibration category includes manual excavation, vehicle rolling, and mechanical construction. The frequency-domain characteristic analysis curve of the digital electrical signal can be seen in Figure 2 ; the time-domain characteristic analysis curve can be seen in Figure 3 ; the phase characteristic analysis curve can be seen in Figure 4 . Figure 5 It is the signal graph for manual excavation, Figure 6Signal graphics for mechanical construction. In addition, after comprehensive judgment, the external damage activities detected within 15 meters can be classified and alarmed. For example: 0 to 5m is a level I alarm (manual excavation), 5 to 10m is a level II alarm (vehicle rolling), and 10 to 15m is a level III alarm (mechanical construction).

[0061] Among them, if the observed sequence of the digital electrical signal is 0 and its corresponding output probability is P(0|λ), then:

[0062]

[0063] Among them, λ is the parameter of the hidden Markov model, λ = (A, B, π), π represents the initial probability distribution, A represents the state transition probability distribution, and B represents the observation probability distribution;

[0064] The event type is c = index{max(P1, P2, P3)}; the optimal path output of the parameter λ of the hidden Markov model is path = [q1, q2, q3], and the calculation method of the Q function is:

[0065]

[0066] Among them, λ is the current estimated value of the parameter of the hidden Markov model.

[0067] In the embodiment of the present invention, fiber optic vibration sensing monitoring utilizes the vibration-sensitive characteristics of the detection optical cable 111. When an external vibration acts on the detection optical cable 111, due to the elasto-optic effect, the refractive index and length of the optical fiber will change slightly, resulting in a change in the phase of the signal transmitted in the optical fiber and causing a change in the light intensity. The device usually uses a highly coherent pulsed light source, and interference will occur between the Rayleigh scattering signals within the pulse width region. When the external vibration causes a phase change, the intensity of the coherent Rayleigh scattering signal at this point will change. By detecting the phase information of the Rayleigh scattering optical signals before and after vibration and combining with the 0TDR positioning algorithm for precise positioning, the detection of external vibration sensing events can be achieved.

[0068] As one of the implementation methods, the optical signal demodulation device 112 is also used for:

[0069] Generating a continuous coherent optical signal based on an ultra-narrow linewidth laser, modulating it into an optical pulse signal by an acousto-optic modulator, and centrally amplifying it by an erbium-doped fiber amplifier to obtain a first optical pulse signal; the first optical pulse signal is sequentially injected into the detection optical cable 111 through an isolator, port 1 of a circulator, and port 2;

[0070] The first optical pulse signal generates Rayleigh scattering during the transmission along the optical cable. The backscattered Rayleigh optical signal returns along the optical cable and is received by ports 2 and 3 of the circulator. After the noise signal is filtered by the optical filter, it is coupled by the first coupler and then injected into an unbalanced Mach-Zehnder interferometer. Three external disturbance signals with a phase difference of 120° are output by the 3×3 second coupler to obtain the second optical pulse signal.

[0071] The introduced phase change information is used to obtain the action signals of sound waves and vibrations on the optical fiber by phase demodulating the second optical pulse signal, and is converted into an electrical signal by photoelectric detection. Then, the signal is synchronously acquired by the synchronous trigger analog-to-digital converter controlled by the waveform generation card to obtain a digital electrical signal.

[0072] Specifically, the detection optical cable 111 usually uses ordinary single-mode communication optical fiber, which is generally laid underground along pipelines, transmission cables, and urban roads, or the spare fiber cores of the communication optical cable laid along pipelines or roads can also be directly used. The optical signal demodulation device 112 is the core of the system, and its internal components mainly include two categories: optical devices and electrical devices. A continuous coherent optical signal is generated by an ultra-narrow linewidth laser and modulated into an optical pulse signal by an acousto-optic modulator (AOM); the optical pulse signal is intensively amplified by an erbium-doped fiber amplifier (EDFA). The amplified optical pulse signal (i.e., the first optical pulse signal) is sequentially injected into the detection optical cable 111 through an isolator and port 1 and port 2 of the circulator; the optical pulse signal generates Rayleigh scattering during the transmission along the optical cable. The backscattered Rayleigh optical signal returns along the optical cable and is received by ports 2 and 3 of the circulator (the second optical pulse signal). After the noise signal is filtered by the optical filter, it is coupled by the first coupler and then injected into an unbalanced Mach-Zehnder interferometer (MZI). Three external disturbance signals with a phase difference of 120° are output by the 3×3 second coupler. The introduced phase change information is used to obtain the action signals of sound waves and vibrations on the optical fiber by phase demodulation. The demodulated optical signal is converted into an electrical signal by photoelectric detection (PD), and then the signal is synchronously acquired by the synchronous trigger analog-to-digital (A / D) converter controlled by the waveform generation card. The digital electrical signal is transmitted to the signal processing host 113 in real time through interfaces such as a network. The signal processing host 113 is an ordinary computer host (PC) or an embedded main board, which is used for the analysis and processing of optical fiber detection signals. The event information causing sound waves and vibrations is obtained through specific signal processing algorithms, its position is determined by the optical time domain reflectometry principle, and the detected events are intelligently identified and classified.

[0073] As one of the implementation methods, the network management platform 12 is also used for:

[0074] Managing geographical resources by region, where the geographical resources include the optical cable segments of the monitored optical cable and the geographical nodes passed through.

[0075] Manage external vibration sensing events, filter and view external vibration sensing events based on vibration time and vibration type, and control the false alarm times of alarm information within ≤10% of the total alarms.

[0076] Conduct curve tests and event analyses on external vibration sensing events to obtain test curves, and the optical cable segments of the test curves correspond to actual optical cable resources;

[0077] Automatically display the relevant optical cable segments associated with the test curves according to the fiber jump configuration of the optical path, and by moving the coordinates on the test curve, synchronously display the specific geographical locations of the optical cables corresponding to the points on the test curve on the map interface.

[0078] Adjust the average optical fiber loss threshold, reflection event height threshold, non-reflection event attenuation threshold, and end height threshold, and directly analyze the already tested curves after adjustment; Reflection events include: optical cable jump points (i.e., jump points connected by flange plates), optical cable break points, and optical cable end points; Non-reflection events include: optical cable fusion points and excessive bending points.

[0079] Obtain reflection event points or non-reflection event points and add them to the test curve.

[0080] Specifically, on the one hand, the network management platform can achieve visual display, that is, provide an intuitive real-time dynamic display of the route, a visual display interface, and map the fiber position to the image through the graphic configuration module.

[0081] On the other hand, in order to accurately provide the geographical location of the optical fiber fault point, the system manages resources such as the monitored optical cable and the geographical nodes it passes through. The resources mainly include station sites, optical cable segments, optical cable landmarks, equipment, etc. The system supports batch import and export of resources in Excel format.

[0082] (1) Area management: Sub-areas can be established according to resource attributes for resource partition management.

[0083] (2) Station site management: Station site information includes end office sites, relay stations, monitoring stations, and important optical cable joint points, fusion points, etc.

[0084] (3) Landmark management: Optical cable landmarks mainly include wells, poles, handholes, marker stones, joint boxes, reference landmarks, etc. The optical cable length and winding information from each landmark point to the previous landmark point can be edited and modified.

[0085] (4) Optical cable management: Includes information such as optical cable length and core count. Details of resources also include the management of core information and pigtail information of this optical cable segment.

[0086] On the other hand, the system has alarm event management, which can filter and view conditions such as different times and different types, and can control the number of vibration false alarms within ≤10% of the total alarms.

[0087] On yet another hand, the system can also analyze the performance of optical fibers, specifically including: the system can regularly analyze the performance of the optical cable cores (including optical fiber loss, length, etc.); curve test and event analysis functions; adjusting basic measurement parameters; being able to adjust the OTDR range, pulse width, average number, and refractive index of the optical fiber; adjusting basic event analysis parameters; being able to adjust the average loss threshold of the optical fiber, the height threshold of the reflection event, the attenuation threshold of the non-reflection event, and the ending height threshold. After adjusting the analysis parameters, it is possible to directly analyze the already tested curve without having to retest (wherein, basic reflection events include: the jump points of the optical cable (i.e., the jump points connected by flange plates), the break points of the optical cable, and the end points of the optical cable. Basic non-reflection events include: the fusion points of the optical cable and the over-bending points); it is possible to add reflection and non-reflection event points that the system cannot automatically identify according to the curve condition, and the name of the event point can be manually edited to make the curve display more intuitive. The main event points can be identified by the site name or the machine room name; adjusting basic alarm threshold parameters; being able to adjust the fiber break alarm threshold, as well as the main and secondary alarm thresholds of the joint attenuation. This threshold adjustment is for each test route, and different test routes can set reasonable alarm parameter values that suit their own situations according to the specific conditions of the optical fiber line; matching the optical cable segments of the test curve with the actual optical cable resources; the system will automatically display the relevant optical cable segments associated with the test curve according to the fiber jump configuration of the optical path. It is possible to select the actual optical cable segment corresponding to the curve between two event points through fiber matching. After the curve between the event points is matched with the optical cable segment, when an alarm occurs, it is possible to specifically locate to the corresponding geographical location on the map, and more importantly, by moving the coordinates on the curve, the specific geographical location of the optical cable corresponding to the points on the curve can be synchronously displayed on the map interface; comparing the test curve with the reference curve, and comparing multiple test curves; the system named test curve, regular test curve, and fault test curve can all be compared with the reference curve, and it is also possible to compare multiple curves tested at different times on the same route. An intuitive comparison display is made through the up and down displacement of the curves.

[0088] In addition, the system also supports the route calibration of the stand-alone geographic information system, that is, the geographic information system can be updated regularly for free, supports user-editable route calibration, can also provide an open protocol for the later compatibility of the monitoring system, and also has security management and log management functions.

[0089] Among them, the purpose of security management is to ensure the security of the system, prevent the intrusion of unauthorized users, complete security control and intrusion recovery tasks, and divide the permissions and management scopes of different users according to business needs.

[0090] User management includes:

[0091] (1) System administrator, who has full authority and management scope.

[0092] (2) System Operator, who has full operational authority within the designated area but has no authority outside the designated area.

[0093] (3) System monitor: This user has the authority to browse information only in the specified area and cannot browse information outside the specified area, nor can he make changes to the system.

[0094] Role management, used to define and modify user group permissions, including:

[0095] (1) System administrator group, which has full permissions and management scope.

[0096] (2) System operator group, which has full operation permissions in the designated area but no permissions outside the designated area.

[0097] (3) System monitor group: This group has the authority to browse information only in the specified area and cannot browse information outside the specified area, nor can it make changes to the system.

[0098] (4) Specific functional groups can be added.

[0099] After logging in, the user can change the login password by himself. If the password is incorrect three times, the user will be prohibited from logging in. When the same user name is used to log in at the same time, the system can prohibit simultaneous logins and only retain one valid login.

[0100] Regarding the log management function, you can check the system operation log to determine whether each operation has been recorded.

[0101] The optical cable security intelligent operation and maintenance system of the embodiment of the present invention is an intelligent operation and maintenance product tailored for the optical fiber construction, management, and maintenance departments at all levels of the dedicated communication network, based on an in-depth analysis of the current optical fiber network maintenance and management shortcomings, combined with the actual needs of optical fiber network maintenance and management work, and aimed at the national defense optical fiber networking and intelligent operation and maintenance management. It is based on the grid management model, combined with the GIS geographic information platform, through the background resource management system, when a dangerous signal (human damage, excavation) occurs, it will immediately generate an alarm message (including positioning information) and combine it with the supervision system GIS, notify the on-duty patrol personnel to handle it in time, realize the monitoring and management of the optical fiber physical network, and provide a strong guarantee for the safe and efficient operation of the optical fiber network.

[0102] Among them, the system construction implements the general principles of "applicability, advancement, and economy".

[0103] Applicability: The system is designed based on real-world requirements, with effective application as the core and the synchronous coordination of technology construction and working mechanisms as the support, ensuring that the system can effectively serve the optical fiber network operation and maintenance institutions of the military.

[0104] Advancement: The system is constructed using mainstream hardware devices in the industry, providing standard protocols, having good compatibility and general software and hardware interfaces, and providing a certain number of reserved interfaces and spare part modules to balance current and long-term needs.

[0105] Economy: Each optical cable occupies one core for monitoring. The overall configuration of the system has high performance, and the construction cost and investment are reasonable.

[0106] By setting up optical cable security intelligent operation and maintenance equipment at the local end, enabling the optical signal demodulation device to cooperate with the detection of the vibration generated when the optical cable is damaged by the sensing of the optical cable, and analyzing to obtain monitoring data including the positioning and category of external vibration sensing events, and cooperating with the network management platform to send alarm information in a timely and effective manner. On the one hand, a set of optical cable security warning system is built, which combines advanced AI algorithms with existing operation and maintenance operations and safety management to truly realize the intelligentization of pipeline operation and maintenance and the real-time monitoring of the optical cable line. On the other hand, stable, timely and complete vibration feedback can be obtained by simply setting up a low-cost detection optical cable at one end, without the need to add sensors to the optical cable or reflectors at the end, etc. The single-end deployment is more convenient and economical. When a dangerous signal (human damage, excavation) occurs, an alarm message (including positioning information) is generated immediately and combined with the GIS of the supervision system to notify the on-duty patrol personnel to handle it in a timely manner, providing guarantee for the safe operation of the optical cable.

[0107] Please refer to Figure 7 , a method for monitoring the security of an optical cable according to another embodiment of the present invention, using the above-mentioned optical cable security intelligent operation and maintenance system, including:

[0108] Step 201, generate a first optical pulse signal and inject it into the detection optical cable. The first optical pulse signal generates Rayleigh scattering during the transmission along the optical cable and returns along the optical cable to form a second pulse signal; demodulate the second optical pulse signal by phase to obtain the acoustic wave and the action signal of external vibration sensing on the optical fiber, and convert it into a digital electrical signal.

[0109] Step 202, analyze the digital electrical signal based on the training data model, and determine the positioning of the external vibration sensing event through the optical time domain reflectometry principle to obtain the monitoring data; the training data model is obtained based on the elasto-optic effect and a large amount of data training, and is used to distinguish the vibration category of the external vibration sensing event.

[0110] Step 203: Obtain monitoring data and present the operating status of the optical cable network in real time according to the monitoring data; when the monitoring signal includes an external vibration sensing event, send an alarm message based on the geographic information system, and the alarm message includes the vibration category, time, and location of the external vibration sensing event.

[0111] On the other hand, the present invention provides a control device for an optical cable security intelligent operation and maintenance system. The control device for the optical cable security intelligent operation and maintenance system includes: a memory and at least one processor. Instructions are stored in the memory, and the memory and the at least one processor are interconnected by a line; the at least one processor invokes the instructions in the memory to cause the control device for the optical cable security intelligent operation and maintenance system to execute each step of the control method for the optical cable security intelligent operation and maintenance system as described above.

[0112] On yet another hand, the present invention provides a computer-readable storage medium storing a computer program, and the computer program can implement the method as described above when executed by a processor.

[0113] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the embodiments of the present invention can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0114] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0115] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An optical cable security intelligent operation and maintenance system, characterized in that: It includes optical cable security intelligent operation and maintenance equipment and a network management platform. The optical cable security intelligent operation and maintenance equipment is installed at the local end. The optical cable security intelligent operation and maintenance equipment includes a detection optical cable, an optical signal demodulation device and a signal processing host; The detection optical cable is a common single-mode communication optical fiber, or a spare fiber core of an optical cable to be monitored; The optical signal demodulation device is used to: generate a first optical pulse signal and inject it into the detection optical cable, the first optical pulse signal generates Rayleigh scattering during transmission along the optical cable and returns along the optical cable to form a second pulse signal; obtain the action signal of the sound wave and the external vibration sensor on the optical fiber by phase demodulating the second optical pulse signal, and convert it into a digital electrical signal; The signal processing host is used to: analyze the digital electrical signal based on the training data model, and determine the location of the external vibration sensing event through the principle of optical time domain reflection to obtain monitoring data; based on the elastic light effect, the training data model is used to identify the vibration category of the external vibration sensing event based on the time series evolution relationship between the short-time feature information mined based on the hidden Markov mining on the basis of the multi-domain feature extraction of the short-time signal unit; The training process of the training data model includes: constructing different types of event databases based on the signals collected at each spatial point; converting the signal samples into feature vectors and feature vector sequences required for training the hidden Markov model by extracting multi-domain features of short-time units in each signal sample; offline training of a typical event hidden Markov model and constructing an event hidden Markov model of the point to obtain the training data model; The network management platform is used to: obtain the monitoring data and present the operating status of the optical cable network in real time based on the monitoring data; when the monitoring signal includes an external vibration sensing event, send an alarm message based on a geographic information system, and the alarm message includes the vibration type, vibration time and vibration location of the external vibration sensing event.

2. The optical cable security intelligent operation and maintenance system according to claim 1, characterized in that: The signal processing host is also used to: during online identification, calculate the output probability of each event model of the test signal input according to the model matching idea, analyze the frequency domain characteristics, time domain characteristics and phase characteristics of the digital electrical signal based on the training data model, and obtain the vibration category of the external vibration sensing event, wherein the vibration category includes manual excavation, vehicle rolling and mechanical construction, etc.; The observation sequence of the digital electrical signal is O, and its corresponding output probability is P(O|λ), then: Among them, λ is the parameter of the hidden Markov model, λ=(A,B,π), π represents the initial probability distribution, A represents the state transition probability distribution, and B represents the observation probability distribution; The event type is c = index{max(P1,P2,P3)}; the optimal path output of the parameter λ of the hidden Markov model is path = [q1,q2,q3], and the Q function calculation method is: where λ is the current estimate of the parameters of the hidden Markov model.

3. The optical cable security intelligent operation and maintenance system according to claim 1, characterized in that: The optical signal demodulation device is also used for: A continuous coherent optical signal is generated based on an ultra-narrow linewidth laser, which is modulated into an optical pulse signal by an acousto-optic modulator and amplified centrally by an erbium-doped fiber amplifier to obtain the first optical pulse signal; the first optical pulse signal is injected into the detection optical cable via the isolator, the port 1 and the port 2 of the circulator in sequence; The first optical pulse signal generates Rayleigh scattering during transmission along the optical cable, and the Rayleigh scattered optical signal is then returned along the optical cable and received by port 2 and port 3 of the circulator. After the noise signal is filtered out by an optical filter, it is coupled by the first coupler and injected into an unbalanced Mach-Zehnder interferometer. The 3×3 second coupler outputs three external disturbance signals with a phase difference of 120° to obtain the second optical pulse signal; The introduced phase change information is used to obtain the effect signal of the sound wave and the external vibration sensor on the optical fiber by phase demodulating the second optical pulse signal, and is converted into an electrical signal by photoelectric detection. The signal is then synchronously collected by a synchronously triggered analog-to-digital converter controlled by a waveform generating card to obtain the digital electrical signal.

4. The optical cable security intelligent operation and maintenance system according to claim 1, characterized in that: The network management platform is also used for: The geographical resources are managed in different regions, and the geographical resources include the optical cable sections of the monitored optical cable and the geographical nodes passed through.

5. The optical cable security intelligent operation and maintenance system according to claim 4, characterized in that: The network management platform is also used for: The external vibration sensor events are managed, and the external vibration sensor events are screened and viewed based on the vibration time and vibration type, so that the number of false alarms of the alarm information is controlled within ≤10% of the total alarms.

6. The optical cable security intelligent operation and maintenance system according to claim 4, characterized in that: The network management platform is also used for: Performing curve testing and event analysis on the external vibration sensing event to obtain a test curve, wherein the optical cable segment of the test curve corresponds to the actual optical cable resource; The relevant optical cable segments associated with the test curve are automatically displayed according to the fiber jumper resource configuration of the optical path, and the specific geographical locations of the optical cables corresponding to the points on the test curve are synchronously displayed on the map interface by moving the coordinates on the test curve.

7. The optical cable security intelligent operation and maintenance system according to claim 6, characterized in that: The network management platform is also used for: Adjust the optical fiber average loss threshold, reflection event height threshold, non-reflection event attenuation threshold, and end height threshold, and directly analyze the tested curve after adjustment; the reflection event includes: the jump point of the optical cable (i.e. the jump point connected with a flange), the break point of the optical cable, and the end point of the optical cable; the non-reflection event includes: the fusion point and excessive bending point of the optical cable.

8. A control method for an optical cable security intelligent operation and maintenance system, characterized in that: The optical cable security intelligent operation and maintenance system according to any one of claims 1 to 7 comprises: Generate a first optical pulse signal and inject it into the detection optical cable, wherein the first optical pulse signal generates Rayleigh scattering during transmission along the optical cable and returns along the optical cable to form a second pulse signal; obtain the effect signal of the sound wave and vibration on the optical fiber by phase demodulating the second optical pulse signal, and convert it into a digital electrical signal; The digital electrical signal is analyzed based on the training data model, and the location of the external vibration sensing event is determined by the principle of optical time domain reflection to obtain monitoring data; the training data model is obtained based on the elastic-photoelectric effect and a large amount of data training, and is used to identify the vibration category of the external vibration sensing event; Acquire the monitoring data, and present the operation status of the optical cable network in real time according to the monitoring data; when the monitoring signal includes an external vibration sensing event, send an alarm message based on the geographic information system, and the alarm message includes the vibration type, time and location of the external vibration sensing event.

9. A control device for an optical cable security intelligent operation and maintenance system, characterized in that: The control device of the optical cable security intelligent operation and maintenance system includes: a memory and at least one processor, the memory stores instructions, and the memory and the at least one processor are interconnected through lines; the at least one processor calls the instructions in the memory to enable the control device of the optical cable security intelligent operation and maintenance system to execute each step of the control method of the optical cable security intelligent operation and maintenance system as described in claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, can implement the method according to claim 8.

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