C+L400G optical line protection device fault location method and system

Abstract

The present application provides a method and system for improving the fault location of a C+L400G optical line protection device, which relates to the field of electronic information technology. The method includes: when the C+L400G system intervenes in an external optical line protection device, obtaining multiple points to be connected; dividing a first connection line and a second connection line; in a state where the first connection line is set as a working line, injecting a detection optical signal into the second connection line through an optical coupling unit, extracting a spare reflected optical signal; performing an abnormality judgment, and if there is an abnormal reflection, starting the attenuation analysis unit to locate the attenuation point fault and outputting the spare fault location result. This application solves the technical problem in the prior art of inaccurate fault location caused by relying solely on the received optical power to judge the availability of the line in the C+L400G system. The accuracy of fault location is improved by starting the attenuation analysis unit to locate the fault after detecting the abnormality of the reflected light.

Description

Technical Field

[0001] The present application relates to the field of electronic information technology, and in particular to a method and system for locating a fault in a C+L400G optical line protection device. Background Art

[0002] In the field of fiber-optic communications, optical line protection devices are critical equipment for ensuring network reliability. Currently, fault location typically involves monitoring the received optical power or line loss of a line and comparing it to a preset reference value. When the threshold is exceeded, an alarm is triggered, triggering a failover to a backup route. In traditional C-band systems, due to the relatively low optical power, this monitoring method based on received optical power or line loss can effectively determine the availability of backup routes. However, in C+L400G systems, to increase transmission capacity, the optical power has been increased to 27dBm. While this improves system bandwidth and capacity, it also increases the impact of contamination on the fiber connector endface and localized loss on system performance. This can easily generate excessive reflected light, preventing the system amplifier from properly pumping. In this case, relying solely on monitoring received optical power is ineffective in determining line availability, making it difficult to accurately locate faults, resulting in undetected backup line failures. In the event of a fault, the system switches to an equally unavailable backup line, leading to failed failover and service interruption.

[0003] In summary, the prior art has a technical problem of inaccurate fault location due to relying solely on received optical power to determine line availability in a C+L400G system. Summary of the Invention

[0004] The purpose of this application is to provide a C+L400G optical line protection device fault location method and system to solve the technical problem in the prior art that the fault location is inaccurate due to the fact that the C+L400G system only relies on the received optical power to judge the availability of the line.

[0005] In view of the above problems, the present application provides a C+L400G optical line protection device fault location method and system.

[0006] In the first aspect, the present application provides a C+L400G optical line protection device fault locating method, which is implemented by improving the C+L400G optical line protection device fault locating system, wherein the C+L400G optical line protection device fault locating method includes: when the C+L400G system intervenes in an external optical line protection device, a plurality of points to be connected are obtained, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit and a loss analysis unit; a first connection line and a second connection line are obtained according to the plurality of points to be connected, the first connection line is a main line, and the second connection line is a backup line; when the first connection line is set as a working line, a detection light signal is injected into the second connection line through the optical coupling unit to extract a backup reflected light signal; the reflected light detection unit performs an abnormality judgment based on the backup reflected light signal, and if there is abnormal reflection in the second connection line, the loss analysis unit is started to perform attenuation point fault location on the second connection line, and outputs the backup fault location result.

[0007] Optionally, an image sensing device is connected to capture images of each connection point of the optical line protection device to obtain a connection point image set; defect features are identified on each image of the connection point image set to obtain abnormal connection points, and cleaning reminders are issued based on the abnormal connection points until all connection points are normal, and the optical line protection device is started to intervene in the C+L400G system.

[0008] Optionally, determine whether a fiber jumper replacement is required between the C+L400G system and the ODF rack. If a fiber jumper replacement is required, obtain the fiber jumper connection point between the C+L400G system and the ODF rack; and update the multiple points to be connected with the fiber jumper connection point.

[0009] Optionally, the backup reflected optical signal includes the reflected power P21 detected by the second connection line, the reflected power P20 of the C+L400G system, and the reflected power threshold P0 of the C+L400G system.

[0010] Optionally, the backup reflection alarm threshold is calculated based on the backup reflected light signal. , the expression is ,in, is the empirical compensation factor; if the reflected power P21 detected by the second connection line is greater than or equal to the standby reflection alarm threshold , the second connection line has abnormal reflection; if the reflection power P21 detected by the second connection line is less than the standby reflection alarm threshold , there is no abnormal reflection in the second connecting line.

[0011] Optionally, when the first connection line is disconnected and the second connection line is set as the working line, a detection light signal is injected into the first connection line through the optical coupling unit to extract the main reflected light signal; the reflected light detection unit makes an abnormality judgment based on the main reflected light signal. If there is abnormal reflection in the first connection line, the attenuation analysis unit is started to locate the attenuation point fault of the first connection line and output the main fault location result.

[0012] Optionally, the main reflected optical signal includes the reflected power P11 detected by the first connection line, the reflected power P10 of the C+L400G system, and the reflected power threshold of the C+L400G system. .

[0013] Optionally, the primary reflection alarm threshold is calculated based on the primary reflected light signal. , the expression is ,in, is the empirical compensation factor; if the reflected power P11 detected by the first connection line is greater than or equal to the primary reflection alarm threshold , the first connection line has abnormal reflection; if the reflected power P11 detected by the second connection line is less than the main reflection alarm threshold , there is no abnormal reflection in the first connecting line.

[0014] Optionally, the attenuation analysis unit stores a preset reflection power distribution curve, which is obtained through continuous detection sampling test of a known reflection power signal; the attenuation analysis unit constructs a real-time reflection power distribution curve based on the real-time distribution of the standby reflected optical signal; performs abnormal attenuation offset analysis based on the preset reflection power distribution curve and the real-time reflection power distribution curve, including attenuation mutation, abnormal increase in reflection, and abnormal slope attenuation; calculates a loss offset index based on the attenuation mutation, abnormal increase in reflection, and abnormal slope attenuation; and outputs a standby fault location result if the attenuation offset index is outside the preset tolerance range.

[0015] In the second aspect, the present application also provides an improved C+L400G optical line protection device fault locating system, which is used to execute the C+L400G optical line protection device fault locating method as described in the first aspect, wherein the improved C+L400G optical line protection device fault locating system includes: a to-be-connected point acquisition module, which is used to obtain multiple to-be-connected points when the C+L400G system intervenes in an external optical line protection device, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit and a loss analysis unit; a line division module, which is used to divide the multiple to-be-connected points into a first connection line and a second connection line, the first connection line being the main line and the second connection line being the backup line; an optical signal injection module, which is used to inject a detection optical signal into the second connection line through the optical coupling unit when the first connection line is set as the working line, and extract a backup reflected light signal; an abnormality judgment module, which is used for the reflected light detection unit to perform abnormality judgment based on the backup reflected light signal. If there is abnormal reflection in the second connection line, the loss analysis unit is started to perform attenuation point fault location on the second connection line, and output the backup fault location result.

[0016] One or more technical solutions provided in this application have at least the following beneficial effects:

[0017] When the C+L400G system is connected to an external optical line protection device, multiple points to be connected are obtained, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit, and a loss analysis unit. A first connection line and a second connection line are obtained according to the multiple points to be connected, with the first connection line being the primary line and the second connection line being the backup line. While the first connection line is set as the working line, a detection light signal is injected into the second connection line via the optical coupling unit to extract a backup reflected light signal. The reflected light detection unit performs an abnormality determination based on the backup reflected light signal. If the second connection line has abnormal reflection, the loss analysis unit is activated to locate the loss point fault on the second connection line and output a backup fault location result. In other words, by obtaining multiple points to be connected and dividing them into primary and backup lines, injecting a detection light signal into the backup line while the primary line is working, determining an abnormality on the backup line via the reflected light detection unit, and accurately locating the backup line fault using the loss analysis unit, the system avoids the situation where the service light is unavailable only after switching to the backup line. This improves the accuracy and efficiency of fault location, thereby preventing long-term service interruption after switching to the backup line.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the description, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically listed below. It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in this application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and a person of ordinary skill in the art can obtain other drawings based on the provided drawings without creative work.

[0020] Figure 1 This is a flow chart of the fault location method for the C+L400G optical line protection device of this application.

[0021] Figure 2 This is a structural diagram of the C+L400G system intervening in the external optical line protection device of the C+L400G optical line protection device fault locating method of this application.

[0022] Figure 3 This is a structural diagram of the fault location system of the C+L400G optical line protection device of this application.

[0023] Description of reference numerals: to-be-connected point acquisition module 21 , line division module 22 , optical signal injection module 23 , abnormality judgment module 24 . DETAILED DESCRIPTION

[0024] This application solves the technical problem of inaccurate fault location in the prior art by providing a C+L400G optical line protection device fault location method and system, which is caused by relying solely on received optical power to determine line availability in the C+L400G system. By obtaining multiple points to be connected and dividing them into primary and backup lines, a detection optical signal is injected into the backup line when the primary line is in working condition, and an abnormality judgment is made on the backup line through the reflected light detection unit. The attenuation analysis unit is used to accurately locate the fault of the backup line, thereby avoiding the situation where the service light is switched to the backup line and then being found to be unavailable. At the same time, the accuracy and efficiency of fault location are improved, thereby avoiding long-term service interruption after switching to the backup line.

[0025] Below, the technical solutions in this application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments of this application. It should be understood that this application is not limited to the example embodiments described herein. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should also be noted that, for the convenience of description, only the parts related to this application, rather than all of them, are shown in the accompanying drawings.

[0026] For example 1, please refer to the attached Figure 1 The present application provides a C+L400G optical line protection device fault locating method, wherein the C+L400G optical line protection device fault locating method is executed by a C+L400G optical line protection device fault locating system, and the C+L400G optical line protection device fault locating method specifically includes the following steps:

[0027] S100: When the C+L400G system is connected to an external optical line protection device, a plurality of points to be connected are obtained, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit, and a loss analysis unit.

[0028] Specifically, the C+L400G system refers to a high-capacity fiber-optic communication system that combines the C-band (1530nm to 1565nm) and L-band (1565nm to 1625nm) fiber frequency bands, typically used for high-capacity data transmission. 400G refers to the transmission rate of a single wavelength, meaning each wavelength carries 400Gbps of data. By increasing the optical power (27dBm), the C+L400G system can increase transmission capacity, but this also introduces greater reflective light issues. Optical line protection devices are devices used to monitor and protect optical lines in fiber-optic communication systems. When a fault occurs on the primary line, the protection device automatically switches to a backup route to ensure stable operation of the communication system.

[0029] The optical line protection device consists of an optical coupling unit, a reflected light detection unit, and a loss analysis unit. The optical coupling unit couples optical signals from one optical path to another. Its function is to use the reflected light generated by the reference light source and couple the loss analysis unit's detection light into the non-working path. The reflected light detection unit primarily detects the reflected light from the reference light source. Reflected light is generated by the optical signal reflecting off discontinuities in the optical fiber (such as connectors or contamination). The loss analysis unit primarily detects the loss at various loss points in the non-working path.

[0030] As attached Figure 2 As shown, Figure 21 to 12 are connection points, and the ODF is a fiber distribution frame. When an external optical line protection device is introduced into the C+L400G system, multiple fiber connection points within the C+L400G system must be identified and connected. For example, introducing an external optical line protection device (OLP) into a C+L400G system that is already carrying services typically adds at least eight new connection points. If fiber jumpers need to be replaced between the C+L400G system and the ODF (e.g., 1→3, 2→4), 12 connection points are added, updating multiple connection points. When the C+L400G system is introduced into the ODF, the OPD operates on the first connection line, represented by the solid line in the figure; when the C+L400G system is introduced into the ODF, the OPD operates on the second connection line, represented by the dashed line in the figure.

[0031] Furthermore, the present application S100 includes:

[0032] The image sensing device is connected to capture images of each connection point of the optical line protection device to obtain a connection point image set; defect features are identified on each image in the connection point image set to obtain abnormal connection points, and cleaning reminders are issued based on the abnormal connection points until all connection points are normal, and the optical line protection device is started to intervene in the C+L400G system.

[0033] Specifically, an image sensing device (such as a high-resolution camera or image sensor) is connected to capture images of each connection point of the optical line protection device. Typically, a high-resolution camera or image sensor is used to sequentially capture images of each fiber connection point, generating a collection of connection point images that comprehensively reflects the status of each connection point. Image analysis technology is used to automatically identify potential defects or anomalies in the image, such as contaminants, scratches, end face cracks, and eccentric insertions, which could affect connection quality.

[0034] Image processing analyzes the images of each connection point to identify potential defect signatures. These signatures represent quality issues that may occur at the fiber optic connector end face or joint. These include contaminants (such as dust, oil, or other tiny particles adhering to the fiber optic connector end face, resulting in poor signal transmission), scratches (physical scratches on the connector end face, which typically affect the reflection and transmission of light signals), end face chipping (cracks or damage on the fiber optic connector end face, which can lead to unstable connections and affect signal quality), and off-center insertion (incomplete or off-center insertion of the connector, which can cause poor signal or connection failure).

[0035] First, the images of each connection point undergo image preprocessing. This involves performing a series of processing operations, including denoising, contrast enhancement, and grayscaling, to enhance clarity, remove noise, and adjust contrast. After image preprocessing, image analysis algorithms are used to identify defect features. For example, the Canny edge detection algorithm is used to identify edge features in the image, thereby identifying problems such as scratches and cracks. A known defect template is compared with the connection point image to identify features such as contaminants, cracks, and eccentric insertions. Morphological operations such as erosion and dilation are then used to enhance or segment defect areas in the image.

[0036] Once abnormal connection points are identified (such as those with contaminants, scratches, or cracks), these connection points are marked, and a report or alarm, known as a cleaning reminder, is generated. A cleaning reminder is issued to maintenance personnel, requiring them to clean or repair these connection points until they return to normal. Cleaning reminders can be sent via text message, email, or system alert. Cleaning operations typically involve using specialized tools to clean the connector end face or repair the connector. Once all connection points have been inspected and cleaned to ensure there are no abnormalities, the optical line protection device is activated and integrated into the C+L400G system to monitor and protect the status of Guangxian Road and ensure stable operation.

[0037] For example, in a C+L400G fiber-optic communication system, a connected image sensor captures images of each fiber connection point using a camera and detects anomalies at two connection points: one is visibly dirty, and the other has a loose connector. An image processing algorithm automatically marks these two abnormal connection points and sends a cleaning reminder to maintenance personnel. After the maintenance personnel clean and tighten the two connection points, the system performs another image inspection to confirm that there are no anomalies. At this point, the optical line protection device is activated and the C+L400G system is intervened.

[0038] By connecting image sensors and automatic defect recognition, comprehensive automatic detection of optical fiber connection points is achieved, improving detection efficiency and accuracy. Problems that may affect the quality of optical fiber communications, such as dirty connectors and loose joints, are discovered in a timely manner. This ensures that every connection point of the optical line protection device involved in the C+L400G system is in good condition, avoiding system failures caused by connection point problems and significantly improving system reliability.

[0039] Furthermore, the present application further comprises the following steps:

[0040] Determine whether a fiber jumper needs to be replaced between the C+L400G system and the ODF rack. If so, obtain a fiber jumper connection point between the C+L400G system and the ODF rack; and update the multiple points to be connected with the fiber jumper connection point.

[0041] Specifically, determine whether the patch cords between the C+L400G system and the optical fiber distribution frame (ODF) need to be replaced. The ODF is a fiber distribution frame used for fiber management and is typically used for splicing, connecting, and distributing optical fibers. Patch cords are short fiber cables that connect fiber equipment to other devices (such as the ODF or other network equipment) to facilitate optical signal transmission between these devices. Determine whether the current patch cords meet the requirements of the new C+L400G system. The C+L400G system generally requires high fiber quality and low attenuation. If the existing patch cords (such as those at connection points 1→3 or 2→4) do not meet these requirements, they may need to be replaced. For example, over time, patch cords may age and experience increased loss, affecting signal transmission quality. Existing patch cord connection points may be contaminated or scratched, leading to increased signal reflection and attenuation. The existing patch cords may no longer meet the requirements of the current C+L400G system. By monitoring the signal transmission quality between the C+L400G system and the ODF rack, analyzing parameters such as the aging degree and loss of the patch cord, and combining factors such as system upgrade requirements and maintenance plans, a comprehensive judgment is made as to whether the patch cord needs to be replaced.

[0042] When it is determined that a patch cord replacement is necessary, the patch cord connection points between the C+L400G system and the ODF are extracted. A patch cord connection point is the physical point of contact between the fiber optic equipment and the ODF, typically connected through a fiber optic jack. When a patch cord replacement is necessary, new patch cord connection points are obtained, corresponding to the new connection method or patch cord port. For example, if the original system's patch cord connections (1→3, 2→4) have quality issues or are no longer suitable for the C+L400G system, these patch cord connection points are marked and 12 new connection points are added to the set of pending connection points.

[0043] When a new fiber jumper connection point is acquired, multiple pending connection points are updated and added to the set of pending connection points. During C+L400G system deployment, new fiber jumper connection points may increase attenuation, thereby changing the reflected optical power. In this case, real-time monitoring of the reflected optical power is necessary. During startup, the C+L400G system requires that the reflected optical power within a 300-meter range must not exceed a set threshold (this threshold varies depending on equipment requirements). If the attenuation of a newly added connection point is excessive, causing the reflected optical power to exceed this threshold, it may prevent the system amplifier from pumping, resulting in malfunction. By replacing non-compliant fiber jumper connection points, the fiber optic transmission quality is ensured to meet the high standards of the C+L400G system, avoiding system failures caused by connection point attenuation or excessive reflected light, and ensuring network stability.

[0044] S200: A first connection line and a second connection line are obtained according to the plurality of points to be connected, wherein the first connection line is a primary line and the second connection line is a backup line.

[0045] Specifically, multiple connection points, including all connection points between primary and backup lines, are divided into two groups based on the fiber connection requirements: primary (primary) and secondary (backup) lines. This process typically involves rationally planning primary and backup lines based on network design requirements to ensure that the backup line can effectively take over in the event of a failure.

[0046] When dividing the connection lines, the points to be connected are assigned to the primary and backup lines according to the priority or actual configuration based on the network topology and work requirements. The division rules may include geographical location, service type, link quality, etc. For example, nodes with close geographical locations are divided into the same line, nodes carrying the same or similar services are divided into the same line, and nodes with better link quality are divided into the primary line. Based on the division results, the points to be connected in each group are connected through optical fiber to form two independent connection lines. The first connection line is the primary line, which means it is the main path for daily communication and data transmission. The second connection line is the backup line, and its main function is to take over the data transmission task when the first connection line fails to ensure business continuity.

[0047] After configuration is complete, the status of the primary and backup lines is monitored in real time. By monitoring the performance of the primary line (such as attenuation and reflected optical power) and the backup line's readiness status in real time, a rapid failover to the backup line is initiated in the event of a primary line failure. When the performance of the primary line drops below a certain threshold or a failure occurs, a failover is automatically initiated to the backup line, which immediately takes over data transmission, ensuring uninterrupted service. Performance monitoring and optimization of the backup line are equally important, as they must ensure rapid restoration of network services in the event of a primary line failure.

[0048] S300: In a state where the first connection line is set as a working line, inject a detection optical signal into the second connection line through the optical coupling unit to extract a spare reflected optical signal.

[0049] The standby reflected optical signal includes the reflected power P21 detected by the second connection line, the reflected power P20 of the C+L400G system, and the reflected power threshold P0 of the C+L400G system.

[0050] Specifically, when the C+L400G system is deployed in an optical line protection device, the device is first operated on the primary line. After the C+L400G system stabilizes for half an hour, a detection optical signal is injected into the secondary connection line (the backup line) through the optical coupling unit. This signal is typically a light signal of known intensity, which is transmitted through the optical fiber and reflected back from the backup line. The backup reflected optical signal is then recorded and extracted, including the reflected power P21 detected by the backup line of the optical line protection device (i.e., the reflection characteristics of the backup line), the reflected power P20 of the C+L400G system (i.e., the reflection characteristics under normal operating conditions), and the reflected power threshold P0 of the C+L400G system (i.e., the maximum acceptable reflected power value).

[0051] By injecting a probe optical signal and analyzing the reflected optical signal, the system effectively detects potential anomalies in the backup line, such as poor connections and dirt. This allows for early detection of potential backup line failures, providing early warnings and reminders for cleaning or maintenance. This allows issues to be resolved before actual failures occur, preventing service interruptions. Dynamic monitoring of the backup line's reflected optical signal ensures that the backup line can immediately take over data transmission tasks if a problem occurs on the primary line.

[0052] S400: The reflected light detection unit performs abnormality judgment based on the backup reflected light signal. If abnormal reflection exists in the second connection line, the attenuation analysis unit is activated to locate the attenuation point fault of the second connection line and output the backup fault location result.

[0053] Furthermore, the present application S400 includes:

[0054] Calculate the backup reflection alarm threshold according to the backup reflected light signal , the expression is ,in, is the empirical compensation factor; if the reflected power P21 detected by the second connection line is greater than or equal to the standby reflection alarm threshold , the second connection line has abnormal reflection; if the reflection power P21 detected by the second connection line is less than the standby reflection alarm threshold , there is no abnormal reflection in the second connecting line.

[0055] Specifically, the reflected light detection unit determines anomalies based on the backup reflected light signal. This reflected light signal is typically generated by the detection light signal encountering any imperfections (such as connectors or contamination) along the fiber path. The backup reflection alarm threshold is a standard value used to determine whether abnormal reflections exist on the backup connection line. It is calculated by calculating certain parameters of the backup reflected light signal.

[0056] The expression for calculating the standby reflection alarm threshold is: , where P21 is the reflected power detected by the second connection line, P20 is the reflected power of the C+L400G system, and P0 is the reflected power threshold of the C+L400G system. This is an empirical compensation factor used to compensate for fluctuations in reflected optical power due to actual line conditions. It is flexibly selected based on line conditions and is usually set to 2 dB.

[0057] The health status of the backup line is determined by comparing the reflected power P21 with the backup reflection alarm threshold. If the reflected power P21 detected by the second connection line is greater than or equal to the backup reflection alarm threshold , it is considered that there is abnormal reflection in the backup line, which may be a problem of poor connection, pollution or attenuation, and an alarm is triggered. If the reflected power P21 detected by the second connection line is less than the backup reflection alarm threshold , it is believed that there is no abnormal reflection on the backup line, the line status is normal, and no alarm will be triggered.

[0058] For example, in a C+L400G system, the following are the measurement results of various parameters: P21 (reflected optical power of the standby line) is -28dBm; P20 (reflected optical power of the C+L400G system) is -30dBm; P0 (reflected power threshold of the C+L400G system) is -32dBm; (Experience compensation factor) is 2dB, then the calculated backup reflection alarm threshold At this time, P21 is greater than the standby reflection alarm threshold, and it is considered that the second connection line has abnormal reflection and needs to be repaired or cleaned.

[0059] By calculating the backup reflection alarm threshold, the system accurately determines whether abnormal reflections exist on the backup line, enabling early detection and resolution of problems. This reduces emergency repairs and service interruptions caused by backup line failures, thereby reducing maintenance costs and system downtime. By introducing an empirical compensation factor, the alarm threshold can be dynamically adjusted based on actual line conditions, adapting to the characteristics of different fiber lines and maintaining high alarm accuracy in various environments and conditions.

[0060] Furthermore, the present application further comprises the following steps:

[0061] In which, the attenuation analysis unit stores a preset reflection power distribution curve, which is obtained through continuous detection sampling test of a known reflection power signal; the attenuation analysis unit constructs a real-time reflection power distribution curve according to the real-time distribution of the standby reflected optical signal; performs abnormal attenuation offset analysis according to the preset reflection power distribution curve and the real-time reflection power distribution curve, including sudden attenuation change, abnormal increase in reflection, and abnormal slope attenuation; calculates a loss offset index according to the sudden attenuation change, abnormal increase in reflection, and abnormal slope attenuation; and outputs a standby fault location result if the loss offset index is outside the preset tolerance range.

[0062] Specifically, when the reflected light detected by the reflected light detection unit exceeds a threshold and generates an alarm, indicating abnormal reflection in the second connection line, the loss analysis unit is activated to perform detection. The loss analysis unit's detection results are compared with a pre-set reference curve to output a backup fault location result. The loss analysis unit obtains this result through continuous detection and sampling of a known reflected power signal. By performing long-term testing on the optical fiber line, it accumulates reflected power data and fits a curve. A reference light source is used to transmit an optical signal to the line, capturing the light signal reflected from the optical fiber. Under normal operating conditions, the reflected light power is continuously detected and sampled. For example, a time domain reflectometer (OTDR) is used to detect the reflected power of the optical fiber line in real time. The reflected signal is sampled at different locations and times to generate a series of power data. Continuous detection and sampling testing involves continuously collecting reflected power signals over a period of time to accumulate sufficient data to depict the reflected power trend under different system conditions.

[0063] All collected reflected power data is combined and analyzed for variations over fiber length. Ultimately, a standardized reflected power distribution curve is plotted, reflecting the reflection characteristics of the fiber line under normal conditions. This is known as the preset reflected power distribution curve. This curve describes how reflected light power varies with distance or time under normal operating conditions. It represents the normal reflected light power distribution in the absence of faults or anomalies and serves as a reference.

[0064] The loss analysis unit constructs a real-time reflection power distribution curve based on the real-time collection of reflected optical signals from the backup line. This curve reflects the reflection changes of the optical signal in actual operation and is used to compare with the preset curve to analyze whether there are any abnormalities. Based on the preset reflection power distribution curve and the real-time reflection power distribution curve, an abnormal loss offset analysis is performed to identify sudden loss changes, abnormal increase in reflection, and abnormal slope attenuation. A sudden loss change means that if the attenuation of a certain section of the line is very sudden, it will usually produce a large reflection, which will be displayed as a sharp change in the curve; an abnormal increase in reflection means that when the reflected optical power of a certain section of the line suddenly increases and exceeds the normal range, it will be displayed as an abnormal rise in the curve; an abnormal slope attenuation means that if the attenuation rate of a certain section of the line is too fast, it will be manifested as an abnormal slope of the real-time curve.

[0065] That is to say, the real-time reflection power distribution curve is compared with the preset reflection power distribution curve to check whether there is any deviation from the preset curve. By comparing the reflection power values ​​of the two at the same distance point, it can be determined whether an abnormality has occurred. If the reflected light power at a certain point changes significantly compared to the preset value, it means that the optical fiber may have physical damage, loose connectors or poor connections, that is, there is a sudden attenuation change. If the reflected power in certain areas increases significantly, it may indicate that the connector is dirty or defective, or that the optical fiber is damaged, causing the optical signal to reflect too strongly, that is, there is an abnormal increase in reflection. If the attenuation slope of the optical fiber reflected light is significantly different from the preset curve, it may be due to loss caused by optical fiber aging, tortuosity or external factors, that is, there is a slope attenuation abnormality.

[0066] Further analysis is performed based on the sudden loss change, abnormal reflectivity increase, and abnormal slope attenuation. The severity of these abnormalities is assessed and weighted to produce a loss excursion index. Specifically, weights are assigned to these abnormalities based on their importance to the line anomaly. The product of the severity of each abnormality and the corresponding weight is then calculated to produce the loss excursion index. The loss excursion index determines the degree of anomaly by measuring the deviation between the preset reflected power distribution curve and the real-time reflected power distribution curve. The preset tolerance interval is a threshold range that defines the acceptable difference between the normal reflected optical power and the deviation value. In actual operation, lines may experience slight power excursions due to factors such as temperature fluctuations and external interference. Therefore, a tolerance interval is set to allow for a certain degree of deviation. If the loss excursion index exceeds this tolerance interval, it indicates a possible line fault or anomaly. If the index is within the tolerance interval, the line performance remains within normal range.

[0067] When the attenuation offset index exceeds the tolerance range, the output of the backup fault location result is triggered, including the fault location, anomaly type, maintenance recommendations, etc. The backup fault location result is a specific diagnostic result of the fault location and type derived from the attenuation offset index. Through real-time monitoring and comparison of the reflected power distribution curve, the attenuation analysis unit can accurately determine the attenuation problem in the backup line, especially locate specific fault locations such as reflection anomalies and attenuation mutations, issue alarms in a timely manner, and provide clear fault location, thereby improving maintenance efficiency and effectively preventing service interruptions caused by backup line failures. Especially in the C+L400G system, it ensures the stability of business light switching to the backup line and enhances overall reliability.

[0068] Furthermore, the present application further comprises the following steps:

[0069] When the first connection line is disconnected and the second connection line is set as a working line, a detection light signal is injected into the first connection line through the optical coupling unit to extract a main reflected light signal; the reflected light detection unit performs an abnormality judgment based on the main reflected light signal, and if abnormal reflection exists in the first connection line, the attenuation analysis unit is activated to locate the attenuation point fault of the first connection line and output the main fault location result.

[0070] The main reflected optical signal includes the reflected power P11 detected by the first connection line, the reflected power P10 of the C+L400G system, and the reflected power threshold of the C+L400G system. .

[0071] Specifically, when the first connection line is disconnected and the second connection line is set to the working line state, that is, the second connection line is the current working line and the first connection line is the current non-working line. At this time, similar to the above steps, the optical line protection device is operated in the backup line. After the C+L400G system has been running stably for half an hour, a detection optical signal is injected into the first connection line through the optical coupling unit. The reflected power P11 detected by the backup line of the optical line protection device, the reflected power P10 of the C+L400G system, and the reflected power threshold P0 of the C+L400G system are recorded at this time to obtain the main reflected optical signal, that is, to detect the reflected power of the current non-working line in real time.

[0072] The reflected light detection unit detects anomalies based on the primary reflected light signal. If the detected reflected light exceeds a threshold, indicating abnormal reflection on the first connection line and a possible line fault, the loss analysis unit is activated. The loss analysis unit further analyzes possible loss points on the line and locates the specific fault location by analyzing the changes in the reflected light signal at different locations.

[0073] The loss analysis unit constructs a real-time reflected power distribution curve based on the real-time distribution of the primary reflected optical signal and compares it with a built-in preset reflected power distribution curve. If a threshold is reached, an alarm is generated and the primary fault location results, including the fault location, anomaly type, and repair recommendations, are output. The optical line protection device always monitors non-working lines. It can drive the loss analysis unit to detect the line based on the line reflection alarm that appears, and automatically compare the test results with the reference curve to indicate the fault point. By monitoring the status of the optical fiber line in real time through the reflected optical signal, problems can be immediately identified when an anomaly occurs, and the loss conditions of each loss point in the non-working route can be accurately detected, improving the accuracy of fault diagnosis and reducing the possibility of false alarms and missed alarms.

[0074] Furthermore, the present application further comprises the following steps:

[0075] Calculate the main reflection alarm threshold according to the main reflected optical signal , the expression is ,in, is the empirical compensation factor; if the reflected power P11 detected by the first connection line is greater than or equal to the primary reflection alarm threshold , the first connection line has abnormal reflection; if the reflected power P11 detected by the second connection line is less than the main reflection alarm threshold , there is no abnormal reflection in the first connecting line.

[0076] Specifically, the primary reflection alarm threshold is calculated based on the primary reflected light signal. , the expression is ,in, It is an empirical compensation factor, usually 2dB, which can be flexibly selected according to the line conditions. P11 is the reflected power detected by the first connection line, P10 is the reflected power of the C+L400G system, This is the reflected power threshold of the C+L400G system. The primary reflective alarm threshold is determined by calculating the difference between the reflected power and the threshold set for the C+L400G system.

[0077] If the reflected power P11 detected by the first connection line is greater than or equal to the primary reflection alarm threshold , indicating that the first connection line has abnormal reflection and needs to be repaired, fault location, alarm and maintenance request are carried out. If the reflected power P11 detected by the second connection line is less than the main reflection alarm threshold , what is the first connection line without abnormal reflection, maintain normal operation. By accurately calculating the main reflection alarm threshold and comparing it with the reflected power P11, anomalies in the reflected optical signal are promptly detected, reducing false alarms and missed alarms, and ensuring efficient fault detection.

[0078] In summary, the C+L400G optical line protection device fault locating method provided in this application has the following beneficial effects:

[0079] When the C+L400G system is connected to an external optical line protection device, multiple points to be connected are obtained, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit, and a loss analysis unit. A first connection line and a second connection line are obtained according to the multiple points to be connected, with the first connection line being the primary line and the second connection line being the backup line. While the first connection line is set as the working line, a detection light signal is injected into the second connection line via the optical coupling unit to extract a backup reflected light signal. The reflected light detection unit performs an abnormality determination based on the backup reflected light signal. If the second connection line has abnormal reflection, the loss analysis unit is activated to locate the loss point fault on the second connection line and output a backup fault location result. In other words, by obtaining multiple points to be connected and dividing them into primary and backup lines, injecting a detection light signal into the backup line while the primary line is working, determining an abnormality on the backup line via the reflected light detection unit, and accurately locating the backup line fault using the loss analysis unit, the system avoids the situation where the service light is unavailable only after switching to the backup line. This improves the accuracy and efficiency of fault location, thereby preventing long-term service interruption after switching to the backup line.

[0080] In the second embodiment, based on the same inventive concept as the C+L400G optical line protection device fault location method in the aforementioned embodiment, the present application also provides a C+L400G optical line protection device fault location system, please refer to the attached Figure 3 The C+L400G optical line protection device fault location system includes:

[0081] The module 21 for obtaining a point to be connected is used to obtain a plurality of points to be connected when an external optical line protection device is inserted into the C+L400G system, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit and a loss analysis unit; the line division module 22 is used to divide the plurality of points to be connected into a first connection line and a second connection line according to the plurality of points to be connected, wherein the first connection line is a main line and the second connection line is a backup line; the optical signal injection module 23 is used to inject a detection optical signal into the second connection line through the optical coupling unit when the first connection line is set as a working line, and extract a backup reflected light signal; the abnormality judgment module 24 is used for the reflected light detection unit to perform abnormality judgment based on the backup reflected light signal. If there is abnormal reflection in the second connection line, the loss analysis unit is started to locate the attenuation point fault of the second connection line and output the backup fault location result.

[0082] Furthermore, the to-be-connected point acquisition module 21 in the C+L400G optical line protection device fault location system is further configured to:

[0083] The image sensing device is connected to capture images of each connection point of the optical line protection device to obtain a connection point image set; defect features are identified on each image in the connection point image set to obtain abnormal connection points, and cleaning reminders are issued based on the abnormal connection points until all connection points are normal, and the optical line protection device is started to intervene in the C+L400G system.

[0084] Furthermore, the to-be-connected point acquisition module 21 in the C+L400G optical line protection device fault location system is further configured to:

[0085] Determine whether a fiber jumper needs to be replaced between the C+L400G system and the ODF rack. If so, obtain a fiber jumper connection point between the C+L400G system and the ODF rack; and update the multiple points to be connected with the fiber jumper connection point.

[0086] Furthermore, the optical signal injection module 23 in the C+L400G optical line protection device fault location system is further used to:

[0087] The standby reflected optical signal includes the reflected power P21 detected by the second connection line, the reflected power P20 of the C+L400G system, and the reflected power threshold P0 of the C+L400G system.

[0088] Furthermore, the abnormality judgment module 24 in the fault location system for improving the C+L400G optical line protection device is further used to:

[0089] Calculate the backup reflection alarm threshold according to the backup reflected light signal , the expression is ,in, is the empirical compensation factor; if the reflected power P21 detected by the second connection line is greater than or equal to the standby reflection alarm threshold , the second connection line has abnormal reflection; if the reflection power P21 detected by the second connection line is less than the standby reflection alarm threshold , there is no abnormal reflection in the second connecting line.

[0090] Furthermore, the abnormality judgment module 24 in the fault location system for improving the C+L400G optical line protection device is further used to:

[0091] In which, the attenuation analysis unit stores a preset reflection power distribution curve, which is obtained through continuous detection sampling test of a known reflection power signal; the attenuation analysis unit constructs a real-time reflection power distribution curve according to the real-time distribution of the standby reflected optical signal; performs abnormal attenuation offset analysis according to the preset reflection power distribution curve and the real-time reflection power distribution curve, including sudden attenuation change, abnormal increase in reflection, and abnormal slope attenuation; calculates a loss offset index according to the sudden attenuation change, abnormal increase in reflection, and abnormal slope attenuation; and outputs a standby fault location result if the loss offset index is outside the preset tolerance range.

[0092] Furthermore, the improved C+L400G optical line protection device fault location system further includes a main fault location module, and the main fault location module is further used to:

[0093] When the first connection line is disconnected and the second connection line is set as a working line, a detection light signal is injected into the first connection line through the optical coupling unit to extract a main reflected light signal; the reflected light detection unit performs an abnormality judgment based on the main reflected light signal, and if abnormal reflection exists in the first connection line, the attenuation analysis unit is activated to locate the attenuation point fault of the first connection line and output the main fault location result.

[0094] Furthermore, the improved C+L400G optical line protection device fault location system further includes a main fault location module, and the main fault location module is further used to:

[0095] The main reflected optical signal includes the reflected power P11 detected by the first connection line, the reflected power P10 of the C+L400G system, and the reflected power threshold of the C+L400G system. .

[0096] Furthermore, the improved C+L400G optical line protection device fault location system further includes a main fault location module, and the main fault location module is further used to:

[0097] Calculate the main reflection alarm threshold according to the main reflected optical signal , the expression is ,in, is the empirical compensation factor; if the reflected power P11 detected by the first connection line is greater than or equal to the primary reflection alarm threshold , the first connection line has abnormal reflection; if the reflected power P11 detected by the second connection line is less than the main reflection alarm threshold , there is no abnormal reflection in the first connecting line.

[0098] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. Figure 1 The C+L400G optical line protection device fault locating method and specific examples in Example 1 are also applicable to the C+L400G optical line protection device fault locating system of this embodiment. Through the above detailed description of the C+L400G optical line protection device fault locating method, those skilled in the art can clearly understand the C+L400G optical line protection device fault locating system of this embodiment, so for the sake of brevity of the specification, it will not be described in detail here.

[0099] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0100] Obviously, for those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. C+L400G optical line protection device fault location method, characterized in that: include: When the C+L400G system is involved in an external optical line protection device, a plurality of points to be connected are obtained, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit, and a loss analysis unit; A first connection line and a second connection line are obtained according to the plurality of to-be-connected points, wherein the first connection line is a primary line and the second connection line is a backup line; In a state where the first connection line is set as a working line, injecting a detection optical signal into the second connection line through the optical coupling unit to extract a spare reflected optical signal; The reflected light detection unit performs abnormality judgment based on the backup reflected light signal. If abnormal reflection exists in the second connection line, the loss analysis unit is activated to locate the attenuation point fault of the second connection line and output the backup fault location result. The reflected light detection unit performs abnormality judgment according to the standby reflected light signal, including: Calculate the backup reflection alarm threshold according to the backup reflected light signal , the expression is ,in, is an empirical compensation factor, the standby reflected optical signal includes the reflected power P21 detected by the second connection line, the reflected power P20 of the C+L400G system, and the reflected power threshold P0 of the C+L400G system; If the reflected power P21 detected by the second connection line is greater than or equal to the standby reflection alarm threshold , there is abnormal reflection in the second connection line; If the reflected power P21 detected by the second connection line is less than the standby reflection alarm threshold , there is no abnormal reflection in the second connecting line.

2. The C+L400G optical line protection device fault locating method according to claim 1, characterized in that: In a state where the first connection line is disconnected and the second connection line is set as a working line, the method further includes: injecting a detection optical signal into the first connection line through the optical coupling unit to extract a main reflected optical signal; The reflected light detection unit performs abnormality judgment based on the main reflected light signal. If abnormal reflection exists in the first connection line, the attenuation analysis unit is activated to locate the attenuation point fault of the first connection line and output the main fault location result.

3. The C+L400G optical line protection device fault locating method according to claim 2, characterized in that: The main reflected optical signal includes the reflected power P11 detected by the first connection line, the reflected power P10 of the C+L400G system, and the reflected power threshold of the C+L400G system. .

4. The C+L400G optical line protection device fault locating method according to claim 3, characterized in that: The reflected light detection unit performs abnormality judgment based on the main reflected light signal, including: Calculate the main reflection alarm threshold according to the main reflected optical signal , the expression is ,in, is the experience compensation factor; If the reflected power P11 detected by the first connection line is greater than or equal to the primary reflection alarm threshold , there is abnormal reflection in the first connection line; If the reflected power P11 detected by the second connection line is less than the primary reflection alarm threshold , there is no abnormal reflection in the first connecting line.

5. The C+L400G optical line protection device fault locating method according to claim 1, wherein: The attenuation analysis unit locates the attenuation point fault on the second connection line, include: Wherein, the attenuation analysis unit stores a preset reflected power distribution curve, and the preset reflected power distribution curve is obtained by continuous detection sampling test of a known reflected power signal; The attenuation analysis unit constructs a real-time reflected power distribution curve according to the real-time distribution of the standby reflected optical signal; Perform abnormal attenuation deviation analysis based on the preset reflected power distribution curve and the real-time reflected power distribution curve, including attenuation mutation, abnormal increase in reflection, and abnormal slope attenuation; A loss offset index is calculated according to the attenuation mutation, abnormal increase in reflection, and abnormal slope attenuation. If the attenuation offset index is outside a preset tolerance range, an alternative fault location result is output.

6. The C+L400G optical line protection device fault locating method according to claim 1, characterized in that: Before the C+L400G system is installed with an external optical line protection device, it also includes: Connecting an image sensor device to collect images of each connection point of the optical line protection device to obtain a connection point image set; Defect features are identified for each image in the connection point image set to obtain abnormal connection points, and cleaning reminders are issued based on the abnormal connection points until all connection points are normal, and the optical line protection device is activated to intervene in the C+L400G system.

7. The C+L400G optical line protection device fault locating method according to claim 1, characterized in that: Get multiple points to be connected, including: Determine whether a fiber patch cord needs to be replaced between the C+L400G system and the ODF rack. If so, obtain a fiber patch cord connection point between the C+L400G system and the ODF rack. The plurality of points to be connected are updated with the jumper connection point. 8.C+L400G optical line protection device fault location system, characterized by: The steps for implementing the C+L400G optical line protection device fault locating method according to any one of claims 1 to 7, wherein the C+L400G optical line protection device fault locating system comprises: A module for acquiring points to be connected, used to acquire multiple points to be connected when the C+L400G system is connected to an external optical line protection device, wherein the optical line protection device includes an optical coupling unit, a reflected light detection unit, and a loss analysis unit; A line division module, configured to divide the plurality of to-be-connected points into a first connection line and a second connection line, wherein the first connection line is a primary line and the second connection line is a backup line; an optical signal injection module, configured to inject a detection optical signal into the second connection line through the optical coupling unit and extract a spare reflected optical signal when the first connection line is set as a working line; The abnormality judgment module is used for the reflected light detection unit to make abnormal judgment based on the spare reflected light signal. If there is abnormal reflection in the second connection line, the attenuation analysis unit is started to locate the attenuation point fault of the second connection line and output the spare fault location result.

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