Fault diagnosis system and method for central beam tube type OPGW (Optical Fiber Composite Overhead Ground Wire) optical cable

Abstract

The invention relates to the technical field of fault diagnosis of optical cables, in particular to a fault diagnosis system and method for a central beam tube type OPGW (Optical Fiber Composite Overhead Ground Wire) optical cable, and the system comprises an error rate monitoring unit which is used for monitoring the error rate of the optical cable; the self-excitation unit is used for changing the transmission frequency of an optical signal in the optical cable; the optical signal attenuation monitoring unit is used for monitoring the optical signal attenuation of the optical cable; the central control unit is used for determining whether the communication quality of the optical cable meets the standard or not according to the first optical signal attenuation amount, determining the reason that the communication quality of the optical cable does not meet the standard based on the comparison result of the first optical signal attenuation amount and the second optical signal attenuation amount, and adjusting the parameters of the optical signal according to the reason, or adjusting the communication quality of the optical cable according to the parameter adjustment. And determining the optical fiber with the fault. The method can improve the diagnosis precision of the potential fault of the optical cable.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cable fault diagnosis, and in particular to a central beam tube type OPGW optical cable fault diagnosis system and method. Background Art

[0002] OPGW optical cable is located at the top of the power line. It not only acts as a ground wire to protect the power line from natural disasters such as lightning strikes, but also carries the function of optical fiber communication, providing protection, dispatch telephone, administrative liaison, office automation, dispatch automation and other communication channels for the power grid. Due to the particularity of its location and the influence of factors such as line power outage and safety, it is not convenient to carry out inspection, maintenance and overhaul of OPGW optical cable. Although traditional methods include line personnel conducting manual line inspections, communication spare fiber core inspection tests and outdoor inspections of substations at prescribed times, they are effective, but they have problems such as low efficiency, high cost and difficulty in discovering hidden faults. In response to these problems, the fault diagnosis system of central bundle tube OPGW optical cable came into being. The system aims to build an intelligent monitoring and diagnosis platform through advanced technical means. The system can realize real-time collection, analysis and processing of optical cable operation data, and further improve the accuracy and efficiency of fault diagnosis. The application of these technologies not only improves the operating reliability of optical cables, but also provides a strong guarantee for the safe and stable operation of power systems.

[0003] Chinese patent publication number: CN109347546B discloses a method for optical cable fault diagnosis, including: an optical time domain reflectometer, an optical cable, and an intelligent optical cable junction box; the optical cable is connected to the intelligent optical cable junction box; the optical fiber breakpoint binary code is located in the intelligent optical cable junction box, and the intelligent optical cable junction box realizes the interconnection of the optical cable; the optical time domain reflectometer is connected to the optical cable; if the optical cable fails, each optical fiber breakpoint binary code is compared with the corresponding binary code stored, and the missing binary code is obtained by comparison, thereby determining the location where the optical cable is interrupted. The existing technology cannot effectively combine optical recognition, ranging and accurate geographic information, and cannot achieve the problem of accurate technical identification of reference points in optical cables.

[0004] It can be seen that the method for optical cable fault diagnosis has the following problems: the method encodes the optical fiber breakpoint in binary, compares the binary code of the optical fiber breakpoint with the corresponding saved binary code, obtains the missing binary code through comparison, and then determines the location where the optical cable is broken. However, this method only targets the fault of optical cable interruption, and cannot timely discover and monitor the potential faults of the optical cable. Summary of the invention

[0005] To this end, the present invention provides a central bundle tube type OPGW optical cable fault diagnosis system and method, so as to overcome the problem of low diagnostic accuracy for potential optical cable faults in the prior art.

[0006] To achieve the above object, on the one hand, the present invention provides a fault diagnosis method for a central bundle tube OPGW optical cable, comprising:

[0007] Determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal of the optical cable, and starting the self-excitation unit to reduce the transmission frequency of the optical signal in the optical cable under the condition that the communication quality of the optical cable does not meet the standard, and calculating the attenuation of the second optical signal of the optical cable based on the transmission frequency of the reduced optical signal;

[0008] Determine the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal, and determine to adjust the transmission power or transmission rate of the optical signal based on the attenuation difference if it is determined that the communication quality does not meet the standard because of data flow obstruction in the optical cable;

[0009] Under the condition that it is determined that the communication quality does not meet the standard due to a fault in the optical cable, the bit error rate of each optical fiber is detected, whether the optical fiber is faulty is determined based on the bit error rate, and whether a comprehensive inspection of the optical fiber is required is determined based on the bit error rate difference, and, under the condition that it is determined that a comprehensive inspection is not required, the adjustment amplitude for the first preset optical signal attenuation is determined based on the bit error rate difference percentage.

[0010] Further, the process of determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal includes:

[0011] comparing the first optical signal attenuation with a first preset optical signal attenuation;

[0012] If the attenuation of the first optical signal is greater than the first preset attenuation of the optical signal, determining that the communication quality of the optical cable does not meet the standard;

[0013] If the attenuation of the first optical signal is less than or equal to the first preset attenuation of the optical signal, it is determined that the communication quality of the optical cable meets the standard.

[0014] Furthermore, the calculation formula of the optical signal attenuation is as follows:

[0015]

[0016] Wherein, L represents the attenuation of the optical signal, P1 represents the optical power at the input end of the optical cable, and P2 represents the optical power at the output end of the optical cable.

[0017] Further, the process of determining the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal includes:

[0018] comparing the attenuation of the first optical signal with the attenuation of the second optical signal;

[0019] If the attenuation of the first optical signal is greater than the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is data flow obstruction in the optical cable;

[0020] If the attenuation of the first optical signal is less than or equal to the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is a fault in the optical cable.

[0021] Further, under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission power based on the attenuation difference includes:

[0022] Subtracting the first optical signal attenuation from the first preset optical signal attenuation to obtain an attenuation difference;

[0023] Comparing the attenuation difference with a preset attenuation difference;

[0024] Based on a comparison result that the attenuation difference is greater than the preset attenuation difference, determining to adjust the transmission power;

[0025] Therein, several adjustment modes are set for the transmission power, and each adjustment mode has a different adjustment range for the transmission power.

[0026] Further, under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission rate based on the attenuation difference includes:

[0027] Comparing the attenuation difference with a preset attenuation difference;

[0028] Based on a comparison result that the attenuation difference is less than or equal to the preset attenuation difference, determining to adjust the transmission rate;

[0029] Therein, several adjustment modes are set for the transmission rate, and each adjustment mode has a different adjustment range for the transmission rate.

[0030] Further, under the condition that it is determined that there is an optical cable fault, the process of determining whether the optical fiber has a fault based on the bit error rate includes:

[0031] comparing the bit error rate with a preset bit error rate;

[0032] If the bit error rate is greater than the preset bit error rate, it is determined that the optical fiber has a fault;

[0033] If the bit error rate is less than or equal to the preset bit error rate, it is determined that there is no fault in the optical fiber.

[0034] Further, the process of determining whether a comprehensive detection is required based on the bit error rate difference includes:

[0035] Comparing the bit error rate difference with a preset bit error rate difference;

[0036] If the bit error rate difference is greater than the preset bit error rate difference, it is determined that a comprehensive inspection of the optical fiber is required and an early warning is issued;

[0037] If the bit error rate difference is less than or equal to the preset bit error rate difference, it is determined that there is no need to perform a comprehensive inspection on the optical fiber.

[0038] Further, the process of determining the adjustment amplitude for the first preset optical signal attenuation based on the bit error rate difference percentage includes:

[0039] Subtract the bit error rate difference from the preset bit error rate difference to obtain a difference, and record the ratio of the difference to the preset bit error rate difference as a bit error rate difference percentage;

[0040] If the bit error rate difference percentage is greater than a preset bit error rate difference percentage, determining to use a first adjustment coefficient to adjust the first preset optical signal attenuation amount;

[0041] If the bit error rate difference percentage is less than or equal to the preset bit error rate difference percentage, it is determined to use a second adjustment coefficient to adjust the first preset optical signal attenuation.

[0042] On the other hand, the present invention also provides a fault diagnosis system for a central bundle tube type OPGW optical cable, comprising:

[0043] A bit error rate monitoring unit, which is located in the optical receiver and is used to monitor the bit error rate of the optical cable;

[0044] A self-excitation unit, which is located in the optical transmitter and is used to change the transmission frequency of the optical signal in the optical cable;

[0045] An optical signal attenuation monitoring unit, which is located in the optical receiver and is used to monitor the optical signal attenuation of the optical cable;

[0046] A central control unit is respectively connected to the bit error rate monitoring unit, the self-excitation unit and the optical signal attenuation monitoring unit, and is used to determine whether the communication quality of the optical cable meets the standard according to the first optical signal attenuation, and calculate the second optical signal attenuation under the condition that the communication quality of the optical cable does not meet the standard, and determine the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the first optical signal attenuation and the second optical signal attenuation, and adjust the parameters of the optical signal according to the reason, or determine the faulty optical fiber, and, under the condition that it is determined that there is no need to fully detect the optical fiber, determine the adjustment amplitude for the first preset optical signal attenuation based on the bit error rate difference percentage.

[0047] Compared with the prior art, the beneficial effect of the present invention is that the present invention monitors the attenuation of the optical signal, understands the transmission performance of the optical cable in real time, evaluates the communication quality and promptly discovers potential problems. Under the condition that the communication quality of the optical cable does not meet the standard, the self-excitation unit is started to reduce the transmission frequency of the optical signal. The higher the transmission frequency of the optical signal, the greater the attenuation. The lower the transmission frequency of the optical signal, the smaller the influence of data flow blocking on the attenuation of the optical signal. Therefore, based on the comparison result of the first optical signal attenuation and the second optical signal attenuation, it is determined whether the reason why the communication quality of the optical cable does not meet the standard is due to a failure of the optical cable or data flow blocking during the transmission of the optical cable. In the case of data flow blocking, the transmission power or transmission rate of the optical signal is increased within a suitable range to reduce the attenuation of the optical signal. In the case of an optical cable failure, the bit error rate of each optical fiber is determined to determine the failed optical fiber, and the degree of failure of the optical fiber is determined based on the bit error rate difference. If the degree of failure is high, a comprehensive detection warning is issued. If the degree of failure is low, the first preset optical signal attenuation is reduced within a suitable range and continuous monitoring is performed, thereby improving the diagnostic accuracy of potential faults of the optical cable.

[0048] Furthermore, the present invention determines whether the communication quality of the optical cable meets the standard based on the attenuation of the optical signal. The optical signal attenuates within a reasonable range during the transmission process. Exceeding the reasonable range indicates that the communication quality has decreased. There are factors that affect the attenuation, and this factor may be a potential fault, thereby increasing the sensitivity to the potential faults of the optical cable and improving the diagnostic accuracy of the potential faults of the optical cable.

[0049] Furthermore, the present invention is based on the offsetting of the electrical signal emitted by the self-excitation unit and the electrical signal emitted by the optical transmitter to reduce the transmission frequency of the optical signal converted from the electrical signal, calculates the attenuation of the second optical signal based on the reduced transmission frequency, and compares it with the attenuation of the first optical signal. If the attenuation of the second optical signal is less than the attenuation of the first optical signal, it indicates that there is data flow obstruction in the optical cable, thereby affecting the communication quality. In this case, the transmission power of the optical signal is appropriately increased or the transmission rate is reduced to reduce the signal attenuation. If the attenuation of the second optical signal is greater than or equal to the attenuation of the first optical signal, it indicates that there is a fault in the optical cable, thereby affecting the communication quality, and the fault needs to be further determined, thereby improving the diagnostic accuracy of potential faults of the optical cable.

[0050] Furthermore, under the condition that a fault is determined in the optical cable, the present invention detects the bit error rate of the single-mode optical fiber, compares it with a preset bit error rate to determine the faulty optical fiber, and determines the degree of the optical fiber fault according to the bit error rate difference. For the optical fiber with a high degree of fault, a replacement warning is issued, and for the optical fiber with a low degree of fault that does not affect communication needs, a first preset optical signal attenuation is reduced and the adjustment amplitude is determined according to the bit error rate difference percentage, thereby improving the diagnostic accuracy of potential optical cable faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Flow chart of a fault diagnosis method for a core bundle tube type OPGW optical cable according to an embodiment of the present invention;

[0052] Figure 2 It is a structural block diagram of a fault diagnosis system for a core bundle tube type OPGW optical cable according to an embodiment of the present invention;

[0053] Figure 3 A flow chart of determining whether the communication quality of an optical cable meets the standard according to an embodiment of the present invention;

[0054] Figure 4 The present invention is a flow chart of determining the reason why the communication quality of an optical cable does not meet the standard. DETAILED DESCRIPTION

[0055] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0056] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0057] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0058] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] See also Figure 1 As shown, it is a flow chart of a fault diagnosis method for a core bundle tube type OPGW optical cable in an embodiment of the present invention.

[0060] An embodiment of the present invention provides a method for diagnosing a fault of a central bundle tube OPGW optical cable, comprising:

[0061] Step S1, determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal of the optical cable, and starting the self-excitation unit to reduce the transmission frequency of the optical signal in the optical cable under the condition that the communication quality of the optical cable does not meet the standard, and calculating the attenuation of the second optical signal of the optical cable based on the reduced transmission frequency of the optical signal;

[0062] Step S2, determining the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal, and under the condition that it is determined that the communication quality does not meet the standard because of data flow blockage in the optical cable, determining to adjust the transmission power or transmission rate of the optical signal based on the attenuation difference;

[0063] Step S3, under the condition that it is determined that the communication quality does not meet the standard due to a fault in the optical cable, the bit error rate of each optical fiber is detected, whether the optical fiber is faulty is determined based on the bit error rate, and whether a comprehensive detection of the optical fiber is required is determined based on the bit error rate difference, and, under the condition that it is determined that a comprehensive detection is not required, the adjustment amplitude for the first preset optical signal attenuation is determined based on the bit error rate difference percentage.

[0064] Specifically, optical signal attenuation refers to the signal power loss caused by various factors during the optical fiber transmission process. It is used to measure the degree of power reduction of optical signals during transmission in optical fibers.

[0065] Specifically, the self-excited unit includes a self-excited oscillation device, which can continuously and stably emit a low-frequency electrical signal through a designed oscillation circuit, thereby modulating the high-frequency signal emitted by the optical transmitter to produce a signal with a wider bandwidth but the center frequency is still the carrier frequency, thereby reducing the frequency of the electrical signal to reduce the frequency of the optical signal converted from the electrical signal.

[0066] Specifically, the oscillation circuit includes capacitors, resistors and inductors, and is based on the interaction between charge and inductance. When charge flows out of the capacitor, a magnetic field is generated around the inductor. As the charge continues to flow, the energy in the magnetic field changes, which in turn drives the charge in the capacitor to flow again, forming a cycle to form a stable oscillation.

[0067] Specifically, the greater the transmission power of the optical signal, the smaller the attenuation of the optical signal; the smaller the transmission rate of the optical signal, the smaller the attenuation of the optical signal.

[0068] Specifically, the present invention monitors the attenuation of the optical signal, understands the transmission performance of the optical cable in real time, evaluates the communication quality and promptly discovers potential problems. When the communication quality of the optical cable does not meet the standard, the self-excitation unit is started to reduce the transmission frequency of the optical signal. The higher the transmission frequency of the optical signal, the greater the attenuation. The lower the transmission frequency of the optical signal, the smaller the effect of data flow blockage on the attenuation of the optical signal. Therefore, based on the comparison result of the first optical signal attenuation and the second optical signal attenuation, it is determined whether the reason why the communication quality of the optical cable does not meet the standard is due to a fault in the optical cable or due to data flow blockage during the transmission process of the optical cable. In the case of data flow blockage, the transmission power or transmission rate of the optical signal is increased within a suitable range to reduce the attenuation of the optical signal. In the case of an optical cable fault, the bit error rate of each optical fiber is determined to determine the faulty optical fiber, and the degree of fault of the optical fiber is determined based on the bit error rate difference. If the degree of fault is high, a comprehensive detection warning is issued. If the degree of fault is low, the first preset optical signal attenuation is reduced within a suitable range and continuous monitoring is performed.

[0069] See also Figure 3 As shown, it is a flow chart of determining whether the communication quality of the optical cable meets the standard according to an embodiment of the present invention.

[0070] Specifically, the process of determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal includes:

[0071] comparing the first optical signal attenuation with a first preset optical signal attenuation;

[0072] If the attenuation of the first optical signal is greater than the first preset attenuation of the optical signal, determining that the communication quality of the optical cable does not meet the standard;

[0073] If the attenuation of the first optical signal is less than or equal to the first preset attenuation of the optical signal, it is determined that the communication quality of the optical cable meets the standard.

[0074] Specifically, the first preset optical signal attenuation is determined according to the optical fiber material, manufacturing process, wavelength and use environment of the optical cable.

[0075] Specifically, the characteristic is that the calculation formula of the optical signal attenuation is as follows:

[0076]

[0077] Wherein, L represents the attenuation of the optical signal, P1 represents the optical power at the input end of the optical cable, and P2 represents the optical power at the output end of the optical cable.

[0078] Specifically, the optical power is measured using an optical power meter.

[0079] See also Figure 4 As shown, it is a flow chart of determining the reason why the communication quality of the optical cable does not meet the standard according to an embodiment of the present invention.

[0080] Specifically, the process of determining the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal includes:

[0081] comparing the attenuation of the first optical signal with the attenuation of the second optical signal;

[0082] If the attenuation of the first optical signal is greater than the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is data flow obstruction in the optical cable;

[0083] If the attenuation of the first optical signal is less than or equal to the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is a fault in the optical cable.

[0084] Specifically, when the transmission frequency of the optical signal in the optical cable is reduced, the attenuation of the optical signal will decrease accordingly under the same transmission distance conditions. If there is data flow blockage in the optical cable, the data flow blockage will be alleviated after the transmission frequency of the optical signal is reduced, and the attenuation of the optical signal will decrease. If there is a fault in the optical cable, the attenuation of the optical signal will not change due to the change in the frequency of the optical signal.

[0085] Specifically, under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission power based on the attenuation difference includes:

[0086] Subtracting the first optical signal attenuation from the first preset optical signal attenuation to obtain an attenuation difference;

[0087] Compare the attenuation difference with a preset attenuation difference of 2dB / km;

[0088] Based on the comparison result that the attenuation difference is greater than the preset attenuation difference of 2 dB / km, determining to adjust the transmission power;

[0089] Therein, several adjustment modes are set for the transmission power, and each adjustment mode has a different adjustment range for the transmission power.

[0090] Specifically, the difference between the attenuation and the preset attenuation is recorded as a first difference.

[0091] If the first difference is greater than a first preset difference of 1 dB / km, the transmission power is adjusted using a first power adjustment coefficient of 1.2;

[0092] If the first difference is less than or equal to the first preset difference of 1 dB / km, the transmission power is adjusted using a second power adjustment coefficient of 1.1.

[0093] Specifically, under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission rate based on the attenuation difference includes:

[0094] Compare the attenuation difference with a preset attenuation difference of 2dB / km;

[0095] Based on the comparison result that the attenuation difference is less than or equal to the preset attenuation difference of 2 dB / km, determining to adjust the transmission rate;

[0096] Therein, several adjustment modes are set for the transmission rate, and each adjustment mode has a different adjustment range for the transmission rate.

[0097] Specifically, the difference between the preset attenuation and the attenuation is recorded as the second difference.

[0098] If the second difference is greater than a second preset difference of 0.5 dB / km, the transmission rate is adjusted using a first rate adjustment coefficient of 0.95;

[0099] If the second difference is less than or equal to the second preset difference of 0.5 dB / km, the transmission rate is adjusted using the first rate adjustment coefficient of 0.98.

[0100] Specifically, the present invention is based on the offsetting of the electrical signal emitted by the self-excitation unit and the electrical signal emitted by the optical transmitter to reduce the transmission frequency of the optical signal converted from the electrical signal, calculates the attenuation of the second optical signal based on the reduced transmission frequency, and compares it with the attenuation of the first optical signal. If the attenuation of the second optical signal is less than the attenuation of the first optical signal, it indicates that there is data flow obstruction in the optical cable, thereby affecting the communication quality. In this case, the transmission power of the optical signal is appropriately increased or the transmission rate is reduced to reduce the signal attenuation. If the attenuation of the second optical signal is greater than or equal to the attenuation of the first optical signal, it indicates that there is a fault in the optical cable, thereby affecting the communication quality, and the fault needs to be further determined.

[0101] Specifically, under the condition that it is determined that there is an optical cable fault, the process of determining whether the optical fiber has a fault based on the bit error rate includes:

[0102] comparing the bit error rate with a preset bit error rate;

[0103] If the bit error rate is greater than the preset bit error rate, it is determined that the optical fiber has a fault;

[0104] If the bit error rate is less than or equal to the preset bit error rate, it is determined that there is no fault in the optical fiber.

[0105] Specifically, the preset bit error rate is determined according to the specification of the optical fiber and the data transmission distance.

[0106] Specifically, the process of determining whether a comprehensive detection is required based on the bit error rate difference includes:

[0107] Comparing the bit error rate difference with a preset bit error rate difference;

[0108] If the bit error rate difference is greater than the preset bit error rate difference of 0.1%, it is determined that a comprehensive inspection of the optical fiber is required and an early warning is issued;

[0109] If the bit error rate difference is less than or equal to the preset bit error rate difference of 0.1%, it is determined that there is no need to perform a comprehensive inspection on the optical fiber.

[0110] Specifically, the process of determining the adjustment amplitude for the first preset optical signal attenuation amount based on the bit error rate difference percentage includes:

[0111] Subtract the bit error rate difference from the preset bit error rate difference of 0.1% to obtain a difference, and record the ratio of the difference to the preset bit error rate difference as the bit error rate difference percentage;

[0112] If the bit error rate difference percentage is greater than a preset bit error rate difference percentage of 20%, determining to use a first adjustment coefficient of 1.05 to adjust the first preset optical signal attenuation;

[0113] If the bit error rate difference percentage is less than or equal to the preset bit error rate difference percentage of 20%, it is determined to use the second adjustment coefficient of 1.02 to adjust the first preset optical signal attenuation.

[0114] See also Figure 2 As shown, it is a structural block diagram of a fault diagnosis system for a core bundle tube type OPGW optical cable in an embodiment of the present invention.

[0115] The embodiment of the present invention further provides a fault diagnosis system for a central bundle tube OPGW optical cable, comprising:

[0116] A bit error rate monitoring unit, which is located in the optical receiver and is used to monitor the bit error rate of the optical cable;

[0117] A self-excitation unit, which is located in the optical transmitter and is used to change the transmission frequency of the optical signal in the optical cable;

[0118] An optical signal attenuation monitoring unit, which is located in the optical receiver and is used to monitor the optical signal attenuation of the optical cable;

[0119] A central control unit is respectively connected to the bit error rate monitoring unit, the self-excitation unit and the optical signal attenuation monitoring unit, and is used to determine whether the communication quality of the optical cable meets the standard according to the first optical signal attenuation, and calculate the second optical signal attenuation under the condition that the communication quality of the optical cable does not meet the standard, and determine the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the first optical signal attenuation and the second optical signal attenuation, and adjust the parameters of the optical signal according to the reason, or determine the faulty optical fiber, and, under the condition that it is determined that there is no need to fully detect the optical fiber, determine the adjustment amplitude for the first preset optical signal attenuation based on the bit error rate difference percentage.

[0120] Specifically, the bit error rate monitoring unit includes a bit error rate tester, and the specific model and parameters are not limited.

[0121] Specifically, the self-excitation unit includes a self-excited oscillation circuit, and the design parameters of the circuit are determined according to the electrical signal strength of the optical transmitter, and are not specifically limited.

[0122] Specifically, the optical signal attenuation monitoring unit includes an optical power meter, and the specific model and parameters are not limited.

[0123] Specifically, the present invention detects the bit error rate of the single-mode optical fiber under the condition that a fault exists in the optical cable, compares it with the preset bit error rate to determine the faulty optical fiber, and determines the degree of fault of the optical fiber according to the bit error rate difference. A replacement warning is issued for the optical fiber with a high degree of fault, and a first preset optical signal attenuation is reduced for the optical fiber with a low degree of fault that does not affect communication needs, and the adjustment amplitude is determined according to the bit error rate difference percentage.

[0124] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for diagnosing a fault of a central beam tube OPGW optical cable, characterized in that: include: Determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal of the optical cable, and starting the self-excitation unit to reduce the transmission frequency of the optical signal in the optical cable under the condition that the communication quality of the optical cable does not meet the standard, and calculating the attenuation of the second optical signal of the optical cable based on the transmission frequency of the reduced optical signal; Determine the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal, and determine to adjust the transmission power or transmission rate of the optical signal based on the attenuation difference if it is determined that the communication quality does not meet the standard because of data flow obstruction in the optical cable; Under the condition that it is determined that the communication quality does not meet the standard due to a fault in the optical cable, the bit error rate of each optical fiber is detected, whether the optical fiber is faulty is determined based on the bit error rate, and whether a comprehensive inspection of the optical fiber is required is determined based on the bit error rate difference, and, under the condition that it is determined that a comprehensive inspection is not required, the adjustment amplitude for the first preset optical signal attenuation is determined based on the bit error rate difference percentage.

2. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 1, characterized in that: The process of determining whether the communication quality of the optical cable meets the standard based on the attenuation of the first optical signal includes: comparing the first optical signal attenuation with a first preset optical signal attenuation; If the attenuation of the first optical signal is greater than the first preset attenuation of the optical signal, determining that the communication quality of the optical cable does not meet the standard; If the attenuation of the first optical signal is less than or equal to the first preset attenuation of the optical signal, it is determined that the communication quality of the optical cable meets the standard.

3. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 2, characterized in that: The calculation formula of optical signal attenuation is as follows: Wherein, L represents the attenuation of the optical signal, P1 represents the optical power at the input end of the optical cable, and P2 represents the optical power at the output end of the optical cable.

4. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 3, characterized in that: The process of determining the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the attenuation of the first optical signal and the attenuation of the second optical signal includes: comparing the attenuation of the first optical signal with the attenuation of the second optical signal; If the attenuation of the first optical signal is greater than the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is data flow obstruction in the optical cable; If the attenuation of the first optical signal is less than or equal to the attenuation of the second optical signal, it is determined that the reason why the communication quality of the optical cable does not meet the standard is that there is a fault in the optical cable.

5. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 4, characterized in that: Under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission power based on the attenuation difference includes: Subtracting the first optical signal attenuation from the first preset optical signal attenuation to obtain an attenuation difference; Comparing the attenuation difference with a preset attenuation difference; Based on a comparison result that the attenuation difference is greater than the preset attenuation difference, determining to adjust the transmission power; Therein, several adjustment modes are set for the transmission power, and each adjustment mode has a different adjustment range for the transmission power.

6. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 5, characterized in that: Under the condition that it is determined that the data flow is blocked, the process of determining to adjust the transmission rate based on the attenuation difference includes: Comparing the attenuation difference with a preset attenuation difference; Based on a comparison result that the attenuation difference is less than or equal to the preset attenuation difference, determining to adjust the transmission rate; Therein, several adjustment modes are set for the transmission rate, and each adjustment mode has a different adjustment range for the transmission rate.

7. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 4, characterized in that: Under the condition that it is determined that there is an optical cable fault, the process of determining whether the optical fiber has a fault based on the bit error rate includes: comparing the bit error rate with a preset bit error rate; If the bit error rate is greater than the preset bit error rate, it is determined that the optical fiber has a fault; If the bit error rate is less than or equal to the preset bit error rate, it is determined that there is no fault in the optical fiber.

8. The method for diagnosing faults of a central beam tube OPGW optical cable according to claim 7, characterized in that: The process of determining whether a comprehensive test is required based on the bit error rate difference includes: Comparing the bit error rate difference with a preset bit error rate difference; If the bit error rate difference is greater than the preset bit error rate difference, it is determined that a comprehensive inspection of the optical fiber is required and an early warning is issued; If the bit error rate difference is less than or equal to the preset bit error rate difference, it is determined that there is no need to perform a comprehensive inspection on the optical fiber.

9. The method for diagnosing a fault of a central beam tube OPGW optical cable according to claim 8, characterized in that: The process of determining the adjustment amplitude for the first preset optical signal attenuation based on the bit error rate difference percentage includes: Subtract the bit error rate difference from the preset bit error rate difference to obtain a difference, and record the ratio of the difference to the preset bit error rate difference as a bit error rate difference percentage; If the bit error rate difference percentage is greater than a preset bit error rate difference percentage, determining to use a first adjustment coefficient to adjust the first preset optical signal attenuation amount; If the bit error rate difference percentage is less than or equal to the preset bit error rate difference percentage, it is determined to use a second adjustment coefficient to adjust the first preset optical signal attenuation.

10. A central beam tube type OPGW optical cable fault diagnosis system using the central beam tube type OPGW optical cable fault diagnosis method according to any one of claims 1 to 9, characterized in that: include: A bit error rate monitoring unit, which is located in the optical receiver and is used to monitor the bit error rate of the optical cable; A self-excitation unit, which is located in the optical transmitter and is used to change the transmission frequency of the optical signal in the optical cable; An optical signal attenuation monitoring unit, which is located in the optical receiver and is used to monitor the optical signal attenuation of the optical cable; A central control unit is respectively connected to the bit error rate monitoring unit, the self-excitation unit and the optical signal attenuation monitoring unit, and is used to determine whether the communication quality of the optical cable meets the standard according to the first optical signal attenuation, and calculate the second optical signal attenuation under the condition that the communication quality of the optical cable does not meet the standard, and determine the reason why the communication quality of the optical cable does not meet the standard based on the comparison result of the first optical signal attenuation and the second optical signal attenuation, and adjust the parameters of the optical signal according to the reason, or determine the faulty optical fiber, and, under the condition that it is determined that there is no need to fully detect the optical fiber, determine the adjustment amplitude for the first preset optical signal attenuation based on the bit error rate difference percentage.

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