Online monitoring device for performance degradation test of optical fiber link for nuclear power

Abstract

The invention belongs to the technical field of optical fiber device performance degradation tests, and particularly relates to an online monitoring device for a nuclear power optical fiber link performance degradation test. Comprising a minimization module of the nuclear power decentralized control system, an optical signal transmission link module, an optical signal conversion module and an upper computer workstation, the minimization module of the nuclear power decentralized control system is connected with the optical signal transmission link module through an LC / LC optical fiber connector, and the optical signal transmission link module is connected with the optical signal conversion module through ST / LC. The optical signal conversion module is connected with an upper computer work station through a network cable, and the upper computer work station is connected with a minimization module of the nuclear power decentralized control system through a network cable. The method has the beneficial effects that the aging test object is changed from the traditional optical fiber patch cord to all parts on the whole optical fiber link in combination with the optical fiber use environment of the nuclear power DCS field, so that the test conclusion is more representative.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber device performance degradation test, and in particular relates to an online monitoring device for optical fiber link performance degradation test for nuclear power. Background Art

[0002] Optical fiber and optical fiber connectors are widely used in various application environments due to their advantages such as large communication capacity, low signal interference, anti-electromagnetic interference, no radiation, small size, light weight, and long life. Optical fiber has also been widely used in nuclear power DCS equipment. Domestic mainstream DCS manufacturers all use optical fiber to achieve communication functions within and between DCS cabinets. However, it has the disadvantages of brittle texture, poor mechanical strength, small bending radius, and easy damage to the optical end face, which will also cause the transmission quality to decline or even interrupt the transmission. Therefore, the study of the performance degradation and aging mechanism of optical fiber devices is of great practical significance.

[0003] The traditional fiber aging test method performs environmental stress aging test on the fiber sample. Before the test, the insertion loss and return loss of the tested fiber are detected by instruments. After a series of aging tests such as high temperature aging and temperature cycling, the insertion loss and return loss of the fiber are detected again. This test method has the following disadvantages:

[0004] 1. Other components on the optical fiber link are not considered, and the on-site environment of optical fiber application is out of consideration. Optical fiber generally needs to be combined with other components, such as optical fiber adapters, photoelectric converters, optical modules, etc., to form an optical fiber link to achieve signal transmission function. The traditional optical fiber aging test method only performs aging tests on optical fibers, and does not consider other functional components on the optical fiber link.

[0005] 2. Offline detection of optical fiber aging performance can only obtain optical fiber performance degradation data before and after the test. It is difficult to obtain the process data of optical fiber performance degradation, and it is impossible to establish an accurate mathematical model of optical fiber performance degradation over time.

[0006] 3. It is difficult to determine the loss threshold at which the optical fiber degrades to the point of being unusable in actual application scenarios. The loss threshold at which the optical fiber performance degrades to the point of being unusable is different in different application scenarios. Traditional test methods cannot determine the loss threshold at which the optical fiber performance degrades to the point of being unusable in a specific application scenario.

[0007] Existing fiber aging test methods focus on studying the performance degradation of optical fibers before and after aging tests, without considering the impact of aging of other components in the optical fiber link on signal transmission performance. It is difficult to determine the loss threshold when the optical fiber degrades to the point of being unusable in actual application scenarios. Summary of the invention

[0008] The purpose of the present invention is to provide an online monitoring device for optical fiber link performance degradation test for nuclear power, which can monitor the optical fiber link performance degradation data during the aging test in real time online, obtain the loss threshold when the optical fiber degrades to unusable in actual application scenarios, and provide a basis for preventive maintenance of optical fiber components at nuclear power sites.

[0009] The technical solution of the present invention is as follows: an online monitoring device for a nuclear power optical fiber link performance degradation test, comprising a nuclear power distributed control minimization system, an optical signal transmission link module, an optical signal conversion module and a host computer workstation, the nuclear power distributed control minimization system is connected to the optical signal transmission link module via an LC / LC optical fiber connector, the optical signal transmission link module is connected to the optical signal conversion module via ST / LC, the optical signal conversion module is connected to the host computer workstation via a network cable, and the host computer workstation is connected to the nuclear power distributed control minimization system via a network cable.

[0010] The nuclear power decentralized control minimization system includes an AC / DC power conversion module, two photoelectric conversion modules, and two DCS main controllers, and its function is to simulate the actual communication signal data generated by the nuclear power DCS and convert it into a standard optical signal, and then inject the optical signal into the transmission link.

[0011] The function of the AC / DC power conversion module is to convert the external 220V alternating current into 42V direct current as the working power supply of the photoelectric conversion module and the DCS main controller card. A minimized control program runs in the DCS main controller to provide the photoelectric conversion module with a continuous and stable network signal value consistent with the nuclear power site. The control program of the DCS main controller generates a fixed reactor primary circuit average temperature value and reactor electric power value through a fixed data generation module and transmits them to the output module; the self-diagnosis module of the DCS main controller determines the working status of the DCS main controller in real time and generates a signal quality code and transmits it to the output module; the clock module of the DCS main controller generates a real-time time signal and transmits it to the output module; the output module transmits the above signal value to the photoelectric conversion module through the optical fiber link system.

[0012] The optical signal transmission link module includes an optical signal transmission link system consisting of a splitter, an optical fiber connector, an optical fiber fusion box, and an optical cable. The two photoelectric conversion modules of the nuclear power decentralized control minimization system are respectively connected to the splitter through an LC / LC optical fiber connector, the splitter is connected to the optical fiber fusion box through an ST / LC optical fiber connector, the optical fiber fusion box is connected to another optical fiber fusion box through an optical fiber, and the optical fiber fusion box is connected to the optical signal conversion module through an ST / LC optical fiber connector.

[0013] The optical signal transmission link module is placed as an aging object in a high temperature and high humidity aging test box.

[0014] The optical signal conversion module comprises an optical module and a switch. The optical module is installed on the optical module interface of the switch. The switch converts the optical signal into a network signal and monitors the power of the optical signal received by the optical module.

[0015] A test data analysis system is installed on the host computer workstation.

[0016] The test data analysis system comprises test data analysis software running in a host computer workstation, the test data analysis software comprises a time series database, a data analysis processing program and a human-machine interface, the time series database receives in real time the real nuclear power process signal value sent by the nuclear power decentralized control minimization system to the optical fiber link, the optical signal power data sent by the optical module and the communication signal data value sent by the switch, these data values ​​are recorded in the time series database at a frequency of 10 Hz, the data analysis processing program reads the data in the time series database in real time, subtracts the real value from the transmission value to obtain result 1, takes the absolute value of result 1 to obtain result 2, divides result 2 by the real value to obtain result 3, if result 3 does not exceed 5%, it is considered that the deviation between the real value and the transmission value is within the allowable range, and the optical fiber link transmission signal is normal; if result 3 exceeds 5%, it is considered that the deviation between the real value and the transmission value exceeds the allowable range, and the optical fiber link transmission signal is abnormal.

[0017] The beneficial effects of the present invention are as follows: 1. In combination with the optical fiber use environment at the nuclear power DCS site, the aging test object is changed from the traditional optical fiber jumper to all components on the entire optical fiber link, making the test conclusion more representative. 2. By using the method of online monitoring of optical fiber aging parameters, the optical fiber performance degradation data during the test is obtained, and a mathematical model of the degradation of optical fiber link performance over time is established. 3. Through experiments, the loss threshold when the optical fiber degrades to unusable in actual application scenarios is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram of the architecture of an online monitoring device for a nuclear power optical fiber link performance degradation test provided by the present invention;

[0019] Figure 2 It is the function diagram of the minimized control program running in the DCS main controller;

[0020] Figure 3 This is the functional diagram of the test data analysis system installed on the host workstation;

[0021] Figure 4 A processing function flow chart of the data analysis processing program;

[0022] Figure 5 This is the image after fitting according to the example of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, an online monitoring device for a nuclear power optical fiber link performance degradation test includes a minimized module of a nuclear power distributed control system, an optical signal transmission link module, an optical signal conversion module and a host computer workstation. The minimized module of the nuclear power distributed control system is connected to the optical signal transmission link module through an LC / LC optical fiber connector, the optical signal transmission link module is connected to the optical signal conversion module through ST / LC, the optical signal conversion module is connected to the host computer workstation through a network cable, and the host computer workstation is connected to the minimized module of the nuclear power distributed control system through a network cable.

[0025] The minimized module of the nuclear power distributed control system includes an AC / DC power conversion module, two photoelectric conversion modules, and two DCS main controller cards. Its function is to simulate the actual communication signal data generated by the nuclear power DCS and convert it into a standard optical signal, and then inject the optical signal into the transmission link. Among them, the function of the AC / DC power conversion module is to convert the external 220V alternating current into 42V direct current as the working power supply for the photoelectric conversion module and the DCS main controller card. A minimized control program runs in the DCS main controller, and its main function is to provide the photoelectric conversion module with a continuous and stable network signal value consistent with the nuclear power site. The function diagram of the minimized control program running in the DCS main controller card is shown in the figure below. Figure 2 As shown, the fixed data generation module generates fixed reactor primary circuit average temperature value and reactor electric power value inside the control program and transmits them to the output module; the self-diagnosis module of the DCS main controller determines the working condition of the DCS main controller in real time and generates a signal quality code and transmits it to the output module; the clock module of the DCS main controller generates a real-time time signal and transmits it to the output module; the output module transmits the above signal value to the photoelectric conversion module through the optical fiber link system. The photoelectric conversion module converts the optical signal into a communication signal and transmits it to the switch. The test data analysis system running on the workstation receives in real time the real nuclear power process signal sent by the nuclear power decentralized control minimization system to the optical fiber link, the optical signal power signal sent by the optical signal conversion module, and the communication signal sent by the switch.

[0026] The optical signal transmission link module includes an optical signal transmission link system consisting of a splitter, a fiber optic connector, a fiber optic splicing box, and an optical cable. The two photoelectric conversion modules of the minimized module of the nuclear power distributed control system are connected to the splitter through LC / LC fiber optic connectors, the splitter is connected to the fiber optic splicing box through ST / LC fiber optic connectors, the fiber optic splicing box is connected to another fiber optic splicing box through optical fibers, and the fiber optic splicing box is connected to the optical signal conversion module through ST / LC fiber optic connectors. The optical signal transmission link module is placed as an aging object in a high temperature and high humidity aging test chamber.

[0027] The optical signal conversion module includes an optical module and a switch. The optical module is installed on the optical module interface of the switch. The switch converts the optical signal into a network signal and monitors the power of the optical signal received by the optical module.

[0028] The host computer workstation is equipped with a test data analysis system, whose function diagram is shown in the figure below. Figure 3 As shown. The test data analysis system includes test data analysis software, which runs in the host computer workstation. The test data analysis software includes a time series database, a data analysis processing program and a human-machine interface. The time series database receives in real time the real nuclear power process signal value (hereinafter referred to as DCS signal) sent by the nuclear power decentralized control minimization system to the optical fiber link, the optical signal power data (hereinafter referred to as optical power signal) sent by the optical signal conversion module and the communication signal data value (hereinafter referred to as switch signal) sent by the switch. These data values ​​are recorded in the time series database at a frequency of 10Hz. The data analysis processing program reads the data in the time series database in real time, subtracts the real value from the transmission value to obtain result 1, takes the absolute value of result 1 to obtain result 2, and divides result 2 by the real value to obtain result 3. If result 3 does not exceed 5%, it is considered that the deviation between the real value and the transmission value is within the allowable range, and the optical fiber link transmission signal is normal; if result 3 exceeds 5%, it is considered that the deviation between the real value and the transmission value exceeds the allowable range, and the optical fiber link transmission signal is abnormal. The difference and absolute value of the DCS signal data value and the switch signal data value are calculated, and then the calculation result is divided by the DCS signal data value at this time. If the calculation result does not exceed 5%, it is considered that the deviation between the DCS signal data value and the switch signal data value is within the allowable range, and the optical fiber link transmission signal is normal; if the calculation result exceeds 5%, it is considered that the deviation between the DCS signal data value and the switch signal data value exceeds the allowable range, and the optical fiber link transmission signal is abnormal. The processing function flow chart of the data analysis processing program is as follows Figure 4 The human-machine interface displays the DCS signal value, optical power signal value and switch signal value in real time, and provides the start, pause and stop functions of the test data analysis system program.

[0029] For the communication signal data sent by the minimized module of the nuclear power distributed control system and the communication signal data sent by the switch, the data structure recorded in the time series database is shown in Table 1.

[0030] Table 1 Data structure of process signal data

[0031]

[0032] For the optical power signal data in the signal acquisition function module, the recorded data structure is shown in Table 2.

[0033] Table 2 Data structure of optical power signal data

[0034]

[0035] An online monitoring method for a nuclear power optical fiber link performance degradation test comprises the following steps:

[0036] Step 1: Follow Figure 1 The test system is built as shown, and the optical fiber link under test is placed in a high and low temperature test chamber.

[0037] Step 2: The nuclear power decentralized control minimization system sends the real nuclear power process signal value to the optical fiber link. The signal is received by the optical module and the switch after passing through the optical fiber link. At the same time, the optical module can detect the optical power value in the optical fiber link.

[0038] Step 3: The test data processing and analysis system running in the workstation collects and stores the real nuclear power process signal value sent by the nuclear power distributed control minimization system to the optical fiber link (hereinafter referred to as the DCS signal), the optical signal power data sent by the optical signal conversion module (hereinafter referred to as the optical power signal), and the communication signal data value sent by the switch (hereinafter referred to as the switch signal) at a frequency of 10HZ.

[0039] Step 4: The data analysis program calculates the absolute value of the difference between the DCS signal data value and the switch signal data value in real time, and then divides the calculation result by the DCS signal data value at this time. If the calculation result does not exceed 5%, it is considered that the deviation between the DCS signal data value and the switch signal data value is within the allowable range, and the optical fiber link transmission signal is normal; if the calculation result exceeds 5%, it is considered that the deviation between the DCS signal data value and the switch signal data value exceeds the allowable range, and the optical fiber link transmission signal is abnormal. During the initialization phase of the test, the optical fiber link transmits the signal losslessly, and the DCS signal data value and the switch signal data value should be exactly the same. As the optical fiber link ages, the transmission performance decreases. The test is stopped 1 second after the DCS signal data value and the switch signal data value first deviate by more than 5%. The optical power value at this time is defined as the optical fiber unavailable threshold in the actual application scenario.

[0040] Step 5: After the test is completed, the test data is processed to obtain an aging relationship model between the optical fiber link and thermal stress.

[0041] Embodiment 1:

[0042] according to Figure 1 The test system is constructed as shown.

[0043] Confirm the initial test conditions: connect the 220VAC power supply to the AC / DC power module in module 1, and the DCS main controller card and photoelectric conversion module in module 1 are working in normal operation.

[0044] The test personnel operate module 4 - the test control software of the host computer workstation to control the nuclear power distributed control minimization system to output the nuclear power plant process signal value.

[0045] The test personnel confirmed in the test control software of module 4-host workstation that the read-back nuclear power plant process signal value was consistent with the output value.

[0046] The test personnel confirm that the optical signal power value read is within the normal range in the test control software of module 4-host workstation.

[0047] Start the high temperature test chamber, raise the temperature of the test chamber to 35°C and maintain it. The test control software of the host workstation continuously records the nuclear power plant process signal value (with quality code), optical signal power value and readback time at a frequency of 10HZ.

[0048] The test is stopped 1 second after the DCS signal data value and the switch signal data value deviate by more than 5% for the first time. The optical power value collected at this time is the optical power threshold at which the optical link is unavailable.

[0049] During the entire test process, the quality code data value should be guaranteed to be 1. If the quality code data is 0, it is considered that the CPU is working in an abnormal state and the test is invalid.

[0050] Take out the tested optical fiber, optical cable, splitter, and fusion box, and replace them with new ones of the same model. Re-execute the test steps of this embodiment, but set the test box temperature to 45°C, 55°C, 65°C, 75°C, 85°C, and 95°C before starting the high-temperature test box. Each time the test is re-executed, the tested object in the high-temperature box needs to be replaced with a new one of the same model. After the test is completed, the change in optical power at different temperatures is obtained.

[0051] The following method is used to fit the test data to determine the degradation rate. Based on the collected test data, the degradation rate of the optical fiber is calculated. The degradation rate can be defined as the rate of change of optical power over time, that is: Degradation rate , where ΔP is the change in optical power and ΔT is the change in time.

[0052] Linear fitting. The Arrhenius equation is used to describe the variation trend of degradation rate k(T) with temperature T:

[0053] (1)

[0054] Where: k(T) is the degradation rate at temperature T, A is the frequency factor, Ea is the activation energy, k Bis the Boltzmann constant and T is the thermodynamic temperature (Kelvin).

[0055] Logarithmize equation (1) and transform it into linear equation (2):

[0056] (2)

[0057] choose As an independent variable, As dependent variables, the polyfit function was used to perform linear fitting in MATLAB software based on the experimental results to determine the frequency factor A and activation energy Ea, and the functional relationship between the degradation rate and the working environment temperature was obtained.

[0058] Embodiment 2:

[0059] according to Figure 1 The test system is constructed as shown.

[0060] Confirm the initial conditions of the test: connect the 220VAC power supply to the AC / DC power module in module 1, and the DCS main controller card and the photoelectric conversion module in module 1 are working in normal operation. In this example, the normal operation state is defined as the power light of the DCS main controller card and the photoelectric conversion module is on, and the fault light is off.

[0061] The test personnel operate the test control software of module 4-host workstation to control the nuclear power decentralized control minimization system to output the nuclear power plant process signal value. In this example, the nuclear power plant process signal value can be defined as the average temperature of the reactor primary loop: 300.5℃ and the reactor thermal power: 1100.5MW.

[0062] The test personnel confirmed in the test control software of module 4-host workstation that the read-back nuclear power plant process signal value is consistent with the output value, and the quality code is 1. In this example, the read-back nuclear power plant process signal value is the average temperature of the reactor primary loop: 300.5℃ and the reactor power: 1100.5MW, and the read-back quality code is 1.

[0063] The test personnel confirm in the test control software of module 4-host workstation that the optical signal power value read is within the normal range. In this example, the normal range is between -10dbm and -50dbm.

[0064] Start the high-temperature test chamber, raise the temperature of the test chamber to 308.15K and maintain it. The test control software of the host workstation continuously records the nuclear power plant process signal value (with quality code), optical signal power value and readback time at a frequency of 10HZ. The test start time is recorded as 1ms, and data is recorded every 100ms thereafter.

[0065] The test is stopped 1 second after the DCS signal data value and the switch signal data value first deviate by more than 5%. The optical power value collected at this time is the optical power threshold value at which the optical link is unavailable. In this example, some of the recorded data are shown in Table 3 below. At 1394757000 milliseconds, the DCS signal data value and the switch signal data value deviate by more than 5% for the first time. The test is stopped 1 second later. The optical power value collected at this time is -25.3dbm, which is the optical power threshold value at which the optical link is unavailable.

[0066] Table 3 Test data at 308.15K aging temperature

[0067]

[0068] Take out the tested optical fiber, optical cable, splitter, and fusion box, and replace them with new ones of the same model. Re-execute the test steps of this embodiment, but set the test box temperature to 318.15K, 328.15K, 338.15K, 348.15K, 358.15K, and 368.15K in the temperature adjustment link before starting the high-temperature test box. Each time the test is re-executed, the tested object in the high-temperature box needs to be replaced with a new one of the same model. After the test is completed, the change in optical power at different temperatures is obtained.

[0069] The following method is used to fit the test data to obtain the functional relationship between the degradation rate and the working environment temperature.

[0070] Determine the degradation rate K. Based on the collected test data, the degradation rate of the optical fiber is calculated by the linear fitting method. The obtained time t is used as the independent variable, the optical signal power value P is used as the dependent variable, the degradation rate is K, the linear fitting deviation is B, and the polyfit function of the Matlab software is used to perform a first-order linear fit. In this example, based on the obtained data, the linear fitting method is used to obtain the degradation rate K1=-0.75*10 at an aging temperature of 35°C. -5 dbm / s. According to the obtained data, the degradation rates at aging temperatures of 45°C, 55°C, 65°C, 75°C, 85°C, and 95°C are shown in Table 4 below:

[0071] Table 4 Degradation rate at different aging temperatures

[0072]

[0073] The Arrhenius equation is used to describe the variation trend of degradation rate k(T) with temperature T:

[0074] (1)

[0075] Where: k(T) is the degradation rate at temperature T, A is the frequency factor, Ea is the activation energy, k B is the Boltzmann constant, k B =1.38*10 -23 J / K. T is the thermodynamic temperature in Kelvin.

[0076] Logarithmize equation (1) and transform it into linear equation (2):

[0077] (2)

[0078] According to the requirements of formula (2), the data in Table 4 are transformed to convert the temperature T (unit Kelvin) into ,Will Transformed to , we get the following table 5

[0079] Table 5 Degradation rate at different aging temperatures

[0080]

[0081] choose As an independent variable, As the dependent variable, a linear fit is performed using the polyfit function in MATLAB software based on the experimental results. In this example, the fitted image is shown in Figure 5 According to the fitted parameters, the variation trend of the degradation rate k(T) with temperature T is shown in formula (3).

[0082] (3)

[0083] According to formula (3), the degradation rate of the optical transmission link at other working environment temperatures can be calculated, the frequency factor A and the activation energy Ea can be determined, and the functional relationship between the degradation rate and the working environment temperature can be obtained.

Claims

1. An online monitoring device for optical fiber link performance degradation test for nuclear power, characterized in that: It includes a nuclear power distributed control minimization system, an optical signal transmission link module, an optical signal conversion module and a host computer workstation. The nuclear power distributed control minimization system is connected to the optical signal transmission link module through an LC / LC optical fiber connector, the optical signal transmission link module is connected to the optical signal conversion module through ST / LC, the optical signal conversion module is connected to the host computer workstation through a network cable, and the host computer workstation is connected to the nuclear power distributed control minimization system through a network cable.

2. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 1, characterized in that: The nuclear power decentralized control minimization system includes an AC / DC power conversion module, two photoelectric conversion modules, and two DCS main controllers, and its function is to simulate the actual communication signal data generated by the nuclear power DCS and convert it into a standard optical signal, and then inject the optical signal into the transmission link.

3. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 2, characterized in that: The function of the AC / DC power conversion module is to convert the external 220V alternating current into 42V direct current as the working power supply of the photoelectric conversion module and the DCS main controller card. A minimized control program runs in the DCS main controller to provide the photoelectric conversion module with a continuous and stable network signal value consistent with the nuclear power site. The control program of the DCS main controller generates a fixed reactor primary circuit average temperature value and reactor electric power value through a fixed data generation module and transmits them to the output module; the self-diagnosis module of the DCS main controller determines the working status of the DCS main controller in real time and generates a signal quality code and transmits it to the output module; the clock module of the DCS main controller generates a real-time time signal and transmits it to the output module; the output module transmits the above signal value to the photoelectric conversion module through the optical fiber link system.

4. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 2, characterized in that: The optical signal transmission link module includes an optical signal transmission link system consisting of a splitter, an optical fiber connector, an optical fiber fusion box, and an optical cable. The two photoelectric conversion modules of the nuclear power decentralized control minimization system are respectively connected to the splitter through an LC / LC optical fiber connector, the splitter is connected to the optical fiber fusion box through an ST / LC optical fiber connector, the optical fiber fusion box is connected to another optical fiber fusion box through an optical fiber, and the optical fiber fusion box is connected to the optical signal conversion module through an ST / LC optical fiber connector.

5. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 4, characterized in that: The optical signal transmission link module is placed as an aging object in a high temperature and high humidity aging test box.

6. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 1, characterized in that: The optical signal conversion module comprises an optical module and a switch. The optical module is installed on the optical module interface of the switch. The switch converts the optical signal into a network signal and monitors the power of the optical signal received by the optical module.

7. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 1, characterized in that: A test data analysis system is installed on the host computer workstation.

8. The on-line monitoring device for a nuclear power optical fiber link performance degradation test according to claim 7, characterized in that: The test data analysis system comprises test data analysis software running in a host computer workstation, the test data analysis software comprises a time series database, a data analysis processing program and a human-machine interface, the time series database receives in real time the real nuclear power process signal value sent by the nuclear power decentralized control minimization system to the optical fiber link, the optical signal power data sent by the optical module and the communication signal data value sent by the switch, these data values ​​are recorded in the time series database at a frequency of 10 Hz, the data analysis processing program reads the data in the time series database in real time, subtracts the real value from the transmission value to obtain result 1, takes the absolute value of result 1 to obtain result 2, divides result 2 by the real value to obtain result 3, if result 3 does not exceed 5%, it is considered that the deviation between the real value and the transmission value is within the allowable range, and the optical fiber link transmission signal is normal; if result 3 exceeds 5%, it is considered that the deviation between the real value and the transmission value exceeds the allowable range, and the optical fiber link transmission signal is abnormal.

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