Optical fiber communication test method

Abstract

The invention discloses an optical fiber communication test method, and relates to the technical field of communication, and the method comprises the steps: inputting a corresponding test signal into a to-be-tested optical fiber based on a test set, and obtaining a feedback signal; based on the physical information of the to-be-tested optical fiber and the test signals in the test set, theoretical propagation time consumption of the test signals is determined, if the propagation time length in the feedback signals is smaller than the theoretical propagation time consumption, form judgment is conducted on the to-be-tested optical fiber according to the unmarked feedback signals and the test signals, and an optical fiber model is constructed; simulating the test mark signal according to the optical fiber model to obtain a feedback analog signal, and determining the position information of the fault point according to the feedback analog signal; and if the propagation duration in the feedback signal is greater than the theoretical propagation time consumption, performing statistical judgment on the test signal to obtain a special item, performing simulation judgment on the optical fiber model based on the special item, and determining a fault point of the to-be-tested optical fiber. The method has the effect of improving the accuracy of the test result.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a method for testing optical fiber communication. Background Technology

[0002] Fiber optic communication technology, with its advantages of ultra-high bandwidth, low loss, and resistance to electromagnetic interference, has become the core transmission method of modern communication networks. With the rapid development of technologies such as 5G, cloud computing, and the Internet of Things, the scale and complexity of fiber optic networks continue to increase, placing higher demands on the performance testing and fault diagnosis of fiber optic links.

[0003] In related technologies, OTDR technology is used to collect scattered signals from transmitted optical signals, thereby obtaining the signal intensity of the scattered signals caused by the optical fiber material and structure during transmission. Then, by analyzing the collected scattered signal intensity using an OTDR trajectory diagram, the position of the sharp reflection peak in the OTDR trajectory diagram is taken as the corresponding fault point, thereby achieving the purpose of fault point location.

[0004] Regarding the aforementioned technologies, OTDRs require narrow-pulse optical signals for fiber optic measurements. While narrow-pulse signals improve detection accuracy, they reduce the detection length, resulting in limited detection distance. Similarly, while wide-pulse signals can increase detection distance, they reduce detection accuracy, leading to detection errors. Therefore, when performing long-distance fiber optic testing, the detection accuracy of OTDRs decreases, and the detection results are inaccurate, indicating areas for improvement. Summary of the Invention

[0005] To improve the accuracy of test results, this application provides a fiber optic communication test method.

[0006] This application provides a fiber optic communication testing method, which adopts the following technical solution:

[0007] A fiber optic communication testing method, comprising:

[0008] Test data is input into the optical fiber under test to obtain received data. The received data is compared with the test data to determine the integrity of the received data. If the received data is not complete, it is determined that there is a fault in the optical fiber under test, and the fault is located.

[0009] Once a fault point is determined in the optical fiber under test, the corresponding test signal is input into the optical fiber under test based on the test set to obtain the feedback signal from the receiving end.

[0010] The physical information of the optical fiber under test is obtained, and based on the physical information and the test signals in the test set, the theoretical propagation time of the test signal is determined. The theoretical propagation time of the test signal is compared with the propagation time of the corresponding feedback signal to determine whether there is a case in the feedback signal where the propagation time is less than the theoretical propagation time.

[0011] If the propagation time in the feedback signal is less than the theoretical propagation time, then the corresponding test signal and feedback signal are marked to obtain the test mark signal and the feedback mark signal.

[0012] The morphology of the optical fiber under test is determined based on the unlabeled feedback signal and the test signal to obtain the morphological data of the optical fiber, and an optical fiber model is constructed based on the morphological data.

[0013] The test marker signal is simulated based on the optical fiber model to obtain the feedback simulated signal. The feedback simulated signal is then compared with the feedback marker signal to determine the location information of the fault point.

[0014] If the propagation time in the feedback signal is greater than the theoretical propagation time, the test signal is divided into built-in groups to construct the fiber optic model under the corresponding group. The test signal and its feedback signal are then filtered based on the fiber optic model under the corresponding group to obtain special items. The special items are then simulated and analyzed to obtain the location information of the fault point of the fiber under test.

[0015] Preferably, the test signals in the test set refer to optical signals incident on the optical fiber under test at different incident angles.

[0016] Preferably, the propagation period of the corresponding test signal is determined based on the test signal, and the time required for the optical signal to propagate in the optical fiber under test with the corresponding propagation period is determined based on the three-dimensional data of the propagation period and the physical information in the optical fiber under test, so as to obtain the theoretical propagation time.

[0017] The theoretical propagation time is compared with the propagation time of the corresponding feedback signal to determine whether there is a case in the test signal where the theoretical propagation time is greater than the propagation time of the corresponding feedback signal.

[0018] Preferably, the propagation path of the test signal in the optical fiber is simulated based on the length data in the physical information of the unlabeled test signal and the optical fiber to obtain the test propagation path;

[0019] Based on the length data in the unlabeled feedback signal and the unlabeled information of the optical fiber, the propagation path of the feedback signal in the optical fiber is simulated to obtain the feedback propagation path.

[0020] Based on the theoretical propagation time and the actual propagation duration, the test propagation paths and feedback propagation paths of the corresponding test signals and feedback signals in the test set are compared to construct the propagation status of the test signals and feedback signals during the propagation process.

[0021] Based on big data, statistical judgment is made on the propagation of each test signal and its corresponding feedback signal in the test set during the propagation process. The propagation of the optical signal in each region of the optical fiber under test is determined, the morphological data of the optical fiber under test is obtained, and the corresponding optical fiber model is constructed based on the morphological data, so that the corresponding feedback signal can be simulated according to the test signal.

[0022] Preferably, the propagation period difference between the test signal and the feedback signal is calculated to obtain the period difference signal;

[0023] Based on the material properties in the physical information of the optical fiber under test, the bending range of the optical fiber under test is determined, and the bending range is matched based on the period difference signal to determine the bending range that the optical fiber under test can meet and the propagation distance under the corresponding bending range, thus obtaining the reflection variation range.

[0024] The time difference data between the theoretical propagation time and the actual propagation time is calculated, and the reflection variation range is filtered based on the time difference data to obtain the optical fiber signal propagation situation that simultaneously satisfies the period difference signal and the time difference data. The optical fiber signal propagation situation includes the test signal path, the bending path and the feedback signal path, and the test signal path, the bending path and the feedback signal path are used as the propagation situation of the corresponding test signal and feedback signal during the propagation process.

[0025] Preferably, the test marker signal is simulated based on the optical fiber model to obtain the feedback simulation signal output when the test marker signal propagates in the optical fiber under test;

[0026] The feedback marker signal is simulated inversely based on the fiber optic model to obtain the feedback marker path data;

[0027] The analog path data in the feedback analog signal is compared with the feedback marker path data to determine the common reflection point between the analog path data and the feedback marker path data;

[0028] The remaining test signals in the test set are input into the fiber optic model to obtain the comparison simulation signals corresponding to the test signals;

[0029] The simulated path data of each comparison simulation signal is matched with the common reflection point to determine the reflection point not included in the comparison simulation signal, and the location information corresponding to the non-included reflection point is recorded as the location information of the fault point.

[0030] Preferably, the test signals and their corresponding feedback signals in the test set are grouped based on the built-in groups to obtain corresponding test signal groups and feedback signal groups;

[0031] Based on the propagation duration, signal strength, and signal propagation period of the signals in the test signal group and the feedback signal group, fiber optic models of the corresponding groups are constructed to obtain fiber optic model groups.

[0032] Based on the built-in groups, the fiber model groups are compared with the fiber models in different groups to determine the fiber model with the largest proportion. This fiber model is then used as the fiber model of the fiber under test. The fiber model with the largest proportion is marked as the true fiber model, and the test signal groups and feedback signal groups corresponding to the other fiber models are marked as fake model group data.

[0033] The data of the fake model group is verified based on the real fiber optic model to identify special items in the fake model group data;

[0034] Based on the special terms, the test signal and feedback signal of the special terms are input into the true optical fiber model to obtain the corresponding true analog signal and true feedback analog signal. The propagation path of the true analog signal is compared with the propagation path of the true feedback analog signal to obtain the common reflection point.

[0035] The common reflection point is verified based on the propagation time of the feedback signal of the special item, the fault point of the fiber under test is determined, and the location information of the fault point is obtained.

[0036] Preferably, based on the common reflection point, a common reflection point is selected as the fault point, and the signal transmission of the fault point is simulated according to the true optical fiber model to determine the propagation time required for the test signal of the special item to pass through the fault point during transmission, and the simulated propagation time is obtained.

[0037] The simulated propagation time is compared with the propagation time of the feedback signal of the special item. If the simulated propagation time is the same as the propagation time of the feedback signal of the special item, the selected common reflection point is determined to be the fault point, and the location information of the fault point is obtained.

[0038] If the simulated propagation time is different from the propagation time of the feedback signal of the special item, the selected common reflection point is determined not to be a fault point. The common reflection point is then reselected until the simulated propagation time corresponding to the selected common reflection point is the same as the propagation time of the feedback signal of the special item.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] 1. By inputting test signals into the optical fiber under test using a test set and collecting the output signals, the theoretical propagation time of the test signals is determined based on the physical information of the optical fiber under test. The actual propagation time is compared with the theoretical propagation time to achieve the first screening of feedback signals, determining the feedback signals that the propagation path passes through the fault point. For feedback signals that can be obtained by judging the propagation time, the correct feedback signals are used to build an optical fiber model. The optical fiber model is then compared with the marked test signals to determine the location of the fault point. When the propagation time cannot filter out the required feedback signals, the special items that pass through the fault point are filtered out by analyzing the data characteristics of the feedback signals, thereby determining the location of the corresponding signal fault point. This improves the convenience and accuracy of fault point location judgment and reduces the testing cost of optical fiber communication testing.

[0041] 2. By using unlabeled test signals and their corresponding feedback signals, the propagation path of the corresponding signals in normal optical fibers is determined. Then, based on the theoretical propagation time and the actual propagation duration, the propagation process of the optical signal transforming from a test signal to a feedback signal is determined. By statistically judging the propagation process of a large number of test signals and their feedback signals, the propagation status of the optical signal in various regions of the optical fiber under test is determined. This allows the optical fiber model constructed based on the propagation status to more accurately reflect the shape of the real optical fiber model, improving the accuracy of fault location judgment based on the optical fiber model. At the same time, the constructed optical fiber model transforms the microscopic material properties of the optical fiber into macroscopic changes, improving the accuracy of the optical fiber model and further improving the accuracy of fault location judgment.

[0042] 3. By comprehensively utilizing the bending characteristics of optical fiber materials, the maximum bending condition achievable by the bending path is determined. The bending degree is matched using period difference signals to determine the fiber bending degree and length that can convert the propagation period of the test signal into the propagation period of the feedback signal. Then, the successfully matched fiber bending degree and length are re-matched using time difference data to further filter out fiber bending degrees and lengths that simultaneously satisfy both period difference signals and time difference data. This determines the propagation of the test signal in the fiber under test, ensuring that the state of the selected fiber is realistically effective for the propagation of the test signal. This improves the accuracy of the optical fiber model in simulating optical signal propagation and enhances the accuracy of fault point test results in optical fiber communication testing. Attached Figure Description

[0043] Figure 1 This is a flowchart of the steps of the optical fiber communication testing method in this embodiment. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1This application will be described in further detail.

[0045] This application discloses a fiber optic communication testing method.

[0046] Example: Figure 1 As shown, the present invention provides a fiber optic communication testing method, comprising:

[0047] S1. Input test data into the optical fiber under test to obtain received data. Compare the received data with the test data to determine the integrity of the received data. If the received data is incomplete, it is determined that there is a fault in the optical fiber under test, and the fault is located. Specifically, when judging the integrity of the received data, S11. Compare the received data with the test data to determine whether there are any missing data and obtain the missing percentage. S12. Compare the missing percentage with the built-in data loss rate. If the missing percentage is greater than the built-in data loss rate, compare the signal strength of the received data with the test data to determine the signal attenuation data, and compare the signal attenuation data with the built-in signal attenuation rate. S13. If the signal attenuation data is greater than the built-in signal attenuation rate, it is determined that the optical fiber under test is incomplete.

[0048] S2, after determining that there is a fault point in the optical fiber under test, the corresponding test signal is input into the optical fiber under test based on the test set to obtain the feedback signal at the receiving end; the feedback signal includes the propagation time, signal strength and propagation period; where the test signal in the test set refers to the optical signal that is incident on the optical fiber under test at different incident angles.

[0049] S3. Obtain the physical information of the optical fiber under test, and based on the physical information and the test signals in the test set, determine the theoretical propagation time of the test signal. Compare the theoretical propagation time of the test signal with the propagation time of the corresponding feedback signal to determine whether there is a case in the feedback signal where the propagation time is less than the theoretical propagation time. The physical information includes the length and diameter of the optical fiber.

[0050] S4. If there is a case in the feedback signal where the propagation time is less than the theoretical propagation time, then the corresponding test signal and feedback signal are marked to obtain the test mark signal and the feedback mark signal; if there is no case in the feedback signal where the propagation time is less than the theoretical propagation time, then the feedback signal and its corresponding test signal are not marked.

[0051] S5. Based on the unlabeled feedback signal and test signal, the morphology of the optical fiber under test is determined to obtain the morphological data of the optical fiber, and an optical fiber model is constructed based on the morphological data.

[0052] S6. Simulate the test marker signal according to the optical fiber model to obtain the feedback simulation signal, and compare the feedback simulation signal with the feedback marker signal to determine the location information of the fault point;

[0053] S7. If the propagation time in the feedback signal is greater than the theoretical propagation time, the test signal is divided based on the built-in group to construct the fiber optic model under the corresponding group. The test signal and its feedback signal are filtered based on the fiber optic model under the corresponding group to obtain special items. The special items are simulated and analyzed to obtain the location information of the fault point of the fiber under test.

[0054] In this embodiment, during communication testing of optical fibers, the integrity of the received data is assessed to determine if a fault exists in the fiber. A test set is then used to input a test signal into the fiber under test and the output signal is collected. The theoretical propagation time of the test signal is determined based on the physical information of the fiber under test. The actual propagation time is compared with the theoretical propagation time to achieve the first screening of the feedback signal, identifying feedback signals whose propagation path passes through the fault point. For feedback signals that can be obtained through propagation time assessment, a fiber model is established using the correct feedback signal. The fiber model is then compared with the marked test signal to determine the location of the fault point. When the propagation time cannot filter out the required feedback signal, the data characteristics of the feedback signal are analyzed to identify special items that pass through the fault point, thereby determining the location of the corresponding fault point. This improves the convenience and accuracy of fault location determination and reduces the testing cost of optical fiber communication testing.

[0055] For example, when an optical fiber in use experiences incomplete data reception, it is determined that there is a fault in the optical fiber, causing data loss during optical signal transmission. Therefore, in order to ensure the continuous usability of the optical fiber, it is necessary to locate the fault and repair it accordingly to ensure the normal use of the optical fiber.

[0056] When diagnosing a fault, a specific optical signal is output to the optical fiber under test, and the output signal after transmission through the fiber is collected to obtain a feedback signal. When the optical signal is not reflected in the fiber, its propagation length is the same as the fiber length. Therefore, the theoretical time required for the optical signal to propagate through the fiber under test can be directly calculated using the light propagation formula. When the optical signal is reflected in the fiber, its propagation length is greater than the fiber length. Therefore, the actual time required for the optical signal to propagate through the fiber under test is greater than the theoretical time. Based on this propagation time, the test signals in the test set can be initially assessed to quickly identify cases where a fault point causes the propagation time to be less than the theoretical propagation time, thus quickly confirming the test signal triggered by the fault point.

[0057] Because optical fibers are not perfectly straight, optical signals propagate via total internal reflection. Therefore, some reflection paths may include a fault point, while others may not. Further analysis is needed to determine which optical signal passes through the fault point. For example, the reflection path of an optical signal in an optical fiber may follow a sine curve. Suppose that when When the optical signal is reflected at one edge, and the fault point is located at the other edge directly opposite the reflection point, the optical signal in this state does not pass through the fault point. Therefore, the transmission of the optical signal is not affected by the fault point, that is, the feedback signal is a normal signal. Thus, the internal state of the optical fiber can be evaluated based on the feedback of the normal feedback signal in the optical fiber, thereby simulating the optical fiber model under normal conditions. Then, the test signal of the marker can be specifically analyzed based on the simulated optical fiber model under normal conditions to determine the location information of the fault point in the entire propagation path of the test marker signal.

[0058] Similarly, when the propagation time of all feedback signals is greater than the theoretical propagation time, since the test signals in the test set cover the corresponding detection range, the impact of the fault point on the test signal cannot reduce the propagation time. Therefore, the feedback signal contains the signal after the fault point has acted upon it. Furthermore, since the fault point affects the feedback signal, while the feedback signal that does not pass through the fault point is unaffected, big data analysis of the feedback signal can be performed to identify special items, and by analyzing these special items, the corresponding fault point can be determined.

[0059] In step S3, the physical information of the optical fiber under test is obtained, and based on the physical information and the test signals in the test set, the theoretical propagation time of the test signal is determined. The theoretical propagation time of the test signal is compared with the propagation time of the corresponding feedback signal to determine whether there is a case in the feedback signal where the propagation time is less than the theoretical propagation time. This includes the following steps:

[0060] S31. Based on the test signal, determine the propagation period of the corresponding test signal, and based on the propagation period and the three-dimensional data of the physical information in the optical fiber under test, determine the time required for the optical signal to propagate in the optical fiber under test with the corresponding propagation period, and obtain the theoretical propagation time.

[0061] S32, compare the theoretical propagation time with the propagation time of the corresponding feedback signal of the test signal to determine whether there is a case in the test signal where the theoretical propagation time is greater than the propagation time of the corresponding feedback signal.

[0062] For example, since the propagation periods of each test signal in the test set are different, when judging the theoretical propagation time, the reflection path of the optical signal when it is reflected in the optical fiber is calculated based on the propagation period and the three-dimensional data (length and diameter) of the optical fiber. The propagation length of the optical signal is determined by calculating the reflection path, and then the corresponding theoretical propagation time is calculated by using the speed of light.

[0063] For example, if the optical fiber under test is of length *a* and diameter *2b*, and the test signal enters the fiber at a 60° angle, then the total propagation path of the test signal is *2a*. Since the speed of light is *c*, the propagation time is... The feedback signal contains the propagation time of the corresponding test signal. By comparing these values, the theoretical and practical relationship can be determined.

[0064] In step S5, the morphology of the fiber under test is determined based on the unlabeled feedback signal and the test signal to obtain the morphological data of the fiber. A fiber model is then constructed based on the morphological data, including the following steps:

[0065] S51, based on the length data in the physical information of the unlabeled test signal and the optical fiber, simulate the propagation path of the test signal in the optical fiber to obtain the test propagation path;

[0066] S52, based on the length data in the unlabeled feedback signal and the unlabeled information of the optical fiber, simulate the propagation path of the feedback signal in the optical fiber to obtain the feedback propagation path;

[0067] S53, based on the theoretical propagation time and the actual propagation duration, compare the test propagation path and the feedback propagation path of the corresponding test signal and feedback signal in the test set to construct the propagation status of the test signal and feedback signal in the propagation process;

[0068] S54, based on big data, statistically judges the propagation of each test signal and its corresponding feedback signal in the test set during the propagation process, determines the propagation of the optical signal in each region of the optical fiber under test, obtains the morphological data of the optical fiber under test, and constructs the corresponding optical fiber model based on the morphological data, so that the corresponding feedback signal can be simulated according to the test signal.

[0069] In this embodiment, the propagation path of the corresponding signal in a normal optical fiber is determined by using unlabeled test signals and their corresponding feedback signals. Then, based on the theoretical propagation time and the actual propagation duration, the propagation process of the optical signal transforming from a test signal to a feedback signal is determined. By statistically judging the propagation process of a large number of test signals and their feedback signals, the propagation status of the optical signal in various regions of the optical fiber under test is determined. This allows the optical fiber model constructed based on the propagation status to more accurately reflect the shape of the real optical fiber model, improving the accuracy of fault location judgment based on the optical fiber model. At the same time, the constructed optical fiber model transforms the microscopic material properties of the optical fiber into macroscopic changes, improving the accuracy of the optical fiber model and further improving the accuracy of fault location judgment.

[0070] For example, since the unmarked test signal is an optical signal that is not affected by the fault point, when the unmarked test signal is different from its corresponding feedback signal, it may be due to the change in transmission time and angle caused by the bending of the optical fiber. Therefore, the two are grouped together, and the transmission path of the grouped data is determined to determine the propagation path of the unmarked test signal and its unmarked feedback signal in the optical fiber. Then, due to the difference between the theoretical propagation time and the actual propagation time, the path of the optical signal propagating in the form of a test signal and the path of the propagation in the form of a feedback signal, as well as the path of the conversion process between the two signal forms, are determined during the propagation process.

[0071] Due to the differences between signal transmission and test signals, various results may occur. However, since all test signals in the test set are transmitted in the same type of optical fiber, by statistically judging a large number of test signals, a unique optical fiber configuration can be obtained that can simultaneously satisfy the transformation process from a large number of unlabeled test signals to feedback signals. Using this optical fiber configuration, a corresponding optical fiber model can be constructed to transform the microscopic changes in the optical fiber into macroscopic changes.

[0072] In step S53, based on the theoretical propagation time and the actual propagation duration, the test propagation paths and feedback propagation paths of the corresponding test signals and feedback signals in the test set are compared to construct the propagation status of the test signals and feedback signals during the propagation process, including the following steps:

[0073] S531, calculate the propagation period difference between the test signal and the feedback signal to obtain the period difference signal;

[0074] S532, based on the material properties in the physical information of the optical fiber under test, determines the bending range of the optical fiber under test, and matches the bending range based on the period difference signal to determine the bending that the optical fiber under test can meet and the propagation distance under the corresponding bending, thus obtaining the reflection variation range; where the reflection variation range refers to the bending range and propagation distance range that can transform the optical signal from the test signal form to the feedback signal form for propagation.

[0075] S533: Calculate the time difference between the theoretical propagation time and the actual propagation time. Based on the time difference data, filter the reflection variation range to obtain the fiber optic signal propagation situation that simultaneously satisfies the period difference signal and the time difference data. The fiber optic signal propagation situation includes the test signal path, the bending path, and the feedback signal path, and these three paths are used as the propagation situations of the corresponding test signal and feedback signal during the propagation process. The test signal path refers to the distance propagated in the form of the test signal, the feedback signal path refers to the distance propagated in the form of the feedback signal, and the bending path includes the curvature and the distance propagated from the test signal form to the feedback signal form at the corresponding curvature.

[0076] In this embodiment, the bending characteristics of the optical fiber material itself are utilized to determine the maximum bending that the bending path can achieve. By matching the bending degree with the period difference signal, the bending degree and length of the optical fiber that can convert the propagation period of the test signal into the propagation period of the feedback signal are determined. Then, the successfully matched bending degree and length of the optical fiber are rematched using time difference data, thereby further filtering out the bending degree and length of the optical fiber that simultaneously satisfies the period difference signal and time difference data. This determines the propagation of the test signal in the optical fiber under test, ensuring that the state of the filtered optical fiber is realistic and effective for the propagation of the test signal. This improves the accuracy of the optical fiber model in simulating optical signal propagation and enhances the accuracy of fault point test results in optical fiber communication testing.

[0077] For example, when determining the propagation of an optical signal in an optical fiber based on a test signal and a corresponding feedback signal, it is first determined whether there is a difference in the propagation period between the input test signal and the output feedback signal. Then, it is determined whether there is a time difference between the theoretical propagation time and the actual propagation time. Finally, the shape of the optical fiber is matched within the determined maximum bending degree of the optical fiber.

[0078] Because the propagation time of an optical signal increases when the optical fiber bends, it is necessary to determine the range corresponding to the degree of fiber bending using a period difference signal. For example, a test signal with a reflection angle of 60° is converted into a feedback signal with a reflection angle of 30°. Suppose that if the fiber bending angle is 1°, a 20m long fiber is required, but the actual fiber length is 10m, making it infeasible. If the fiber bending angle is 2°, a 10m fiber is required, and the actual fiber length meets the requirement. Then, time matching is performed to calculate whether the time required for the optical signal to propagate in a 2° bending fiber is the same as that of the feedback signal. If they are the same, it is considered feasible; otherwise, it is considered infeasible. If the fiber bending angle is 3°, a 5m fiber is required, and the actual fiber length meets the requirement. Then, time matching is performed again to determine whether the extra time required for the test signal to propagate in a 5m long fiber with a 3° bending angle is the same as the time difference data. If they are the same, it is considered feasible; otherwise, it is considered infeasible.

[0079] In step S6, the test marker signal is simulated based on the fiber optic model to obtain a feedback simulated signal. The feedback simulated signal is then compared with the feedback marker signal to determine the location information of the fault point. This includes the following steps:

[0080] S61, based on the optical fiber model, the test mark signal is simulated to obtain the feedback simulation signal output when the test mark signal propagates in the optical fiber under test;

[0081] S62, based on the fiber optic model, reverse simulation of the feedback marker signal is performed to obtain the feedback marker path data;

[0082] S63, compare the analog path data in the feedback analog signal with the feedback marker path data to determine the common reflection point between the analog path data and the feedback marker path data;

[0083] S64, input the remaining test signals in the test set into the fiber optic model to obtain the comparison simulation signal corresponding to the test signal;

[0084] S65, match the analog path data of each comparison analog signal with the common reflection point, determine the reflection point not included in the comparison analog signal, and record the location information corresponding to the non-included reflection point as the location information of the fault point.

[0085] In this embodiment, the propagation path of the test marker signal under normal optical fiber is determined by simulating the test marker signal using an optical fiber model. Then, the propagation path of the feedback marker signal under normal optical fiber is determined by simulating the feedback marker signal. Since the test marker signal is transformed into the feedback marker signal under the action of the fault point, the common reflection point between the simulated path data and the feedback marker path data is determined by comparing the two propagation paths. The common reflection point is then investigated using the remaining test signals in the test set, which improves the accuracy of fault point identification.

[0086] For example, since the test signals in the test set are accurate, the propagation path of the test signal on a normal optical fiber is determined by inputting the test signal into the optical fiber model for simulation. However, since there is a fault point on the optical fiber under test, the state of the test signal during propagation should be test signal form → fault point (form changes) → feedback marker signal form. Therefore, the propagation form of the test signal is initial before it reaches the fault point. When it touches the fault point, the form of the test signal changes and becomes a feedback marker signal. Therefore, the intersection of the test signal and the feedback marker signal during propagation is the location of the fault point. Furthermore, if there is a reflection point on the simulated path data in the feedback simulation signal that corresponds to the feedback marker path, then this common reflection point may be the fault point. Therefore, by using other test signals in the test set to check for common reflection points, a unique reflection point can be obtained, thereby determining the location of the fault point.

[0087] In step S7, if the propagation time in the feedback signal is greater than the theoretical propagation time, the test signal is divided based on the built-in groups to construct the fiber optic model under the corresponding group. Based on the fiber optic model under the corresponding group, the test signal and its feedback signal are filtered to obtain special items. The special items are simulated and analyzed to obtain the location information of the fault point of the fiber under test, including the following steps:

[0088] S71, based on the built-in groups, groups the test signals and their corresponding feedback signals in the test set to obtain corresponding test signal groups and feedback signal groups; among them, the built-in groups can be used to obtain effective grouping rules through experiments, and the grouped data obtained according to the effective grouping rules are also effective, and the constructed optical fiber model is also effective.

[0089] S72. Based on the propagation duration, signal strength, and signal propagation period of the signals in the test signal group and the feedback signal group, fiber optic models of the corresponding groups are constructed to obtain fiber optic model groups.

[0090] S73, based on the built-in groups, compares the fiber model groups of different groups to determine the fiber model with the largest proportion, and uses this fiber model as the fiber model of the fiber under test. The fiber model with the largest proportion is marked as the true fiber model, and the test signal group and feedback signal group corresponding to the other fiber models are marked as fake model group data.

[0091] S74, Based on the true fiber optic model, verify the data of the fake model group to determine the special items in the fake model group data; that is, input the test signal in the fake model group data into the true fiber optic model to obtain the corresponding true analog signal, and compare the true analog signal with the corresponding feedback signal. If they are different, the test signal and its corresponding feedback signal are determined to be special items.

[0092] S75, based on special terms, inputs the test signal and feedback signal of the special terms into the true optical fiber model to obtain the corresponding true analog signal and true feedback analog signal, and compares the propagation path of the true analog signal with the propagation path of the true feedback analog signal to obtain the common reflection point;

[0093] S76, based on the propagation time of the feedback signal of the special item, the common reflection point is verified to determine the fault point of the fiber under test and obtain the location information of the fault point.

[0094] In this embodiment, a large number of test signals are grouped to ensure that the test signals and feedback signals in each group can effectively construct the corresponding optical fiber model. By comparing the optical fiber models of different groups, the optical fiber model with the highest reliability among multiple optical fiber models is determined. This optical fiber model is then used as the optical fiber model for judging special items. By simulating the optical fiber model on the test signals and feedback signals of the other groups, special items are verified, making the judgment of special items accurate. Furthermore, by using the propagation time to filter the common reflection points of special items, the fault point of the optical fiber under test is determined, and the location information of the fault point is obtained, making the judgment result of the fault point location information more accurate.

[0095] For example, the test signals in the test set are grouped by built-in groups, such as into four groups. There are four groups of test signals and four corresponding feedback signals. Fiber optic models are constructed for each group's test signals and feedback signals, resulting in four fiber optic models. Since one of the four groups' feedback signals contains an error signal caused by a fault point, at least one of the four fiber optic models is different from the other three. These four fiber optic models are numbered to obtain groups A, B, C, and D. Assuming that the fiber optic models of A, B, and C are the same, while D is different from A, B, and C, it can be determined that the fiber optic models corresponding to A, B, and C are fiber optic models that can truly reflect the fiber optic shape. The signal formed by the fault point is in the group corresponding to fiber optic model D. By using the test signals in this group to verify the feedback signal, the special items in the group corresponding to fiber optic model D can be effectively determined, and the location information of the fault point can be determined based on the special items.

[0096] In step S76, the common reflection point is verified based on the propagation time of the feedback signal of the special item to determine the fault point of the optical fiber under test and obtain the location information of the fault point, including the following steps:

[0097] S761, based on a common reflection point, selects a common reflection point as the fault point, and performs signal transmission simulation on the fault point according to the true optical fiber model to determine the propagation time required for the test signal of the special item to pass through the fault point during transmission, and obtains the simulated propagation time.

[0098] S762, compare the simulated propagation time with the propagation time of the feedback signal of the special item. If the simulated propagation time is the same as the propagation time of the feedback signal of the special item, then determine that the selected common reflection point is the fault point and obtain the location information of the fault point.

[0099] S763, if the simulated propagation time is different from the propagation time of the feedback signal of the special item, it is determined that the selected common reflection point is not a fault point, and the common reflection point is reselected until the simulated propagation time corresponding to the selected common reflection point is the same as the propagation time of the feedback signal of the special item.

[0100] For example, assuming there are common reflection points a, b, and c, we first select common reflection point a as the fault point. Then, the propagation period before the fault point is the propagation period of the test signal, and the propagation period after the fault point is the propagation period of the feedback signal. We can then calculate the propagation time requirements on the two paths. When the total propagation time is the same as the propagation time in the feedback signal of the corresponding special item, it indicates that the common reflection point is the fault point, which ensures the accuracy of fault point selection and thus improves the accuracy of test results.

[0101] Compared with existing optical fiber communication testing methods, this invention improves the accuracy of test results.

[0102] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for testing optical fiber communication, characterized in that, include: Step S1: Input test data into the optical fiber under test to obtain received data, compare the received data with the test data to determine the integrity of the received data; If the received data is incomplete, it is determined that there is a fault in the fiber optic cable under test, and the fault is located. Step S2: After determining that there is a fault point in the optical fiber under test, the corresponding test signal is input into the optical fiber under test based on the test set to obtain the feedback signal from the receiving end. Step S3: Obtain the physical information of the optical fiber under test, and based on the physical information and the test signals in the test set, determine the theoretical propagation time of the test signal. Compare the theoretical propagation time of the test signal with the propagation time of the corresponding feedback signal to determine whether there is a case in the feedback signal where the propagation time is less than the theoretical propagation time. Step S4: If there is a case in the feedback signal where the propagation time is less than the theoretical propagation time, then mark the corresponding test signal and feedback signal to obtain the test mark signal and the feedback mark signal. Step S5: Based on the unlabeled feedback signal and test signal, the morphology of the optical fiber under test is determined to obtain the morphological data of the optical fiber, and an optical fiber model is constructed based on the morphological data. Step S6: Simulate the test marker signal according to the optical fiber model to obtain the feedback simulated signal, and compare the feedback simulated signal with the feedback marker signal to determine the location information of the fault point; Step S7: If the propagation time in the feedback signal is greater than the theoretical propagation time, the test signal is divided based on the built-in group to construct the optical fiber model under the corresponding group. The test signal and its feedback signal are filtered based on the optical fiber model under the corresponding group to obtain special items. The special items are simulated and analyzed to obtain the location information of the fault point of the optical fiber under test.

2. The optical fiber communication testing method according to claim 1, characterized in that: The test signals in the test set refer to optical signals that are incident on the optical fiber under test at different incident angles.

3. The optical fiber communication testing method according to claim 1, characterized in that: Step S3 includes: Based on the test signal, the propagation period of the corresponding test signal is determined, and based on the propagation period and the three-dimensional data of the physical information in the optical fiber under test, the time required for the optical signal to propagate in the optical fiber under test with the corresponding propagation period is determined, and the theoretical propagation time is obtained. The theoretical propagation time is compared with the propagation time of the corresponding feedback signal to determine whether there is a case in the test signal where the theoretical propagation time is greater than the propagation time of the corresponding feedback signal.

4. The optical fiber communication testing method according to claim 1, characterized in that: Step S5 includes: Step S51: Based on the length data in the physical information of the unlabeled test signal and the optical fiber, simulate the propagation path of the test signal in the optical fiber to obtain the test propagation path; Step S52: Based on the length data in the unlabeled feedback signal and the unlabeled information of the optical fiber, simulate the propagation path of the feedback signal in the optical fiber to obtain the feedback propagation path; Step S53: Based on the theoretical propagation time and the actual propagation duration, compare the test propagation path and feedback propagation path of the corresponding test signal and feedback signal in the test set to construct the propagation status of the test signal and feedback signal during the propagation process. Step S54: Based on big data, statistically judge the propagation of each test signal and its corresponding feedback signal in the test set during the propagation process, determine the propagation of the optical signal in each region of the optical fiber under test, obtain the morphological data of the optical fiber under test, and construct the corresponding optical fiber model based on the morphological data, so that the corresponding feedback signal can be simulated according to the test signal.

5. The optical fiber communication testing method according to claim 4, characterized in that: Step S53 includes: The propagation period difference between the test signal and the feedback signal is calculated to obtain the period difference signal. Based on the material properties in the physical information of the optical fiber under test, the bending range of the optical fiber under test is determined, and the bending range is matched based on the period difference signal to determine the bending range that the optical fiber under test can meet and the propagation distance under the corresponding bending range, thus obtaining the reflection variation range. The time difference data between the theoretical propagation time and the actual propagation time is calculated, and the reflection variation range is filtered based on the time difference data to obtain the optical fiber signal propagation situation that simultaneously satisfies the period difference signal and the time difference data. The optical fiber signal propagation situation includes the test signal path, the bending path and the feedback signal path, and the test signal path, the bending path and the feedback signal path are used as the propagation situation of the corresponding test signal and feedback signal during the propagation process.

6. The optical fiber communication testing method according to claim 1, characterized in that: Step S6 includes: The test marker signal is simulated based on the optical fiber model to obtain the feedback simulation signal output when the test marker signal propagates in the optical fiber under test; The feedback marker signal is simulated inversely based on the fiber optic model to obtain the feedback marker path data; The analog path data in the feedback analog signal is compared with the feedback marker path data to determine the common reflection point between the analog path data and the feedback marker path data; The remaining test signals in the test set are input into the fiber optic model to obtain the comparison simulation signals corresponding to the test signals; The simulated path data of each comparison simulation signal is matched with the common reflection point to determine the reflection point not included in the comparison simulation signal, and the location information corresponding to the non-included reflection point is recorded as the location information of the fault point.

7. The optical fiber communication testing method according to claim 1, characterized in that: Step S7 includes: Step S71: Group the test signals and their corresponding feedback signals in the test set according to the built-in groups to obtain the corresponding test signal groups and feedback signal groups; Step S72: Based on the propagation duration, signal strength, and signal propagation period of the signals in the test signal group and the feedback signal group, construct the corresponding fiber optic model group to obtain the fiber optic model group. Step S73: Based on the built-in groups, compare the fiber model groups of different groups to determine the fiber model with the largest proportion and use it as the fiber model of the fiber to be tested. Mark the fiber model with the largest proportion as the true fiber model and mark the test signal group and feedback signal group corresponding to the other fiber models as the fake model group data. Step S74: Verify the fake model group data based on the real fiber optic model to determine the special items in the fake model group data; Step S75: Based on the special item, input the test signal and feedback signal of the special item into the true optical fiber model to obtain the corresponding true analog signal and true feedback analog signal, and compare the propagation path of the true analog signal with the propagation path of the true feedback analog signal to obtain the common reflection point. Step S76: Verify the common reflection point based on the propagation time of the feedback signal of the special item, determine the fault point of the optical fiber under test, and obtain the location information of the fault point.

8. The optical fiber communication testing method according to claim 7, characterized in that: Step S76 includes: Based on the common reflection point, a common reflection point is selected as the fault point, and the signal transmission of the fault point is simulated according to the true optical fiber model. The propagation time required for the test signal of the special item to pass through the fault point during transmission is determined, and the simulated propagation time is obtained. The simulated propagation time is compared with the propagation time of the feedback signal of the special item. If the simulated propagation time is the same as the propagation time of the feedback signal of the special item, the selected common reflection point is determined to be the fault point, and the location information of the fault point is obtained. If the simulated propagation time is different from the propagation time of the feedback signal of the special item, the selected common reflection point is determined not to be a fault point. The common reflection point is then reselected until the simulated propagation time corresponding to the selected common reflection point is the same as the propagation time of the feedback signal of the special item.

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