Polarization-maintaining optical fiber loss test device, system, method and storage medium

Abstract

The present application relates to a polarization-maintaining optical fiber loss test device, system, method and storage medium. The polarization-maintaining optical fiber loss test device includes: a measurement module; the measurement module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested of the all-optical fiber current transformer located in the control room; the measurement module is used to output an optical signal to the polarization-maintaining optical fiber to be tested; a return light module; the return light module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested, and returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path; the measurement module is also used to receive the returned optical signal output by the polarization-maintaining optical fiber to be tested, and measure the optical power of the returned optical signal; the optical power is used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested. The present application has a simple structure, low cost, high measurement efficiency and high measurement reliability, and provides a convenient and efficient detection means for the inspection and maintenance of the polarization-maintaining optical fiber of the all-optical fiber current transformer in the converter station.

Description

Technical Field

[0001] The present application relates to the field of optical fiber detection technology, and in particular to a polarization-maintaining optical fiber loss test device, system, method and storage medium. Background Art

[0002] The domestically produced all-fiber current transformer based on optical sensing technology, hereinafter referred to as optical CT (Current Transformer), adopts the long-distance polarization-maintaining optical cable technology solution, integrates polarization devices such as polarizers, modulators and delay loops in the secondary acquisition unit, and places it in the integrated control room cabinet. The transmission between the primary body and the cabinet side is pure polarization-maintaining optical fiber, which improves the overall anti-electromagnetic interference capability of the optical CT, and the electronic unit is easy to maintain (no power outage on the primary side). The polarizer, phase modulator and delay loop are integrated in the acquisition unit, and a modular plug-in design is adopted. The acquisition unit and the primary sensor are connected by polarization-maintaining optical fiber, and the modulation loop signal line is also routed inside the acquisition unit. The primary body of the optical CT is located on the outdoor high-voltage side, used to measure the primary current and return sensitive parameters. The acquisition unit is located in the indoor control room, used to collect the returned sensitive parameters and demodulate and output digital quantities proportional to the primary current. The primary body and the acquisition unit are connected by a polarization-maintaining optical cable to complete the long-distance round-trip transmission of optical signals.

[0003] At present, the polarization-maintaining optical cable used in the field of optical CT is an armored multi-core structure, that is, an optical cable with multiple polarization-maintaining optical fibers embedded. Generally, the main polarization-maintaining optical fiber for transmitting signals accounts for 50% of the total optical fiber bundle, and the remaining polarization-maintaining optical fiber is used as a backup optical fiber to replace the main optical fiber that fails. When used on site, the two ends of the main polarization-maintaining optical fiber are connected to the main body and the acquisition unit through optical fiber fusion splicing. The two ends of the backup optical fiber are bare fibers with no physical connection and are suspended. At present, there is no corresponding detection means in the converter station of the DC transmission system, and there is no condition for detecting the backup core, and it is impossible to ensure the availability of the backup core. Once a problem occurs with the main optical fiber, replacing the backup optical fiber in an unknown state will increase the difficulty of fault elimination and the time of fault handling. There are generally two ways to measure the loss of optical fiber. The first one uses the two-end measurement method, that is, a light source is used to send out an optical signal at one end, and an optical power tester or optical power meter is used at the other end to receive the optical signal and output the optical power; the second one uses the more advanced instrument OTDR (Optical Time-Domain Reflectometer), which can realize single-end optical fiber measurement and has powerful functions. It can draw the loss curve of the entire optical fiber and locate the fault point. However, the first test system is relatively simple. It is efficient for shorter optical fibers and the measurement accuracy also meets the use requirements. However, for long-distance optical fiber cables, this technical solution is inefficient and time-consuming to measure one by one, and the distance between the two ends is too far, requiring people to work at both ends at all times and requiring communication tools. However, one end of the optical CT polarization-maintaining optical fiber is in a high-voltage field, with a strong electromagnetic interference signal that affects the accuracy and reliability of the light source or optical power meter, and the other end is in the control room. The communication signal is shielded in the control room and communication cannot be carried out, affecting the measurement. The second method uses OTDR to test the transmission loss of polarization-maintaining optical fiber. OTDR is generally used for more professional fiber optic diagnosis. This instrument is usually an imported product with high cost and difficult maintenance. When using it, it is necessary to connect at least one hundred meters of optical fiber to eliminate the test blind area. There are also problems in connecting the external optical fiber with the optical fiber to be tested. It is relatively simple to test communication optical fiber with connectors, but it is more difficult for polarization-maintaining optical fiber with bare fibers at both ends.

[0004] During the implementation process, the inventors found that there are at least the following problems in the conventional technology: the measurement of the existing optical fiber loss test device is unreliable and the detection efficiency is low. Summary of the invention

[0005] Based on this, it is necessary to provide a polarization-maintaining optical fiber loss test device, system, method and storage medium to address the above technical problems.

[0006] A polarization-maintaining optical fiber loss test device, comprising:

[0007] Measuring module; the measuring module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured of the all-fiber current transformer located in the control room; the measuring module is used to output an optical signal to the polarization-maintaining optical fiber to be measured;

[0008] The return light module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested on the high-voltage side; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested, and returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path;

[0009] The measuring module is also used to receive the returned optical signal outputted by the polarization-maintaining optical fiber to be tested, and to measure the optical power of the returned optical signal; the optical power is used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested.

[0010] In one of the embodiments, it further includes a first optical fiber adapter module and a second optical fiber adapter module;

[0011] The first optical fiber adapter module is connected to the measurement module and is also used to connect to the bare fiber port in the polarization-maintaining optical fiber control room to be measured;

[0012] The second optical fiber adapter module is used to connect to the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side;

[0013] The measuring module inputs the optical signal into the polarization-maintaining optical fiber to be tested through the first optical fiber adapter module; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested through the second optical fiber adapter module, and returns the optical signal to the second optical fiber adapter module along the original optical path; the second optical fiber adapter module inputs the returned optical signal into the polarization-maintaining optical fiber to be tested; and the testing module receives the returned optical signal through the first optical fiber adapter module.

[0014] In one of the embodiments, the test module includes: a light source unit, a light splitting unit, an optical power detection unit, and a first optical fiber interface;

[0015] The input end of the light splitting unit is connected to the light source unit; the output end of the light splitting unit is connected to the optical power detection unit; the input and output ends of the light splitting unit are connected to the first optical fiber interface; the first optical fiber interface is connected to the first optical fiber adapter module;

[0016] The light source unit is used to emit a light signal and input the light signal into the light splitting unit;

[0017] The optical splitter unit is used to input the optical signal into the polarization-maintaining optical fiber to be tested through the first optical fiber interface, receive the returned optical signal through the first optical fiber interface, and input the returned optical signal into the optical power detection unit;

[0018] The optical power detection unit is used to receive the returned optical signal and measure the optical power of the returned optical signal.

[0019] In one of the embodiments, the light return module includes a fiber coupler and a second fiber interface;

[0020] The optical fiber tail end of the first end of the optical fiber coupler and the optical fiber tail end of the second end of the optical fiber coupler are fused together to form a ring optical path; the third end of the optical fiber coupler is connected to the second optical fiber interface;

[0021] The second optical fiber interface is used to connect the polarization-maintaining optical fiber to be tested.

[0022] In one embodiment, the first optical fiber adapter module includes a first ceramic ferrule and a first clamping unit; the bottom of the first ceramic ferrule is arranged on the top of the first clamping unit;

[0023] The first clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber, and to allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber to pass through the bottom of the first clamping unit into the first ceramic ferrule;

[0024] The first ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room with the measurement module.

[0025] In one embodiment, the second optical fiber adapter module includes a second ceramic ferrule and a second clamping unit; the bottom of the second ceramic ferrule is arranged on the top of the second clamping unit;

[0026] The second clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located on the high-voltage side, and allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located on the high-voltage side to pass through the second ceramic ferrule from the bottom of the second clamping unit;

[0027] The second ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side with the return light module.

[0028] In one embodiment, the light return module is a multi-channel light return module; the multi-channel light return module is obtained by integrating multiple single-channel light return modules.

[0029] A polarization-maintaining optical fiber loss test system, comprising: an all-optical fiber current transformer and the above-mentioned polarization-maintaining optical fiber loss test device;

[0030] The polarization-maintaining optical fiber loss test device is connected to the polarization-maintaining optical fiber to be tested of the all-optical current transformer; one end of the polarization-maintaining optical fiber to be tested is located in the control room, and the other end is located at the high-voltage side.

[0031] A testing method for the above-mentioned polarization-maintaining optical fiber loss testing device comprises:

[0032] Obtain the optical power of the standard polarization-maintaining fiber and the optical power of the polarization-maintaining fiber to be tested; the optical power of the standard polarization-maintaining fiber is measured by connecting the bare fiber at one end of the standard polarization-maintaining fiber to the measurement module, and connecting the bare fiber at the other end of the standard polarization-maintaining fiber to the return light module; the optical power of the polarization-maintaining fiber to be tested is measured by connecting the bare fiber port of the polarization-maintaining fiber to be tested located in the control room to the measurement module, and connecting the bare fiber port of the polarization-maintaining fiber to be tested located on the high-voltage side to the return light module;

[0033] Based on the following model, the optical power of the standard polarization-maintaining fiber and the optical power of the polarization-maintaining fiber to be tested are processed to obtain the optical fiber loss of the polarization-maintaining fiber to be tested:

[0034]

[0035] Among them, K α is the optical fiber loss of the polarization-maintaining optical fiber to be tested; P n is the optical power of the polarization-maintaining fiber to be tested; P0 is the optical power of the standard polarization-maintaining fiber; L is the length of the polarization-maintaining fiber to be tested.

[0036] A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

[0037] One of the above technical solutions has at least the following advantages and beneficial effects:

[0038] The present application outputs an optical signal to the bare fiber port of the polarization-maintaining optical fiber to be tested of the all-optical current transformer located in the control room through a test module, and the optical signal is transmitted to the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side through the optical fiber to be tested; a return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested, and returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path; a measurement module receives the returned optical signal output by the polarization-maintaining optical fiber to be tested, and measures the optical power of the returned optical signal, and the optical power can be used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested. The present application has a simple structure and low cost, and can measure the loss of the main optical fiber and spare optical fiber in the polarization-maintaining optical cable of the all-optical current transformer laid in the cable trench, thereby evaluating the optical fiber quality and realizing the detection of the spare core of the in-service all-optical current transformer. It can also detect the spare polarization-maintaining optical cable to ensure the availability of spare parts, providing a convenient and efficient detection means for the inspection and maintenance of the polarization-maintaining optical fiber of the all-optical current transformer in the converter station; the present application can solve the technical defects of unreliable measurement, low detection efficiency and high detection cost caused by high-voltage electromagnetic interference in the existing technical solutions, so as to meet the new requirements of the smart grid for improving the reliability and stability of the all-optical current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a structural block diagram of a polarization-maintaining optical fiber loss test device in one embodiment;

[0041] Figure 2 It is a structural schematic diagram of a polarization-maintaining optical fiber loss testing device in another embodiment;

[0042] Figure 3 is a schematic structural diagram of a first optical fiber adapter module or a second optical fiber adapter module in an embodiment;

[0043] Figure 4 is a structural block diagram of a test module in an embodiment;

[0044] Figure 5 is a structural block diagram of a light return module in an embodiment;

[0045] Figure 6 FIG. 4 is a structural block diagram of a polarization-maintaining optical fiber loss test system in one embodiment. DETAILED DESCRIPTION

[0046] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0049] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0050] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0051] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0052] In one embodiment, Figure 1 As shown, a polarization-maintaining optical fiber loss test device is provided, which may include:

[0053] Measuring module; the measuring module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured of the all-fiber current transformer located in the control room; the measuring module is used to output an optical signal to the polarization-maintaining optical fiber to be measured;

[0054] The return light module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested on the high-voltage side; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested, and returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path;

[0055] The measuring module is also used to receive the returned optical signal outputted by the polarization-maintaining optical fiber to be tested, and to measure the optical power of the returned optical signal; the optical power is used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested.

[0056] Among them, the measurement module is both the transmitting end and the receiving end of the optical signal, that is, it provides the optical signal required for the optical fiber loss test device to measure, and also measures the optical power of the returned optical signal; the return light module is an optical fiber device and a passive device; the return light module has only one port, which is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested on the high-voltage side. The return light module is used to receive the input optical signal and return it to the polarization-maintaining optical fiber to be tested along the original optical path.

[0057] Specifically, the measurement module sends out an optical signal; the optical signal enters the polarization-maintaining optical fiber to be measured through the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room, the optical signal is transmitted along the polarization-maintaining optical fiber to be measured to the bare fiber part on the high-voltage side of the polarization-maintaining optical fiber to be measured, and is input into the return light module from the bare fiber port on the high-voltage side of the polarization-maintaining optical fiber to be measured; the optical signal is transmitted along the internal optical path of the return light module, and the return light module receives the input optical signal and returns it along the original optical path to the bare fiber port of the polarization-maintaining optical fiber to be measured on the high-voltage side; the returned optical signal is transmitted through the polarization-maintaining optical fiber to be measured to the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room, and then returns to the measurement module; when the measurement module receives the returned optical signal, the optical power of the returned optical signal is measured, and the optical power of the returned optical signal can be used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be measured.

[0058] The present application sends an optical signal to the polarization-maintaining optical fiber to be tested through a measuring module, and the optical signal is transmitted through the polarization-maintaining optical fiber to be tested and enters the return light module, and the return light module then returns the optical signal to the polarization-maintaining optical fiber to be tested according to the original optical path, so that the test module receives the returned optical signal transmitted through the polarization-maintaining optical fiber to be tested, and measures the optical power of the returned optical signal, which can be used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested. The present application can connect the spare core bare fiber part to the return light module first after the optical cable is laid, and the return light module is placed in the fiber fusion box. In the future, operation and maintenance only need to be carried out in the control room using the measuring module, and there is no need to shut down the high-voltage side, and it can be operated by one person, with low cost and high efficiency; and the return light module is an optical fiber device, passive, not affected by electromagnetic interference, and has high reliability; the measuring module of the present application integrates the functions of light source emission and optical power detection, and is both the emitting end and the receiving end of the optical signal, which is easy to carry and operate, and has strong practicality.

[0059] In one embodiment, if Figure 2 As shown, the polarization-maintaining optical fiber loss test device also includes a first optical fiber adapter module and a second optical fiber adapter module;

[0060] The first optical fiber adapter module is connected to the measurement module and is also used to connect to the bare fiber port in the polarization-maintaining optical fiber control room to be measured;

[0061] The second optical fiber adapter module is used to connect to the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side;

[0062] The measuring module inputs the optical signal into the polarization-maintaining optical fiber to be tested through the first optical fiber adapter module; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be tested through the second optical fiber adapter module, and returns the optical signal to the second optical fiber adapter module along the original optical path; the second optical fiber adapter module inputs the returned optical signal into the polarization-maintaining optical fiber to be tested; and the testing module receives the returned optical signal through the first optical fiber adapter module.

[0063] Among them, the fiber optic adapter module is the physical medium to establish the bare fiber port and the fiber optic connector, and can realize the transmission of optical signals between the bare fiber and the instrument interface without the need for fiber fusion.

[0064] Specifically, the optical signal emitted by the measuring module can enter the polarization-maintaining optical fiber to be measured through the first optical fiber adapter module, and be output from the polarization-maintaining optical fiber to be measured through the second optical fiber adapter module and enter the return light module; the return light module returns the optical signal along the original optical path, and the returned optical signal enters the polarization-maintaining optical fiber to be measured through the second optical fiber adapter module, and then returns to the measuring module through the first optical fiber adapter module, so that the measuring module can measure the optical power size when receiving the returned optical signal.

[0065] The first optical fiber adapter module and the second optical fiber adapter module of the present application can connect the bare fiber to the optical fiber interface of various measuring instruments without the need for a fiber splicing machine, thereby providing a detection means for on-site operation and maintenance and greatly improving the practicality of the polarization-maintaining optical fiber loss test device.

[0066] In one embodiment, the first optical fiber adapter module may include a first ceramic ferrule and a first clamping unit; the bottom of the first ceramic ferrule is disposed on the top of the first clamping unit;

[0067] The first clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber, and to allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber to pass through the bottom of the first clamping unit into the first ceramic ferrule;

[0068] The first ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room with the measurement module.

[0069] In one embodiment, the second optical fiber adapter module may include a second ceramic ferrule and a second clamping unit; the bottom of the second ceramic ferrule is disposed on the top of the second clamping unit;

[0070] The second clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located on the high-voltage side, and allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located on the high-voltage side to pass through the second ceramic ferrule from the bottom of the second clamping unit;

[0071] The second ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side with the return light module.

[0072] Specifically, the structural schematic diagram of the first optical fiber adapter module or the second optical fiber adapter module can be: Figure 3 As shown; the first ceramic ferrule of the first optical fiber adapter module and the second ceramic ferrule of the second optical fiber adapter module can be inserted into the optical fiber interface; the bare fiber end face is closely aligned with the optical signal receiving end face in the optical fiber interface, so that the optical signal can be efficiently coupled into the optical fiber interface for transmission; the first clamping unit and the second clamping unit are mainly used to reliably clamp the bare fiber to prevent the bare fiber from moving back and forth; the bare fiber penetrates from the bottom of the clamping unit until it passes through the ceramic ferrule and is exposed for more than a preset length (for example, 3 mm), and then a fiber optic cutting knife is used to cut the bare fiber. Figure 3 The bare fiber portion of the polarization-maintaining optical fiber to be measured located in the control room is inserted into the first ceramic ferrule from the bottom of the first clamping unit, and the first ceramic ferrule is connected to the optical fiber interface of the measurement module to transmit the optical signal; the bare fiber portion of the polarization-maintaining optical fiber to be measured located on the high-voltage side is inserted into the second ceramic ferrule from the bottom of the second clamping unit, and the second ceramic ferrule is connected to the optical fiber interface of the return light module to transmit the optical signal, thereby eliminating the need for a fiber fusion machine to perform fiber fusion.

[0073] In one embodiment, if Figure 4 As shown, the test module may include: a light source unit, a light splitting unit, an optical power detection unit and a first optical fiber interface;

[0074] The input end of the light splitting unit is connected to the light source unit; the output end of the light splitting unit is connected to the optical power detection unit; the input and output ends of the light splitting unit are connected to the first optical fiber interface; the first optical fiber interface is connected to the first optical fiber adapter module;

[0075] The light source unit is used to emit a light signal and input the light signal into the light splitting unit;

[0076] The optical splitter unit is used to input the optical signal into the polarization-maintaining optical fiber to be tested through the first optical fiber interface, receive the returned optical signal through the first optical fiber interface, and input the returned optical signal into the optical power detection unit;

[0077] The optical power detection unit is used to receive the returned optical signal and measure the optical power of the returned optical signal.

[0078] Among them, the light source unit can be a desktop light source or an integrated optoelectronic device, and its output end is an optical fiber or an optical fiber interface, and its main function is to emit an optical signal (the wavelength of the optical signal can be 1310 nanometers, which can be adjusted according to actual conditions); the splitter unit is used to split the returned optical signal, and it includes an output end, an input end and an input and output end; the outputs of each port of the splitter unit are optical fibers, and the input and output ends are both optical fiber connectors. The input end optical fiber connector of the splitter unit is physically connected to the optical fiber interface of the light source unit, and the output end optical fiber connector of the splitter unit is physically connected to the optical fiber interface of the optical power detection unit; the tail ends of the optical fibers at the input and output ends of the splitter unit are optical fiber interfaces, which are used to connect to the optical fiber connector of the first optical fiber adapter module; the optical power detection unit receives the returned optical signal and detects its optical power, and can display the measurement results.

[0079] Specifically, the light source unit emits an optical signal, the optical signal enters the input end of the splitter unit, and is output from the input and output ends of the splitter unit, enters the polarization-maintaining optical fiber to be tested through the first optical fiber adapter module, and the optical signal is then input into the return light module through the second optical fiber adapter module, and the return light module returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path; the returned optical signal enters the input and output ends of the splitter unit through the first optical fiber interface, and is output from the output end of the splitter unit, and enters the optical power detection unit, and the optical power of the returned optical signal is read by the optical power detection unit, so that the optical fiber loss of the polarization-maintaining optical fiber to be tested can be obtained through the optical power.

[0080] In one embodiment, if Figure 5 As shown, the return light module may include a fiber coupler and a second fiber interface;

[0081] The optical fiber tail end of the first end of the optical fiber coupler and the optical fiber tail end of the second end of the optical fiber coupler are fused together to form a ring optical path; the third end of the optical fiber coupler is connected to the second optical fiber interface;

[0082] The second optical fiber interface is used to connect the polarization-maintaining optical fiber to be tested.

[0083] The light return module may be a single-channel light return module, and the optical fiber coupler may be a 1×2 optical fiber coupler.

[0084] Specifically, when an optical signal is input from the third end of the optical fiber coupler through the second optical fiber interface, the first end of the optical fiber coupler and the second end of the optical fiber coupler each output an optical signal with 50% of the optical power of the original optical signal. When an optical signal is input from the first end of the optical fiber coupler or the second end of the optical fiber coupler, the third end of the optical fiber coupler outputs an optical signal with 50% of the optical power of the original optical signal. Therefore, the optical fiber tail ends of the first end of the optical fiber coupler and the second end of the optical fiber coupler are fused together to form a ring optical path. When an optical signal enters from the third end of the optical fiber coupler, the optical signal output from the first end of the optical fiber coupler enters the second end of the optical fiber coupler and is output through the third end of the optical fiber coupler. The optical signal output from the second end of the optical fiber coupler enters the second end of the optical fiber coupler and is also output from the third end of the optical fiber coupler. The two optical signals are combined and returned, realizing the light return function of the input optical signal, thereby inputting the returned optical signal to the polarization-maintaining optical fiber to be tested through the second optical fiber interface.

[0085] In one example, the light return module is a multi-channel light return module; the multi-channel light return module is obtained by integrating multiple single-channel light return modules.

[0086] Specifically, multiple single-channel light return modules are integrated together to obtain a multi-channel light return module. Multiple polarization-maintaining optical fibers to be tested are simultaneously connected to the multi-channel light return module to measure the optical power respectively, which can effectively improve the detection efficiency. The measurement module can also be integrated into a multi-channel measurement module accordingly, so as to measure multiple polarization-maintaining optical fibers to be tested at the same time, further improving the detection efficiency. For example, after the on-site laying of the optical CT polarization-maintaining optical cable is completed, all the spare optical fibers at the high-voltage side of the polarization-maintaining optical cable can be connected to the multi-channel light return module and placed in the fiber fusion box. In this way, each time, it is only necessary to measure in the control room through the measurement module, and there is no need to shut down the high-voltage side. It can be operated by one person, with low cost and greatly improved detection efficiency. The light return module is a passive optical fiber device, which is not affected by electromagnetic interference and has high reliability.

[0087] As mentioned above, the present application sends out an optical signal through a measurement module, so that the optical signal is transmitted in the polarization-maintaining optical fiber to be tested, and input into the return light module. The return light module returns the optical signal to the polarization-maintaining optical fiber to be tested according to the original optical path. The measurement module receives the returned optical signal output by the polarization-maintaining module to be tested and measures the optical power of the returned optical signal. The optical power can be used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested. The present application can detect the optical fiber loss of the polarization-maintaining optical fiber of the all-optical current transformer in the converter station, evaluate the optical fiber quality, ensure the availability of the spare polarization-maintaining optical fiber, and provide a convenient and efficient detection method for the inspection and maintenance of the optical CT in the converter station. The present application can solve the technical defects of unreliable measurement, low detection efficiency, and high detection cost caused by electromagnetic interference of high-voltage field strength in the existing technical solutions. The device is easy to carry, has strong practicality, strong scalability, simple structure, multiple expandable forms, and high detection efficiency. At the same time, it also meets the new requirements of the smart grid for improving the reliability and stability of optical CT.

[0088] In one embodiment, Figure 6 As shown, a polarization-maintaining optical fiber loss test system is provided, which may include: an all-optical fiber current transformer and the above-mentioned polarization-maintaining optical fiber loss test device;

[0089] The polarization-maintaining optical fiber loss test device is connected to the polarization-maintaining optical fiber to be tested of the all-optical current transformer; one end of the polarization-maintaining optical fiber to be tested is located in the control room, and the other end is located at the high-voltage side.

[0090] The polarization-maintaining optical fiber to be tested may be a long-distance polarization-maintaining optical fiber.

[0091] Specifically, by connecting the polarization-maintaining optical fiber to be tested of the all-optical fiber current transformer with the polarization-maintaining optical fiber loss test device, the optical power of the polarization-maintaining optical fiber to be tested can be obtained, and the optical fiber loss of the polarization-maintaining optical fiber to be tested can be obtained through the optical power, so as to evaluate the optical fiber quality and judge whether the polarization-maintaining optical fiber to be tested can be used normally. When the main polarization-maintaining optical fiber of the all-optical fiber current transformer fails, the polarization-maintaining optical fiber loss test device can be used to detect whether the spare optical fiber can be used normally, and the detection efficiency is high, thereby ensuring that the main polarization-maintaining optical fiber can be replaced by a normal spare polarization-maintaining optical fiber, avoiding the risk of increasing the difficulty of fault elimination and the time of fault handling by replacing the faulty spare polarization-maintaining optical fiber, ensuring the normal operation of the converter station, and meeting the requirements of the smart grid for the reliability and stability of the optical CT.

[0092] In one embodiment, a test method for the above-mentioned polarization-maintaining optical fiber loss test device is provided, which may include:

[0093] Obtain the optical power of the standard polarization-maintaining fiber and the optical power of the polarization-maintaining fiber to be tested; the optical power of the standard polarization-maintaining fiber is measured by connecting the bare fiber at one end of the standard polarization-maintaining fiber to the measurement module, and connecting the bare fiber at the other end of the standard polarization-maintaining fiber to the return light module; the optical power of the polarization-maintaining fiber to be tested is measured by connecting the bare fiber port of the polarization-maintaining fiber to be tested located in the control room to the measurement module, and connecting the bare fiber port of the polarization-maintaining fiber to be tested located on the high-voltage side to the return light module;

[0094] Based on the following model, the optical power of the standard polarization-maintaining fiber and the optical power of the polarization-maintaining fiber to be tested are processed to obtain the optical fiber loss of the polarization-maintaining fiber to be tested:

[0095]

[0096] Among them, K α is the optical fiber loss of the polarization-maintaining optical fiber to be tested; P n is the optical power of the polarization-maintaining fiber to be tested; P0 is the optical power of the standard polarization-maintaining fiber; L is the length of the polarization-maintaining fiber to be tested.

[0097] Specifically, the length of the standard polarization-maintaining optical fiber can be 1 meter; the bare fibers at both ends of a 1-meter-long standard polarization-maintaining optical fiber can be connected to the measurement module and the return light module respectively, so that the measurement module can measure the optical power standard value P0 of the standard polarization-maintaining optical fiber; the bare fibers at both ends of the polarization-maintaining optical fiber to be measured are connected to the measurement module and the return light module respectively, so that the optical power measurement value P of the polarization-maintaining optical fiber to be measured can be measured by the measurement module. n ; By substituting the optical power of the polarization-maintaining fiber to be tested, the length of the polarization-maintaining fiber to be tested, and the optical power of the standard polarization-maintaining fiber into That is, the optical fiber loss of the polarization-maintaining optical fiber to be tested is obtained.

[0098] As described above, the present application can realize convenient and rapid measurement of the optical fiber loss of the polarization-maintaining optical fiber to be tested of the all-optical fiber current transformer, with high detection efficiency and high reliability, and there is no need to use a fiber splicing machine to perform fiber splicing on the polarization-maintaining optical fiber to be tested, which provides a convenient and effective detection method for on-site operation and maintenance, meets the new requirements of the smart grid for improving the reliability and stability of the all-optical fiber current transformer, and ensures the safe operation of the power grid.

[0099] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0100] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0101] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A polarization-maintaining optical fiber loss test device, characterized in that: include: Measuring module; the measuring module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured of the all-fiber current transformer located in the control room; the measuring module is used to output an optical signal to the polarization-maintaining optical fiber to be measured; A light return module; the light return module is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side; the light return module receives the optical signal output by the polarization-maintaining optical fiber to be tested, and returns the optical signal to the polarization-maintaining optical fiber to be tested along the original optical path; the light return module includes a fiber coupler and a second fiber interface; the optical fiber tail end at the first end of the fiber coupler and the optical fiber tail end at the second end of the fiber coupler are fused together to form a ring optical path; the third end of the fiber coupler is connected to the second fiber interface; the second fiber interface is used to connect the polarization-maintaining optical fiber to be tested; The measuring module is also used to receive the returned optical signal outputted by the polarization-maintaining optical fiber to be measured, and measure the optical power of the returned optical signal; The optical power is used to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested.

2. The polarization-maintaining optical fiber loss test device according to claim 1, characterized in that: Also includes a first optical fiber adapter module and a second optical fiber adapter module; The first optical fiber adapter module is connected to the measuring module and is also used to connect to the bare fiber port in the polarization-maintaining optical fiber control room to be measured; The second optical fiber adapter module is used to connect to the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side; The measuring module inputs the optical signal into the polarization-maintaining optical fiber to be measured through the first optical fiber adapter module; the return light module receives the optical signal output by the polarization-maintaining optical fiber to be measured through the second optical fiber adapter module, and returns the optical signal to the second optical fiber adapter module along the original optical path; the second optical fiber adapter module inputs the returned optical signal into the polarization-maintaining optical fiber to be measured; and the measuring module receives the returned optical signal through the first optical fiber adapter module.

3. The polarization-maintaining optical fiber loss test device according to claim 1, characterized in that: The measuring module comprises: a light source unit, a light splitting unit, an optical power detection unit and a first optical fiber interface; The input end of the optical splitter unit is connected to the light source unit; the output end of the optical splitter unit is connected to the optical power detection unit; the input and output ends of the optical splitter unit are connected to the first optical fiber interface; the first optical fiber interface is connected to the first optical fiber adapter module; The light source unit is used to emit the light signal and input the light signal into the light splitting unit; The optical splitter unit is used to input the optical signal into the polarization-maintaining optical fiber to be tested through the first optical fiber interface, receive the returned optical signal through the first optical fiber interface, and input the returned optical signal into the optical power detection unit; The optical power detection unit is used to receive the returned optical signal and measure the optical power of the returned optical signal.

4. The polarization-maintaining optical fiber loss test device according to claim 2, characterized in that: The first optical fiber adapter module includes a first ceramic ferrule and a first clamping unit; the bottom of the first ceramic ferrule is arranged on the top of the first clamping unit; The first clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber, and to allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located in the control chamber to pass through the bottom of the first clamping unit into the first ceramic ferrule; The first ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room with the measurement module.

5. The polarization-maintaining optical fiber loss test device according to claim 2, characterized in that: The second optical fiber adapter module includes a second ceramic ferrule and a second clamping unit; the bottom of the second ceramic ferrule is arranged on the top of the second clamping unit; The second clamping unit is used to clamp the bare fiber portion of the polarization-maintaining optical fiber to be tested located at the high-voltage side, and allow the bare fiber portion of the polarization-maintaining optical fiber to be tested located at the high-voltage side to pass through the bottom of the second clamping unit into the second ceramic ferrule; The second ceramic ferrule is used to connect the bare fiber port of the polarization-maintaining optical fiber to be tested located on the high-voltage side with the return light module.

6. The polarization-maintaining optical fiber loss test device according to any one of claims 1 to 5, characterized in that: The light return module is a multi-channel light return module; the multi-channel light return module is obtained by integrating multiple single-channel light return modules.

7. A polarization-maintaining optical fiber loss test system, characterized in that: include: An all-fiber current transformer and a polarization-maintaining optical fiber loss test device as claimed in any one of claims 1 to 6; The polarization-maintaining optical fiber loss test device is connected to the polarization-maintaining optical fiber to be tested of the all-optical current transformer; one end of the polarization-maintaining optical fiber to be tested is located in the control room, and the other end is located on the high-voltage side.

8. A testing method for the polarization-maintaining optical fiber loss testing device according to claim 1, characterized in that: include: Obtaining the optical power of the standard polarization-maintaining optical fiber and the optical power of the polarization-maintaining optical fiber to be tested; The optical power of the standard polarization-maintaining optical fiber is measured by the measurement module when the bare fiber at one end of the standard polarization-maintaining optical fiber is connected to the measurement module, and the bare fiber at the other end of the standard polarization-maintaining optical fiber is connected to the return light module; the optical power of the polarization-maintaining optical fiber to be measured is measured by the measurement module when the bare fiber port of the polarization-maintaining optical fiber to be measured located in the control room is connected to the measurement module, and the bare fiber port of the polarization-maintaining optical fiber to be measured located on the high-voltage side is connected to the return light module; The optical power of the standard polarization-maintaining optical fiber and the optical power of the polarization-maintaining optical fiber to be tested are processed based on the following model to obtain the optical fiber loss of the polarization-maintaining optical fiber to be tested: Among them, K α is the optical fiber loss of the polarization-maintaining optical fiber to be tested; n is the optical power of the polarization-maintaining optical fiber to be tested; P0 is the optical power of the standard polarization-maintaining optical fiber; and L is the length of the polarization-maintaining optical fiber to be tested.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 8 are implemented.

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