CN114112312A - Polarization maintaining optical fiber loss testing device, system, method and storage medium - Google Patents
Polarization maintaining optical fiber loss testing device, system, method and storage medium Download PDFInfo
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
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Abstract
The application relates to a device, a system and a method for testing loss of a polarization maintaining optical fiber and a storage medium. The loss testing device for the polarization maintaining optical fiber comprises: a measurement module; the measuring module is used for connecting a bare fiber port of a polarization maintaining fiber to be measured of the all-fiber current transformer, which is positioned in the control room; the measuring module is used for outputting optical signals to the polarization maintaining optical fiber to be measured; a light returning module; the light returning module is used for connecting a bare fiber port of the polarization maintaining fiber to be tested, which is positioned at the high-voltage side; the light return module receives an 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 measuring module is also used for receiving a returned optical signal output by the polarization maintaining optical fiber to be measured and measuring the optical power of the returned optical signal; the optical power is used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured. The device has the advantages of simple structure, low cost, high measurement efficiency and high measurement reliability, and provides a convenient and efficient detection means for the maintenance and the operation of the polarization maintaining optical fiber of the all-fiber current transformer in the converter station.
Description
Technical Field
The present disclosure relates to the field of optical fiber detection technologies, and in particular, to a device, a system, a method, and a storage medium for testing loss of a polarization maintaining optical fiber.
Background
A localization all-fiber Current Transformer based on an optical sensing technology is called as a Current Transformer (Current Transformer) for short, a long-distance polarization-maintaining optical cable technical scheme is adopted, polarization devices such as a polarizer, a modulator and a delay ring are integrated in a secondary collection unit and placed in a screen cabinet of a comprehensive control room, pure polarization-maintaining optical fiber transmission is adopted between a primary body and the side of the screen cabinet, the overall anti-electromagnetic interference capability of the light CT is improved, and an electronic unit is easy to maintain (power failure is not needed at the primary side). The polarizer, the phase modulator and the delay ring are integrated in the acquisition unit, a modular plug-in design is adopted, the acquisition unit is connected with the primary sensor through polarization maintaining optical fibers, and the modulation loop signal line is also used for wiring inside the acquisition unit. The primary body of the optical CT is positioned on the outdoor high-voltage side and used for measuring primary current and returning sensitive parameters, the acquisition unit is positioned in the indoor control room and used for acquiring the returned sensitive parameters and demodulating and outputting digital quantity in direct proportion to the primary current, and the primary body is connected with the acquisition unit through a polarization maintaining optical cable to complete long-distance back and forth transmission of optical signals.
At present, the polarization maintaining optical cable used in the optical CT field is of an armored multi-core structure, that is, an optical cable with multiple polarization maintaining optical fibers embedded therein, 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 fibers are used as spare optical fibers to replace the failed main optical fiber. When the optical fiber is used on site, two ends of the primary polarization maintaining optical fiber are connected with the primary body and the acquisition unit through optical fiber fusion, and two ends of the standby optical fiber are in a suspension state without a physical connection mode for bare fibers. At present, a converter station of a direct current transmission system is not provided with a corresponding detection means, a detection condition of a standby core is not provided, the available state of the standby core cannot be ensured, and once a primary optical fiber has a problem, the difficulty of fault elimination and the time of fault treatment can be increased by replacing the standby optical fiber in an unknown state. The first method adopts a two-end measurement method, namely, a light source is used for emitting an optical signal at one end, and an optical power tester or an optical power meter is used for receiving the optical signal and outputting optical power at the other end; the second one adopts the existing advanced apparatus OTDR (Optical Time-Domain Reflectometer), which can realize single-ended Optical fiber measurement, has powerful functions, and can draw the loss curve of the whole Optical fiber and locate the fault point. However, the first test system is simple, high efficiency and high measurement accuracy for a short optical fiber can meet the use requirements, but for a long-distance optical fiber cable, the technical scheme measures efficiency one by one with low consumption and long time, the distance between the two ends is too far, people are required to work at all the two ends all the time and communication tools are required, but one end of each of the two ends of the optical CT polarization maintaining optical fiber is in a high voltage field, a strong electromagnetic interference signal affects the accuracy and reliability of a light source or an optical power meter, and the other end of the optical CT polarization maintaining optical fiber is in a control room and cannot communicate with a shielding communication signal in the control room to affect measurement. And the second uses OTDR to test polarization maintaining fiber transmission loss. The OTDR is generally used for the diagnosis of more professional optical fibers, and this kind of instrument generally is imported product, and the cost is higher, and it is difficult to maintain, need connect to the optic fibre more than one hundred meters at least earlier when using and be used for eliminating the test blind area, and external optic fibre also has the problem with the optic fibre butt joint that awaits measuring, and the test has the communication optic fibre of joint comparatively simply, but is comparatively difficult to the polarization maintaining optic fibre that both ends are bare fiber.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the existing optical fiber loss testing device is unreliable in measurement and low in detection efficiency.
Disclosure of Invention
In view of the above, it is desirable to provide a device, a system, a method and a storage medium for testing loss of a polarization maintaining optical fiber.
A polarization maintaining optical fiber loss testing device, comprising:
a measurement module; the measuring module is used for connecting a bare fiber port of a polarization maintaining fiber to be measured of the all-fiber current transformer, which is positioned in the control room; the measuring module is used for outputting optical signals to the polarization maintaining optical fiber to be measured;
a light returning module; the light returning module is used for connecting a bare fiber port of the polarization maintaining fiber to be tested, which is positioned at the high-voltage side; the light return module receives an 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 measuring module is also used for receiving a returned optical signal output by the polarization maintaining optical fiber to be measured and measuring the optical power of the returned optical signal; the optical power is used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured.
In one embodiment, the system further comprises a first fiber-optic adapter module and a second fiber-optic adapter module;
the first optical fiber adapter module is connected with the measuring module and is also used for connecting a bare fiber port in the polarization maintaining optical fiber control room to be measured;
the second optical fiber adapter module is used for connecting a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned at the high-voltage side;
the measuring module inputs an optical signal into the polarization maintaining optical fiber to be measured through the first optical fiber adapting module; the light return module receives an optical signal output by the polarization maintaining optical fiber to be tested through the second optical fiber adaptation module and returns the optical signal to the second optical fiber adaptation 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; the test module receives the returned optical signal through the first optical fiber adapter module.
In one embodiment, the test module comprises: the optical power detection device 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 light splitting unit is connected with the light source unit; the output end of the light splitting unit is connected with the optical power detection unit; the input end and the output end of the light splitting unit are connected with a first optical fiber interface; the first optical fiber interface is connected with the first optical fiber adapter module;
the light source unit is used for emitting an optical signal and inputting the optical signal into the light splitting unit;
the optical splitting unit is used for inputting an optical signal into the polarization maintaining optical fiber to be detected through the first optical fiber interface, receiving a returned optical signal through the first optical fiber interface, and inputting the returned optical signal into the optical power detection unit;
the optical power detection unit is used for receiving the returned optical signal and measuring the optical power of the returned optical signal.
In one embodiment, the light returning module comprises a fiber coupler and a second fiber interface;
the tail end of the optical fiber at the first end of the optical fiber coupler and the tail end of the optical fiber at the second end of the optical fiber coupler are welded together to form an annular light path; the third end of the optical fiber coupler is connected with a second optical fiber interface;
the second optical fiber interface is used for connecting the polarization maintaining optical fiber to be tested.
In one embodiment, the first fiber optic adapter module includes a first ferrule and a first clamping unit; the bottom of the first ceramic ferrule is arranged at the top of the first clamping unit;
the first clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, to penetrate into the first ceramic ferrule from the bottom of the first clamping unit;
the first ceramic ferrule is used for connecting a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control chamber, with the measuring module.
In one embodiment, the second fiber optic adapter module includes a second ferrule and a second clamping unit; the bottom of the second ceramic ferrule is arranged at the top of the second clamping unit;
the second clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, to penetrate into the second ceramic ferrule from the bottom of the second clamping unit;
the second ceramic ferrule is used for connecting a bare fiber port of the polarization maintaining fiber to be tested, which is positioned on the high-voltage side, with the light returning module.
In one embodiment, the light returning module is a multi-channel light returning module; the multi-channel light returning module is obtained by integrating a plurality of single-channel light returning modules.
A polarization maintaining optical fiber loss testing system, comprising: the all-fiber current transformer and the polarization maintaining fiber loss testing device are arranged on the optical fiber;
the polarization maintaining optical fiber loss testing device is connected with a polarization maintaining optical fiber to be tested of the all-fiber current transformer; one end of the polarization maintaining optical fiber to be tested is positioned in the control chamber, and the other end of the polarization maintaining optical fiber to be tested is positioned on the high-voltage side.
A test method for the polarization maintaining optical fiber loss test device comprises the following steps:
acquiring the optical power of a standard polarization maintaining optical fiber and the optical power of a polarization maintaining optical fiber to be detected; the optical power of the standard polarization maintaining optical fiber is obtained by measurement of the measuring module under the condition that the bare fiber at one end of the standard polarization maintaining optical fiber is connected into the measuring module and the bare fiber at the other end of the standard polarization maintaining optical fiber is connected back to the optical module; the optical power of the polarization maintaining optical fiber to be measured is obtained by measurement of the measuring module under the condition that a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control room, is connected into the measuring module and a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned at the high-voltage side, is connected into the light returning module;
processing the optical power of the standard polarization maintaining optical fiber and the optical power of the polarization maintaining optical fiber to be tested based on the following models to obtain the optical fiber loss of the polarization maintaining optical fiber to be tested:
wherein, KαThe optical fiber loss of the polarization maintaining optical fiber to be measured; pnThe optical power of the polarization maintaining optical fiber to be measured; p0Is the optical power of a standard polarization maintaining fiber; and L is the length of the polarization maintaining fiber to be measured.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
One of the above technical solutions has at least the following advantages and beneficial effects:
the method comprises the steps that a testing module outputs optical signals to a bare fiber port, located in a control room, of a polarization maintaining optical fiber to be tested of the all-optical line current transformer, and the optical signals are transmitted to the bare fiber port, located on a high-voltage side, of the polarization maintaining optical fiber to be tested through the optical fiber to be tested; the light return module receives an 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 measuring module receives a returned optical signal output by the polarization maintaining optical fiber to be measured, and measures the optical power of the returned optical signal, wherein the optical power can be used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured. The loss measurement device is simple in structure and low in cost, loss measurement can be performed on the main optical fiber and the standby optical fiber in the polarization maintaining optical cable laid by the all-fiber current transformer in the cable trench, so that the quality of the optical fiber is evaluated, detection of the standby core of the all-fiber current transformer is realized, the polarization maintaining optical cable of a standby part can be detected, the availability of the standby part is ensured, and a convenient and efficient detection means is provided for maintenance and operation of the polarization maintaining optical fiber of the all-fiber current transformer in the converter station; the method and the device can solve the technical defects of unreliable measurement, low detection efficiency and high detection cost caused by high-voltage field intensity electromagnetic interference in the prior art, so as to meet the new requirement of the intelligent power grid on the improvement of the reliability and the stability of the all-fiber current transformer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a loss testing apparatus for a polarization maintaining optical fiber according to an embodiment;
FIG. 2 is a schematic structural diagram of a loss testing apparatus for a polarization maintaining fiber according to another embodiment;
FIG. 3 is a schematic diagram of the structure of a first fiber optic adapter module or a second fiber optic adapter module in one embodiment;
FIG. 4 is a block diagram of a test module in one embodiment;
FIG. 5 is a block diagram of an embodiment of a light return module;
FIG. 6 is a block diagram of a loss testing system for polarization maintaining fiber in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, there is provided a polarization maintaining optical fiber loss testing apparatus, which may include:
a measurement module; the measuring module is used for connecting a bare fiber port of a polarization maintaining fiber to be measured of the all-fiber current transformer, which is positioned in the control room; the measuring module is used for outputting optical signals to the polarization maintaining optical fiber to be measured;
a light returning module; the light returning module is used for connecting a bare fiber port of the polarization maintaining fiber to be tested, which is positioned at the high-voltage side; the light return module receives an 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 measuring module is also used for receiving a returned optical signal output by the polarization maintaining optical fiber to be measured and measuring the optical power of the returned optical signal; the optical power is used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured.
The measuring module is not only a sending end but also a receiving end of the optical signal, namely, the measuring module provides the optical signal required by the optical fiber loss testing device for measurement, and measures the optical power of the returned optical signal; the light returning module is an optical fiber device and a passive device; the light returning module is provided with only one port and is used for connecting a bare fiber port of the polarization maintaining optical fiber to be tested, and the light returning module is used for receiving an input optical signal and then returning the received optical signal to the polarization maintaining optical fiber to be tested along an original optical path.
Specifically, the measuring module emits an optical signal; an optical signal enters the polarization maintaining optical fiber to be tested through a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned in the control room, is transmitted to a bare fiber part at the high-voltage side of the polarization maintaining optical fiber to be tested along the polarization maintaining optical fiber to be tested, and is input into the light returning module from the bare fiber port at the high-voltage side of the polarization maintaining optical fiber to be tested; the optical signal is transmitted along an optical path inside the optical returning module, and the optical returning module returns the received input optical signal to a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned at the high-voltage side, along the original optical path; the returned optical signal is transmitted to a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control room, through the polarization maintaining optical fiber to be measured, so as to return to the measuring module; and under the condition that the measuring module receives the returned optical signal, measuring the optical power of the returned optical signal, wherein the optical power of the returned optical signal can be used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured.
This application sends out optical signal to the polarization maintaining optical fiber that awaits measuring through measuring module, and optical signal gets into back optical module through the transmission of the polarization maintaining optical fiber that awaits measuring, and back optical module returns optical signal for the polarization maintaining optical fiber that awaits measuring according to former light path again to test module receives the optical signal of returning through the transmission of the polarization maintaining optical fiber that awaits measuring, and measures the optical power of the optical signal that returns, and this optical power can be used for obtaining the optical fiber loss of the polarization maintaining optical fiber that awaits measuring. According to the optical fiber fusion box, the bare fiber part of the standby core can be connected into the optical fiber return module firstly after the optical cable is laid, the optical fiber return module is placed in the optical fiber fusion box, operation and maintenance can be carried out in a control room only by using the measuring module, power failure does not need to be carried out on the high-voltage side, the optical fiber fusion box can be operated by a single person, and the optical fiber fusion box is low in cost and high in efficiency; the light returning module is an optical fiber device, is passive, is not influenced by electromagnetic interference and has high reliability; the measuring module of this application has integrateed the light source and has sent and the function that optical power detected, both is the sending end of light signal and also is the receiving terminal of light signal, portable and operation, and the practicality is strong.
In one embodiment, as shown in fig. 2, the polarization maintaining fiber loss testing apparatus further includes a first fiber adapting module and a second fiber adapting module;
the first optical fiber adapter module is connected with the measuring module and is also used for connecting a bare fiber port in the polarization maintaining optical fiber control room to be measured;
the second optical fiber adapter module is used for connecting a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned at the high-voltage side;
the measuring module inputs an optical signal into the polarization maintaining optical fiber to be measured through the first optical fiber adapting module; the light return module receives an optical signal output by the polarization maintaining optical fiber to be tested through the second optical fiber adaptation module and returns the optical signal to the second optical fiber adaptation 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; the test module receives the returned optical signal through the first optical fiber adapter module.
The optical fiber adapter module is a physical medium for establishing an optical fiber bare fiber port and an optical fiber joint, and transmission of optical signals between bare fibers and an instrument interface can be realized without melting the fibers.
Specifically, an optical signal emitted by the measurement module can enter the polarization maintaining optical fiber to be measured through the first optical fiber adapter module, and is output from the polarization maintaining optical fiber to be measured through the second optical fiber adapter module to enter the light return module; the light returning module returns the optical signal along the original optical path, the returned optical signal enters the polarization maintaining optical fiber to be measured through the second optical fiber adapting module and then returns to the measuring module through the first optical fiber adapting module, and therefore the measuring module measures the optical power of the measuring module under the condition that the returned optical signal is received.
The first optical fiber adapter module and the second optical fiber adapter module can be used for connecting bare fibers into optical fiber interfaces of various measuring instruments, fiber melting machines are not needed for melting the fibers, a detection means is provided for field operation and maintenance, and the practicability of the polarization maintaining optical fiber loss testing device is greatly improved.
In one embodiment, the first fiber optic adapter module can include a first ferrule and a first clamping unit; the bottom of the first ceramic ferrule is arranged at the top of the first clamping unit;
the first clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, to penetrate into the first ceramic ferrule from the bottom of the first clamping unit;
the first ceramic ferrule is used for connecting a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control chamber, with the measuring module.
In one embodiment, the second fiber optic adapter module may include a second ferrule and a second clamping unit; the bottom of the second ceramic ferrule is arranged at the top of the second clamping unit;
the second clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, to penetrate into the second ceramic ferrule from the bottom of the second clamping unit;
the second ceramic ferrule is used for connecting a bare fiber port of the polarization maintaining fiber to be tested, which is positioned on the high-voltage side, with the light returning module.
Specifically, the schematic structural diagrams of the first fiber optic adapter module or the second fiber optic adapter module can be both shown in fig. 3; 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; aligning the end face of the bare fiber to the receiving end face of the optical signal in the optical fiber interface in a close-range collimation manner, 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 for reliably clamping the bare fiber and preventing the bare fiber from moving back and forth; the bare fiber penetrates through the bottom of the clamping unit until the bare fiber penetrates through the ferrule and is exposed to a preset length (for example, more than 3 mm), and then a fiber cutter is used for cutting at the position shown in figure 3 to enable the end face of the bare fiber to be flush with the end face of the ferrule; the bare fiber part of the polarization maintaining fiber to be tested, which is positioned in the control chamber, penetrates into the first ceramic ferrule from the bottom of the first clamping unit, and the first ceramic ferrule is connected with the fiber interface of the measuring module to transmit optical signals; the bare fiber part of the polarization maintaining fiber to be tested, which is positioned at the high-voltage side, penetrates into the second ceramic ferrule from the bottom of the second clamping unit, and the second ceramic ferrule is connected with the fiber interface of the light returning module to transmit optical signals, so that the fiber melting machine is not needed to melt the fiber.
In one embodiment, as shown in fig. 4, the test module may include: the optical power detection device 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 light splitting unit is connected with the light source unit; the output end of the light splitting unit is connected with the optical power detection unit; the input end and the output end of the light splitting unit are connected with a first optical fiber interface; the first optical fiber interface is connected with the first optical fiber adapter module;
the light source unit is used for emitting an optical signal and inputting the optical signal into the light splitting unit;
the optical splitting unit is used for inputting an optical signal into the polarization maintaining optical fiber to be detected through the first optical fiber interface, receiving a returned optical signal through the first optical fiber interface, and inputting the returned optical signal into the optical power detection unit;
the optical power detection unit is used for receiving the returned optical signal and measuring the optical power of the returned optical signal.
The light source unit can be a desk light source or an integrated photoelectric device, and the output end of the light source unit is an optical fiber or an optical fiber interface, which is mainly used for emitting optical signals (the wavelength of the optical signals can be 1310 nanometers and can be adjusted according to actual conditions); the light splitting unit is used for splitting the returned optical signal and comprises an output end, an input end and an input and output end; the output of each port of the light splitting unit is an optical fiber, the input end and the output end of the light splitting unit are optical fiber connectors, the optical fiber connector of the input end of the light splitting unit is physically connected with the optical fiber interface of the light source unit, and the optical fiber connector of the output end of the light splitting unit is physically connected with the optical fiber interface of the optical power detection unit; the tail end of the input/output end optical fiber of the light splitting unit is an optical fiber interface which is used for being connected with an optical fiber joint of the first optical fiber adapter module; the optical power detection unit receives the returned optical signal, detects the optical power of the optical signal and can display the measurement result.
Specifically, the light source unit emits an optical signal, the optical signal enters an input end of the light splitting unit, is output from an input end and an output end of the light splitting unit, enters the polarization maintaining optical fiber to be tested through the first optical fiber adapter module, is input into the light returning module through the second optical fiber adapter module, and returns the optical signal to the polarization maintaining optical fiber to be tested along an original optical path through the light returning module; the returned optical signal enters the input and output end of the light splitting unit through the first optical fiber interface, is output from the output end of the light splitting unit, enters the optical power detection unit, and reads the optical power of the returned optical signal through the optical power detection unit, so that the optical fiber loss of the polarization maintaining optical fiber to be detected can be obtained through the optical power.
In one embodiment, as shown in fig. 5, the light returning module may include a fiber coupler and a second fiber interface;
the tail end of the optical fiber at the first end of the optical fiber coupler and the tail end of the optical fiber at the second end of the optical fiber coupler are welded together to form an annular light path; the third end of the optical fiber coupler is connected with a second optical fiber interface;
the second optical fiber interface is used for connecting the polarization maintaining optical fiber to be tested.
The light returning module can be a single-channel light returning module, and the optical fiber coupler can be a 1 × 2 optical fiber coupler.
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 have an optical signal output of 50% of the optical power of the original optical signal, and when the 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 has an optical signal output of 50% of the optical power of the original optical signal. Therefore, the first end of the optical fiber coupler and the tail end of the optical fiber of the second end of the optical fiber coupler are welded together to form an annular light path, when an optical signal enters from the third end of the optical fiber coupler, the optical signal output by 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 by 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 then return, the light return function of the input optical signal is realized, and the returned optical signal is input to the polarization maintaining optical fiber to be tested through the second optical fiber interface.
In one example, the light return module is a multi-channel light return module; the multi-channel light returning module is obtained by integrating a plurality of single-channel light returning modules.
Specifically, get multichannel back optical module with a plurality of single channel back optical module integration together, return optical module through the multichannel and connect many polarization maintaining optical fibers that await measuring simultaneously and carry out the optical power measurement respectively, can effectively improve detection efficiency, also can be correspondingly integrated into multichannel measuring module with measuring module to measure many polarization maintaining optical fibers that await measuring simultaneously, further improve detection efficiency. For example, after the optical CT polarization maintaining optical cable is laid on site, all the bare optical fibers at the high-voltage end of the polarization maintaining optical cable can be connected to the multi-channel light returning module and placed in the fiber melting box. Therefore, the measurement in the control room is only needed to be carried out through the measuring module at every time, the high-voltage side does not need to be powered off, the single person can operate, the cost is low, the detection efficiency is greatly improved, the light returning module is an optical fiber passive device, the influence of electromagnetic interference is avoided, and the reliability is high.
In the application, the measuring module sends out the optical signal, so that the optical signal is transmitted in the polarization maintaining optical fiber to be measured and is input into the light returning module, the light returning module returns the optical signal to the polarization maintaining optical fiber to be measured according to the original optical path, the measuring module receives the returned optical signal output by the polarization maintaining optical fiber to be measured and measures the optical power of the returned optical signal, and the optical power can be used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured. The optical fiber loss of the polarization maintaining optical fiber of the all-fiber current transformer in the converter station can be detected, the quality of the optical fiber is evaluated, the availability of the polarization maintaining optical fiber of a spare part is ensured, and a convenient and efficient detection means is provided for the overhaul, operation and maintenance of the optical CT in the converter station. The device can solve the technical defects of unreliable measurement, low detection efficiency, high detection cost and the like caused by high-voltage field intensity electromagnetic interference in the prior art, is easy to carry, strong in practicability, strong in popularization, simple in structure, multiple in expandable form and high in detection efficiency, and simultaneously meets the new requirements of the intelligent power grid on the improvement of the reliability and the stability of the optical CT.
In one embodiment, as shown in fig. 6, there is provided a polarization maintaining fiber loss testing system, which may include: the all-fiber current transformer and the polarization maintaining fiber loss testing device are arranged on the optical fiber;
the polarization maintaining optical fiber loss testing device is connected with a polarization maintaining optical fiber to be tested of the all-fiber current transformer; one end of the polarization maintaining optical fiber to be tested is positioned in the control chamber, and the other end of the polarization maintaining optical fiber to be tested is positioned on the high-voltage side.
The polarization maintaining fiber to be tested can be a long-distance polarization maintaining fiber.
Specifically, the optical power of the polarization maintaining optical fiber to be tested can be obtained by connecting the polarization maintaining optical fiber to be tested of the all-fiber current transformer with the polarization maintaining optical fiber loss testing device, the optical fiber loss of the polarization maintaining optical fiber to be tested can be obtained through the optical power, the quality of the optical fiber is evaluated, whether the polarization maintaining optical fiber to be tested can be normally used is judged, when the main polarization maintaining optical fiber of the all-fiber current transformer breaks down, whether the standby optical fiber can be normally used or not can be detected through the polarization maintaining optical fiber loss testing device, the detection efficiency is high, the normal standby polarization maintaining optical fiber can be used for replacing the main polarization maintaining optical fiber, the difficulty of fault elimination and the risk of fault processing time are avoided due to the fact that the standby polarization maintaining optical fiber to be replaced is replaced, the normal operation of a converter station is ensured, and the requirements of an intelligent power grid on reliability and stability of the optical CT are met.
In one embodiment, a testing method for the above-mentioned polarization maintaining optical fiber loss testing apparatus is provided, which may include:
acquiring the optical power of a standard polarization maintaining optical fiber and the optical power of a polarization maintaining optical fiber to be detected; the optical power of the standard polarization maintaining optical fiber is obtained by measurement of the measuring module under the condition that the bare fiber at one end of the standard polarization maintaining optical fiber is connected into the measuring module and the bare fiber at the other end of the standard polarization maintaining optical fiber is connected back to the optical module; the optical power of the polarization maintaining optical fiber to be measured is obtained by measurement of the measuring module under the condition that a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control room, is connected into the measuring module and a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned at the high-voltage side, is connected into the light returning module;
processing the optical power of the standard polarization maintaining optical fiber and the optical power of the polarization maintaining optical fiber to be tested based on the following models to obtain the optical fiber loss of the polarization maintaining optical fiber to be tested:
wherein, KαThe optical fiber loss of the polarization maintaining optical fiber to be measured; pnThe optical power of the polarization maintaining optical fiber to be measured; p0Is the optical power of a standard polarization maintaining fiber; and L is the length of the polarization maintaining fiber to be measured.
Specifically, the length of the standard polarization maintaining fiber may be 1 meter; the bare fibers at two ends of 1 standard polarization maintaining optical fiber with the length of 1 meter can be respectively connected into the measuring module and the light returning module, so that the measuring module can measure the optical power standard value P of the standard polarization maintaining optical fiber0(ii) a Bare fibers at two ends of the polarization maintaining optical fiber to be measured are respectively connected into the measuring module and the light returning module, so that the measuring module can measure and obtain the optical power measured value P of the polarization maintaining optical fiber to be measuredn(ii) a By substituting the optical power of the polarization maintaining optical fiber to be tested, the length of the polarization maintaining optical fiber to be tested and the optical power of the standard polarization maintaining optical fiber
And obtaining the optical fiber loss of the polarization maintaining optical fiber to be measured.
More than, this application can realize convenient, measure all-fiber current transformer's the optical fiber loss of the polarization maintaining optical fiber that awaits measuring fast, and detection efficiency is high, and the reliability is high, need not to carry out the fuse to the polarization maintaining optical fiber that awaits measuring through the fuse fiber machine, provides convenient effectual detection means for on-the-spot fortune dimension, has satisfied smart power grids and has promoted the new requirement of all-fiber current transformer reliability and stability, has guaranteed electric wire netting operation safety.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A polarization maintaining optical fiber loss testing device, comprising:
a measurement module; the measuring module is used for connecting a bare fiber port of a polarization maintaining fiber to be measured of the all-fiber current transformer, which is positioned in the control room; the measuring module is used for outputting optical signals to the polarization maintaining optical fiber to be measured;
a light returning module; the light return module is used for connecting a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned at 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 an original optical path;
the measuring module is also used for receiving a returned optical signal output by the polarization maintaining optical fiber to be measured and measuring the optical power of the returned optical signal; and the optical power is used for obtaining the optical fiber loss of the polarization maintaining optical fiber to be tested.
2. The apparatus of claim 1, further comprising a first fiber optic adapter module and a second fiber optic adapter module;
the first optical fiber adapter module is connected with the measuring module and is also used for connecting a bare fiber port in the polarization maintaining optical fiber control room to be measured;
the second optical fiber adapter module is used for connecting a bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned at the high-voltage side;
the measurement module inputs the optical signal into the polarization maintaining optical fiber to be measured through the first optical fiber adaptation module; the light return 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; the test module receives the returned optical signal through the first optical fiber adaptation module.
3. The apparatus of claim 1, wherein the test module comprises: the optical power detection device 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 light splitting unit is connected with the light source unit; the output end of the light splitting unit is connected with the optical power detection unit; the input end and the output end of the light splitting unit are connected with the first optical fiber interface; the first optical fiber interface is connected with the first optical fiber adapter module;
the light source unit is used for emitting the optical signal and inputting the optical signal into the light splitting unit;
the light splitting unit is used for inputting the optical signal into the polarization maintaining optical fiber to be detected through the first optical fiber interface, receiving the returned optical signal through the first optical fiber interface, and inputting the returned optical signal into the optical power detection unit;
the optical power detection unit is used for receiving the returned optical signal and measuring the optical power of the returned optical signal.
4. The apparatus of claim 1, wherein the return module comprises a fiber coupler and a second fiber interface;
the tail end of the optical fiber at the first end of the optical fiber coupler and the tail end of the optical fiber at the second end of the optical fiber coupler are welded together to form an annular light path; the third end of the optical fiber coupler is connected with the second optical fiber interface;
the second optical fiber interface is used for connecting the polarization maintaining optical fiber to be tested.
5. The apparatus of claim 2, wherein the first fiber adapter module comprises a first ferrule and a first clamping unit; the bottom of the first ceramic ferrule is arranged at the top of the first clamping unit;
the first clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned in the control chamber, to penetrate into the first ceramic ferrule from the bottom of the first clamping unit;
the first ceramic ferrule is used for connecting a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in the control chamber, with the measuring module.
6. The apparatus of claim 2, wherein the second fiber adapter module comprises a second ferrule and a second clamping unit; the bottom of the second ceramic ferrule is arranged at the top of the second clamping unit;
the second clamping unit is used for clamping the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, and enabling the bare fiber part of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, to penetrate into the second ceramic ferrule from the bottom of the second clamping unit;
the second ceramic ferrule is used for connecting the bare fiber port of the polarization maintaining optical fiber to be tested, which is positioned on the high-voltage side, with the optical return module.
7. The loss testing device of any one of claims 1 to 6, wherein the light return module is a multi-channel light return module; the multi-channel light returning module is obtained by integrating a plurality of single-channel light returning modules.
8. A system for loss testing of a polarization maintaining optical fiber, comprising: an all-fiber current transformer and the polarization maintaining fiber loss testing apparatus of any one of claims 1 to 7;
the polarization maintaining optical fiber loss testing device is connected with a polarization maintaining optical fiber to be tested of the all-fiber current transformer; one end of the polarization maintaining optical fiber to be tested is positioned in the control chamber, and the other end of the polarization maintaining optical fiber to be tested is positioned on the high-voltage side.
9. A test method for the polarization maintaining optical fiber loss test device of claim 1, comprising:
acquiring the optical power of a 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 obtained by measurement of the measuring module under the condition that the bare fiber at one end of the standard polarization maintaining optical fiber is connected into the measuring module and the bare fiber at the other end of the standard polarization maintaining optical fiber is connected into the light returning module; the optical power of the polarization maintaining optical fiber to be measured is obtained by measurement of the measuring module under the condition that a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned in a control room, is connected into the measuring module and a bare fiber port of the polarization maintaining optical fiber to be measured, which is positioned on a high-voltage side, is connected into the light returning module;
processing the optical power of the standard polarization maintaining optical fiber and the optical power of the polarization maintaining optical fiber to be tested based on the following models to obtain the optical fiber loss of the polarization maintaining optical fiber to be tested:
wherein, KαThe optical fiber loss of the polarization maintaining optical fiber to be measured is measured; pnThe optical power of the polarization maintaining optical fiber to be measured; p0The optical power of the standard polarization maintaining optical fiber; and L is the length of the polarization maintaining optical fiber to be measured.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as claimed in claim 9.
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