CN217716870U - Optical fiber loss testing device - Google Patents
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Abstract
The utility model discloses a testing arrangement of optical fiber loss, wherein, testing arrangement of above-mentioned optical fiber loss includes: the optical fiber loss testing device comprises a plurality of light beam generating modules, a light beam coupling module, a light beam separating module and a plurality of loss testing modules, wherein a plurality of input ends of the light beam coupling module are respectively connected with the light beam generating modules, an output end of the light beam coupling module is connected with an input end of an optical fiber to be tested, an input end of the light beam separating module is connected with an output end of the optical fiber to be tested, and a plurality of output ends of the light beam separating module are respectively connected with the loss testing modules. By adopting the technical scheme, the problems that the convenience degree of the test of the optical fiber loss is low and the like in the related technology are solved.
Description
Technical Field
The utility model relates to an optics field particularly, relates to a testing arrangement of optical fiber loss.
Background
The optical fiber laser is characterized in that pumping light emitted by a semiconductor pumping tube is absorbed by a rare earth element-doped gain fiber to obtain light, the light is subjected to oscillation amplification by an FBG fiber grating, and then the light is output through processes such as multistage amplification to obtain laser beams.
However, as the application direction of the gain fiber laser in the industrial field is continuously expanded, the laser beam output by the fiber laser has higher requirements on the stability of the beam quality and the stability of the output power, however, a skilled person finds through a large number of experiments that a linear decrease phenomenon occurs in the output power of the fiber laser as the high power operation time of the gain fiber laser is gradually increased, and the phenomenon is irreversible, which is also called a photon darkening effect, which is a phenomenon that the particle fluorescence lifetime of the gain fiber is shortened, the quantum loss is gradually increased, and the process is unrecoverable. The heat energy is generated in the form of heat energy, so that the heat energy of the gain fiber is gradually increased, and therefore, the loss test and the heat energy monitoring of the gain fiber are indispensable in the fiber laser technology.
In the prior art, there are two main methods for loss testing of a gain fiber: the first is a spectral analysis method, which analyzes the loss of a gain fiber from a spectrum by collecting the change condition of an emission spectrum induced by monochromatic light after the monochromatic light with a specific wavelength and pumping light pass through the gain fiber, but the method has a complicated laser light path structure, needs a plurality of filters and amplifiers, also needs narrow-bandwidth monochromatic light, and has complicated operation, thus not meeting the requirement of high-efficiency test in production. The second test method is a power copying machine type, and the method comprises the steps of welding a gain fiber to be tested with a pump source, copying for 2 hours or more, welding signal detection light, copying for the same time, recording the output power of the detection light at intervals, and calculating to obtain the loss of the ytterbium-doped fiber. The process steps are complicated and complex, and real-time monitoring cannot be achieved.
Aiming at the problems of low convenience of testing the optical fiber loss and the like in the related technology, an effective solution is not provided yet.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a testing arrangement of optical fiber loss to in solving the correlation technique at least, the lower scheduling problem of convenient degree of optical fiber loss's test.
According to the utility model discloses an embodiment provides a testing arrangement of optical fiber loss, includes: the optical fiber loss tester comprises a plurality of light beam generating modules, a light beam coupling module, a light beam separating module and a plurality of loss testing modules, wherein a plurality of input ends of the light beam coupling module are respectively connected with the light beam generating modules, an output end of the light beam coupling module is connected with an input end of an optical fiber to be tested, an input end of the light beam separating module is connected with an output end of the optical fiber to be tested, and a plurality of output ends of the light beam separating module are respectively connected with the loss testing modules.
In one exemplary embodiment, the beam coupling module includes: the optical fiber testing device comprises a wave combiner and a mode field adapter, wherein a plurality of input ends of the wave combiner are respectively connected with a plurality of light beam generators, an output end of the wave combiner is connected with an input end of the mode field adapter, and an output end of the mode field adapter is connected with an input grating of the optical fiber to be tested.
In an exemplary embodiment, the beam splitting module includes a splitter, wherein an input end of the splitter is connected to the output grating of the optical fiber to be tested, and a plurality of output ends of the splitter are respectively connected to the plurality of loss testing modules.
In one exemplary embodiment, the beam coupling module further comprises the input grating, and the beam splitting module further comprises the output grating.
In one exemplary embodiment, the plurality of beam generation modules comprises: a laser light generator and a signal light generator, wherein,
the laser generator is connected with a first input end of the light beam coupling module, and the signal light generator is connected with a second input end of the light beam coupling module.
In one exemplary embodiment, the plurality of loss test modules includes: the laser beam splitting module comprises a laser tester and a signal light tester, wherein the laser tester is connected with the first output end of the beam splitting module, and the signal light tester is connected with the second output end of the beam splitting module.
In one exemplary embodiment, the laser tester includes: the optical power meter comprises a first filter and a first power meter, wherein the input end of the first filter is connected with the output end of the beam splitting module, and the output end of the first filter is connected with the first power meter.
In one exemplary embodiment, the signal light tester includes: the input end of the second filter is connected with the output end of the beam splitting module, and the output end of the second filter is connected with the second power meter.
In an exemplary embodiment, the signal light tester further includes: and the second power meter and the second filter are connected through the coupling mirror group.
In one exemplary embodiment, the apparatus for testing the loss of the optical fiber further includes: the temperature acquisition ends of the temperature sensors are respectively connected with the input grating of the optical fiber to be tested, the gain optical fiber of the optical fiber to be tested and the output grating of the optical fiber to be tested, and the data transmission ends of the temperature sensors are connected with the temperature data processor.
The embodiment of the utility model provides an in, the testing arrangement of optical fiber loss includes: the optical fiber loss testing device comprises a plurality of light beam generating modules, a light beam coupling module, a light beam separating module and a plurality of loss testing modules, wherein a plurality of input ends of the light beam coupling module are respectively connected with the light beam generating modules, an output end of the light beam coupling module is connected with an input end of an optical fiber to be tested, an input end of the light beam separating module is connected with an output end of the optical fiber to be tested, a plurality of output ends of the light beam separating module are respectively connected with the loss testing modules, namely, a plurality of light beams generated by the light beam generating modules are simultaneously coupled into the optical fiber to be tested through the light beam coupling module, the light beams undergo a loss process in the optical fiber to be tested under the condition that independent transmission is not interfered with each other, then the light beams transmitted in the same optical fiber are separated through the light beam separating module, and finally, the loss conditions of the optical fiber to be tested under the respective effects of the light beams are synchronously tested through the loss testing modules. By adopting the technical scheme, the problems that the convenience degree of the test of the optical fiber loss is low and the like in the related technology are solved, and the technical effect of improving the convenience degree of the test of the optical fiber loss is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a block diagram of a device for testing optical fiber loss according to an embodiment of the present invention;
fig. 2 is a first block diagram of a light beam coupling module according to an embodiment of the present invention;
fig. 3 is a first block diagram of a beam splitting module according to an embodiment of the present invention;
fig. 4 is a block diagram of a second structure of the light beam coupling module according to the embodiment of the present invention;
fig. 5 is a block diagram of a second structure of a beam splitting module according to an embodiment of the present invention;
fig. 6 is a block diagram of a plurality of beam generation modules according to an embodiment of the present invention;
fig. 7 is a block diagram of a plurality of wear test modules according to an embodiment of the present invention;
fig. 8 is a block diagram of a laser tester according to an embodiment of the present invention;
fig. 9 is a block diagram of a signal light tester according to an embodiment of the present invention;
fig. 10 is a block diagram of a temperature testing module according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a device for testing optical fiber loss according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present embodiment, a pump source apparatus is provided, and fig. 1 is a block diagram of a testing apparatus for optical fiber loss according to an embodiment of the present invention; as shown in fig. 1, the apparatus for testing the loss of the optical fiber includes: the optical fiber loss testing device comprises a plurality of light beam generating modules 102, a light beam coupling module 104, a light beam separating module 106 and a plurality of loss testing modules 108, wherein a plurality of input ends of the light beam coupling module 104 are respectively connected with the plurality of light beam generating modules 102 (the light beam generating module 102-1, the light beam generating module 102-2, the … … and the light beam generating module 102-n), an output end of the light beam coupling module 104 is connected with an input end of an optical fiber to be tested, an input end of the light beam separating module 106 is connected with an output end of the optical fiber to be tested, and a plurality of output ends of the light beam separating module 106 are respectively connected with the plurality of loss testing modules 108 (the loss testing module 108-1 and the loss testing module 108-2).
It should be noted that, in fig. 1, the types of the light beams emitted by the multiple light beam generation modules 102 may be determined, but not limited to, according to a test of a fiber loss, for example, taking a test of a loss of the ytterbium-doped fiber due to a photon darkening effect as an example, since a method for characterizing photon darkening attenuation of the ytterbium-doped fiber is that attenuation occurs in power of converting pump light into laser light, and at the same time, additional attenuation occurs in power of signal light, it can be considered that attenuation occurs in output power due to photon darkening of the ytterbium-doped fiber, at this time, the multiple light beam generation modules 102 may include a light beam generation module that emits pump light, and a light beam generation module that emits signal light, and the increase and decrease of the specific light beam generation modules may be determined according to a test requirement of a specific fiber loss.
Similarly, the type of the test parameters of the multiple loss test modules 108 may also be determined, but not limited to, according to the test of the optical fiber loss, for example, in the above test process, the main test is the power loss of the ytterbium-doped optical fiber due to the photon darkening effect, therefore, the multiple loss test modules 108 may include a loss test module that tests the power of the pump light before and after the loss, and a loss test module that tests the power of the signal light before and after the loss, and the increase and decrease of the specific loss test module may be determined according to the test requirement of the specific optical fiber loss.
In one exemplary embodiment, the beam coupling module includes: the optical fiber testing device comprises a wave combiner and a mode field adapter, wherein a plurality of input ends of the wave combiner are respectively connected with a plurality of light beam generators, an output end of the wave combiner is connected with an input end of the mode field adapter, and an output end of the mode field adapter is connected with an input grating of the optical fiber to be tested.
In an alternative implementation, fig. 2 is a block diagram of a first structure of a light beam coupling module according to an embodiment of the present invention; as shown in fig. 2, the input grating may not belong to the optical beam coupling module 104, the combiner 202 may be a wavelength division multiplexer, which includes a plurality of input ends respectively connected to the plurality of optical beam generators 102 (the optical beam generator 102-1, the optical beam generator 102-2, … …, the optical beam generator 102-n), an output end of the combiner 202 is connected to the mode field adapter 204, and an output end of the mode field adapter 204 is connected to the input grating, it should be noted that the input grating may also belong to the optical beam coupling module 104, and the difference between the two structures is whether the optical beam coupling module 104 includes the input grating, that is, the input grating may not be limited to a structure of the optical beam coupling module 104 itself, and may also be a structure that is installed in an actual test process by itself.
In an alternative embodiment, the multiplexer 202 may be a wavelength division multiplexer, where the wavelength division multiplexer is a device that carries multiple wavelength channels on one optical fiber, and can enable light with different wavelengths to be independently transmitted in the same channel optical fiber, multiple light beams are coupled into one optical fiber through an input end WDM, where the WDM is called a coupler or a multiplexer, and an output end WDM is called a demultiplexer or a demultiplexer, where the WDM is used to separate light with different wavelengths.
In an exemplary embodiment, the beam splitting module includes a splitter, wherein an input end of the splitter is connected to the output grating of the optical fiber to be tested, and a plurality of output ends of the splitter are respectively connected to the plurality of loss testing modules.
In an alternative implementation, fig. 3 is a block diagram of a first structure of a beam splitting module according to an embodiment of the present invention; as shown in fig. 3, the output grating may not belong to the beam splitting module 106, the beam splitting module 106 includes a splitter 302, an input end of the splitter 302 is connected to the output grating, and a plurality of output ends of the splitter 302 are connected to a plurality of loss testing modules 108 (loss testing module 108-1, loss testing module 108-2, … …, loss testing module 108-n), it should be noted that the output grating may also but is not limited to belong to the beam coupling module 106, that is, the output grating may but is not limited to be a self-contained structure of the beam splitting module 106, or may be a self-installed structure in an actual testing process.
In one exemplary embodiment, the beam coupling module further comprises the input grating, and the beam splitting module further comprises the output grating.
In an alternative embodiment, the beam coupling module further comprises that the input grating may be, but is not limited to, the following structure: fig. 4 is a structural block diagram ii of a light beam coupling module according to an embodiment of the present invention; as shown in fig. 4, the input grating may belong to the optical beam coupling module 104, the combiner 402 may be a wavelength division multiplexer, and includes a plurality of input ends respectively connected to the plurality of optical beam generators 102 (the optical beam generator 102-1, the optical beam generator 102-2, the optical beam generator … …, and the optical beam generator 102-n), an output end of the combiner 402 is connected to the mode field adapter 404, and an output end of the mode field adapter 404 is connected to the input grating 406.
In an alternative implementation, the beam splitting module further includes the output grating, the beam splitting module 106 may include two structures, and fig. 5 is a block diagram of a second structure of the beam splitting module according to an embodiment of the present invention; as shown in fig. 5, the output grating 502 may belong to the beam splitting module 106, and the demultiplexer 504 may be a wavelength division multiplexer, which includes a plurality of output terminals respectively connected to a plurality of loss testing modules 108 (loss testing module 108-1, loss testing module 108-2, … …, and loss testing module 108-n).
In one exemplary embodiment, the plurality of beam generation modules includes: the laser light generator is connected with the first input end of the light beam coupling module, and the signal light generator is connected with the second input end of the light beam coupling module.
In an alternative implementation, fig. 6 is a block diagram of a plurality of beam generation modules according to an embodiment of the present invention; as shown in fig. 6, the plurality of beam generation modules 102 includes: a laser light generator 602 and a signal light generator 604, wherein the laser light generator 602 is connected to a first input terminal of the optical beam coupling module 104, and the signal light generator 604 is connected to a second input terminal of the optical beam coupling module 104.
In one exemplary embodiment, the plurality of wear test modules comprises: the laser light tester is connected with the first output end of the beam splitting module, and the signal light tester is connected with the second output end of the beam splitting module.
In an alternative implementation, fig. 7 is a block diagram of a plurality of wear test modules according to an embodiment of the present invention; as shown in fig. 7, the plurality of loss testing modules 108 includes a laser tester 702 and a signal light tester 704, wherein the laser tester 702 is connected to a first output terminal of the beam splitting module 106 and the signal light tester 704 is connected to a second output terminal of the beam splitting module 106.
In one exemplary embodiment, the laser tester includes: the optical power meter comprises a first filter and a first power meter, wherein the input end of the first filter is connected with the output end of the beam splitting module, and the output end of the first filter is connected with the first power meter.
In an alternative implementation, fig. 8 is a block diagram of a laser tester according to an embodiment of the present invention; as shown in fig. 8, the laser tester 702 includes: a first filter 802 and a first power meter 804, wherein an input of the first filter 802 is connected to an output of the beam splitting module 106, and an output of the first filter 802 is connected 804 to the first power meter.
In one exemplary embodiment, the signal light tester includes: the input end of the second filter is connected with the output end of the beam splitting module, and the output end of the second filter is connected with the second power meter.
In an alternative embodiment, the second filter may be, but is not limited to, filter out light with a wavelength other than the specified wavelength, for example, the wavelength of the target laser generated in the gain fiber by the pump source emitting 915nm light is 1080nm, and in order to test the power variation of the 1080nm laser, the second filter may be set to pass only 1080nm light.
In an exemplary embodiment, the signal light tester further includes: and the second power meter and the second filter are connected through the coupling mirror group.
In an alternative embodiment, fig. 9 is a block diagram of a signal light tester according to an embodiment of the present invention; as shown in fig. 9, the signal light tester 704 includes: a second filter 902, a coupling mirror group 904 and a second power meter 906, wherein an input end of the second filter 902 is connected with an output end of the beam splitting module 106, and the second power meter 906 and the second filter 902 are connected through the coupling mirror group 904.
In an exemplary embodiment, the apparatus for testing optical fiber loss further includes: the temperature acquisition ends of the temperature sensors are respectively connected with the input grating of the optical fiber to be tested, the gain optical fiber of the optical fiber to be tested and the output grating of the optical fiber to be tested, and the data transmission ends of the temperature sensors are connected with the temperature data processor.
In an alternative implementation, fig. 10 is a block diagram of a temperature testing module according to an embodiment of the present invention; as shown in fig. 10, the apparatus for testing optical fiber loss further includes: the temperature monitoring device comprises a plurality of temperature sensors 109-1 and a temperature data processor 109-2, wherein the temperature acquisition ends of the plurality of temperature sensors 109-1 are respectively connected with an input grating of an optical fiber to be tested, a gain optical fiber of the optical fiber to be tested and an output grating of the optical fiber to be tested, and the data transmission ends of the plurality of temperature sensors 109-1 are connected with the temperature data processor 109-2.
Fig. 11 is a schematic diagram of a test apparatus for optical fiber loss according to an embodiment of the present invention; as shown in fig. 11, the apparatus for testing the loss of an optical fiber includes: the device comprises a pumping pipe (1), an optical isolator (2), a red light diode (3), a Wavelength Division Multiplexer (WDM) (4), a mode field adapter (5), a grating HR (6), a gain optical fiber (7), a grating OC (8), a temperature sensor (9), a data acquisition instrument (10), a Wavelength Division Multiplexer (WDM) (11), a filter 1 (12), a laser power meter (13), a filter 2 (14), a coupling mirror (15) and a red light power meter (16).
The gain fiber may include, but is not limited to: rare earth element-doped fibers such as erbium-doped fibers, thulium-doped fibers, and neodymium-doped fibers, and the following examples will be described with the gain fiber being an ytterbium-doped fiber as an example.
In this embodiment, the pump source (1) with a wavelength of 915nm and the red diode (3) with a wavelength of 650nm are coupled into one optical fiber through the wavelength division multiplexer WDM (4), and it should be noted that, according to the characteristics of the absorption spectrum of the ytterbium-doped optical fiber, the pump source may optionally have wavelengths of 915nm, 976nm, 808nm, 888nm, etc., and also the indication light may optionally have wavelengths of 650nm and 632nm. Connect a mode field adapter (5) behind the wavelength division multiplexer, its effect is with the light adaptation of different mode fields and the transmission of each other noninterference in optic fibre, grating HR (6) and mixing ytterbium optic fibre (7) and grating OC (8) form the laser cavity resonator, the pump light that pump source (1) transmitted gets into through grating HR (6), most is absorbed by mixing ytterbium optic fibre (7), and it is 1080 nm's laser to launch the wavelength, the laser forms the oscillation in the cavity resonator and exports from grating OC (8), the reflectivity of grating high-reflection end (6) is greater than 99%, but still there is some laser to leak reverse transmission through high-reflection end. Therefore, an optical isolator (2) is welded behind the pump tube to prevent the laser from being transmitted forward and causing damage. After laser and signal indication light are output from a grating OC (8) at the same time, laser with the wavelength of 1080nm and signal light with the wavelength of 650nm are separated through another wavelength division multiplexer WDM (11) to form two-path transmission, then different filters are used for filtering aiming at different wavelengths, the filter 1 (12) can only pass through the light with the wavelength of 1080nm, the filter 2 (14) can only pass through the light with the wavelength of 650nm, the purpose is to filter interference of other light on a result, the laser with the wavelength of 1080nm reaches a laser power meter (13), and because the power of the indication signal light is in a milliwatt level, in order to eliminate energy loss, a coupling mirror (15) is added to couple 650nm light into a red light power meter. Finally, the gradual attenuation of the output energy acts on the grating HR, the ytterbium-doped optical fiber and the grating OC of the resonant cavity in the form of heat, so that a temperature sensor (9) is adhered to the three devices and is monitored by a data acquisition instrument in real time (10).
Finally, two output power values P0 and Pt within a period of time delta t can be recorded, and then the formula is carried out:
wherein the content of the first and second substances,
the unit is dB, and the loss of the ytterbium-doped fiber and the additional loss of the corresponding signal light can be calculated respectively through calculation.
Through the embodiment, the pumping light and the signal light are coupled into one optical fiber by utilizing the two forward and reverse wavelength division multiplexers, the output end separates the laser from the signal light, the purpose of simultaneously monitoring the laser loss and the additional loss of the signal light is achieved, and the temperature sensors are adhered to the fiber bragg grating in the laser pumping cavity in a high-reflection mode, the ytterbium-doped optical fiber and the grating in a low-reflection mode, so that the monitoring of the linear correlation of the output power loss and the temperature rise is realized, the loss of the gain optical fiber is reflected more intuitively and is finally converted into the heat load of the optical fiber body, compared with the test structure in the prior art, the structure is simpler, the operation is simple and convenient, optical devices in the laser structure are reduced, a plurality of optical fiber fusion joints are reduced, and the test efficiency is greatly improved.
Through the embodiment, the light beams generated by the light beam generating modules are coupled into the optical fiber to be tested through the light beam coupling module, the light beams experience a loss process in the optical fiber to be tested under the condition that independent transmission of the light beams is not interfered with each other, then the light beams transmitted in the same optical fiber are separated through the light beam separating module, and finally the loss condition of the optical fiber to be tested under the respective action of the light beams is synchronously tested through the loss testing modules. By adopting the technical scheme, the problems that the convenience degree of the test of the optical fiber loss is low and the like in the related technology are solved, and the technical effect of improving the convenience degree of the test of the optical fiber loss is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical fiber loss testing apparatus, comprising: a plurality of beam generation modules, a beam coupling module, a beam splitting module, a plurality of loss testing modules, wherein,
the input ends of the light beam coupling module are respectively connected with the light beam generating modules, the output end of the light beam coupling module is connected with the input end of an optical fiber to be tested, the input end of the light beam separating module is connected with the output end of the optical fiber to be tested, and the output ends of the light beam separating module are respectively connected with the loss testing modules.
2. The apparatus for testing optical fiber loss according to claim 1, wherein the optical beam coupling module comprises: a combiner and a mode field adapter, wherein,
and a plurality of input ends of the wave combiner are respectively connected with the plurality of light beam generators, an output end of the wave combiner is connected with an input end of the mode field adapter, and an output end of the mode field adapter is connected with the input grating of the optical fiber to be tested.
3. The apparatus of claim 2, wherein the beam splitting module comprises a splitter, wherein an input end of the splitter is connected to the output grating of the optical fiber to be tested, and a plurality of output ends of the splitter are respectively connected to the loss testing modules.
4. The apparatus of claim 3, wherein the beam coupling module further comprises the input grating, and the beam splitting module further comprises the output grating.
5. The apparatus for testing optical fiber loss according to claim 1, wherein the plurality of light beam generating modules comprises: a laser light generator and a signal light generator, wherein,
the laser generator is connected with a first input end of the light beam coupling module, and the signal light generator is connected with a second input end of the light beam coupling module.
6. The apparatus for testing optical fiber loss according to claim 5, wherein said plurality of loss testing modules comprises: a laser tester and a signal light tester, wherein,
the laser tester is connected with the first output end of the beam splitting module, and the signal light tester is connected with the second output end of the beam splitting module.
7. The apparatus for testing optical fiber loss according to claim 6, wherein the laser tester comprises: a first filter and a first power meter, wherein,
the input end of the first filter is connected with the output end of the beam splitting module, and the output end of the first filter is connected with the first power meter.
8. The apparatus for testing optical fiber loss according to claim 6, wherein the signal light tester comprises: a second filter and a second power meter, wherein,
the input end of the second filter is connected with the output end of the beam splitting module, and the output end of the second filter is connected with the second power meter.
9. The apparatus for testing optical fiber loss according to claim 8, wherein the signal light tester further comprises: a coupling lens group, wherein,
the second power meter is connected with the second filter through the coupling mirror group.
10. The apparatus for testing optical fiber loss according to any one of claims 1 to 9, further comprising: a plurality of temperature sensors and a temperature data processor, wherein,
the temperature acquisition ends of the temperature sensors are respectively connected with the input grating of the optical fiber to be tested, the gain optical fiber of the optical fiber to be tested and the output grating of the optical fiber to be tested, and the data transmission ends of the temperature sensors are connected with the temperature data processor.
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