CN215374431U - Testing device - Google Patents
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- CN215374431U CN215374431U CN202120811553.0U CN202120811553U CN215374431U CN 215374431 U CN215374431 U CN 215374431U CN 202120811553 U CN202120811553 U CN 202120811553U CN 215374431 U CN215374431 U CN 215374431U
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Abstract
The embodiment of the application provides a testing device, which comprises a first optical device, a second optical device, a first mode field adapter and a second mode field adapter, wherein the input end of the first mode field adapter is connected with the output end of the first optical device through a transmission optical fiber; and the output end of the first mode field adapter and the input end of the second mode field adapter are used for welding a gain optical fiber device to be tested. The technical scheme provided by the embodiment of the application improves the testing efficiency of the gain optical fiber device.
Description
Technical Field
The embodiment of the application relates to the field of laser devices, in particular to a testing device.
Background
The optical fiber laser is a laser using a rare earth element doped gain optical fiber as a gain medium, and the output effect of the optical fiber laser is affected by the performance of the gain optical fiber, so that the performance of the used gain optical fiber needs to be tested in the stages of designing, producing and the like of the optical fiber laser.
When a conventional testing device is used for testing a gain optical fiber, the gain optical fiber to be tested is generally accessed into a transmission optical fiber of the testing device, so that test light can be transmitted in the gain optical fiber, the gain optical fiber processes the test light, and the performance of the gain optical fiber is tested by comparing the output test light of the gain optical fiber with the input test light of the gain optical fiber. When the gain fiber to be tested is connected to the transmission fiber in the testing device, the core diameter and the cladding diameter of the transmission fiber need to be kept the same as those of the gain fiber, otherwise, higher fusion damage is caused. Therefore, the conventional testing device can only test one gain fiber with a fiber core diameter and a cladding diameter, and if the gain fibers with different fiber core diameters and cladding diameters are tested, the testing device needs to be replaced, so that the testing efficiency is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a testing device, which is used for solving the problem that the testing efficiency of a gain optical fiber is lower in the prior art.
In a first aspect, an embodiment of the present application provides a testing apparatus, which includes a first optical device and a second optical device, a first mode field adapter whose input end is connected to an output end of the first optical device through a transmission optical fiber, and a second mode field adapter whose output end is connected to an input end of the second optical device through a transmission optical fiber;
and the output end of the first mode field adapter and the input end of the second mode field adapter are used for welding a gain optical fiber device to be tested.
In the embodiment of the application, because mode field adapter has the effect and the characteristic of the loss when reducing the optical fiber of different mode field diameters and numerical aperture and carrying out the butt fusion, can be used for reducing the transmission fiber who has different fibre core diameters and cladding diameter and the butt fusion loss of gain fiber that awaits measuring when the butt fusion, then through inserting two mode field adapters in testing arrangement, can realize utilizing same testing arrangement to the multiple test that has the gain fiber that awaits measuring of different fibre core diameters and cladding diameter, the problem that needs to change testing arrangement among the traditional scheme has been solved, the efficiency of software testing of gain fiber has been improved.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram illustrating an embodiment of a testing apparatus provided herein;
FIG. 2 is a schematic diagram illustrating another embodiment of a testing apparatus provided herein;
fig. 3 is a schematic structural diagram of another embodiment of a testing apparatus provided in the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In some of the structures described in the specification and claims of this application and in the above-identified drawings, a plurality of structural elements are included in a particular order, and the numbers of structural elements such as 101, 102, etc. are merely used to distinguish between the various structural elements. It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different structural components, etc., and do not represent the order, nor limit the types of "first" and "second" to be different.
The embodiment of the application can be applied to a testing device for testing optical fibers, taking the example that the optical fiber to be tested is a gain optical fiber in an optical fiber laser, the optical fiber laser is a laser using a gain optical fiber doped with rare earth elements as a gain medium, and the output effect of the optical fiber laser is influenced by the performance of the gain optical fiber, so that the performance of the used gain optical fiber is tested in the stages of designing, producing and the like of the optical fiber laser.
When a conventional testing device is used for testing a gain optical fiber, the gain optical fiber to be tested is usually connected into a transmission optical fiber of the testing device, so that test light can be transmitted in the gain optical fiber to be tested, the gain optical fiber to be tested can process the test light, and the performance of the gain optical fiber to be tested is tested by comparing the output test light and the input test light of the gain optical fiber to be tested. When the gain fiber to be tested is connected to the transmission fiber in the testing device, the core diameter and the cladding diameter of the transmission fiber need to be kept the same as those of the gain fiber to be tested, otherwise, higher fusion damage is caused. Therefore, the conventional testing device can only test one gain fiber to be tested with different fiber core diameters and cladding diameters, and if the gain fiber to be tested with different fiber core diameters and cladding diameters is tested, the testing device needs to be replaced, so that the testing efficiency is low.
Therefore, in order to improve the testing efficiency of the gain fiber to be tested, the inventor thinks that a Mode Field Adapter (MFA) has the function and characteristic of reducing the loss when the fibers with different Mode Field diameters and numerical apertures are welded, and can be used for reducing the welding loss when the transmission fiber and the gain fiber to be tested with different core diameters and cladding diameters are welded. Therefore, the inventor proposes a technical scheme of the application, namely a testing device which comprises a first optical device and a second optical device, a first mode field adapter of which the input end is connected with the output end of the first optical device through a transmission optical fiber, and a second mode field adapter of which the output end is connected with the input end of the second optical device through a transmission optical fiber; and the output end of the first mode field adapter and the input end of the second mode field adapter are used for welding a gain optical fiber device to be tested.
By connecting the two mode field adapters into the testing device, the testing of various gain optical fibers to be tested with different fiber core diameters and cladding diameters by using the same testing device can be realized, the problem that the testing device needs to be replaced in the traditional scheme is solved, and the testing efficiency of the gain optical fibers is improved.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, there is shown a schematic structural diagram of a testing apparatus in an embodiment, which includes a first optical device 101, a second optical device 102, a first mode field adapter 103 whose input end is connected to the output end of the first optical device through a transmission fiber, and a second mode field adapter 104 whose output end is connected to the input end of the second optical device through a transmission fiber.
The output end of the first mode field adapter 103 and the input end of the second mode field adapter 104 are used for welding the gain fiber device 105 to be tested.
In the embodiment of the present application, the testing apparatus may be used to test an optical fiber, and taking a gain optical fiber in an optical fiber laser as an example, the output effect of the optical fiber laser is affected by the performance of the gain optical fiber, so that performance tests, such as a conversion efficiency test, are performed on the gain optical fiber in the stages of designing, producing, and the like of the optical fiber laser. When the gain optical fiber is tested, test light can be input from one end of the gain optical fiber to be tested, and output from the other end of the gain optical fiber to be tested, so that the test light is transmitted in the gain optical fiber to be tested, and the gain optical fiber to be tested can process the test light, for example, the gain optical fiber to be tested can amplify signal light and the like. The performance of the gain fiber to be tested, such as conversion efficiency, is tested by comparing the test optical parameters output by the gain fiber to be tested with the test optical parameters input into the gain fiber to be tested.
Specifically, the first optical device 101 in the testing apparatus may be used as a generating device of the testing light, the testing light generated by the first optical device 101 is first transmitted along the transmission optical fiber, then transmitted to one end of the gain optical fiber device 105 to be tested, transmitted in the gain optical fiber device 105 to be tested, processed by the gain optical fiber device to be tested, output from the other end of the gain optical fiber device 105 to be tested, and transmitted along the transmission optical fiber to the second optical device 102. The second optical device 102 may be used as a test device for testing light, and tests the test light output by the gain fiber device to be tested, thereby obtaining the performance of the gain fiber device to be tested.
In practical applications, the gain optical fiber device to be measured may include a rare earth doped optical fiber, such as an ytterbium doped optical fiber, a thulium doped optical fiber, or a holmium doped optical fiber. The rare-earth-doped gain fiber may further include different types of gain fibers, such as different core diameters and different cladding diameters. In general, an optical fiber may be composed of a protective layer, a cladding, and a core, all of which are cylindrical, where the core diameter refers to the diameter of a tangent circle of the cylindrical core, and the cladding diameter refers to the diameter of a tangent circle of the cylindrical cladding. Taking the ytterbium-doped fiber as an example, the ytterbium-doped fiber may include a ytterbium-doped fiber with a core diameter of 25um (micrometer) and a cladding diameter of 400um (micrometer), which may be referred to as 25/400 ytterbium-doped fiber for short, and a ytterbium-doped fiber with a core diameter of 20um and a cladding diameter of 400um, which may be referred to as 20/400 ytterbium-doped fiber for short.
The mode field diameter and numerical aperture are also different for fibers of different core and cladding diameters. The Mode Field Diameter (MFD) can be used to represent the distribution state of fundamental Mode light in the core region of a single-Mode fiber. The fundamental mode has a maximum intensity at the axis of the core region and gradually decreases with increasing distance from the axis. The mode field diameter is generally defined as the 1/e reduction in intensity to the maximum intensity at the axis2The maximum distance between two points of each point. Numerical aperture may be used to indicate the ability of the fiber end face to receive light. Mode field diameter and numerical apertureWhen different optical fibers are subjected to fusion welding, the transition from a large mode field to a small mode field or from the small mode field to the large mode field is formed at the fusion point, so that higher fusion welding loss is generated. Therefore, in order to reduce the fusion loss generated when different types of optical fibers are directly fused, a mode field adapter can be connected between the transmission optical fiber and the gain optical fiber device to be tested. A Mode Field Adapter (MFA) is used as an optical device, and can reduce loss when two optical fibers with different Mode Field diameters and numerical apertures are welded, so that a base film signal obtains maximum transmittance at a melting point.
In this embodiment, the first mode field adapter 103 and the second mode field adapter 104 can be connected. Wherein, the input end of the first mode field adapter 103 is connected with the output end of the first optical device 101 through a transmission optical fiber, and the output end of the second mode field adapter 104 is connected with the input end of the second optical device 102 through a transmission optical fiber.
At this time, the test light generated by the first optical device 101 is transmitted along the transmission optical fiber, then transmitted to one end of the gain optical fiber device 105 to be tested via the first mode field adapter 103, transmitted in the gain optical fiber device 105 to be tested, processed by the gain optical fiber device to be tested, output from the other end of the gain optical fiber device 105 to be tested, transmitted to the transmission optical fiber via the second mode field adapter 104, and transmitted to the second optical device 102 along the transmission optical fiber.
Because the mode field adapter can reduce the fusion loss generated when different types of optical fibers are fused, the diameter of the fiber core of the gain optical fiber device to be tested can be the same as or different from that of the fiber core of the transmission optical fiber, and the diameter of the cladding of the gain optical fiber device to be tested can be the same as or different from that of the cladding of the transmission optical fiber.
When the core diameter of the gain fiber device to be tested is different from that of the transmission fiber, as an optional embodiment, the core diameter of the gain fiber device to be tested can be smaller than that of the transmission fiber, the core diameter of the transmission fiber is 25um, the cladding diameter is 400um, the core diameter of the gain fiber device to be tested can be 20um, the cladding diameter can be 400um, at the moment, along the transmission direction of test light, the fusion points at two ends of the transmission fiber and the gain fiber device to be tested can form a large mode field to a small mode field, and the transition from the small mode field to the large mode field generates fusion loss. At the moment, the first mode field adapter is realized as a forward mode field adapter, the second mode field adapter is realized as a reverse mode field adapter, the fusion loss at a fusion point is reduced, and the compatible test of the gain optical fiber device to be tested with the smaller fiber core diameter is realized.
As another optional embodiment, the diameter of the core of the gain fiber device to be tested may be larger than that of the transmission fiber, taking the diameter of the core of the transmission fiber as 20um and the diameter of the cladding as 400um as an example, the diameter of the core of the gain fiber device to be tested may be 25um and the diameter of the cladding may be 400um, at this time, the welding points at the two ends may form a small mode field to a large mode field, and the transition from the large mode field to the small mode field generates welding loss. At the moment, the first mode field adapter is realized as a reverse mode field adapter, the second mode field adapter is realized as a forward mode field adapter, the fusion loss at a fusion point is reduced, and the compatible test of the gain optical fiber device to be tested with the larger fiber core diameter is realized.
Of course, the diameter of the fiber core of the gain fiber device to be measured can also be the same as that of the transmission fiber, and no fusion loss exists at the moment. If the diameters of the fiber cores of the transmission fiber and the gain fiber device to be tested are both 25um, the diameters of the cladding are both 400um, or the diameters of the fiber cores of the transmission fiber and the gain fiber device to be tested are both 20um, the diameters of the cladding are both 400um, and the like. It can be understood that the gain optical fiber device to be measured herein uses an ytterbium-doped optical fiber, and may further include a thulium-doped optical fiber, a holmium-doped optical fiber, and the like in practical applications, which is not particularly limited in this embodiment.
In the embodiment of the application, because mode field adapter has the effect and the characteristic of the loss when reducing the optical fiber of different mode field diameters and numerical aperture and carrying out the butt fusion, can be used for reducing the transmission fiber who has different fibre core diameters and cladding diameter and the butt fusion loss of gain fiber that awaits measuring when the butt fusion, then through inserting two mode field adapters in testing arrangement, can realize utilizing same testing arrangement to the multiple test that has the gain fiber that awaits measuring of different fibre core diameters and cladding diameter, the problem that needs to change testing arrangement among the traditional scheme has been solved, the efficiency of software testing of gain fiber has been improved.
In practical application, the mode field adapter and the gain fiber device to be tested are welded through the optical fiber jumper. Thus, in some embodiments, the output end of the first mode field adapter 103 may be provided with at least one first optical fiber jumper, and the input end of the second mode field adapter 104 may be provided with at least one second optical fiber jumper.
The gain fiber device under test 105 can be fused to the output end of the first mode field adapter 103 through a first fiber jumper matched with the gain fiber device under test, and can be fused to the input end of the second mode field adapter 104 through a second fiber jumper matched with the gain fiber device under test.
One or more first optical fiber jumpers may be disposed at the output end of the first mode field adapter 103, and one or more second optical fiber jumpers may be disposed at the input end of the second mode field adapter 104.
As an alternative embodiment, the output end of the first mode field adapter 103 may be provided with a first optical fiber jumper, the input end of the second mode field adapter 104 may also be provided with a second optical fiber jumper, the fiber core diameter and the cladding diameter of the first optical fiber jumper and the second optical fiber jumper are the same as the fiber core diameter and the cladding diameter of the gain optical fiber device to be tested, and then the first optical fiber jumper and the second optical fiber jumper are both matched with the gain optical fiber device to be tested. At the moment, the gain fiber device to be tested can be welded with the output end of the first mode field adapter through the first fiber jumper, and is welded with the input end of the second mode field adapter through the second fiber jumper.
As another alternative, the output end of the first mode field adapter 103 may be provided with a plurality of first optical fiber jumpers, which differ in core diameter and/or cladding diameter. Specifically, the diameters of the fiber cores are different, and the diameters of the cladding layers can be the same; or the diameters of the cladding layers are different, and the diameters of the fiber cores can be the same; or the core diameter and the cladding diameter are different, and the like, and the setting can be performed according to the actual situation, and is not limited specifically here. Correspondingly, the input end of the second mode field adapter 104 may also be provided with a plurality of second optical fiber jumpers, the number of the second optical fiber jumpers may be the same as the number of the first optical fiber jumpers, and the fiber core diameters and/or the cladding diameters of the plurality of second optical fiber jumpers are different, which is not described herein again.
At this time, the gain fiber device 105 to be tested may be fusion-spliced with the output end of the first mode field adapter 103 through a first fiber jumper whose core diameter and cladding diameter are the same as themselves, and fusion-spliced with the input end of the second mode field adapter 104 through a second fiber jumper whose core diameter and cladding diameter are the same as themselves. For example, the output end of the first mode field adapter is provided with a fiber core with a diameter of 20um, the cladding diameter is 400um and the fiber core diameter is 25um, the cladding diameter is two first optical fiber jumpers of 400um, which corresponds to the first optical fiber jumpers, the input end of the second mode field adapter is also provided with two corresponding second optical fiber jumpers, if the gain optical fiber device to be measured is 25/400 ytterbium-doped optical fiber, the first optical fiber jumpers of the core diameter of 25um and the cladding diameter of 400um can be fused with the output end of the first mode field adapter, and the second optical fiber jumpers can be fused with the input end of the second mode field adapter.
In practical application, the gain fiber device to be tested may include a gain fiber to be tested, and a first grating and a second grating respectively welded to two ends of the gain fiber to be tested and matching with the type of the gain fiber to be tested. Specifically, the gain optical fiber device to be tested is welded with the output end of the first mode field adapter through the first optical fiber jumper wire matched with the gain optical fiber device to be tested, the first grating is welded with the output end of the first mode field adapter through the first optical fiber jumper wire matched with the first grating, correspondingly, the gain optical fiber device to be tested is welded with the input end of the second mode field adapter through the second optical fiber jumper wire matched with the gain optical fiber device to be tested, and the second grating is welded with the input end of the second mode field adapter through the second optical fiber jumper wire matched with the second grating.
Fig. 2 shows a schematic structural diagram of a testing device in a further embodiment. In the testing apparatus, the gain fiber device 105 to be tested includes a gain fiber 1051 to be tested, and a first grating 1052 and a second grating 1053 respectively welded to two ends of the gain fiber 1051 to be tested. The first optical device 101 may include a signal light input device 1011, a first pump tube 1013, an optical isolator 1012 whose input terminal is connected to an output terminal of the signal light input device 1011 through a transmission fiber, and a first beam combiner 1014 whose input terminal is connected to an output terminal of the first pump tube 1013 and an output terminal of the optical isolator 1012 through a transmission fiber, respectively. The first grating may be implemented as a high reflective grating, and the second grating may be implemented as a low reflective grating.
Wherein, the output end of the first beam combiner 1014 is connected with the input end of the first mode field adapter 103 through a transmission fiber.
The signal light input device 1011 may be configured to generate signal light, and the signal light may be transmitted to the gain fiber 1051 to be tested. The first pump tube 1013 may be configured to generate pump light, the pump light is transmitted to the gain fiber 1051 to be tested through the first beam combiner 1014 together with the signal light, and the gain fiber 1051 to be tested absorbs the pump light, so that the signal light may be amplified under the action of the pump light. In practical application, the first pump tube 1013 can generate 915nm pump light, and the gain fiber 1051 to be measured absorbs the pump light, amplifies the signal light, and can output 1080nm laser.
In order to prevent the forward laser light of the first beam combiner 1014 from being reflected back to the signal light input device due to the reversibility of the laser light and causing damage to the signal light input device, the first optical device 101 may further include an optical isolator 1012. The input end of the optical isolator 1012 is connected with the output end of the signal light input device 1011, and the output end of the optical isolator 1012 is connected with the input end of the first beam combiner 1014, so that the optical isolator can be used for isolating laser reflected back to the signal light input device, and the normal work of the testing device is ensured.
The pump light and the signal light output by the first beam combiner 1014 are transmitted along the transmission fiber, and then transmitted into the gain fiber 1051 to be tested through the first mode field adapter 103. The gain fiber 1051 to be tested absorbs the pump light, amplifies the signal light, and transmits the light output from the gain fiber 1051 to be tested to the transmission fiber through the second mode field adapter 104, and then to the second optical device 102 along the transmission fiber.
The second optical device 102 may obtain the relevant parameters of the laser output through the gain fiber 1051 to be measured, and perform comparison calculation by combining the relevant parameters of the laser input into the gain fiber 1051 to be measured, so as to obtain the performance parameters of the gain fiber 1051 to be measured. For example, the second optical device 102 may obtain the laser power output by the gain fiber 1051 to be measured and the power of the first pumping tube 1013, and calculate the ratio of the power of the first pumping tube to the output laser power, so as to obtain the conversion efficiency of the gain fiber 1051 to be measured.
In the above embodiment, the pump light and the signal light are transmitted to the gain fiber to be measured in the same direction, and the first pump tube 1013 is implemented as a forward pumping structure, which is simple and easy to implement.
In practical applications, there may be other implementations besides the above-described forward pumping structure. Fig. 3 shows a schematic structural diagram of a testing device in a further embodiment. In the testing apparatus, the second optical device 102 may include a testing device 1021, a second pump tube 1024, a fiber laser output head 1022 whose output end is connected to the testing device 1021 through a transmission fiber, a mode stripper 1023 whose output end is connected to an input end of the fiber laser output head 1022 through a transmission fiber, and a second beam combiner 1025 whose input end is connected to an output end of the second pump tube 1024 and an input end of the mode stripper 1023 through transmission fibers, respectively.
Wherein, the output end of the second beam combiner 1025 is connected with the output end of the second mode field adapter 104 through a transmission fiber.
The second pump tube 1024 is also used to generate pump light, which is transmitted into the gain fiber 1051 to be tested in the direction opposite to the signal light through the second beam combiner 1025 and is transmitted in the opposite direction to the signal light in the gain fiber 1051 to be tested. At this time, the second pumping tube 1024 may be implemented as a reverse pumping structure, and when the signal light is amplified to be strong, the pumping light is also strong, the gain fiber to be measured is not easily saturated by the gain, and the output power of the gain fiber to be measured can be improved.
In this embodiment, the first pumping tube 1013 and the second pumping tube 1024 form a bidirectional pumping structure, which has the advantages of a co-directional pumping structure and a counter-directional pumping structure, so that the pumping light is uniformly distributed in the gain fiber to be measured, thereby improving the output power of the gain fiber to be measured.
In practical application, after the gain fiber to be measured absorbs the pump light, a part of the pump light transmitted by the cladding will not be completely absorbed by the gain fiber to be measured, and at this time, noise will be generated. At this time, the mode stripper 1023 may strip out the part of the pump light, so that the laser output to the test device 1021 is the laser excited by the gain fiber to be tested.
The laser output from the stripper 1023 is transmitted along a transmission fiber to a fiber laser output head 1022, which can transmit the laser to a test device 1021. The test device 1021 can obtain the relevant parameters of the laser output by the gain fiber 1051 to be tested, and perform comparison calculation by combining the relevant parameters of the laser input into the gain fiber 1051 to be tested, so as to obtain the performance parameters of the gain fiber 1051 to be tested. For example, the testing device 1021 may obtain the laser power output through the gain fiber 1051 to be tested, and the power of the first pumping tube and the second pumping tube, wherein the power of the first pumping tube and the power of the second pumping tube may be the same. The ratio of the power of the pumping tube to the output laser power is calculated, and the conversion efficiency of the gain fiber 1051 to be measured can be obtained.
In this embodiment, through inserting two mode field adapters in testing arrangement, can realize utilizing same testing arrangement to the test of multiple gain optic fibre that awaits measuring that has different fibre core diameters and cladding diameter, solve the problem that needs to change testing arrangement in the traditional scheme, improved the efficiency of software testing of gain optic fibre. Meanwhile, the bidirectional pumping structure realized in the testing device can ensure that the pumping light is uniformly distributed in the gain fiber to be tested, the gain is uniformly distributed in the fiber, and the output power of the gain fiber to be tested is improved.
In practical application, the testing device can also be used for replacing different optical devices and testing the performance of other optical devices. For example, the signal light input device 1011 in the first optical device 101 may be disconnected from the fusion splice, at this time, the pump light is transmitted to the testing device 1021 in the second optical device 102 through the first beam combiner 1014, and the testing device 1021 may perform comparison calculation based on the output laser power and the power of the pump tube to obtain the insertion loss of the first beam combiner, perform a test on the performance of the first beam combiner, and the like, and may be set according to actual applications, which is not described herein again.
It is clear to a person skilled in the art that the above described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A test device is characterized by comprising a first optical device, a second optical device, a first mode field adapter of which the input end is connected with the output end of the first optical device through a transmission optical fiber, and a second mode field adapter of which the output end is connected with the input end of the second optical device through the transmission optical fiber;
and the output end of the first mode field adapter and the input end of the second mode field adapter are used for welding a gain optical fiber device to be tested.
2. The test apparatus according to claim 1, wherein the core diameter of the gain fiber device under test is the same as or different from the core diameter of the transmission fiber, and the cladding diameter of the gain fiber device under test is the same as or different from the cladding diameter of the transmission fiber.
3. The test device of claim 1, wherein the output end of the first mode field adapter is provided with at least one first optical fiber jumper, and the input end of the second mode field adapter is provided with at least one second optical fiber jumper;
the gain optical fiber device to be tested is welded with the output end of the first mode field adapter through a first optical fiber jumper wire matched with the gain optical fiber device to be tested, and is welded with the input end of the second mode field adapter through a second optical fiber jumper wire matched with the gain optical fiber device to be tested.
4. The testing device according to claim 3, wherein the output end of the first mode field adapter is provided with a plurality of first optical fiber jumpers, the first optical fiber jumpers having different core diameters and/or cladding diameters;
and the output end of the second mode field adapter is provided with a plurality of second optical fiber jumpers, and the diameters of fiber cores and/or the diameters of cladding layers of the plurality of second optical fiber jumpers are different.
5. The test device according to claim 4, wherein the device of gain fiber under test comprises a gain fiber under test, and a first grating and a second grating respectively welded to two ends of the gain fiber under test;
the first grating is welded with the output end of the first mode field adapter through a first optical fiber jumper wire matched with the first grating, and the second grating is welded with the input end of the second mode field adapter through a second optical fiber jumper wire matched with the second grating.
6. The testing apparatus of claim 1, wherein the first optical device comprises a signal light input device, a first pump tube, an optical isolator having an input end connected to an output end of the signal light input device through a transmission fiber, and a first beam combiner having an input end connected to an output end of the first pump tube and an output end of the optical isolator through transmission fibers, respectively;
and the output end of the first beam combiner is connected with the input end of the first mode field adapter through a transmission optical fiber.
7. The test device according to claim 1, wherein the second optical device comprises a test device, a second pump tube, a fiber laser output head with an output end connected with an input end of the test device through a transmission fiber, a mode stripper with an output end connected with an input end of the fiber laser output head through a transmission fiber, and a second beam combiner with an input end connected with an output end of the second pump tube and an input end of the mode stripper through transmission fibers;
and the output end of the second beam combiner is connected with the output end of the second mode field adapter through a transmission optical fiber.
8. The testing device of claim 5, wherein the gain fiber under test comprises an ytterbium-doped fiber under test.
9. The test apparatus of claim 8, wherein the transmission fiber has a core diameter of 20 microns and a cladding diameter of 400 microns;
the diameter of a fiber core of the gain fiber to be measured is 20 microns, the diameter of a cladding is 400 microns, or the diameter of the fiber core is 25 microns, and the diameter of the cladding is 400 microns.
10. The test apparatus of claim 8, wherein the transmission fiber has a core diameter of 25 microns and a cladding diameter of 400 microns;
the diameter of a fiber core of the gain fiber to be measured is 20 microns, the diameter of a cladding is 400 microns, or the diameter of the fiber core is 25 microns, and the diameter of the cladding is 400 microns.
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