CN218121346U - Testing device for extinction ratio and receiving angle of polarization maintaining optical fiber - Google Patents
Testing device for extinction ratio and receiving angle of polarization maintaining optical fiber Download PDFInfo
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- CN218121346U CN218121346U CN202221797714.6U CN202221797714U CN218121346U CN 218121346 U CN218121346 U CN 218121346U CN 202221797714 U CN202221797714 U CN 202221797714U CN 218121346 U CN218121346 U CN 218121346U
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Abstract
The utility model discloses a testing device for extinction ratio and receiving angle of polarization maintaining optical fiber, which comprises an analyzer, a power meter, a polarization analyzer and three adjusting frames arranged at intervals; the three adjusting frames are respectively: the first adjusting frame is fixedly provided with a first collimator and a first adjusting assembly, and one end of the first collimator is connected with the light source optical fiber; the second adjusting frame is fixed with a polarizer; and the third adjusting frame is fixedly provided with a second collimator and a second adjusting assembly, one end of the second collimator is connected with one end of the polarization maintaining optical fiber, and the other end of the polarization maintaining optical fiber is connected with the third collimator. The utility model discloses a test light path is simple, and it is convenient to adjust, and can obtain accurate test result.
Description
Technical Field
The utility model discloses be applied to the transmission field of polarized light, specifically be a testing arrangement of polarization maintaining fiber extinction ratio and acceptance angle.
Background
With the informatization of society, the optical fiber technology is gradually deepening into various fields of society, and the special optical fiber has extremely wide application in various fields as the future development direction of the optical fiber technology. Especially, the polarization maintaining optical fiber which can be used for optical fiber sensing has stronger polarization maintaining capability to linearly polarized light and has good compatibility with common single mode optical fiber, so that the polarization maintaining optical fiber is more and more widely applied to optical fiber communication and optical fiber sensing systems. Polarization maintaining optical fibers are typically used in applications that are sensitive to the polarization state, such as interferometers, or lasers, or in the connection between a light source and an external modulator, etc.
The mode of realizing the polarization maintaining principle of the polarization maintaining optical fiber is as follows: by aligning the polarization direction of polarized light with one axis, the polarization component divided into the other axis is small, thereby maintaining the polarization state of transmitted light. At this time, an extinction ratio parameter is introduced to reflect the degree of the polarization state of the optical fiber. When the polarization direction is aligned with one of the fast and slow axes, two orthogonal polarization modes are generated through the components, and the ratio of the polarization component along the original direction axial direction to the polarization component in the vertical direction is the extinction ratio. The larger the extinction ratio is, the stronger the polarization maintaining capability of the polarization maintaining optical fiber is.
However, in the using process, the polarization direction of the incident light may not be completely aligned with the fast axis or the slow axis of the optical fiber, and when the included angle between the polarization direction of the incident polarized light and the fast axis or the slow axis of the optical fiber is θ, the extinction ratio of the emergent polarized light is greater than 20dB, which is defined as the receiving angle of the polarization-maintaining optical fiber.
Disclosure of Invention
For overcoming the deficiencies of the prior art, the utility model provides a testing arrangement of polarization maintaining fiber extinction ratio and acceptance angle for solve above-mentioned technical problem.
The utility model discloses a realize through following technical scheme:
a testing device for extinction ratio and receiving angle of polarization maintaining optical fiber comprises an analyzer, a power meter, a polarization analyzer and three adjusting frames arranged at intervals; wherein, three the alignment jig is respectively: the first adjusting frame is fixedly provided with a first collimator and a first adjusting assembly, and one end of the first collimator is connected with a light source optical fiber; the second adjusting frame is fixed with a polarizer; and the third adjusting frame is fixedly provided with a second collimator and a second adjusting assembly, one end of the second collimator is connected with one end of the polarization maintaining optical fiber, and the other end of the polarization maintaining optical fiber is connected with the third collimator.
According to the technical scheme, light emitted by the light source can vertically enter the polarizer through the first collimator through the first adjusting frame, the light of the first collimator and the light of the second collimator coincide through the cooperation of the first adjusting frame and the third adjusting frame, the rotation angle of the polarizer is adjusted through the second adjusting frame, and the polarization analyzer is matched, so that the light emitted by the polarization maintaining optical fiber is linearly polarized light, and meanwhile, the extinction ratio and the receiving angle measurement are realized through the angular rotation of the polarizer and the cooperation of the polarization analyzer and the power meter.
As a further technical scheme, light inlets of the analyzer, the power meter and the polarization analyzer are matched with a light outlet of a third collimator. Before testing the extinction ratio and the receiving angle, light emitted by the third collimator is firstly transmitted into the polarization analyzer, and the polarization state of emergent light is observed to ensure that the light emitted by the polarization-maintaining optical fiber is linearly polarized light, so that the light outlet of the third collimator is aligned with the light inlet of the polarization analyzer to ensure the testing precision. Similarly, when the analyzer and the dynamometer are used for measuring the extinction ratio and the receiving angle, and when the dynamometer is used for observing the state that light is coupled into the polarization-maintaining optical fiber after passing through the polarizer, the light outlet of the third collimator needs to be aligned with the light inlet of each device to ensure the test precision and avoid light leakage.
As a further technical scheme, the first collimator is fixed above the first adjusting frame through a collimator fixing frame; the second collimator is fixed above the third adjusting frame through a collimator fixing frame; and the third collimator is fixed at a position matched with the second collimator through a collimator fixing frame.
As a further technical solution, the adjusting components of the first adjusting rack and the third adjusting rack are five-dimensional adjusting components, which respectively include: the three-dimensional translation adjusting knob is used for adjusting the translation distances in two directions of a horizontal plane and in the vertical direction; the pitching adjusting knob is arranged below the collimator fixing frame and used for adjusting the pitching angle of the light outlet of the collimator; and the rotation adjusting knob is used for adjusting the rotation angle of the light outlet of the collimator on the vertical plane. The adjustment of a horizontal plane and a vertical plane, the up-down pitching adjustment and the rotation adjustment of the vertical plane are realized through the five-dimensional adjusting frame, so that the accurate adjustment of the position of a light beam coming out from a light outlet of the collimator is realized, and the testing precision is improved.
As a further technical solution, the second adjusting bracket has the same configuration as the first adjusting bracket and the third adjusting bracket.
As a further technical scheme, the first adjusting frame and the third adjusting frame are respectively provided with a top supporting plate, an upper supporting plate and a lower supporting plate which are sequentially connected from top to bottom; the top supporting plate is used for supporting the collimator fixing frame, and the upper supporting plate and the lower supporting plate are used for fixing the adjusting knob; the upper supporting plate is movably connected with the lower supporting plate at one end.
As a further technical scheme, the pitching adjusting knob is fixed on the upper supporting plate, one end of the pitching adjusting knob is hinged with the top supporting plate, and the other end of the pitching adjusting knob is abutted to the bottom of the top supporting plate through the knob; the rotary adjusting knob is fixed on the upper supporting plate; the three-dimensional translation adjusting knobs are all fixed on the lower supporting plate.
As a further technical scheme, the polarizer is fixed above the second adjusting frame through the top supporting plate.
As a further technical scheme, the first collimator, the second collimator and the third collimator are all fixed in a collimator fixing frame through fixing screws.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) The utility model discloses a first alignment jig makes the light that the light source sent can incide the polarizer perpendicularly through first collimater, cooperation through first alignment jig and third alignment jig makes the light coincidence of first collimater and second collimater, through the rotation angle of second alignment jig adjustment polarizer, and cooperation polarization analysis appearance, make the light that polarization maintaining optical fiber came out be the inclined to one side positive light of line, the angular rotation through the polarizer simultaneously, cooperation analyzer and power meter, realize extinction ratio and angle of acceptance and measure.
(2) The utility model discloses a test light path is simple, and it is convenient to adjust, and can obtain accurate test result.
Drawings
Fig. 1 is a schematic structural diagram of a device for testing an extinction ratio and an acceptance angle of a polarization maintaining optical fiber according to an embodiment of the present invention.
In the figure: 100. a first adjusting bracket; 200. a second adjusting bracket; 300. a third adjusting bracket; 1. a first Y-direction knob; 2. a first X-direction knob; 3. a first Z-direction knob; 4. a first pitch adjustment knob; 5. a first rotary adjustment knob; 6. a second Y-direction knob; 7. a second X-direction knob; 8. a second Z-direction knob; 9. a second pitch adjustment knob; 10. a second rotary adjustment knob; 11. a first collimator mount; 12. a first fixing screw; 13. a second collimator mount; 14. a second fixing screw; 15. a third collimator mount; 16. a third fixing screw; 17. a light source optical fiber; 18. a first collimator; 19. a polarizer; 20. a second collimator; 21. a polarization maintaining fiber; 22. a third collimator; 23. an analyzer; 24. a power meter; 25. a polarization analyzer.
Detailed Description
The technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The utility model provides a testing arrangement of 21 extinction ratios of polarization maintaining fiber and acceptance angle, as shown in fig. 1, include first adjustment frame 100, second adjustment frame 200, third adjustment frame 300, analyzer 23, dynamometer 24 and polarization analyzer 25 that set up according to the light path.
Wherein, the below of first alignment jig is equipped with first adjustment subassembly, and the top is connected with first collimator 18 mount 11 through the top backup pad, be equipped with first collimator 18 in the first collimator 18 mount 11, the one end that first collimator 18 faced the light source is connected with light source optic fibre 17.
The first collimator 18 is fixed in the fixing frame 11 of the first collimator 18 through the upper first fixing screw 12.
The first adjustment assembly is a five-dimensional adjustment assembly comprising: the first three-dimensional translation adjusting knob is used for adjusting translation distances in two directions of a horizontal plane and in a vertical direction; the first pitching adjusting knob 4 is arranged below the first collimator 18 fixing frame 11 and is used for adjusting the pitching angle of the light outlet of the first collimator 18; and the first rotary adjusting knob 5 is used for adjusting the rotating angle of the light outlet of the first collimator 18 on the vertical plane.
The first three-dimensional translation adjusting knob further comprises a first X-direction knob 2, a first Y-direction knob 1 and a first Z-direction knob 3.
Wherein, the top of the second fixing frame is provided with a polarizer 19, and an adjusting component is arranged below the second fixing frame. The adjusting component can be configured as the first adjusting component, and can also be configured in other ways as long as the polarizer 19 can be rotated angularly.
A second adjusting assembly is arranged below the third adjusting frame, a second collimator 20 fixing frame 13 is connected to the upper portion of the third adjusting frame through a top supporting plate, a second collimator 20 is arranged in the second collimator 20 fixing frame 13, and the second collimator 20 is fixed in the second collimator 20 fixing frame 13 through a second fixing screw 14. One end of the second collimator 20 faces the polarizer 19, and the other end is connected with the polarization maintaining fiber 21. The other end of the polarization maintaining fiber 21 is connected to a third collimator 22, and the third collimator 22 penetrates through the upper part of a fixing frame 15 of the third collimator 22 and is fixed in the fixing frame 15 of the third collimator 22 through a third fixing screw 16.
The second adjustment assembly is a five-dimensional adjustment assembly comprising: the second three-dimensional translation adjusting knob is used for adjusting the translation distances in two directions of a horizontal plane and in the vertical direction; the second pitching adjusting knob 9 is arranged below the fixing frame 13 of the second collimator 20 and is used for adjusting the pitching angle of the light outlet of the second collimator 20; and a second rotary adjusting knob 10 for adjusting the rotation angle of the light outlet of the second collimator 20 on the vertical plane.
The second three-dimensional translation adjusting knob further comprises a second X-direction knob 7, a second Y-direction knob 6 and a second Z-direction knob 8.
The first adjusting frame and the third adjusting frame are respectively provided with a top supporting plate, an upper supporting plate and a lower supporting plate which are sequentially connected from top to bottom. The top supporting plate is used for supporting the collimator fixing frame, and the upper supporting plate and the lower supporting plate are used for fixing the adjusting knob.
The upper supporting plate is movably connected with the lower supporting plate at one end. The first rotary adjusting knob 5 and the second rotary adjusting knob 10 are fixed on the upper supporting plates of the adjusting frames respectively, and when the rotary adjusting is carried out, the pitching adjusting knob, the top supporting plate and the corresponding collimator are driven to rotate in the vertical plane through the movable connecting end.
The pitching adjusting knob is fixed on the upper supporting plate, one end of the pitching adjusting knob is hinged with the top supporting plate, and the other end of the pitching adjusting knob is abutted to the bottom of the top supporting plate through the knob. When the pitching adjusting knob is rotated, the top supporting plate is driven to ascend or descend, and then the corresponding collimator is driven to realize up-and-down pitching.
The three-dimensional translation adjusting knobs are fixed on the lower supporting plate and used for respectively realizing the translation adjustment of two dimensions of a horizontal plane and one dimension of a vertical plane.
The light inlets of the analyzer 23, the power meter 24 and the polarization analyzer 25 are all adapted to the light outlet of the third collimator 22. Before testing the extinction ratio and the acceptance angle, the light from the third collimator 22 is transmitted into the polarization analyzer 25, and the polarization state of the emergent light is observed to ensure that the light from the polarization maintaining fiber 21 is linearly polarized light, so that the light outlet of the third collimator 22 is aligned with the light inlet of the polarization analyzer 25 to ensure the testing precision. Similarly, when the analyzer 23 and the power meter 24 are used to perform extinction ratio and reception angle measurement, and when the power meter 24 is used to observe the state that light is coupled into the polarization maintaining fiber 21 after passing through the polarizer 19, the light outlet of the third collimator 22 needs to be aligned with the light inlet of each device to ensure the test precision and avoid light leakage.
The testing method of the device comprises the following steps:
the first step is as follows: building a light path according to the figure 1;
the second step: adjusting an X-direction knob, a Y-direction knob, a Z-direction knob, a pitching adjusting knob and a rotating adjusting knob of the first adjusting frame to enable light emitted by a light source to vertically enter a polarizer 19 after passing through a first collimator 18;
the third step: the end of the polarization maintaining optical fiber 21 connected with the third collimator 22 is connected with a light source, and the X-direction knob, the Y-direction knob, the Z-direction knob, the pitching adjusting knob and the rotating adjusting knob of the third adjusting frame are adjusted, so that light emitted from the second collimator 20 vertically strikes the polarizer 19;
the fourth step: adjusting the Y-direction knob and the Z-direction knob of the first adjusting frame and the Y-direction knob and the Z-direction knob of the third adjusting frame to enable the light emitted by the first collimator 18 and the light emitted by the second collimator 20 to coincide; at this time, the polarization maintaining optical fiber 21 is connected with the third collimator 22, the analyzer 23 is removed, the pitching adjusting knob and the rotating adjusting knob of the first adjusting frame and the third adjusting frame are finely adjusted, the power meter 24 is observed and is adjusted until the reading is maximum, and at this time, light emitted by the light source is coupled into the polarization maintaining optical fiber 21 after passing through the polarizer 19;
the fifth step: taking the analyzer 23 and the power meter 24 apart, allowing the light from the third collimator 22 to enter a polarization analyzer 25, observing the polarization state of the emergent light, and rotating the polarizer 19 to make the light from the polarization-maintaining fiber 21 be linearly polarized light;
and a sixth step: removing the polarization analyzer 25, adding the analyzer 23 and the power meter 24, rotating the analyzer 23 for one circle, recording the maximum value (Pmax) and the minimum value (Pmin) of the power, and the extinction ratio PER =10lg (Pmax/Pmin), which is the extinction ratio of the polarization-maintaining fiber 21 when the polarization direction of the incident light is completely aligned with the fast axis or the slow axis of the fiber;
the seventh step: when the polarizer 19 is slightly rotated, and the extinction ratio of the polarization maintaining fiber 21 is tested, the rotation angle of the polarizer 19 is the receiving angle of the polarization maintaining fiber 21 when the extinction ratio is 20 dB.
The test method has the advantages of simple light path, convenient adjustment and accurate test result.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A testing device for extinction ratio and receiving angle of polarization maintaining optical fiber is characterized by comprising an analyzer, a power meter, a polarization analyzer and three adjusting frames arranged at intervals; wherein, three the alignment jig is respectively: the first adjusting frame is fixedly provided with a first collimator and a first adjusting assembly, and one end of the first collimator is connected with a light source optical fiber; the second adjusting frame is fixed with a polarizer; and the third adjusting frame is fixedly provided with a second collimator and a second adjusting assembly, one end of the second collimator is connected with one end of the polarization maintaining optical fiber, and the other end of the polarization maintaining optical fiber is connected with the third collimator.
2. The device for testing the extinction ratio and the acceptance angle of the polarization-maintaining optical fiber according to claim 1, wherein the light inlets of the analyzer, the power meter and the polarization analyzer are matched with the light outlet of the third collimator.
3. The device for testing the extinction ratio and the acceptance angle of the polarization maintaining optical fiber according to claim 1, wherein the first collimator is fixed above the first adjusting frame through a collimator fixing frame; the second collimator is fixed above the third adjusting frame through a collimator fixing frame; and the third collimator is fixed at a position matched with the second collimator through a collimator fixing frame.
4. The apparatus according to claim 1 or 3, wherein the adjusting components of the first adjusting rack and the third adjusting rack are five-dimensional adjusting components, each of which comprises: the three-dimensional translation adjusting knob is used for adjusting translation distances in two directions of a horizontal plane and in a vertical direction; the pitching adjusting knob is arranged below the collimator fixing frame and used for adjusting the pitching angle of the light outlet of the collimator; and the rotation adjusting knob is used for adjusting the rotation angle of the light outlet of the collimator on the vertical plane.
5. The device for testing the extinction ratio and the acceptance angle of the polarization-maintaining optical fiber according to claim 4, wherein the second adjusting rack is configured in the same manner as the first adjusting rack and the third adjusting rack.
6. The device for testing the extinction ratio and the reception angle of the polarization maintaining optical fiber according to claim 4, wherein the first adjusting frame and the third adjusting frame are respectively provided with a top supporting plate, an upper supporting plate and a lower supporting plate which are sequentially connected from top to bottom; the top supporting plate is used for supporting the collimator fixing frame, and the upper supporting plate and the lower supporting plate are used for fixing the adjusting knob; the upper supporting plate is movably connected with the lower supporting plate at one end.
7. The device for testing the extinction ratio and the acceptance angle of the polarization maintaining optical fiber according to claim 6, wherein the pitch adjusting knob is fixed on the upper support plate, one end of the pitch adjusting knob is hinged with the top support plate, and the other end of the pitch adjusting knob is abutted with the bottom of the top support plate through the knob; the rotary adjusting knob is fixed on the upper supporting plate; the three-dimensional translation adjusting knobs are all fixed on the lower supporting plate.
8. The device for testing the extinction ratio and the acceptance angle of the polarization-maintaining optical fiber according to claim 6, wherein the polarizer is fixed above the second adjusting frame through a top supporting plate.
9. The apparatus of claim 1, wherein the first collimator, the second collimator, and the third collimator are fixed in the collimator holder by screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221797714.6U CN218121346U (en) | 2022-07-13 | 2022-07-13 | Testing device for extinction ratio and receiving angle of polarization maintaining optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221797714.6U CN218121346U (en) | 2022-07-13 | 2022-07-13 | Testing device for extinction ratio and receiving angle of polarization maintaining optical fiber |
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| CN218121346U true CN218121346U (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221797714.6U Active CN218121346U (en) | 2022-07-13 | 2022-07-13 | Testing device for extinction ratio and receiving angle of polarization maintaining optical fiber |
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