CN213600922U - Manual adjustable single-axis optical fiber extrusion type polarization controller - Google Patents

Abstract

The utility model discloses a manual adjustable single-shaft optical fiber extrusion type polarization controller, which relates to the field of optical communication, and comprises a manual lifting platform, an optical fiber base, an optical fiber pressing block, a spring, an optical fiber pressing block seat, a connecting cylinder, a nut, an optical fiber pressing block seat fixing shell and a lifting pedestal; the optical fiber pressing block is positioned above the optical fiber base; the optical fiber base is fixed on the manual lifting platform, and the manual lifting platform is fixed on the lifting platform base; the optical fiber pressing block seat is provided with a through hole, the connecting cylinder penetrates through the through hole, the connecting cylinder comprises a first end and a second end which are opposite, the nut is fixed at the first end, the optical fiber pressing block is fixedly connected with the second end, the maximum outer diameter of the nut is larger than the outer diameter of the through hole, and the spring is arranged between the optical fiber pressing block and the optical fiber pressing block seat; the optical fiber pressing block seat is fixedly connected with the optical fiber pressing block seat fixing shell, and the optical fiber pressing block seat fixing shell is fixedly connected with the lifting pedestal. The technical scheme of the application can effectively avoid the optical fiber from being broken by pressure.

Description

Manual adjustable single-axis optical fiber extrusion type polarization controller

Technical Field

The application relates to the field of optical communication, in particular to a manually adjustable single-axis optical fiber extrusion type polarization controller.

Background

In the field of optical communications, in standard communications optical fibres in practical use, the state of polarization of transmitted light is constantly changing along the fibre due to irregular birefringence in the fibre caused by thermal, mechanical and core irregularities, and it is common to use a polarization controller to overcome this change, which can convert any given state of polarization into any desired state of polarization. Currently, there are several types of polarization controllers: the wave plate type, the electro-optic crystal type and the optical fiber extrusion type polarization controllers are few in practical application due to the factors that the polarization controllers in the first two forms are high in insertion loss, are greatly influenced by the environment and the like, and the optical fiber extrusion type polarization controllers are generally adopted in the development of the existing optical communication systems.

The existing optical fiber extrusion type polarization controller is divided into an automatic type and a manual type, and compared with the automatic optical fiber extrusion type polarization controller, the manual optical fiber extrusion type polarization controller has the advantages of low price cost, small volume and the like. The basic working principle of the manual optical fiber extrusion type polarization controller is as follows: the optical fiber is placed in the optical fiber clamp, and the pressure applied to the optical fiber clamp is manually adjusted to extrude the optical fiber through the optical fiber clamp, so that the optical fiber is deformed, the refractive index of the optical fiber is changed, and the polarization state of light is further changed. Because the diameter of the optical fiber is smaller, the diameter is usually only 125um, the requirement on the extrusion precision is higher, and in practical use, the manual optical fiber extrusion type polarization controller is easy to cause the situation that the optical fiber is broken due to excessive extrusion.

SUMMERY OF THE UTILITY MODEL

The utility model provides a manual adjustable unipolar optic fibre extrusion type polarization controller to solve present manual type polarization controller and appear extruding easily and excessively lead to optic fibre to be pressed disconnected problem.

The embodiment of the utility model provides a concrete technical scheme is:

a manual adjustable single-shaft optical fiber extrusion type polarization controller comprises a manual lifting platform, an optical fiber base, an optical fiber pressing block, a spring, an optical fiber pressing block seat, a connecting cylinder, a nut, an optical fiber pressing block seat fixing shell and a lifting pedestal; the optical fiber pressing block is positioned above the optical fiber base; the optical fiber base is fixed on the manual lifting table, and the manual lifting table is fixed on the lifting table seat; the optical fiber pressing block seat is provided with a through hole, the connecting cylinder penetrates through the through hole, the connecting cylinder comprises a first end and a second end which are opposite, the nut is fixed at the first end, the optical fiber pressing block is fixedly connected with the second end, the maximum outer diameter of the nut is larger than the outer diameter of the through hole, and the spring is arranged between the optical fiber pressing block and the optical fiber pressing block seat; the optical fiber pressing block seat is fixedly connected with the optical fiber pressing block seat fixing shell through screws, and the optical fiber pressing block seat fixing shell is fixedly connected with the lifting pedestal through screws.

Preferably, the first end of the connecting cylinder is provided with a scale.

Preferably, the optical fiber pressing block comprises an optical fiber pressing block boss and an optical fiber pressing block plate, the optical fiber pressing block boss is located on the lower side of the optical fiber pressing block plate, the optical fiber pressing block boss and the optical fiber pressing block plate are integrally formed, the horizontal cross-sectional area of the optical fiber pressing block boss is smaller than that of the optical fiber pressing block plate, and a spring limiting cylinder is arranged on the upper surface of the optical fiber pressing block plate.

Preferably, the optical fiber base comprises an optical fiber base boss and an optical fiber base plate, the optical fiber base boss is located on the upper side of the optical fiber base plate, the optical fiber base boss and the optical fiber base plate are integrally formed, the horizontal cross-sectional area of the optical fiber base boss is smaller than that of the optical fiber base plate, and the optical fiber base plate is fixed on the manual lifting platform through screws.

Preferably, the horizontal cross-sectional shape of the inside of the optical fiber pressure block seat fixing shell is the same as the horizontal cross-sectional shape of the optical fiber pressure block plate, and the horizontal cross-sectional area of the inside of the optical fiber pressure block seat fixing shell is the same as the horizontal cross-sectional area of the optical fiber pressure block plate.

Preferably, the optical fiber pressing block seat is provided with a through hole, the through hole is located in the center of the optical fiber pressing block seat, the central position of the optical fiber pressing block is provided with a groove, the side wall of the groove is provided with a thread, the second end of the connecting cylinder is provided with a butt joint thread in butt joint with the thread of the groove, and the connecting cylinder is in threaded connection with the optical fiber pressing block.

Preferably, the spring set up in between optic fibre briquetting and the optic fibre briquetting seat, the spacing cylinder of spring alternate in the one end of spring, the quantity of the spacing cylinder of spring equals the quantity of spring, the quantity of spring is 4, 4 spring symmetric distribution in connect the cylinder around.

Preferably, the maximum distance between the upper surface of the optical fiber pressure block plate and the lower surface of the optical fiber pressure block seat is smaller than the vertical height of the optical fiber pressure block seat fixing shell.

Preferably, the lift pedestal is "U" shape, the lift pedestal includes two lateral walls of vertical and parallel arrangement, the fixed casing of optic fibre briquetting seat passes through the fix with screw in two lateral wall tops of lift pedestal, optic fibre along being on a parallel with the direction level of two lateral walls of lift pedestal place in the optic fibre briquetting with between the optic fibre base.

Preferably, the manual adjustable unipolar optic fibre extrusion type polarization controller still includes from the bottom up and superposes optic fibre holder, sheet rubber, the optic fibre preforming that sets up in proper order, will through the screw the optic fibre preforming with the sheet rubber is fixed in the optic fibre holder will through the screw the optic fibre holder is fixed in the optic fibre bed plate, the optic fibre holder the sheet rubber and the optic fibre preforming is located the optic fibre route, optic fibre is located the optic fibre holder with between the sheet rubber.

According to the above technical scheme, the application provides a manual adjustable unipolar optic fibre extrusion type polarization controller, polarization controller wherein includes manual elevating platform, fiber base, optic fibre briquetting and spring, when the height of manual adjustment manual elevating platform takes place to deform with extrusion optic fibre, the spring that sets up also receives certain pressure and takes place deformation and then can cushion the extrusion force that extrudees optic fibre for optic fibre is unlikely to receive excessive extrusion, can avoid adjusting the emergence that excessively leads to optic fibre to be pressed the situation because of manual elevating platform. In addition, the first end of connecting the cylinder in this application is provided with the scale, can measure and adjust the displacement change that the deformation in-process connecting the column body takes place for optic fibre briquetting seat takes place for optic fibre, through a series of calculations, can calculate the atress change when optic fibre takes place to deform according to above-mentioned displacement change.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.

FIG. 1 is a schematic cross-sectional view of a manually adjustable single-axis fiber-extruded polarization controller according to the present application;

FIG. 2 is a schematic diagram of a rear view of a manually adjustable single-axis fiber-extruded polarization controller according to the present application;

fig. 3 is a schematic structural diagram of a manually adjustable single-axis fiber-compression-type polarization controller that does not include a fiber press block seat fixing housing and a lift table seat according to the present application.

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The application provides a manually adjustable unipolar optic fibre extrusion type polarization controller, figure 1 is the section structure sketch of a manually adjustable unipolar optic fibre extrusion type polarization controller of this application, figure 2 is the back view structure sketch of a manually adjustable unipolar optic fibre extrusion type polarization controller of this application, and figure 3 does not include the manually adjustable unipolar optic fibre extrusion type polarization controller structure sketch of the fixed casing of optic fibre briquetting seat and lift pedestal for this application. Referring to fig. 1 to 3, a manual adjustable single-axis optical fiber extrusion type polarization controller may include a manual lifting table 1, an optical fiber base 2, an optical fiber pressing block 3, a spring 4, an optical fiber pressing block seat 5, a connection cylinder 6, a nut 7, an optical fiber pressing block seat fixing housing 11, and a lifting table seat 12. Manual elevating platform 1 includes the elevating platform body, scale and manual regulation swing handle, and scale and manual regulation swing handle all are located one side of the elevating platform body, and the scale can set up in the homonymy of the elevating platform body with the manual regulation swing handle and also can set up in the heteronymy of the elevating platform body, and manual elevating platform 1 adopts the aluminum alloy material preparation to form. Optical fiber base 2 is fixed in manual elevating platform 1, optical fiber base 2 includes optical fiber base boss and optical fiber base plate, the optical fiber base boss is located the upside of optical fiber base plate, optical fiber base boss and optical fiber base plate integrated into one piece, the horizontal cross sectional area of optical fiber base boss is less than the horizontal cross sectional area of optical fiber base plate, the screw has been seted up in the four corners of optical fiber base plate, corresponding screw has also been seted up in the elevating platform body four corners of manual elevating platform 1, be fixed in manual elevating platform 1 with the optical fiber base plate through the screw, optical fiber base 2 is formed by the stainless steel material preparation. The optical fiber pressing block 3 is positioned above the optical fiber base 2. The optical fiber pressing block 3 comprises an optical fiber pressing block boss and an optical fiber pressing block plate, the optical fiber pressing block boss is located on the lower side of the optical fiber pressing block plate, the optical fiber pressing block boss and the optical fiber pressing block plate are integrally formed, the horizontal cross-sectional area of the optical fiber pressing block boss is smaller than that of the optical fiber pressing block plate, the upper surface of the optical fiber pressing block plate is provided with a spring limiting cylinder, and the optical fiber pressing block 3 is made of stainless steel materials. Spring 4 sets up between optic fibre briquetting 3 and optic fibre briquetting seat 5, and the spacing cylinder of spring alternates in the one end of spring 4, and preferably, spring 4 is the tower spring promptly spring 4 is down trapezoidal, and the spacing cylinder of spring alternates in the narrower one end of 4 opening bores of spring, and the quantity of the spacing cylinder of spring equals the quantity of spring 4, and the quantity of spring 4 is 4, 4 spring 4 symmetric distribution around connecting cylinder 6. The optical fiber pressing block seat 5 is provided with a through hole, the through hole is positioned in the center of the optical fiber pressing block seat 5, the connecting cylinder 6 penetrates through the through hole, the optical fiber pressing block seat 5 and the connecting cylinder 6 are made of stainless steel materials, the connecting cylinder 6 comprises a first end and a second end which are opposite, the first end of the connecting cylinder 6 is provided with threads, the nut 7 is fixed at the first end, the optical fiber pressing block 3 and the second end are fixedly connected, specifically, the central position of the optical fiber pressing block 3 is provided with a groove, namely, the central position of one side of the optical fiber pressing block plate of the optical fiber pressing block 3 is provided with a groove, the side wall of the groove is provided with threads, the second end of the connecting cylinder 6 is provided with butt joint threads which are in butt joint with. The nut 7 is a hexagon nut, the maximum outer diameter of the nut 7 is larger than the outer diameter of the through hole formed in the optical fiber pressing block seat 5, the nut 7 is limited, the nut 7 is prevented from penetrating through the through hole formed in the optical fiber pressing block seat 5, and then the connecting cylinder 6 and the optical fiber pressing block 3 can be limited. Screw holes are formed in the periphery of the optical fiber pressing block seat 5, corresponding screw holes are formed in the top end of the side wall of the optical fiber pressing block seat fixing shell 11, and the optical fiber pressing block seat 5 is fixedly connected with the optical fiber pressing block seat fixing shell 11 through screws. The optical fiber pressing block seat fixing shell 11 is made of an aluminum alloy material, the horizontal section shape of the inside of the optical fiber pressing block seat fixing shell 11 is the same as that of an optical fiber pressing block plate of an optical fiber pressing block 3, the horizontal section area of the inside of the optical fiber pressing block seat fixing shell 11 is the same as that of the optical fiber pressing block plate, the maximum distance between the upper surface of the optical fiber pressing block plate and the lower surface of the optical fiber pressing block seat 5 is smaller than the vertical height of the optical fiber pressing block seat fixing shell 11, the optical fiber pressing block plate can be just clamped by the optical fiber pressing block seat fixing shell 11 through the implementation mode, and the optical fiber pressing block plate can only move inside the optical fiber pressing block seat fixing shell 11. The spring 4 is located between the optical fiber pressing block plate of the optical fiber pressing block 3 and the optical fiber pressing block seat 5, that is, the spring 4 is located in the inner space of the optical fiber pressing block seat fixing shell 11. Through the limit of the nut 7 to the connecting cylinder 6 and the optical fiber pressing block 3 and the limit of the length of the connecting cylinder 6, the optical fiber pressing block plate of the optical fiber pressing block 3 can only move inside the optical fiber pressing block seat fixing shell 11, and the spring is always in a compression state. The manual lifting table 1 is fixed to the lifting table base 12, and can be fixed by means of screws, bonding, clamping, and the like. The lower extreme of the fixed casing 11 of optic fibre briquetting seat is provided with the side, is provided with the screw on the lower extreme side of the fixed casing 11 of optic fibre briquetting seat, and corresponding screw has been seted up on the lateral wall top of lift pedestal 12, and optic fibre briquetting seat fixed casing 11 passes through screw fixed connection with lift pedestal 12. The lifting pedestal 12 is "U" shape, and the lifting pedestal 12 includes two lateral walls of vertical and parallel arrangement, and the fixed casing 11 of optic fibre briquetting seat is fixed in two lateral wall tops of lifting pedestal 12 through the screw, and lifting pedestal 12 adopts the aluminium alloy material preparation to form. The optical fiber is horizontally placed between the optical fiber pressing block 3 and the optical fiber base 2 along the direction parallel to the two side walls of the lifting pedestal 12, namely, the optical fiber is horizontally placed between the optical fiber pressing block boss and the optical fiber base boss along the direction parallel to the two side walls of the lifting pedestal 12. In addition, in order to facilitate manual adjustment of the manual lifting table 1, the manual adjustment knob of the manual lifting table 1 is disposed on one side of the lifting table body and on one side that is not shielded by the two sidewalls of the lifting table base 12.

Through above-mentioned embodiment, the manual regulation swing handle of manual rotatory manual elevating platform 1 can be so that the vertical height of the elevating platform body of manual elevating platform 1 changes, and when adjusting the vertical height increase that manual regulation swing handle made the elevating platform body, fiber base 2 can the rebound, and then by fiber base 2 pushing up fiber briquetting 3 rebound, drives and connects cylinder 6 and nut 7 rebound, and spring 4 can further compression. When placing the optic fibre, will reduce the vertical height of the elevating platform body earlier for optic fibre briquetting boss and fiber base boss separation, so that put into optic fibre between optic fibre briquetting boss and fiber base boss, after optic fibre placed in place, increase the vertical height of the elevating platform body in order to extrude optic fibre. When the height of manual regulation manual elevating platform takes place to deform in order to extrude optic fibre, the spring that sets up also receives certain pressure and takes place deformation and then can cushion the extrusion force that extrudees optic fibre for optic fibre is unlikely to receive excessive extrusion, can avoid leading to the emergence that optic fibre was pressed the disconnected situation because of manual elevating platform adjusts excessively.

In a feasible embodiment, referring to fig. 1 to 3, the above-mentioned manually adjustable single-axis optical fiber extrusion type polarization controller further includes an optical fiber holder 8, a rubber sheet 9, and an optical fiber pressing sheet 10, which are sequentially stacked from bottom to top, the optical fiber pressing sheet 10 and the rubber sheet 9 are fixed to the optical fiber holder 8 by screws, the optical fiber holder 8 is fixed to the optical fiber base plate of the optical fiber base 2 by screws, the vertical height of the optical fiber holder 8 is consistent with the vertical height of the boss of the optical fiber base, the optical fiber holder 8, the rubber sheet 9 and the optical fiber pressing sheet 10 are located on the optical fiber path, the optical fiber is located between the optical fiber holder 8 and the rubber sheet 9, and the rubber sheet 9 is arranged to prevent the optical fiber from being broken. The optical fiber clamping seat 8, the rubber sheet 9 and the optical fiber pressing sheet 10 are combined together to further limit the optical fiber, so that the optical fiber can be prevented from swinging. Preferably, as shown in fig. 3, a set of fiber holder 8, rubber sheet 9 and fiber pressing sheet 10 are disposed on the fiber path and on both sides of the fiber base boss.

In a possible embodiment, the first end of the connecting cylinder 6 is provided with a scale, i.e. a scale is provided at the end of the connecting cylinder 6 which is fixedly connected to the nut 7. The displacement change of the connecting column body relative to the optical fiber pressing block seat in the deformation process of the extrusion optical fiber can be measured through the set scales, and the stress change of the optical fiber during deformation can be measured according to the displacement change through a series of calculations.

The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.

Claims (10)

1. A manual adjustable single-shaft optical fiber extrusion type polarization controller is characterized by comprising a manual lifting platform (1), an optical fiber base (2), an optical fiber pressing block (3), a spring (4), an optical fiber pressing block seat (5), a connecting cylinder (6), a nut (7), an optical fiber pressing block seat fixing shell (11) and a lifting pedestal (12);

the optical fiber pressing block (3) is positioned above the optical fiber base (2);

the optical fiber base (2) is fixed on the manual lifting platform (1), and the manual lifting platform (1) is fixed on the lifting platform base (12);

the optical fiber pressing block seat (5) is provided with a through hole, the connecting cylinder (6) penetrates through the through hole, the connecting cylinder (6) comprises a first end and a second end which are opposite, the nut (7) is fixed at the first end, the optical fiber pressing block (3) is fixedly connected with the second end, the maximum outer diameter of the nut (7) is larger than the outer diameter of the through hole, and the spring (4) is arranged between the optical fiber pressing block (3) and the optical fiber pressing block seat (5);

the optical fiber pressing block seat (5) is fixedly connected with the optical fiber pressing block seat fixing shell (11) through screws, and the optical fiber pressing block seat fixing shell (11) is fixedly connected with the lifting pedestal (12) through screws.

2. A manually adjustable single-axis fiber extruded polarization controller of claim 1, wherein the first end of the connecting cylinder (6) is provided with a scale.

3. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 1, wherein the optical fiber pressing block (3) comprises an optical fiber pressing block boss and an optical fiber pressing block plate, the optical fiber pressing block boss is located at the lower side of the optical fiber pressing block plate, the optical fiber pressing block boss is integrally formed with the optical fiber pressing block plate, the horizontal cross-sectional area of the optical fiber pressing block boss is smaller than that of the optical fiber pressing block plate, and a spring limiting cylinder is arranged on the upper surface of the optical fiber pressing block plate.

4. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 3, wherein the optical fiber base (2) comprises an optical fiber base boss and an optical fiber base plate, the optical fiber base boss is located on the upper side of the optical fiber base plate, the optical fiber base boss and the optical fiber base plate are integrally formed, the horizontal cross-sectional area of the optical fiber base boss is smaller than that of the optical fiber base plate, and the optical fiber base plate is fixed to the manual lifting table (1) through screws.

5. The manually adjustable uniaxial optical fiber extrusion type polarization controller of claim 3, wherein the horizontal cross-sectional shape inside the optical fiber press block holder fixing housing (11) is the same as the horizontal cross-sectional shape of the optical fiber press block plate, and the horizontal cross-sectional area size inside the optical fiber press block holder fixing housing (11) is the same as the horizontal cross-sectional area size of the optical fiber press block plate.

6. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 5, wherein the optical fiber pressing block seat (5) is provided with a through hole, the through hole is positioned at the center of the optical fiber pressing block seat (5), the central position of the optical fiber pressing block (3) is provided with a groove, the side wall of the groove is provided with a thread, the second end of the connecting cylinder (6) is provided with a butt joint thread which is in butt joint with the thread of the groove, and the connecting cylinder (6) is in threaded connection with the optical fiber pressing block (3).

7. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 6, wherein the springs (4) are arranged between the optical fiber pressing block (3) and the optical fiber pressing block seat (5), the spring limiting cylinders are inserted at one ends of the springs (4), the number of the spring limiting cylinders is equal to that of the springs (4), the number of the springs (4) is 4, and the 4 springs (4) are symmetrically distributed around the connecting cylinder (6).

8. The manually adjustable uniaxial fiber extrusion polarization controller of claim 7, wherein the maximum distance between the upper surface of the fiber press plate and the lower surface of the fiber press block seat (5) is less than the vertical height of the fiber press block seat fixed housing (11).

9. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 4, wherein the lifting pedestal (12) is in a "U" shape, the lifting pedestal (12) comprises two side walls which are vertically and parallelly arranged, the optical fiber pressing block seat fixing shell (11) is fixed on the top ends of the two side walls of the lifting pedestal (12) through screws, and an optical fiber is horizontally placed between the optical fiber pressing block (3) and the optical fiber base (2) along a direction parallel to the two side walls of the lifting pedestal (12).

10. The manually adjustable uniaxial optical fiber extrusion type polarization controller according to claim 9, further comprising an optical fiber holder (8), a rubber sheet (9), and an optical fiber pressing sheet (10) stacked in sequence from bottom to top, wherein the optical fiber pressing sheet (10) and the rubber sheet (9) are fixed to the optical fiber holder (8) by screws, the optical fiber holder (8) is fixed to the optical fiber base plate by screws, the optical fiber holder (8), the rubber sheet (9), and the optical fiber pressing sheet (10) are located on an optical fiber path, and an optical fiber is located between the optical fiber holder (8) and the rubber sheet (9).

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