Partial coupler and manufacturing method thereof

Abstract

The invention discloses a partial coupler and a manufacturing method thereof, and particularly relates to the field of optical communication, and the manufacturing method comprises the following steps: S1, preparing materials; s2, preparing an optical fiber; s3, optical fiber fusion welding: aligning the polarization axis of the optical fiber, performing fusion welding on the input polarization-maintaining optical fiber and the input port of the coupler, and performing fusion welding on the output polarization-maintaining optical fiber and the output port of the coupler to obtain a complete polarization-maintaining coupler assembly; s4, checking and testing: checking the loss condition of each connection point of the polarization-maintaining coupler assembly by using an optical power meter; and S5, installing a shell, installing the polarization-maintaining coupler assembly in the shell, and fixing the polarization-maintaining coupler assembly after the position is determined through an adjusting mechanism. According to the invention, a scheme for dividing one beam of light into four beams of linear polarization parallel light and a method for coupling the four beams of linear polarization parallel light and the four-tail optical fiber can be provided, so that the size of the coupler can be effectively reduced, the integrated and lightweight design is realized, and the miniaturization requirement of modern communication equipment is met.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and more particularly to a partial coupler and a manufacturing method thereof. Background Art

[0002] As a key device for realizing linearly polarized light coupling, splitting and multiplexing, polarization-maintaining coupler can stably transmit linearly polarized light and keep its polarization state unchanged, which is crucial for improving the stability and reliability of fiber-optic communication systems and enhancing the measurement accuracy and sensitivity of fiber-optic sensors. The application of polarization-maintaining coupler not only promotes the further development of fiber-optic technology, but also provides strong support for building high-speed, large-capacity, long-distance fiber-optic communication networks and high-precision fiber-optic sensing systems.

[0003] The existing 1×4 polarization-maintaining coupler is large in size, which is not conducive to integrated and lightweight design, and is also costly, making it difficult to meet the miniaturization requirements of modern communication equipment. Summary of the invention

[0004] The present invention provides a polarization-maintaining coupler and a manufacturing method thereof, aiming to solve the problem that the existing polarization-maintaining coupler is relatively large in size, which is not conducive to achieving integrated and lightweight design, and is relatively costly, making it difficult to meet the miniaturization requirements of modern communication equipment.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for manufacturing a partial coupler, comprising the following steps:

[0006] S1: Prepare materials, one input polarization-maintaining fiber, two transmission polarization-maintaining fibers, four output polarization-maintaining fibers, fiber cutting tools, fiber polishing tools, cleaning supplies, and fiber fusion splicer;

[0007] S2: Fiber preparation: Use fiber cutting tools and fiber polishing tools to cut and polish all optical fibers to form straight and clean end faces, and use cleaning supplies to clean the fiber end faces;

[0008] S3: Fiber fusion splicing: align the polarization axis of the optical fiber, fuse the input polarization-maintaining fiber with the input port of the coupler, and fuse the output polarization-maintaining fiber with the output port of the coupler to obtain a complete polarization-maintaining coupler assembly;

[0009] S4: Check and test, use an optical power meter to check and test the loss of each connection point of the polarization-maintaining coupler assembly;

[0010] S5: Install the housing, install the polarization-maintaining coupler assembly inside the housing, and fix it after determining the position through the adjustment mechanism.

[0011] The present invention also provides a polarization coupler manufactured by the above manufacturing method, comprising a single-tail fiber collimator, wherein a first birefringent crystal and a second birefringent crystal are arranged at one end of the single-tail fiber collimator, a half-wave plate is arranged between the first birefringent crystal and the second birefringent crystal, and the first birefringent crystal is located between the single-tail fiber collimator and the half-wave plate, a prism is arranged at the output end of the second birefringent crystal, a four-tail polarization-maintaining fiber collimator is arranged at the output end of the prism, and a polarization-maintaining fiber is fused to the output end of the single-tail fiber collimator.

[0012] In a preferred embodiment, the polarization-maintaining optical fiber includes an input optical fiber, the output end of the input optical fiber is connected to output optical fiber 1 and output optical fiber 2, and output optical fiber 1 and output optical fiber 2 are both arranged inside a first birefringent crystal, output optical fiber 1 and output optical fiber 2 are arranged to be tilted upward and downward, respectively, and the intersection position of output optical fiber 1 and output optical fiber 2 coincides with the output end position of the input optical fiber, and the output ends of output optical fiber 1 and output optical fiber 2 are connected to a half-wave plate.

[0013] In a preferred embodiment, the output end of output optical fiber one is connected to two-division optical fiber one, and two groups of two-division optical fiber one are arranged, the two groups of two-division optical fiber one are inclined to both sides, and the intersection position of the two groups of two-division optical fiber one coincides with the output end position of output optical fiber one, the output end of output optical fiber two is connected to two-division optical fiber two, and two groups of two-division optical fiber two are arranged, the two groups of two-division optical fiber two are inclined to both sides, and the intersection position of the two groups of two-division optical fiber two coincides with the output end position of output optical fiber two, the two-division optical fiber one and the two-division optical fiber two are both arranged inside the second birefringent crystal, the output ends of the two groups of two-division optical fiber one pass through a prism, cross, and are fused with a four-tail polarization-maintaining fiber collimator, and the output ends of the two groups of two-division optical fiber two pass through a prism, cross, and are fused with a four-tail polarization-maintaining fiber collimator.

[0014] In a preferred embodiment, the adjustment mechanism includes a main horizontal plate located above the shell, a movable seat is slidably mounted on the main horizontal plate, a push plate is slidably mounted on the movable seat, a side component is mounted on the main horizontal plate, and a plurality of groups of side components are arranged corresponding to the connection points on the first birefringent crystal and the second birefringent crystal, the movable seat is used to drive the push plate to slide in the vertical direction of the Z-axis of the main horizontal plate, so that the push plate drives the first birefringent crystal and the second birefringent crystal to move synchronously.

[0015] In a preferred embodiment, the side assembly includes a detection plate, an adjustment plate is provided at the bottom of the detection plate, a detector is mounted on the adjustment plate, an adjustment slot is provided on the adjustment plate, and the detector is slidably arranged along the direction of the adjustment slot.

[0016] In a preferred embodiment, guide columns are fixedly provided at both ends of the detection plate, guide grooves are provided on both sides of the main horizontal plate, and the guide columns are slidably arranged along the direction of the guide grooves.

[0017] In a preferred embodiment, a connecting tooth plate runs through the interior of the movable seat, and a side seat 1 and a hose are respectively provided on both sides of the connecting tooth plate. A side roller is rotatably installed inside the side seat 1, and a driving gear assembly is installed inside the side seat 2.

[0018] In a preferred embodiment, a glue cavity is provided inside the first side seat, a glue tube is connected between the glue cavity and the movable seat, and a glue injection port is provided at the bottom of the movable seat.

[0019] In a preferred embodiment, a linear driver 1 is installed on the main horizontal plate, and the linear driver 1 drives the movable seat to move along the length direction of the main horizontal plate. The push plate is fixedly connected to the connecting tooth plate. A splint is provided inside the push plate for movement. A linear driver 2 is installed on the outer side of the push plate away from the connecting tooth plate. The linear driver 2 is used to push the splint toward or away from the movable seat.

[0020] The beneficial effects of the present invention are:

[0021] The present invention can provide a solution for dividing a beam of light into four beams of linearly polarized parallel light, and a method for coupling the four beams of linearly polarized parallel light with four tail optical fibers, which can effectively reduce the volume of the coupler, realize integrated and lightweight design, and have low cost, thus meeting the miniaturization requirements of modern communication equipment.

[0022] The present invention makes the detector correspond to the birefringent crystal and the connection point on the birefringent crystal by adjustment. At this time, the single-tail optical fiber collimator, the birefringent crystal, the half-wave plate, the birefringent crystal, the prism and the four-tail polarization-maintaining optical fiber collimator are located in the correct position inside the shell, avoiding bending or pulling of the input optical fiber, the output optical fiber 1 and the output optical fiber 2, and ensuring that the input optical fiber, the output optical fiber 1 and the output optical fiber 2 are aligned with the polarization axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the manufacturing method of the present invention.

[0024] Figure 2 It is a schematic top view of the partial coupler structure of the present invention.

[0025] Figure 3 It is a schematic side view of the partial coupler structure of the present invention.

[0026] Figure 4 It is a schematic diagram of the polarization states of four groups of binary optical fibers of the present invention.

[0027] Figure 5 It is a schematic diagram of the cross section of four groups of binary optical fibers of the present invention.

[0028] Figure 6 This is a schematic diagram of installing the polarization-maintaining coupler assembly of the present invention.

[0029] Figure 7It is a schematic diagram of the bottom structure of the main horizontal plate of the present invention.

[0030] Figure 8 It is a schematic diagram of the bottom structure of the detection board of the present invention.

[0031] Fig. 9 It is a schematic top view of the movable seat structure of the present invention.

[0032] Fig.10 It is a schematic top view of the second cross-sectional structure of the side seat of the present invention.

[0033] Fig.11 It is a schematic top view of the cross-sectional structure of the push plate of the present invention.

[0034] The accompanying drawings are marked as follows: 1. single-tail fiber collimator; 2. first birefringent crystal; 3. half-wave plate; 4. second birefringent crystal; 5. prism; 6. four-tail polarization-maintaining fiber collimator; 7. polarization-maintaining fiber; 71. input fiber; 72. output fiber 1; 721. binary fiber 1; 73. output fiber 2; 731. binary fiber 2; 8. housing; 9. main horizontal plate; 91. linear drive 1; 92. detection plate; 93. adjustment plate; 931. adjustment groove; 932. detector; 94. guide column; 95. guide groove; 10. movable seat; 101. connecting tooth plate; 102. side seat 1; 1021. side roller; 1022. glue cavity; 103. side seat 2; 1031. driving gear assembly; 104. rubber hose; 105. glue injection port; 11. push plate; 111. clamping plate; 112. linear drive 2. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0036] Refer to the instruction manual Figure 1 , a method for manufacturing a partial coupler, comprising the following steps:

[0037] S1: Prepare materials, one input polarization-maintaining fiber, two transmission polarization-maintaining fibers, four output polarization-maintaining fibers, fiber cutting tools, fiber polishing tools, cleaning supplies, and fiber fusion splicer;

[0038] S2: Fiber preparation: Use fiber cutting tools and fiber polishing tools to cut and polish all optical fibers to form straight and clean end faces, and use cleaning supplies to clean the fiber end faces;

[0039] S3: Fiber fusion splicing: align the polarization axis of the optical fiber, fuse the input polarization-maintaining fiber with the input port of the coupler, and fuse the output polarization-maintaining fiber with the output port of the coupler to obtain a complete polarization-maintaining coupler assembly;

[0040] S4: Check and test, use an optical power meter to check and test the loss of each connection point of the polarization-maintaining coupler assembly;

[0041] S5: Install the housing, install the polarization-maintaining coupler assembly inside the housing, and fix it after determining the position through the adjustment mechanism.

[0042] It should be noted that polarization-maintaining optical fiber, optical fiber cutting tools, optical fiber polishing tools, cleaning supplies, and optical fiber fusion splicers are all existing mature technologies.

[0043] Refer to the instruction manual Figures 2 to 5 The present invention also provides a polarization coupler manufactured by the above manufacturing method, including a single-tail fiber collimator 1, a first birefringent crystal 2 and a second birefringent crystal 4 are provided at one end of the single-tail fiber collimator 1, a half-wave plate 3 is provided between the first birefringent crystal 2 and the second birefringent crystal 4, and the first birefringent crystal 2 is located between the single-tail fiber collimator 1 and the half-wave plate 3, a prism 5 is provided at the output end of the second birefringent crystal 4, a four-tail polarization-maintaining fiber collimator 6 is provided at the output end of the prism 5, and a polarization-maintaining fiber 7 is fused at the output end of the single-tail fiber collimator 1.

[0044] It should be noted that the prism 5 is a Wollaston prism, the first birefringent crystal 2 and the second birefringent crystal 4 have the same specifications, and are birefringent crystal components whose crystal axis direction is at an angle of 45° to the incident surface. The second birefringent crystal 4 is rotated 90° relative to the first birefringent crystal 2, and the half-wave plate 3 and the second birefringent crystal 4 can be replaced by a birefringent crystal. The specifications of this birefringent crystal are the same as those of the first birefringent crystal 2, and it needs to be rotated 45° relative to the first birefringent crystal 2 when placed. The prism 5 and the four-tail polarization-maintaining fiber collimator 6 can be replaced by a microlens array and a four-tail optical fiber.

[0045] Furthermore, the polarization-maintaining optical fiber 7 includes an input optical fiber 71, the output end of the input optical fiber 71 is connected to an output optical fiber 1 72 and an output optical fiber 2 73, and the output optical fiber 1 72 and the output optical fiber 2 73 are both arranged inside the first birefringent crystal 2, the output optical fiber 1 72 and the output optical fiber 2 73 are arranged to be tilted upward and downward respectively, and the intersection position of the output optical fiber 1 72 and the output optical fiber 2 73 coincides with the output end position of the input optical fiber 71, and the output ends of the output optical fiber 1 72 and the output optical fiber 2 73 are connected to the half-wave plate 3.

[0046] It should be noted that the input optical fiber 71 is divided into an output optical fiber 1 72 and an output optical fiber 2 73 by the first birefringent crystal 2 .

[0047] Furthermore, the output end of the output optical fiber 1 72 is connected to the two-way optical fiber 1 721, and the two-way optical fiber 1 721 is arranged in two groups, the two groups of two-way optical fiber 1 721 are inclined on both sides, and the intersection position of the two groups of two-way optical fiber 1 721 coincides with the output end position of the output optical fiber 1 72, the output end of the output optical fiber 2 73 is connected to the two-way optical fiber 2 731, and the two groups of two-way optical fiber 2 731 are arranged in two groups, the two groups of two-way optical fiber 2 731 are inclined on both sides, and the intersection position of the two groups of two-way optical fiber 2 731 coincides with the output end position of the output optical fiber 2 73, the two-way optical fiber 1 721 and the two-way optical fiber 2 731 are both arranged inside the second birefringent crystal 4, the output ends of the two groups of two-way optical fiber 1 721 pass through the prism 5, cross, and are fused with the four-tail polarization-maintaining fiber collimator 6, and the output ends of the two groups of two-way optical fiber 2 731 pass through the prism 5, cross, and are fused with the four-tail polarization-maintaining fiber collimator 6.

[0048] It should be noted that the output optical fiber 1 72 is divided into two groups of two-branch optical fibers 1 721 , and the output optical fiber 2 73 is divided into two groups of two-branch optical fibers 2 731 by the second birefringent crystal 4 .

[0049] In this embodiment, the implementation scenario is specifically as follows: a beam of light is emitted from the direction of the single-tail fiber collimator 1, and is divided into two beams of linear polarized light with mutually perpendicular polarization directions and mutually parallel propagation directions through the first birefringent crystal 2. Then, after passing through the half-wave plate 3, the polarization directions of the two beams of linear polarized light are rotated by 45°, and then, after passing through the second birefringent crystal 4, the two beams of linear polarized light are respectively divided into two beams of linear polarized light with mutually perpendicular polarization directions and mutually parallel propagation directions, that is, the first birefringent crystal 2 divides the beam of light into two, and the second birefringent crystal 4 divides the beam of light into four. At this time, the propagation directions of the four beams of light are mutually parallel, and the polarization states are as shown in the attached figure. Figure 3 As shown, the propagation directions of the four light beams change after passing through the prism 5, and the four light beams are coupled with the four-tail polarization-maintaining fiber collimator 6 in the form of converging and crossing each other in pairs. The overall scheme can provide a solution for dividing a light beam into four linearly polarized parallel lights, as well as a method for coupling the four linearly polarized parallel lights with the four-tail optical fibers, which can effectively reduce the volume of the coupler and meet the miniaturization requirements of modern communication equipment.

[0050] Refer to the instruction manual Figures 6 to 11 The adjustment mechanism includes a main horizontal plate 9 located above the shell 8, a movable seat 10 is slidably installed on the main horizontal plate 9, a push plate 11 is slidably installed on the movable seat 10, a side component is installed on the main horizontal plate 9, and the side components are arranged in several groups corresponding to the connection points on the first birefringent crystal 2 and the second birefringent crystal 4. The movable seat 10 is used to drive the push plate 11 to slide along the Z-axis vertical direction of the main horizontal plate 9, so that the push plate 11 drives the first birefringent crystal 2 and the second birefringent crystal 4 to move synchronously.

[0051] It should be noted that the polarization-maintaining coupler assembly is installed inside the housing 8 , and the main transverse plate 9 is located above the housing 8 . The main transverse plate 9 is driven to move vertically by a cylinder.

[0052] Furthermore, the side assembly includes a detection plate 92 , an adjustment plate 93 is provided at the bottom of the detection plate 92 , a detector 932 is mounted on the adjustment plate 93 , an adjustment slot 931 is provided on the adjustment plate 93 , and the detector 932 is slidably arranged along the direction of the adjustment slot 931 .

[0053] It should be noted that the detector 932 is slidably adjusted along the Z-axis direction of the main horizontal plate 9 by adjusting the groove 931 .

[0054] Furthermore, guide posts 94 are fixedly provided at both ends of the detection plate 92 , and guide grooves 95 are provided on both sides of the main transverse plate 9 , and the guide posts 94 are slidably arranged along the direction of the guide grooves 95 .

[0055] It should be noted that the detector 932 is slidably adjusted along the X-axis direction of the main horizontal plate 9 by means of the guide column 94 and the guide groove 95, and the ultimate goal is to make the detector 932 correspond to the connection points on the first birefringent crystal 2 and the second birefringent crystal 4.

[0056] Furthermore, a connecting tooth plate 101 runs through the interior of the movable seat 10, and a side seat 102 and a hose 104 are respectively provided on both sides of the connecting tooth plate 101. A side roller 1021 is rotatably installed inside the side seat 102, and a driving gear assembly 1031 is installed inside the side seat 2 103.

[0057] It should be noted that the side of the connecting tooth plate 101 corresponding to the side seat 2 103 is provided with a rack plate, and the driving gear assembly 1031 includes a motor and a gear, and the gear is meshed with the rack plate, thereby driving the connecting tooth plate 101 to move, and the side roller 1021 abuts against the other side of the connecting tooth plate 101.

[0058] Furthermore, a glue cavity 1022 is provided inside the first side seat 102 , a glue tube 104 is connected between the glue cavity 1022 and the movable seat 10 , and a glue injection port 105 is provided at the bottom of the movable seat 10 .

[0059] It should be noted that a glue pump is provided inside the side seat 102 to transport the adhesive inside the glue cavity 1022 to the inside of the movable seat 10 through the glue hose 104 and drip the adhesive onto the sides of the first birefringent crystal 2 and the second birefringent crystal 4 through the glue injection port 105 .

[0060] Furthermore, a linear driver 91 is installed on the main cross plate 9, and the linear driver 91 drives the movable seat 10 to move along the length direction of the main cross plate 9. The push plate 11 is fixedly connected to the connecting tooth plate 101. The push plate 11 is internally movable and provided with a splint 111. A linear driver 112 is installed on the outer side of the push plate 11 away from the connecting tooth plate 101. The linear driver 112 is used to push the splint 111 toward or away from the movable seat 10.

[0061] It should be noted that the second linear driver 112 pushes the clamp 111 out to make the clamp 111 abut against the side of the first birefringent crystal 2 or the second birefringent crystal 4 , and the first birefringent crystal 2 or the second birefringent crystal 4 is driven to move synchronously by the first linear driver 91 .

[0062] In this embodiment, the implementation scenario is specifically as follows: the polarization-maintaining coupler assembly is installed inside the housing 8, and the detector 932 is slidably adjusted in the Z-axis direction of the main transverse plate 9 through the adjustment groove 931, and the detector 932 is slidably adjusted in the X-axis direction of the main transverse plate 9 through the guide column 94 and the guide groove 95, so that the detector 932 corresponds to the connection point on the first birefringent crystal 2 and the second birefringent crystal 4. When the connection point between the detector 932 and the first birefringent crystal 2 and the second birefringent crystal 4 is offset, the connecting gear plate 101 is driven to move to one end through the driving gear assembly 1031, so that the push plate 11 at one end pushes the corresponding first birefringent crystal 2 or half-wave plate 3 from the side to move and adjust the position. The adjustment direction is the Z-axis direction of the main transverse plate 9, and the linear drive is used. The second device 112 pushes out the clamp 111, so that the clamp 111 abuts against the side of the first birefringent crystal 2 or the second birefringent crystal 4 and clamps it, and the first birefringent crystal 2 or the second birefringent crystal 4 is driven by the linear driver 1 91 to synchronously move and adjust the position, and the adjustment direction is the X-axis direction of the main horizontal plate 9. After adjustment, the detector 932 corresponds to the connection point on the first birefringent crystal 2 and the second birefringent crystal 4. At this time, the single-tail fiber collimator 1, the first birefringent crystal 2, the half-wave plate 3, the second birefringent crystal 4, the prism 5 and the four-tail polarization-maintaining fiber collimator 6 are located in the correct position inside the housing 8, avoiding bending or pulling of the input optical fiber 71, the output optical fiber 1 72 and the output optical fiber 2 73, ensuring that the input optical fiber 71, the output optical fiber 1 72 and the output optical fiber 2 73 are aligned with the polarization axis.

[0063] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A method for manufacturing a partial coupler, characterized in that: The steps include: S1: Prepare materials, one input polarization-maintaining fiber, two transmission polarization-maintaining fibers, four output polarization-maintaining fibers, fiber cutting tools, fiber polishing tools, cleaning supplies, and fiber fusion splicer; S2: Fiber preparation: Use fiber cutting tools and fiber polishing tools to cut and polish all optical fibers to form straight and clean end faces, and use cleaning supplies to clean the fiber end faces; S3: Fiber fusion splicing: align the polarization axis of the optical fiber, fuse the input polarization-maintaining fiber with the input port of the coupler, and fuse the output polarization-maintaining fiber with the output port of the coupler to obtain a complete polarization-maintaining coupler assembly; S4: Check and test, use an optical power meter to check and test the loss of each connection point of the polarization-maintaining coupler assembly; S5: Install the housing, install the polarization-maintaining coupler assembly inside the housing, and fix it after determining the position through the adjustment mechanism.

2. A partial coupler manufactured by the method for manufacturing a partial coupler according to claim 1, characterized in that: The invention comprises a single-tail optical fiber collimator (1), wherein a first birefringent crystal (2) and a second birefringent crystal (4) are arranged at one end of the single-tail optical fiber collimator (1), a half-wave plate (3) is arranged between the first birefringent crystal (2) and the second birefringent crystal (4), and the first birefringent crystal (2) is located between the single-tail optical fiber collimator (1) and the half-wave plate (3), a prism (5) is arranged at the output end of the second birefringent crystal (4), a four-tail polarization-maintaining optical fiber collimator (6) is arranged at the output end of the prism (5), and a polarization-maintaining optical fiber (7) is fused to the output end of the single-tail optical fiber collimator (1).

3. A partial coupler according to claim 2, characterized in that: The polarization-maintaining optical fiber (7) comprises an input optical fiber (71), the output end of the input optical fiber (71) is connected to an output optical fiber 1 (72) and an output optical fiber 2 (73), and the output optical fiber 1 (72) and the output optical fiber 2 (73) are both arranged inside a first birefringent crystal (2), the output optical fiber 1 (72) and the output optical fiber 2 (73) are arranged to tilt upward and downward respectively, and the intersection position of the output optical fiber 1 (72) and the output optical fiber 2 (73) coincides with the output end position of the input optical fiber (71), and the output ends of the output optical fiber 1 (72) and the output optical fiber 2 (73) are connected to a half-wave plate (3).

4. A partial coupler according to claim 3, characterized in that: The output end of the output optical fiber 1 (72) is connected to the two-branch optical fiber 1 (721), and the two-branch optical fiber 1 (721) is provided with two groups, the two groups of the two-branch optical fiber 1 (721) are inclined to both sides, and the intersection position of the two groups of the two-branch optical fiber 1 (721) coincides with the output end position of the output optical fiber 1 (72), the output end of the output optical fiber 2 (73) is connected to the two-branch optical fiber 2 (731), and the two groups of the two-branch optical fiber 2 (731) are provided with two groups, and the two groups of the two-branch optical fiber 2 (731) are inclined to both sides , and the intersection position of the two groups of two-way optical fiber 2 (731) coincides with the output end position of the output optical fiber 2 (73); the two-way optical fiber 1 (721) and the two-way optical fiber 2 (731) are both arranged inside the second birefringent crystal (4); the output ends of the two groups of two-way optical fiber 1 (721) pass through the prism (5) to cross and are fused with the four-tail polarization-maintaining optical fiber collimator (6); the output ends of the two groups of two-way optical fiber 2 (731) pass through the prism (5) to cross and are fused with the four-tail polarization-maintaining optical fiber collimator (6).

5. A partial coupler according to claim 4, characterized in that: The adjustment mechanism comprises a main transverse plate (9) located above the housing (8); a movable seat (10) is slidably mounted on the main transverse plate (9); a push plate (11) is slidably mounted on the movable seat (10); a side assembly is mounted on the main transverse plate (9); and a plurality of groups of side assemblies are arranged corresponding to connection points on the first birefringent crystal (2) and the second birefringent crystal (4); the movable seat (10) is used to drive the push plate (11) to slide along the Z-axis vertical direction of the main transverse plate (9), so that the push plate (11) drives the first birefringent crystal (2) and the second birefringent crystal (4) to move synchronously.

6. A partial coupler according to claim 5, characterized in that: The side position component comprises a detection plate (92), an adjustment plate (93) is provided at the bottom of the detection plate (92), a detector (932) is installed on the adjustment plate (93), an adjustment slot (931) is provided on the adjustment plate (93), and the detector (932) is slidably arranged along the direction of the adjustment slot (931).

7. A partial coupler according to claim 6, characterized in that: Guide columns (94) are fixedly provided at both ends of the detection plate (92), guide grooves (95) are provided on both sides of the main transverse plate (9), and the guide columns (94) are slidably arranged along the direction of the guide grooves (95).

8. A partial coupler according to claim 7, characterized in that: A connecting tooth plate (101) is passed through the interior of the movable seat (10), and a side seat 1 (102) and a rubber hose (104) are respectively provided on both sides of the connecting tooth plate (101). A side roller (1021) is rotatably installed inside the side seat 1 (102), and a driving gear assembly (1031) is installed inside the side seat 2 (103).

9. A partial coupler according to claim 8, characterized in that: A glue cavity (1022) is provided inside the side seat (102), a glue tube (104) is connected between the glue cavity (1022) and the movable seat (10), and a glue injection port (105) is provided at the bottom of the movable seat (10).

10. A partial coupler according to claim 9, characterized in that: A linear driver 1 (91) is installed on the main transverse plate (9), and the linear driver 1 (91) drives the movable seat (10) to move along the length direction of the main transverse plate (9). The push plate (11) is fixedly connected to the connecting tooth plate (101), and a clamping plate (111) is movably provided inside the push plate (11). A linear driver 2 (112) is installed on the outer side of the push plate (11) away from the connecting tooth plate (101), and the linear driver 2 (112) is used to push the clamping plate (111) towards or away from the movable seat (10).

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