A high-precision optical fiber coupling parallel alignment method

Abstract

The application discloses a high-precision optical fiber coupling parallel alignment method, which is realized by an automatic optical fiber coupling parallel alignment device and comprises the following steps: S1, fixing and mounting an output optical fiber on a first optical fiber clamp of a first electrically-adjusted support and fixing and mounting a receiving optical fiber on a second optical fiber clamp of a second electrically-adjusted support, so that the bottom surface and the side surface of the output optical fiber are in full contact with the bottom surface contact surface and the side surface contact surface of the first optical fiber clamp respectively and are parallel to each other. The high-precision optical fiber coupling parallel alignment method disclosed by the application eliminates manual leveling alignment, improves the automation efficiency and leveling quality, and solves the precision and efficiency problems of the existing manual high-precision leveling frame; and the method avoids multiple end surface rubbing, improves the coupling efficiency, and solves the end surface rubbing problem of the automatic optical fiber leveling frame.

Description

Technical Field

[0001] This invention belongs to the field of optical waveguide chip detection technology, specifically relating to a high-precision optical fiber coupling parallel alignment method. Background Technology

[0002] In the field of optical fiber communication, various passive optical devices manufactured based on optical waveguide technology have wide applications in ultra-high-speed transmission of optical communication backbone networks. During testing, optical waveguide chips are evaluated primarily based on three optical performance indicators: insertion loss, uniformity of multi-path output power, and polarization variation loss. Therefore, the mating coupling between the optical waveguide chip and the optical fiber directly affects the accuracy of these three parameters during testing. To accurately assess the quality of discrete components such as optical waveguides and fiber arrays, external factors such as the alignment error between the optical axis of the optical waveguide chip and the optical fiber must be minimized, ideally within a range of 0.1 micrometers.

[0003] Traditional fiber optic coupling alignment systems utilize high-precision adjustment frames and employ manual leveling operations. Manual leveling is a complex and time-consuming process, requiring highly skilled operators and exhibiting low repeatability and reliability of test data, thus limiting the coupling efficiency between the optical waveguide chip and the optical fiber.

[0004] In addition, existing automatic fiber optic coupling parallel devices are all based on changing the displacement sensor value by multiple collisions between the optical waveguide chip and the optical fiber. This method will cause multiple frictions between the 8° inclined end faces, thereby reducing the coupling efficiency between the optical waveguide chip and the optical fiber.

[0005] Therefore, further improvements will be made to address the aforementioned issues. Summary of the Invention

[0006] The main objective of this invention is to provide a high-precision optical fiber coupling parallel alignment method that eliminates manual leveling alignment, improves automation efficiency and leveling quality, thereby solving the accuracy and efficiency problems of existing manual high-precision leveling frames; and avoids multiple frictions on the end face, improving coupling efficiency, thereby solving the end face friction problem of automatic optical fiber leveling frames.

[0007] To achieve the above objectives, this invention provides a high-precision fiber-coupled parallel alignment method, implemented using an automatic fiber-coupled parallel alignment device, comprising the following steps:

[0008] Step S1: Fix the output optical fiber to the first optical fiber clamp located on the first electric (six-axis) adjustment bracket and fix the receiving optical fiber to the second optical fiber clamp located on the second electric (six-axis) adjustment bracket, so that the bottom and side surfaces of the output optical fiber are in complete contact with the bottom and side contact surfaces of the first optical fiber clamp and are parallel, respectively, and the bottom and side surfaces of the receiving optical fiber are in complete contact with the bottom and side contact surfaces of the second optical fiber clamp and are parallel, respectively; keep the second electric adjustment bracket fixed, and adjust the first electric adjustment bracket according to the parameters of the second electric adjustment bracket to make the output optical fiber and the receiving optical fiber parallel, thereby judging the fiber loss (after the light output by the output optical fiber is received by the receiving optical fiber, the fiber loss is judged by a power meter to prevent errors in the subsequent channel loss detection of the optical waveguide chip; alternatively, keep the first electric adjustment bracket fixed and adjust the second electric adjustment bracket).

[0009] Step S2: Install the optical waveguide chip test stage between the first fiber optic clamp and the second fiber optic clamp, and fix the optical waveguide chip to be tested on the optical waveguide chip test stage. Adjust the first and second electric adjustment brackets according to the feedback values ​​of their respective laser coaxial displacement sensors so that the sides of the first and second fiber optic clamps are parallel to the sides of the optical waveguide chip test stage, so that the output fiber and the receiving fiber are parallel to the channel of the optical waveguide chip, thereby detecting and judging the channel loss of the optical waveguide chip.

[0010] As a further preferred embodiment of the above technical solution, in step S1, both the first fiber optic clamp and the second fiber optic clamp include a fiber placement slot, a spring cover plate, and a bolt knob, wherein:

[0011] When placing (output / receive) optical fibers, the spring cover plate is stretched to place the optical fiber in the optical fiber placement slot. After the spring cover plate is released, the stretched spring cover plate provides a downward force and presses down on the optical fiber through the middle protrusion so that the bottom surface of the optical fiber is in complete contact with the bottom surface of the optical fiber placement slot.

[0012] Adjusting the size of the fiber placement slot by adjusting the screw knob applies force to the side of the fiber, ensuring that the side of the fiber is in complete contact with the side contact surface of the fiber placement slot.

[0013] As a further preferred technical solution to the above technical solution, in step S2, for the installation of the optical waveguide chip, the optical waveguide chip test stage is provided with adsorption vents (preferably two) and grippers (preferably two), wherein:

[0014] The optical waveguide chip is placed in the adsorption pore, and the air pump connected to the adsorption pore adsorbs and fixes the optical waveguide chip so that the bottom surface of the optical waveguide chip is in complete contact with the optical waveguide chip test stage and parallel.

[0015] The gripper is kept at the same horizontal position as the optical waveguide chip test stage. The opening and closing of the gripper is operated by the pressure value of the internal cylinder so that the coupling end face on the side of the optical waveguide chip can be parallel to the side of the optical waveguide chip test stage.

[0016] As a further preferred technical solution to the above technical solution, the adjustment of the first electric adjusting bracket and the second electric adjusting bracket in step S2 includes:

[0017] Three laser coaxial displacement sensors are installed on the sides of the first and second fiber optic clamps near the optical waveguide chip test stage, respectively, and are placed at the three corners. Each laser coaxial displacement sensor measures the distance from the side of the fiber optic clamp to the side of the optical waveguide chip test stage. The first and second electric adjustment brackets are adjusted so that the feedback values ​​of the three laser coaxial displacement sensors are the same or the differences between each pair are within a certain threshold range, thereby ensuring that the side of the fiber optic clamp is parallel to the side of the optical waveguide chip test stage.

[0018] As a further preferred embodiment of the above technical solution, in step S2, the three laser coaxial displacement sensors are laser coaxial displacement sensor A, laser coaxial displacement sensor B, and laser coaxial displacement sensor C, specifically implemented as follows:

[0019] The measurement distance of laser coaxial displacement sensor A is represented by dashed line a, the measurement distance of laser coaxial displacement sensor B is represented by dashed line b, and the measurement distance of laser coaxial displacement sensor C is represented by dashed line c.

[0020] The positional state between the (first / second) fiber optic clamp and the optical waveguide chip test stage is determined by reading the values ​​a, b, and c of the laser coaxial displacement sensors. This allows for the adjustment of the X-axis (vertical) and Y-axis (front / back) of the (first / second) electric adjustment frame, ensuring that the values ​​a, b, and c of the three laser coaxial displacement sensors are all within their measurement range.

[0021] If a > range, b or c ≦ range: This indicates that the two are not aligned vertically, and need to be adjusted in the negative X-axis direction so that the value of the laser coaxial displacement sensor A is within the range.

[0022] If a≦range, and b and c both>range: it means that their vertical positions are not aligned, and they need to be adjusted in the positive X-axis direction so that the values ​​of laser coaxial displacement sensors B and C are within the range.

[0023] If a and b are less than or equal to the range, and c is greater than the range, it means that the two are not aligned. In this case, they need to be adjusted in the positive Y-axis direction so that the value of the laser coaxial displacement sensor C is within the range.

[0024] If a and b > range, and c ≦ range, it means that the two are not aligned. In this case, it is necessary to adjust them in the negative Y-axis direction so that the values ​​of laser coaxial displacement sensors A or B are within the range.

[0025] As a further preferred technical solution of the above technical solution, in step S2, the first electric adjustment bracket and the second electric adjustment bracket are adjusted to make the end faces parallel, and the θx and θy axes are adjusted so that the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage.

[0026] If the two are not in a parallel state, the values ​​of laser coaxial displacement sensors A, B, and C will not be equal.

[0027] If the θx axis direction is leveled, that is, when the fiber optic clamp and the front view of the optical waveguide chip test stage are on the same plane, the value b of the laser coaxial displacement sensor B is equal to the value c of the laser coaxial displacement sensor C (b==c).

[0028] If the θy axis direction is leveled, that is, when the fiber optic clamp and the bottom surface of the optical waveguide chip test platform are on the same plane, the value a of laser coaxial displacement sensor A is equal to the value b of laser coaxial displacement sensor B (a==b).

[0029] When the values ​​a, b, and c of the laser coaxial displacement sensors A, B, and C are all equal, the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage, that is, the end face of the fiber optic cable is completely parallel and aligned with the end face of the optical waveguide chip. (During the test, the current position and angle are judged by the values ​​of the three laser coaxial displacement sensors, the electric adjustment bracket is continuously adjusted, and the displacement sensor data is fed back in real time until the values ​​of a, b, and c are equal or the difference between any two is within a certain threshold range, which is considered as the fiber optic cable being completely parallel to the end face of the optical waveguide chip.)

[0030] The beneficial effects of this invention are as follows:

[0031] 1. This invention uses fiber optic clamps and test stage clamps to make the fiber optic cable, waveguide chip and clamp completely parallel. It transforms the 8° oblique parallelism between the fiber optic cable and waveguide chip into parallelism between the fiber optic clamp and the side of the test stage. Therefore, by placing a high-precision displacement sensor on the side of the clamp to measure the distance between the two, the parallelism between the end face of the fiber optic cable and the waveguide chip can be effectively determined. Compared with manual leveling, it has good accuracy and repeatability.

[0032] 2. Currently widely used fiber optic automatic leveling methods involve mounting a displacement sensor at the rear end of the fiber optic clamp and aligning the fiber and chip to contact at their end faces. By continuously adjusting the positions and angles of the six-axis adjustment frame, pressure is applied to the contact surface, causing changes in the displacement sensor readings. When the change falls within a certain threshold range, it indicates that the two devices have been leveled and aligned. Compared to traditional automatic leveling methods, the leveling and alignment method used in this invention effectively avoids end-face friction during testing, as seen in other fiber optic automatic leveling devices, thereby improving testing and coupling efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the automatic fiber optic coupling parallel alignment device of the present invention.

[0034] Figure 2 This is a schematic diagram of the optical waveguide chip test station of the present invention.

[0035] Figure 3 This is a flowchart of the optical fiber coupling parallel alignment method of the present invention.

[0036] Figure 4 This is a schematic diagram of the installation of the three laser coaxial displacement sensors of the present invention, as well as a sensor measurement diagram.

[0037] Figure 5 This is a simplified schematic diagram of eight states where the fiber optic end faces are not parallel and the sensor measurement values ​​of the present invention.

[0038] The reference numerals in the attached drawings include: 10, output optical fiber; 20, receiving optical fiber; 30, first electric adjustment bracket; 40, second electric adjustment bracket; 50, first optical fiber clamp; 51, optical fiber placement slot; 52, spring cover plate; 53, bolt knob; 54, laser coaxial displacement sensor; 60, second optical fiber clamp; 70, optical waveguide chip test stage; 71, adsorption vent; 72, air gripper. Detailed Implementation

[0039] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0040] In the preferred embodiments of the present invention, those skilled in the art should note that the optical waveguide chips and the like involved in the present invention can be considered as prior art.

[0041] Preferred embodiment.

[0042] Since the size of optical waveguide devices is typically less than 1 μm, and the core size is approximately 10 μm, a mismatch in refractive index or a significant difference in size between the optical fiber and the waveguide device can easily lead to mode mismatch, resulting in radiation modes and back reflections, and thus significant insertion loss. To address these issues, this application presents a high-precision automatic optical fiber coupling parallel alignment method, which, compared to existing manual adjustment methods and automatic end-face collision adjustment methods, features high efficiency and low insertion loss.

[0043] This invention discloses a high-precision fiber optic coupling parallel alignment method, implemented using an automatic fiber optic coupling parallel alignment device. The automatic fiber optic coupling parallel alignment device includes a first fiber optic clamp 50, a second fiber optic clamp 60, a first electrically adjustable support 30, a second electrically adjustable support 40, and an optical waveguide chip test stage 70. The method includes the following steps:

[0044] Step S1: Fix the output fiber 10 to the first fiber clamp 50 located on the first electric (six-axis) adjustment bracket 30 and fix the receiving fiber 20 to the second fiber clamp 60 located on the second electric (six-axis) adjustment bracket 40, so that the bottom and side surfaces of the output fiber 10 are in complete contact with the bottom and side contact surfaces of the first fiber clamp 50 and are parallel, and the bottom and side surfaces of the receiving fiber 20 are in complete contact with the bottom and side contact surfaces of the second fiber clamp 60 and are parallel; keep the second electric adjustment bracket 40 fixed, and adjust the first electric adjustment bracket 30 according to the parameters of the second electric adjustment bracket 40 to make the output fiber and the receiving fiber parallel, thereby judging the fiber loss (after the light output by the output fiber is received by the receiving fiber, the fiber loss is judged by a power meter to prevent errors in the subsequent detection of the channel loss of the optical waveguide chip; alternatively, keep the first electric adjustment bracket fixed and adjust the second electric adjustment bracket).

[0045] Step S2: Install the optical waveguide chip test stage 70 between the first fiber optic clamp 50 and the second fiber optic clamp 60, and fix the optical waveguide chip to be tested on the optical waveguide chip test stage 70. Adjust the first electric adjustment bracket 30 and the second electric adjustment bracket 40 according to the feedback values ​​of their respective laser coaxial displacement sensors 54, so that the side of the first fiber optic clamp 50 and the side of the second fiber optic clamp 60 are parallel to the side of the optical waveguide chip test stage 70, so that the output fiber and the receiving fiber are parallel to the channel of the optical waveguide chip, and then detect and judge the channel loss of the optical waveguide chip.

[0046] Specifically, in step S1, both the first fiber clamp 50 and the second fiber clamp 60 include a fiber placement slot 51, a spring cover plate 52, and a bolt knob 53, wherein:

[0047] When placing (output / receive) optical fiber, the spring cover plate 52 is stretched to place the optical fiber in the optical fiber placement slot 51. After the spring cover plate 52 is released, the stretched spring cover plate 52 provides a downward force and presses down on the optical fiber through the middle protrusion so that the bottom surface of the optical fiber is in complete contact with the bottom surface of the optical fiber placement slot 51.

[0048] Adjusting the size of the fiber placement slot 51 by adjusting the screw knob 53 applies force to the side of the fiber so that the side of the fiber is in complete contact with the side contact surface of the fiber placement slot 51.

[0049] More specifically, in step S2, for the installation of the optical waveguide chip, the optical waveguide chip test stage 70 is provided with adsorption vents 71 (preferably two) and grippers 72 (preferably two), wherein:

[0050] The optical waveguide chip is placed in the adsorption vent 71, and the air pump connected to the adsorption vent 71 adsorbs and fixes the optical waveguide chip so that the bottom surface of the optical waveguide chip is in complete contact with the optical waveguide chip test stage 70 and parallel.

[0051] The pneumatic gripper 72 is kept at the same horizontal position as the optical waveguide chip test stage 70. The opening and closing of the pneumatic gripper 72 is operated by the pressure value of the internal cylinder so that the coupling end face of the optical waveguide chip can be parallel to the side of the optical waveguide chip test stage 70.

[0052] Furthermore, in step S2, the adjustment of the first electrically adjustable bracket 30 and the second electrically adjustable bracket 40 includes:

[0053] Three laser coaxial displacement sensors 54 are provided on the sides of the first fiber optic clamp 50 and the second fiber optic clamp 60 near the optical waveguide chip test stage 70, and are placed at the three corners respectively. Each laser coaxial displacement sensor 54 measures the distance from the side of the fiber optic clamp to the side of the optical waveguide chip test stage 70. The first electric adjustment bracket 30 and the second electric adjustment bracket 40 are adjusted so that the feedback values ​​of the three laser coaxial displacement sensors 54 are the same or the difference between each pair is within a certain threshold range, thereby ensuring that the side of the fiber optic clamp is parallel to the side of the optical waveguide chip test stage.

[0054] Preferably, after the first fiber optic clamp 50 and the second fiber optic clamp 60 on the left and right sides have fixed their respective optical fibers, the requirement for parallel alignment of the optical fibers at an 8° angle on both sides can be transferred to the parallel alignment of the sides of the fiber optic clamps. Three laser coaxial displacement sensors on the sides of the fiber optic clamps can emit lasers to provide feedback on the distance from the sensor's emitting end face to the obstacle in front. Figure 2The three laser coaxial displacement sensors shown are placed at the three corners of the fiber optic fixture. These sensors measure the distance from each corner to the side of the front waveguide chip test stage. Figure 3 As shown. If the two sides are not parallel, the feedback values ​​of the three laser coaxial displacement sensors will differ significantly; if the feedback values ​​of the three laser coaxial displacement sensors 4 are the same or the differences between any two are within a certain threshold range, then the two sides can be considered to be completely parallel. Therefore, the placement method of the optical coaxial displacement sensor can make the side of the fiber optic clamp parallel to the side of another fiber optic clamp or the side of the optical waveguide chip test stage.

[0055] Furthermore, in step S2, the three laser coaxial displacement sensors are laser coaxial displacement sensor A, laser coaxial displacement sensor B, and laser coaxial displacement sensor C, specifically implemented as follows:

[0056] The measurement distance of laser coaxial displacement sensor A is represented by dashed line a, the measurement distance of laser coaxial displacement sensor B is represented by dashed line b, and the measurement distance of laser coaxial displacement sensor C is represented by dashed line c.

[0057] The positional state between the (first / second) fiber optic clamp and the optical waveguide chip test stage is determined by reading the values ​​a, b, and c of the laser coaxial displacement sensors. This allows for the adjustment of the X-axis (vertical) and Y-axis (front / back) of the (first / second) electric adjustment frame, ensuring that the values ​​a, b, and c of the three laser coaxial displacement sensors are all within their measurement range.

[0058] If a > range, b or c ≦ range: This indicates that the two are not aligned vertically, and need to be adjusted in the negative X-axis direction so that the value of the laser coaxial displacement sensor A is within the range.

[0059] If a≦range, and b and c both>range: it means that their vertical positions are not aligned, and they need to be adjusted in the positive X-axis direction so that the values ​​of laser coaxial displacement sensors B and C are within the range.

[0060] If a and b are less than or equal to the range, and c is greater than the range, it means that the two are not aligned. In this case, they need to be adjusted in the positive Y-axis direction so that the value of the laser coaxial displacement sensor C is within the range.

[0061] If a and b > range, and c ≦ range, it means that the two are not aligned. In this case, it is necessary to adjust them in the negative Y-axis direction so that the values ​​of laser coaxial displacement sensors A or B are within the range.

[0062] Preferably, in step S2, the first electric adjustment bracket and the second electric adjustment bracket are adjusted to make the end faces parallel, and the θx and θy axes are adjusted so that the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage.

[0063] If the two are in a non-parallel state, the values of laser coaxial displacement sensors A, B and C are all unequal;

[0064] When the θx axis is leveled, that is, when the fiber fixture is on the same plane as the front view surface of the optical waveguide chip testing table, the value b of laser coaxial displacement sensor B is equal to the value c of laser coaxial displacement sensor C (b==c);

[0065] When the θy axis is leveled, that is, when the fiber fixture is on the same plane as the top surface of the optical waveguide chip testing table, the value a of laser coaxial displacement sensor A is equal to the value b of laser coaxial displacement sensor B (a==b);

[0066] The adjustment directions of the electric adjustment bracket are as follows:

[0067] If a<b&b=c: the θx axis is already leveled, and the θy axis needs to be moved in the negative direction until a==b;

[0068] If a>b&b=c: the θx axis is already leveled, and the θy axis needs to be moved in the positive direction until a==b;

[0069] If a=b&b<c: the θy axis is already leveled, and the θx axis needs to be moved in the positive direction until b==c;

[0070] If a=b&b>c: the θy axis is already leveled, and the θx axis needs to be moved in the negative direction until b==c;

[0071] If a<b&b>c: the θy axis needs to be moved in the negative direction and the θx axis needs to be moved in the negative direction until a==b==c;

[0072] If a>b&b>c: the θy axis needs to be moved in the positive direction and the θx axis needs to be moved in the negative direction until a==b==c;

[0073] If a>b&b<c: the θy axis needs to be moved in the positive direction and the θx axis needs to be moved in the positive direction until a==b==c;

[0074] If a<b&b<c: the θy axis needs to be moved in the negative direction and the θx axis needs to be moved in the positive direction until a==b==c.

[0075] When the values ​​a, b, and c of the laser coaxial displacement sensors A, B, and C are all equal, the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage, that is, the end face of the fiber optic cable is completely parallel and aligned with the end face of the optical waveguide chip. (During the test, the current position and angle are judged by the values ​​of the three laser coaxial displacement sensors, the electric adjustment bracket is continuously adjusted, and the displacement sensor data is fed back in real time until the values ​​of a, b, and c are equal or the difference between any two is within a certain threshold range, which is considered as the fiber optic cable being completely parallel to the end face of the optical waveguide chip.)

[0076] It is worth mentioning that the technical features such as the optical waveguide chip involved in this patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated in detail.

[0077] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A high-precision fiber-coupled parallel alignment method, implemented using an automatic fiber-coupled parallel alignment device, characterized in that, Includes the following steps: Step S1: Fix the output optical fiber to the first optical fiber clamp located on the first electric adjustment bracket and fix the receiving optical fiber to the second optical fiber clamp located on the second electric adjustment bracket, so that the bottom and side surfaces of the output optical fiber are in complete contact with the bottom and side contact surfaces of the first optical fiber clamp and are parallel, respectively, and the bottom and side surfaces of the receiving optical fiber are in complete contact with the bottom and side contact surfaces of the second optical fiber clamp and are parallel, respectively; keep the second electric adjustment bracket fixed, and adjust the first electric adjustment bracket according to the parameters of the second electric adjustment bracket to make the output optical fiber and the receiving optical fiber parallel, thereby determining the optical fiber loss; Step S2: Install the optical waveguide chip test stage between the first fiber clamp and the second fiber clamp, and fix the optical waveguide chip to be tested on the optical waveguide chip test stage. Adjust the first electric adjustment bracket and the second electric adjustment bracket according to the feedback values ​​of their respective laser coaxial displacement sensors, so that the sides of the first fiber clamp and the second fiber clamp are parallel to the sides of the optical waveguide chip test stage, so that the output fiber and the receiving fiber are parallel to the channel of the optical waveguide chip, and then detect and judge the channel loss of the optical waveguide chip. In step S2, for the installation of the optical waveguide chip, the optical waveguide chip test stage is equipped with adsorption vents and grippers, wherein: The optical waveguide chip is placed in the adsorption pore, and the air pump connected to the adsorption pore adsorbs and fixes the optical waveguide chip so that the bottom surface of the optical waveguide chip is in complete contact with the optical waveguide chip test stage and parallel. The gripper is kept at the same horizontal position as the optical waveguide chip test stage. The opening and closing of the gripper is operated by the pressure value of the internal cylinder so that the coupling end face of the optical waveguide chip can be parallel to the side of the optical waveguide chip test stage. In step S2, the adjustment of the first electric adjusting bracket and the second electric adjusting bracket includes: Three laser coaxial displacement sensors are installed on the sides of the first and second fiber optic clamps near the optical waveguide chip test stage, respectively, and are placed at the three corners. Each laser coaxial displacement sensor measures the distance from the side of the fiber optic clamp to the side of the optical waveguide chip test stage. The first and second electric adjustment brackets are adjusted so that the feedback values ​​of the three laser coaxial displacement sensors are the same or the differences between each pair are within a certain threshold range, thereby ensuring that the side of the fiber optic clamp is parallel to the side of the optical waveguide chip test stage.

2. The high-precision fiber optic coupling parallel alignment method according to claim 1, characterized in that, In step S1, both the first fiber clamp and the second fiber clamp include a fiber placement slot, a spring cover plate, and a bolt knob, wherein: When placing the optical fiber, the upper cover of the spring is stretched to place the optical fiber in the optical fiber placement slot. After the upper cover of the spring is released, the stretched upper cover of the spring provides a downward force and presses down on the optical fiber through the middle protrusion so that the bottom surface of the optical fiber is in complete contact with the bottom surface of the optical fiber placement slot. Adjusting the size of the fiber placement slot by adjusting the screw knob applies force to the side of the fiber, ensuring that the side of the fiber is in complete contact with the side contact surface of the fiber placement slot.

3. The high-precision fiber optic coupling parallel alignment method according to claim 1, characterized in that, In step S2, the three laser coaxial displacement sensors are laser coaxial displacement sensor A, laser coaxial displacement sensor B, and laser coaxial displacement sensor C, specifically implemented as follows: The measurement distance of laser coaxial displacement sensor A is represented by dashed line a, the measurement distance of laser coaxial displacement sensor B is represented by dashed line b, and the measurement distance of laser coaxial displacement sensor C is represented by dashed line c. The positional state between the fiber optic clamp and the optical waveguide chip test stage is determined by reading the values ​​a, b, and c from the laser coaxial displacement sensors. This allows for adjustment of the X and Y axes of the motorized adjustment frame, ensuring that the values ​​a, b, and c from the three laser coaxial displacement sensors are all within their measurement ranges. If a > range, and b or c ≦ range: it means that the two are not aligned vertically, and need to be adjusted in the negative X-axis direction so that the value of the laser coaxial displacement sensor A is within the range. If a≦range, and b and c both>range: it means that their vertical positions are not aligned, and they need to be adjusted in the positive X-axis direction so that the values ​​of laser coaxial displacement sensors B and C are within the range. If a and b are less than or equal to the range, and c is greater than the range, it means that the two are not aligned. In this case, they need to be adjusted in the positive Y-axis direction so that the value of the laser coaxial displacement sensor C is within the range. If a and b > range, and c ≦ range, it means that the two are not aligned. In this case, it is necessary to adjust them in the negative Y-axis direction so that the values ​​of laser coaxial displacement sensors A or B are within the range.

4. The high-precision fiber optic coupling parallel alignment method according to claim 3, characterized in that, In step S2, the first and second electric adjustment brackets are adjusted to make the end faces parallel, and the θx and θy axes are adjusted so that the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage. If the two are not in a parallel state, the values ​​of laser coaxial displacement sensors A, B, and C will not be equal. If the θx axis direction is leveled, that is, when the fiber optic clamp and the front view of the optical waveguide chip test stage are on the same plane, the value b of the laser coaxial displacement sensor B is equal to the value c of the laser coaxial displacement sensor C. If the θy axis direction is leveled, that is, when the fiber optic clamp and the bottom surface of the optical waveguide chip test platform are on the same plane, the value a of laser coaxial displacement sensor A is equal to the value b of laser coaxial displacement sensor B. When the values ​​a, b, and c of the laser coaxial displacement sensors A, B, and C are all equal, the side of the fiber optic clamp is completely parallel to the side of the optical waveguide chip test stage, that is, the end face of the fiber optic cable is completely parallel and aligned with the end face of the optical waveguide chip.

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