Automatic high-precision axis alignment device and method for polarization maintaining optical fiber

Abstract

The invention relates to the technical field of polarization maintaining optical fiber axis alignment, and particularly provides an automatic high-precision axis alignment device and method for polarization maintaining optical fibers. The automatic high-precision alignment device for the polarization maintaining optical fibers comprises a laser module, an injection light adjusting module, a first optical fiber to be aligned, a second optical fiber to be aligned, a first optical fiber clamping adjusting module, a second optical fiber clamping adjusting module, a coupler, a polarization winding optical fiber, a polarization winding column, a photoelectric detector and a control processing module, the laser module is used for outputting first frequency modulated linear polarization laser; the photoelectric detector is used for detecting laser power of the output end of the scrambling polarization fiber; and the control processing module is used for automatically adjusting the angles of the injection light adjusting module, the first optical fiber clamping adjusting module and the second optical fiber clamping adjusting module through an optimization algorithm, and automatically realizing alignment of polarization axes of the first to-be-aligned optical fiber and the second to-be-aligned optical fiber according to a set angle. According to the invention, automation of the polarization axis of the polarization-maintaining optical fiber according to a specific angle can be realized, and higher-precision alignment is realized.

Description

Technical Field

[0001] This invention relates to the field of polarization-maintaining fiber alignment technology, and in particular to an automated high-precision alignment device and method for polarization-maintaining fibers. Background Technology

[0002] This invention relates to the field of polarization-maintaining fiber alignment technology, and in particular to an automated high-precision alignment device and method for polarization-maintaining fibers. Summary of the Invention

[0003] In view of this, the present invention proposes an automated high-precision alignment device and method for polarization-maintaining fibers. The method involves controlling a laser module to output a stable linearly polarized laser modulated at a preset frequency, and acquiring in real time the power data of the laser beam passing sequentially through two fibers to be aligned and a polarization-scratching fiber before reaching a photodetector. The power spectrum is obtained through Fourier transform, and with the goal of minimizing the peak value of the power spectrum at a preset frequency, an optimization algorithm automatically adjusts the angles of the injection light adjustment module, the first fiber clamping adjustment module, and the second fiber clamping adjustment module. This achieves automated alignment of the polarization axes of the two polarization-maintaining fibers at a set angle. The device has a simple structure, high alignment accuracy, is applicable to all types of polarization-maintaining fibers, and is easy to operate. With simple adaptive modifications, it can be integrated into fiber optic fusion splicers, further expanding the application scenarios of this automated high-precision alignment device.

[0004] In a first aspect, the present invention provides an automated high-precision alignment device for polarization-maintaining optical fibers, comprising a laser module, an injection light adjustment module, a first optical fiber to be aligned, a second optical fiber to be aligned, a first fiber clamping adjustment module, a second fiber clamping adjustment module, a coupler, a polarization-winding fiber, a polarization-winding post, a photodetector, and a control processing module, wherein... The laser module is used to output linearly polarized laser light modulated at a first frequency; The injection light adjustment module is used to drive the output fiber of the laser module to rotate around the axis; The first fiber clamping and adjustment module is used to clamp and adjust the angle of one end of the first optical fiber to be aligned. The second fiber clamping and adjustment module is used to clamp and adjust the angle of one end of the second optical fiber to be aligned. The coupler is used to couple the other end of the second axis fiber to be aligned to the input end of the polarization scrambling fiber. The deflection-encircling post is used to wind the deflection-scratching optical fiber; The photodetector is used to detect the laser power at the output end of the polarization-scratching fiber; The control processing module is used to automatically adjust the angles of the injection light adjustment module, the first fiber clamping adjustment module, and the second fiber clamping adjustment module through an optimization algorithm, so as to automatically align the polarization axes of the first and second optical fibers to be aligned at a set angle.

[0005] Based on the above technical solutions, preferably, the first port of the injection light adjustment module is fixedly connected to the optical fiber at the output end of the laser module, and the second port of the injection light adjustment module is used to insert the other end of the optical fiber of the first axis to be aligned and cannot be rotated.

[0006] Based on the above technical solution, preferably, the angle adjustment of the first fiber clamping adjustment module and the second fiber clamping adjustment module is controlled by a motor, and the control command of the motor is sent through a control processing module.

[0007] Based on the above technical solutions, preferably, the polarization-redirecting optical fiber is an unpolarized optical fiber, the input end of the polarization-redirecting optical fiber is connected to the other end of the second axis optical fiber to be aligned via a coupler, and the output end of the polarization-redirecting optical fiber is connected to one end of a photodetector.

[0008] Based on the above technical solutions, preferably, the first port of the control processing module is electrically connected to the input end of the laser module, the second port of the control processing module is electrically connected to the third port of the injection light adjustment module, the third port of the control processing module is electrically connected to one end of the first fiber clamping adjustment module, the fourth port of the control processing module is electrically connected to one end of the second fiber clamping adjustment module, and the fifth port of the control processing module is electrically connected to the other end of the photodetector.

[0009] Based on the above technical solutions, preferably, the control processing module is used to acquire the power data of the photodetector in real time, perform Fourier transform on the power data to obtain the power spectrum, and use the peak value of the power spectrum at the first frequency as the feedback signal.

[0010] Based on the above technical solutions, preferably, the linearly polarized laser sequentially passes through the injection light adjustment module, the first axis-to-alignment fiber, the second axis-to-alignment fiber, the coupler, and the polarization-scratching fiber before reaching the photodetector, where the power data of the linearly polarized laser is detected.

[0011] Secondly, the present invention also provides an automated high-precision alignment method for polarization-maintaining optical fibers, the method comprising: The alignment preparation of the first and second optical fibers to be aligned is performed by the control processing module. The control processing module controls the laser module to output linearly polarized laser modulated by the first frequency, acquires the power data of the photodetector in real time, and automatically aligns the first and second optical fibers to be aligned based on the power data.

[0012] Based on the above technical solutions, preferably, the alignment preparation of the first and second optical fibers to be aligned via the control processing module includes: Input the target angle between the first and second optical fibers to be aligned in the control processing module; One end of the first optical fiber to be aligned is fixed with the first optical fiber clamping adjustment module, and the other end is inserted into the second port of the injection light adjustment module. One end of the second optical fiber to be aligned is fixed with the second optical fiber clamping adjustment module, and the other end is inserted into one end of the coupler.

[0013] Based on the above technical solutions, preferably, the automated alignment of the first and second optical fibers to be aligned based on the power data includes: The power data is subjected to Fourier transform to obtain the power spectrum. The angles of the injection light adjustment module, the first fiber clamping adjustment module and the second fiber clamping adjustment module are automatically adjusted by the optimization algorithm to minimize the peak value of the power spectrum at the first frequency, and the rotation angle between the first and second optical fibers to be aligned is obtained at this time. The first fiber clamping and adjustment module is controlled to rotate to automatically align the first and second optical fibers to be aligned. The rotation angle of the first fiber clamping and adjustment module is the difference between the target angle and the rotation angle.

[0014] The automatic high-precision alignment device for polarization-maintaining optical fibers provided by this invention has the following advantages over existing technologies: (1) The laser module outputs a stable linearly polarized laser modulated by a preset frequency through the control processing module, and acquires the power data of the laser as it passes through two optical fibers to be aligned and the polarization-scratching fiber to the photodetector in real time. The power spectrum is obtained by Fourier transform. With the goal of minimizing the peak value of the power spectrum at the preset frequency, the angles of the injection light adjustment module, the first fiber clamping adjustment module and the second fiber clamping adjustment module are automatically adjusted by the optimization algorithm, so as to achieve the effect of automatic alignment of the polarization axes of the two polarization-maintaining fibers according to the set angle. The structure is simple, the alignment accuracy is high, it is suitable for all types of polarization-maintaining fibers, and it is easy to operate. With simple adaptive improvements, it can be integrated into the fiber fusion splicer, further expanding the application scenarios of this automated high-precision alignment device.

[0015] (2) By designing an automated high-precision alignment method for polarization-maintaining fibers, the polarization axis of polarization-maintaining fibers can be automatically aligned at a specific angle with high precision. This method is independent of the cross-sectional structure of the polarization-maintaining fiber and is applicable to various types of polarization-maintaining fibers such as panda type, bowtie type, and photonic crystal. It can be used not only for alignment between polarization-maintaining fibers of the same type but also for alignment between polarization-maintaining fibers of different types. Furthermore, the feedback signal is very sensitive to changes in the polarization axis angle, which can ensure higher alignment accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the automated high-precision alignment device for polarization-maintaining optical fiber provided by the present invention; Figure 2 This is a flowchart illustrating the automated high-precision alignment method for polarization-maintaining optical fibers provided by the present invention. Figure 3 A typical polarization-maintaining fiber pair-axis power spectrum image provided by the present invention; Explanation of reference numerals in the attached diagram: 1. Laser module; 2. Injection light adjustment module; 3. First axis to be aligned fiber; 4. Second axis to be aligned fiber; 5. First fiber clamping adjustment module; 6. Second fiber clamping adjustment module; 7. Coupler; 8. Circumferential fiber; 9. Circumferential post; 10. Photodetector; 11. Control and processing module. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0020] like Figure 1As shown, this invention provides an automated high-precision alignment device for polarization-maintaining optical fibers, comprising a laser module 1, an injection light adjustment module 2, a first optical fiber to be aligned 3, a second optical fiber to be aligned 4, a first optical fiber clamping and adjustment module 5, a second optical fiber clamping and adjustment module 6, a coupler 7, a polarization-winding optical fiber 8, a polarization-winding post 9, a photodetector 10, and a control and processing module 11, wherein... The laser module 1 is used to output linearly polarized laser light modulated by a first frequency; For example, the output fiber of laser module 1 is a polarization-maintaining fiber. Near the operating wavelength of the polarization-maintaining fiber, the output power of laser module 1 is stable, passing through a frequency of... Modulated linearly polarized laser.

[0021] The injection light adjustment module 2 is used to drive the output fiber of the laser module 1 to rotate around the axis; In some embodiments, the first port of the injection light adjustment module 2 is fixedly connected to the output optical fiber of the laser module 1, which can drive the output optical fiber of the laser module 1 to rotate around the axis.

[0022] The second port of the injection light adjustment module 2 is used to insert the other end of the first optical fiber to be aligned axis 3 and cannot be rotated.

[0023] The first fiber clamping and adjustment module 5 is used to clamp and adjust the angle of one end of the first optical fiber to be aligned axis 3; For example, one end of the first optical fiber 3 to be aligned is fixed by the first optical fiber clamping and adjustment module 5. The first optical fiber 3 to be aligned can rotate around the axis under the drive of the first optical fiber clamping and adjustment module 5. The rotation of the first optical fiber clamping and adjustment module 5 can be achieved by a stepper motor, and the control command for the rotation angle is issued by the control processing module 11.

[0024] The second fiber clamping and adjustment module 6 is used to clamp and adjust the angle of one end of the second optical fiber 4 to be aligned. For example, one end of the second optical fiber 4 to be aligned is fixed by the second optical fiber clamping and adjustment module 6. The second optical fiber 4 to be aligned can rotate around the axis under the drive of the second optical fiber clamping and adjustment module 6. The rotation of the second optical fiber clamping and adjustment module 6 can be achieved by a stepper motor, and the control command for the rotation angle is issued by the control processing module 11.

[0025] The coupler 7 is used to couple the other end of the second optical fiber 4 to the input end of the polarization scrambling fiber 8, so that the laser enters the polarization scrambling fiber 8.

[0026] The deflection post 9 is used to wind the deflection-scratching optical fiber 8. It is easy to understand that the polarization-scratching fiber 8 consists of a relatively long section of unpolarized fiber, coiled around the polarization-scratching post 9. This coiling enhances polarization coupling, ensuring that the laser power measured by the photodetector 10, after Fourier transform, is at a higher frequency. Peak values ​​are generated at this location; The photodetector 10 is used to detect the laser power at the output end of the polarization-scratching fiber 8; The control processing module 11 is used to automatically adjust the angles of the injection light adjustment module 2, the first fiber clamping adjustment module 5, and the second fiber clamping adjustment module 6 through an optimization algorithm, so as to automatically align the polarization axes of the first alignment axis fiber 3 and the second alignment axis fiber 4 according to the set angle.

[0027] In some embodiments, the first port of the control processing module 11 is electrically connected to the input end of the laser module 1, the second port of the control processing module 11 is electrically connected to the third port of the injection light adjustment module 2, the third port of the control processing module 11 is electrically connected to one end of the first fiber clamping adjustment module 5, the fourth port of the control processing module 11 is electrically connected to one end of the second fiber clamping adjustment module 6, and the fifth port of the control processing module 11 is electrically connected to the other end of the photodetector 10.

[0028] For example, the control processing module 11 is used to control the laser module 1 to output laser light, acquire the power data of the photodetector 10 in real time and perform Fourier transform to obtain the power spectrum, and the control processing module 11 uses this power spectrum to... The peak value at the point is the feedback signal. The angles of the injection light adjustment module 2, the first fiber clamping adjustment module 5, and the second fiber clamping adjustment module 6 are automatically adjusted by the optimization algorithm to automatically align the polarization axes of the first optical fiber to be aligned and the second optical fiber to be aligned at the set angle.

[0029] It is worth noting that the power spectrum obtained by Fourier transforming the power data of photodetector 10 is at the output laser modulation frequency of laser module 1. A peak exists at a certain point, and this peak is used as feedback. When the polarization axis angle between the first axis to be aligned fiber 3 and the second axis to be aligned fiber 4 is 90°, the power spectrum is at... The peak value is the smallest at that location.

[0030] In some embodiments, the polarization-wrapped fiber 8 is an unpolarized fiber, the input end of the polarization-wrapped fiber 8 is connected to the other end of the second axis-to-align fiber 4 through a coupler 7, and the output end of the polarization-wrapped fiber 8 is connected to one end of the photodetector 10.

[0031] In some embodiments, the control processing module 11 is used to acquire the power data of the photodetector 10 in real time, perform Fourier transform on the power data to obtain the power spectrum, and use the peak value of the power spectrum at a first frequency as a feedback signal.

[0032] In some embodiments, the linearly polarized laser sequentially passes through the injection light adjustment module 2, the first axis-to-alignment fiber 3, the second axis-to-alignment fiber 4, the coupler 7, and the polarization-scratching fiber 8 before reaching the photodetector 10, where the power data of the linearly polarized laser is detected.

[0033] For example, laser module 1 has a stable output power near the operating wavelength of the polarization-maintaining fiber, passing through a frequency of [frequency value missing]. The modulated linearly polarized laser passes sequentially through the injection light adjustment module 2, the first axis-to-alignment fiber 3, the second axis-to-alignment fiber 4, the coupler 7, the polarization-scratching fiber 8, and finally reaches the photodetector 10. The photodetector 10 transmits the power measurement results to the control and processing module 11 in real time.

[0034] In this embodiment, the control processing module controls the laser module to output a stable linearly polarized laser modulated at a preset frequency, and acquires in real time the power data of the laser beam passing through two optical fibers to be aligned and the polarization-scratching fiber to reach the photodetector. The power spectrum is obtained by Fourier transform. With the goal of minimizing the peak value of the power spectrum at the preset frequency, the angles of the injection light adjustment module, the first fiber clamping adjustment module, and the second fiber clamping adjustment module are automatically adjusted by an optimization algorithm. This achieves the effect of automatically aligning the polarization axes of the two polarization-maintaining fibers at a set angle. The structure is simple, the alignment accuracy is high, it is applicable to all types of polarization-maintaining fibers, and it is easy to operate. With simple adaptive improvements, it can be integrated into an optical fiber fusion splicer, further expanding the application scenarios of this automated high-precision alignment device.

[0035] Figure 2 This is a flowchart illustrating the automated high-precision alignment method for polarization-maintaining optical fibers provided by the present invention, as shown below. Figure 2 As shown, the automated high-precision alignment method for polarization-maintaining optical fiber includes steps 210 and 220.

[0036] Step 210: The first optical fiber 3 and the second optical fiber 4 to be aligned are prepared by the control processing module 11. In some embodiments, the alignment preparation of the first optical fiber 3 and the second optical fiber 4 to be aligned via the control processing module 11 includes: Input the target angle between the first optical fiber 3 and the second optical fiber 4 to be aligned into the control processing module 11; One end of the first optical fiber 3 to be aligned is fixed with the first optical fiber clamping adjustment module 5, and the other end is inserted into the second port of the injection light adjustment module 2. One end of the second optical fiber 4 to be aligned is fixed with the second optical fiber clamping adjustment module 6, and the other end is inserted into one end of the coupler 7.

[0037] For example, the target angle between the first optical fiber 3 and the second optical fiber 4 to be aligned is input into the control processing module 11, i.e., the alignment angle. .

[0038] Step 220: Control the laser module 1 to output linearly polarized laser modulated by the first frequency through the control processing module, acquire the power data of the photodetector 10 in real time, and automatically align the first axis fiber 3 and the second axis fiber 4 based on the power data.

[0039] In some embodiments, the automated alignment of the first optical fiber 3 and the second optical fiber 4 to be aligned based on the power data includes: The power data is subjected to Fourier transform to obtain the power spectrum. The angles of the injection light adjustment module 2, the first fiber clamping adjustment module 5 and the second fiber clamping adjustment module 6 are automatically adjusted by the optimization algorithm to minimize the peak value of the power spectrum at the first frequency, and the rotation angle between the first axis fiber 3 and the second axis fiber 4 is obtained at this time. The first fiber clamping adjustment module 5 is controlled to rotate to automatically align the first optical fiber 3 and the second optical fiber 4 to be aligned. The rotation angle of the first fiber clamping adjustment module 5 is the difference between the target angle and the rotation angle.

[0040] For example, the control processing module 11 controls the laser module 1 to output power stably, passing through a frequency of Modulated linearly polarized laser is used, and the power data of photodetector 10 is acquired in real time and Fourier transform is performed to obtain the power spectrum. The control processing module 11 automatically adjusts the rotation angle of injection light adjustment module 2, first fiber clamping adjustment module 5 and second fiber clamping adjustment module 6 through optimization algorithm, so that the measured power spectrum is within the range of the laser beam. The peak value is minimum at this point, and the angle between the polarization axes of the two optical fibers to be aligned is 90 degrees. The control processing module 11 controls the first optical fiber clamping adjustment module 5 to rotate the angle. This allows the polarization axis of the fiber to be aligned to a set angle. Alignment.

[0041] Figure 3 This invention provides a typical polarization-maintaining fiber pair-axis power spectrum image. For example... Figure 3 As shown, the modulation frequency of the laser output by laser module 1 is... Therefore, the power spectrum curve is in A peak appears at [location missing]. When the angle between the polarization axes of the fiber to be aligned is 90°, the power spectrum [location missing]. The peak value is the smallest at -82.3 dB, such as... Figure 3 As shown in Figure (b), when the polarization axis angle of the fiber to be aligned deviates from 90°, the peak value changes sharply: decreasing and increasing by 0.01 degrees, the peak value increases by 7.7 dB and 6.4 dB respectively, becoming -74.6 dB and -75.9 dB, as shown in Figure (b). Figure 3 Figure (a) and Figure 3 As shown in Figure (c), the polarization-maintaining fiber alignment method has high accuracy, with an alignment error of less than 0.01 degrees.

[0042] In this embodiment, by designing an automated high-precision alignment method for polarization-maintaining fibers, the polarization axis of the polarization-maintaining fiber can be automatically and precisely aligned at a specific angle. This method is independent of the cross-sectional structure of the polarization-maintaining fiber and is applicable to various types of polarization-maintaining fibers, such as panda type, bowtie type, and photonic crystal. It can be used not only for alignment between polarization-maintaining fibers of the same type but also for alignment between polarization-maintaining fibers of different types. Furthermore, the feedback signal is highly sensitive to changes in the polarization axis angle, ensuring higher alignment accuracy.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision automated alignment device for polarization-maintaining optical fibers, characterized in that, The system includes a laser module (1), an injection light adjustment module (2), a first axis-to-alignment fiber (3), a second axis-to-alignment fiber (4), a first fiber clamping adjustment module (5), a second fiber clamping adjustment module (6), a coupler (7), a polarization-bypassing fiber (8), a polarization-bypassing post (9), a photodetector (10), and a control processing module (11). The laser module (1) is used to output linearly polarized laser modulated by a first frequency; The injection light adjustment module (2) is used to drive the output fiber of the laser module (1) to rotate around the axis; The first fiber clamping adjustment module (5) is used to clamp and adjust the angle of one end of the first optical fiber to be aligned (3); The second fiber clamping adjustment module (6) is used to clamp and adjust the angle of one end of the second optical fiber to be aligned (4); The coupler (7) is used to couple the other end of the second optical fiber to be aligned (4) to the input end of the polarization scrambling fiber (8); The deflection post (9) is used to wind the deflection-scratching fiber (8). The photodetector (10) is used to detect the laser power at the output end of the polarization-scratching fiber (8); The control processing module (11) is used to automatically adjust the angles of the injection light adjustment module (2), the first fiber clamping adjustment module (5) and the second fiber clamping adjustment module (6) through an optimization algorithm, so as to automatically align the polarization axes of the first optical fiber to be aligned (3) and the second optical fiber to be aligned (4) according to the set angle.

2. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 1, characterized in that, The first port of the injection light adjustment module (2) is fixedly connected to the output optical fiber of the laser module (1), and the second port of the injection light adjustment module (2) is used to insert the other end of the first optical fiber to be aligned (3) and cannot be rotated.

3. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 2, characterized in that, The angle adjustment of the first fiber clamping adjustment module (5) and the second fiber clamping adjustment module (6) is controlled by a motor, and the control command of the motor is sent through the control processing module (11).

4. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 3, characterized in that, The polarization-redirecting fiber (8) is a non-polarized fiber. The input end of the polarization-redirecting fiber (8) is connected to the other end of the second axis fiber (4) through a coupler (7). The output end of the polarization-redirecting fiber (8) is connected to one end of the photodetector (10).

5. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 4, characterized in that, The first port of the control processing module (11) is electrically connected to the input end of the laser module (1), the second port of the control processing module (11) is electrically connected to the third port of the injection light adjustment module (2), the third port of the control processing module (11) is electrically connected to one end of the first fiber clamping adjustment module (5), the fourth port of the control processing module (11) is electrically connected to one end of the second fiber clamping adjustment module (6), and the fifth port of the control processing module (11) is electrically connected to the other end of the photodetector (10).

6. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 5, characterized in that, The control processing module (11) is used to acquire the power data of the photodetector (10) in real time, perform Fourier transform on the power data to obtain the power spectrum, and use the peak value of the power spectrum at the first frequency as the feedback signal.

7. The automated high-precision alignment device for polarization-maintaining optical fibers as described in claim 6, characterized in that, The linearly polarized laser sequentially passes through the injection light adjustment module (2), the first axis-to-alignment fiber (3), the second axis-to-alignment fiber (4), the coupler (7), and the polarization-scratching fiber (8) before reaching the photodetector (10). The power data of the linearly polarized laser is detected by the photodetector (10).

8. A method for automated high-precision alignment of polarization-maintaining optical fibers, implemented using the automated high-precision alignment device for polarization-maintaining optical fibers as described in any one of claims 1-7, characterized in that, The method includes: The alignment preparation of the first optical fiber (3) and the second optical fiber (4) to be aligned is performed by the control processing module (11). The laser module (1) is controlled by the control processing module to output linearly polarized laser with first frequency modulation, and the power data of the photodetector (10) is acquired in real time. Based on the power data, the first optical fiber (3) and the second optical fiber (4) to be aligned are automatically aligned.

9. The automated high-precision alignment method for polarization-maintaining optical fibers as described in claim 8, characterized in that, The alignment preparation of the first optical fiber (3) and the second optical fiber (4) to be aligned via the control processing module (11) includes: Input the target angle between the first optical fiber (3) and the second optical fiber (4) to be aligned in the control processing module (11); One end of the first optical fiber to be aligned (3) is fixed with the first optical fiber clamping adjustment module (5), and the other end is inserted into the second port of the injection light adjustment module (2). One end of the second optical fiber to be aligned (4) is fixed with the second optical fiber clamping adjustment module (6), and the other end is inserted into one end of the coupler (7).

10. The automated high-precision alignment method for polarization-maintaining optical fibers as described in claim 8, characterized in that, The automated alignment of the first optical fiber (3) and the second optical fiber (4) based on the power data includes: The power data is subjected to Fourier transform to obtain the power spectrum. The angles of the injection light adjustment module (2), the first fiber clamping adjustment module (5), and the second fiber clamping adjustment module (6) are automatically adjusted by the optimization algorithm to minimize the peak value of the power spectrum at the first frequency, and the rotation angle between the first axis fiber (3) and the second axis fiber (4) is obtained at this time. The first fiber clamping adjustment module (5) is controlled to rotate to automatically align the first optical fiber (3) and the second optical fiber (4) to be aligned. The angle of rotation of the first fiber clamping adjustment module (5) is the difference between the target angle and the rotation angle.

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