Polarization-maintaining beam splitter with filtering function, assembly method thereof, and gyro system

Abstract

The present application relates to the field of polarization-maintaining beam splitters, and more particularly to a polarization-maintaining beam splitter with a filtering function, comprising a fixed tube structure, a first fiber pigtail assembly disposed within the fixed tube structure, a second fiber pigtail assembly, a beam splitter, and a filter assembly, wherein the filter assembly comprises a filter, the filter and the beam splitter being fixedly disposed between the first fiber pigtail assembly and the second fiber pigtail assembly, the filter being disposed between the first fiber pigtail assembly and the beam splitter to filter light output by the first fiber pigtail assembly. The present application has the effect of integrating the beam splitting and filtering functions into a polarization-maintaining beam splitter, thereby reducing the product size.

Description

Technical Field

[0001] The present invention relates to the field of polarization-maintaining beam splitters, in particular to a polarization-maintaining beam splitter with a filtering function, an assembly method thereof, and a gyro system. Background Art

[0002] In medium and high precision gyro systems, ASE light sources and polarization-maintaining beam splitters are often used. The light emitted by the ASE light source can be split into multiple light paths through the polarization-maintaining beam splitter. Due to the irregularity of the ASE light source spectrum, a filter that can perform filtering and shaping is usually set between the polarization-maintaining beam splitter and the ASE light source.

[0003] In related technologies, filters and polarization-maintaining beam splitters are two separate products. The filter's function is to filter and shape the light source to allow light of a specific wavelength to pass through. The polarization-maintaining beam splitter's function is to split the light wave's power while maintaining its original polarization.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there are the following defects: the filter and the polarization-maintaining beam splitter are two independent products, which occupy a large space and make the product size larger. Summary of the Invention

[0005] In order to reduce product size, the present application provides a polarization-maintaining beam splitter with filtering function.

[0006] In the first aspect, the present application provides a polarization-maintaining beam splitter with filtering function, which adopts the following technical solution:

[0007] A polarization-maintaining beam splitter with a filtering function comprises a fixed tube structure, a first pigtail assembly, a second pigtail assembly, a beam splitter, and a filter assembly arranged within the fixed tube structure. The filter assembly comprises a filter, and the filter and the beam splitter are fixedly arranged between the first pigtail assembly and the second pigtail assembly. The filter is arranged between the first pigtail assembly and the beam splitter to filter the light output by the first pigtail assembly.

[0008] By adopting the above technical solution, a filter is provided in the polarization-maintaining beam splitter so that the beam splitter integrates filtering and splitting functions, thereby achieving the purpose of reducing the size of the finished product.

[0009] Preferably, the fixed tube structure includes a first fixed tube, and the filter assembly also includes a connecting tube fixed to the filter plate, the filter plate is fixed on the end face of one end of the connecting tube, and the connecting tube is inserted into the first fixed tube and fixed to the first fixed tube.

[0010] By adopting the above technical solution, the filter is fixed to one end of the connecting tube, so that the thinner filter can be inserted into the first fixing tube and fixed in the first fixing tube.

[0011] Preferably, the end surface of the connecting tube for fixing one end of the filter is tilted so as to tilt the filter.

[0012] By adopting the above technical solution, the tilt angle of the filter is adjusted to ensure the incident angle of the light, reducing the incidence angle difference of the filter, and thus ensuring that the spectrum of the shaped light meets the set requirements.

[0013] Preferably, the filter is configured as a GFF or BPF.

[0014] By adopting the above technical solution, the filter can compensate for the light wave and allow light of a specific wavelength to pass through to achieve the effect of filtering and shaping, and the use of GFF or BPF sheets can make the product have better full-temperature performance.

[0015] Preferably, the beam splitter is configured as a lens coated with a beam splitting film.

[0016] By adopting the above technical solution, the beam splitter in the prior art uses a structure of a beam splitter and a lens for splitting and collimating and focusing. This application removes the beam splitter and uses a lens coated with a beam splitting film for splitting and collimating and focusing, further reducing the size of the product.

[0017] Preferably, an anti-reflection component is provided between the first pigtail assembly and the filter, and the anti-reflection component is a lens coated with an anti-reflection film.

[0018] By adopting the above technical solution, the antireflection film is used to reduce the reflection loss of light, enhance the intensity of transmitted light, and at the same time play a role in collimation and focusing.

[0019] Preferably, one end of the transmittance-enhancing component is placed in the first fixed tube and fixed to the first fixed tube, one end of the light-splitting component is placed in the first fixed tube and fixed to the first fixed tube, the fixed tube structure also includes multiple second fixed tubes, the first fixed tube is placed between two second fixed tubes, the first fixed tube is fixed to the second fixed tubes, the first pigtail assembly is fixed in the second fixed tube, and the second pigtail assembly is fixed in the second fixed tube.

[0020] By adopting the above technical solution, the first fixing tube meets the second fixing tube for fixing respectively, so as to facilitate the adjustment and installation of the first pigtail assembly, the second pigtail assembly, the anti-reflection component, the splitter component and the filter assembly, thereby facilitating the work of the user.

[0021] Preferably, a packaging tube for packaging is provided on the outside of the first fixing tube and the second fixing tube.

[0022] By adopting the above technical solution, the product is packaged using a packaging tube to achieve the purpose of protecting the product.

[0023] On the second aspect, the present application also discloses an assembly method for assembling the above-mentioned polarization-maintaining beam splitter with filtering function, including the following steps: patching, fixing the filter on the connecting tube, and inserting the filter and the connecting tube into the first fixed tube, and fixing them after positioning; lens assembly, inserting the splitter and the anti-reflection component into the first fixed tube and fixing them; pigtail connection, connecting the first pigtail assembly and the second pigtail assembly, and fixing them through the second fixed tube.

[0024] By adopting the above technical solution, the filter is first installed in the first fixed tube, then the splitter and the anti-reflection element are installed, and finally the fiber pigtails are connected to form the above-mentioned polarization-maintaining beam splitter with filtering function. The polarization-maintaining beam splitter has both filtering and splitting functions, thereby achieving the purpose of reducing the size of the finished product.

[0025] On the third aspect, the present application also discloses a gyro system, which uses the above-mentioned polarization-maintaining beam splitter with filtering function, including: an ASE light source, the polarization-maintaining beam splitter with filtering function, a first detector, a second detector, an MIOC modulator and an optical fiber ring. The polarization-maintaining beam splitter with filtering function is arranged between the ASE light source and the MIOC modulator to filter, shape and split the light emitted by the ASE light source. The light is divided into two paths, one path of light is reflected into the first detector used to monitor the stability of the light source, and the other path of light enters the optical fiber ring through the MIOC modulator, and after passing through the MIOC modulator and the polarization-maintaining beam splitter with filtering function, enters the second detector for analysis as a system signal.

[0026] By adopting the above technical solution, the functions of splitting and filtering are simultaneously realized on the beam splitter, and the filter is removed from the gyro system, which can reduce the volume of the finished system, reduce the welding points, reduce the loss, improve the product performance, and reduce the tediousness of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic cross-sectional structure diagram of a polarization-maintaining beam splitter with filtering function according to Example 1 of the present application.

[0028] Figure 2 This is a schematic cross-sectional structural diagram of the first pigtail assembly in a polarization-maintaining beam splitter with filtering function according to Example 1 of the present application.

[0029] Figure 3 This is an exploded view of a filtering component in a polarization-maintaining beam splitter with filtering function according to Example 1 of the present application.

[0030] Figure 4 This is an exploded view of a connecting tube in a polarization-maintaining beam splitter with filtering function according to Example 2 of the present application.

[0031] Figure 5This is a cross-sectional view of a filtering component in a polarization-maintaining beam splitter with filtering function according to Example 2 of the present application.

[0032] Figure 6 This is a side view of a filter assembly installed in a first fixed tube in a polarization-maintaining beam splitter with filtering function according to Example 2 of the present application.

[0033] Figure 7 This is a system block diagram of a gyroscope system according to an embodiment of the present application.

[0034] Figure numerals: 1. fixed tube structure; 10. first fixed tube; 11. second fixed tube; 12. packaging tube; 2. first pigtail assembly; 20. first polarization-maintaining optical fiber; 200. stress zone; 201. core hole; 21. second polarization-maintaining optical fiber; 22. third fixed tube; 23. first inclined plane; 3. second pigtail assembly; 30. third polarization-maintaining optical fiber; 31. fourth polarization-maintaining optical fiber; 32. third inclined plane; 4. anti-reflection component; 40. second inclined plane; 5. spectrometer; 50. fourth inclined plane; 6. filter assembly; 7. filter plate; 8. connecting tube; 80. structural plate; 81. first side surface; 82. second side surface; 83. third side surface; 84. fourth side surface; 85. groove structure. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 This application is described in further detail.

[0036] Example 1: This embodiment of the present application discloses a polarization-maintaining beam splitter with filtering function, referring to Figure 1 , including a fixed tube structure 1, a first pigtail assembly 2, a second pigtail assembly 3, an anti-reflection component 4, a spectrometer 5 and a filter assembly 6. The first pigtail assembly 2, the anti-reflection component 4, the filter assembly 6, the spectrometer 5 and the second pigtail assembly 3 are sequentially installed in the fixed tube structure 1 and fixed.

[0037] Reference Figure 1 The fixed tube structure 1 includes a first fixed tube 10 and a second fixed tube 11. Both the first fixed tube 10 and the second fixed tube 11 are configured as hollow cylindrical tubes. One first fixed tube 10 is provided, and the antireflection element 4, the filter assembly 6, and the spectrometer 5 are sequentially bonded within the first fixed tube 10. Two second fixed tubes 11 are provided, and the first pigtail assembly 2 is bonded within one second fixed tube 11, and the second pigtail assembly 3 is bonded within the other second fixed tube 11. The first fixed tube 10 is disposed between the two second fixed tubes 11, with the axes of the second fixed tube 11 and the first fixed tube 10 coinciding. The ends of the first fixed tube 10 and the ends of the second fixed tubes 11 are bonded.

[0038] Reference Figure 1The second fixed tube 11 and the first fixed tube 10 are provided with a packaging tube 12. The packaging tube 12 is a hollow cylindrical steel tube. The space between the packaging tube 12 and the first fixed tube 10 and the second fixed tube 11 is filled with silicone, and both ends of the packaging tube 12 are sealed by silicone.

[0039] The anti-reflection element 4 is a lens coated with an anti-reflection film. The anti-reflection element 4 is configured as a cylindrical structure with a circular cross-section. One end of the anti-reflection element 4 is placed in a first fixed tube 10, and the other end of the anti-reflection element 4 is placed in a second fixed tube 11. The anti-reflection element 4 has the function of reducing the reflection loss of light and enhancing the intensity of the transmitted light, and can also play a role in collimation and focusing.

[0040] The beam splitter 5 is a lens coated with a beam splitter film. It has a cylindrical structure with a circular cross-section. One end of the beam splitter 5 is placed in a first fixed tube 10, and the other end is placed in a second fixed tube 11. The beam splitter 5 performs both beam splitting and collimation and focusing functions, capable of splitting one beam into two beams of equal power.

[0041] The anti-reflection element 4 and the light splitting element 5 are first fixed in the first fixed tube 10, and then a second fixed tube 11 is sleeved on the anti-reflection element 4, and another second fixed tube 11 is sleeved on the light splitting element 5. The outer diameter of the second fixed tube 11 is the same as the outer diameter of the first fixed tube 10, and the inner diameter of the second fixed tube 11 is larger than the inner diameter of the first fixed tube 10, which is easy to install.

[0042] Reference Figure 2 The first pigtail assembly 2 includes a first polarization-maintaining optical fiber 20, a second polarization-maintaining optical fiber 21 and a third fixing tube 22. The cross-section of the first polarization-maintaining optical fiber 20 is circular. A core hole 201 and a stress zone 200 are provided in the first polarization-maintaining optical fiber 20. Two stress zones 200 are provided and are respectively provided on both sides of the core hole 201. The cross-sections of the stress zone 200, the core hole 201 and the first polarization-maintaining optical fiber 20 are all circular. The center of the cross-section of the stress zone 200, the center of the cross-section of the core hole 201 and the center of the cross-section of the first polarization-maintaining optical fiber 20 are all on the same straight line. The center of the cross-section of the core hole 201 coincides with the center of the cross-section of the first polarization-maintaining optical fiber 20, and a core is passed through the core hole 201.

[0043] The second polarization-maintaining optical fiber 21 has the same structure as the first polarization-maintaining optical fiber 20 , and will not be described in detail here.

[0044] Reference Figure 2 The third fixing tube 22 is sleeved over the first and second polarization-maintaining fibers 20 and 21. The inner wall of the third fixing tube 22 abuts the first and second polarization-maintaining fibers 20 and 21. The cross-section of the third fixing tube 22 is a hollow, waist-shaped hole. Glue is applied between the first and second polarization-maintaining fibers 20 and 21 to bond them to the third fixing tube 22.

[0045] The second pigtail assembly 3 includes a third polarization-maintaining optical fiber 30 , a fourth polarization-maintaining optical fiber 31 and the third fixing tube 22 . The second pigtail assembly 3 has the same structure as the first pigtail assembly 2 , and will not be described in detail herein.

[0046] Reference Figure 1 The end face of the first pigtail assembly 2 opposite to the anti-reflection element 4 is provided with a first inclined surface 23, and the inclination angle of the first inclined surface 23 is 8°. The end face of the anti-reflection element 4 opposite to the first pigtail assembly 2 is provided with a second inclined surface 40, and the inclination angle of the second inclined surface 40 is 8° to ensure that the return loss of the first pigtail assembly 2 and the anti-reflection element 4 is ≥60dB.

[0047] Reference Figure 1 A third inclined surface 32 is provided on the side of the second fiber pigtail assembly 3 opposite to the splitter 5, and the inclination angle of the third inclined surface 32 is 8°. A fourth inclined surface 50 is provided on the end face of the splitter 5 opposite to the second fiber pigtail assembly 3, and the inclination angle of the fourth inclined surface 50 is 8° to ensure that the return loss of the second fiber pigtail assembly 3 and the splitter 5 is ≥60dB.

[0048] Reference Figure 3 The filter assembly 6 includes a filter 7 and a connecting tube 8. The filter 7 can be set as a square piece or a round piece, etc. In the present application, the filter 7 is set as a square piece, and the side of the filter 7 opposite to the anti-reflection element 4 is square. The connecting tube 8 is set as a hollow circular tube structure. The filter 7 is bonded to the end face of one end of the connecting tube 8 in the length direction, and the connecting tube 8 is glued and fixed to the first fixed tube 10.

[0049] In order to ensure the incident angle and ensure that the spectrum of the shaped light meets the set requirements, the end face of the connecting tube 8 used to bond the filter 7 can be tilted, and the tilt angle is 0°-5°. The tilt angle of this application can be 1° or 2°. Adjusting the tilt angle of the filter 7 can reduce the phenomenon of incident angle differences in the filter 7.

[0050] Filter 7 can be a GFF (Gray Form Factor) film coated on the lens, or a BPF (Bypass Filter) film coated on the lens. Filter 7 can compensate for light waves, allowing light of specific wavelengths to pass through to achieve filtering and shaping. Using a GFF or BPF film improves the product's full-temperature performance.

[0051] All bonding in this application is performed using a fluid glue. Specifically, the glue in this application can be a heat-curing glue. Heat-curing glue has poor fluidity at room temperature, but better fluidity when heated, allowing it to penetrate between the structures at the connection. The glue used in this application can also be a dual-curing glue. Dual-curing glue has better fluidity at room temperature and can be cured by ultraviolet light and then heated.

[0052] In this application, the first fixing tube 10, the second fixing tube 11, the third fixing tube 22 and the connecting tube 8 are capillary glass tubes. The amount of UV glue can be seen through the transparent glass material, and the transparent glass material can transmit UV light to facilitate UV curing. Figure 1 , using polarization-maintaining optical fiber and capillary glass tube for positioning, can ensure that the polarization directions of light a, light b, light c and light d are consistent.

[0053] Compared with the glue wrapping process, the glass tube and glue are used for fixation, so that the glue thickness between the glass tubes is uniform, and the overall product has good full-temperature performance.

[0054] The implementation principle of the polarization-maintaining beam splitter with filtering function in the embodiment of the present application is as follows: a lens coated with a spectrometer film and a filter 7 are arranged in the polarization-maintaining beam splitter, so that the beam splitter has both filtering and spectrometer functions, so as to achieve the purpose of reducing the size of the finished product; compared with the existing beam splitter with a spectrometer and a lens, the spectrometer is removed and a spectrometer film is coated on the lens, which further reduces the size of the finished product while achieving the effects of spectrometering and collimating and focusing.

[0055] Example 2: This application also discloses a polarization-maintaining beam splitter with a filtering function, which differs from Example 1 in the way the filter 7 and the connecting tube 8 are fixed.

[0056] Reference Figure 4 and Figure 5 The connecting pipe 8 includes a plurality of structural pieces 80 bonded together. In the present application, the number of structural pieces 80 is set to four. The structural piece 80 is provided with a first side surface 81, a second side surface 82, a third side surface 83 and a fourth side surface 84. The first side surface 81 is arranged opposite to the second side surface 82. The first side surface 81 is arranged as an arcuate surface. The second side surface 82, the third side surface 83 and the fourth side surface 84 are all arranged as flat surfaces. The second side surface 82 is arranged opposite to the first side surface 81. There are two third side surfaces 83 and two fourth side surfaces 84. The two third side surfaces 83 are arranged opposite to each other, and the two fourth side surfaces 84 are also arranged opposite to each other.

[0057] The structural pieces 80 are arranged in pairs, the second side surfaces 82 of the opposite structural pieces 80 are parallel and opposite to each other, and the second side surfaces 82 of the adjacent structural pieces 80 are arranged vertically. Figure 5 A groove structure 85 is formed between the third side surfaces 83 of adjacent structural sheets 80. The groove structure 85 is filled or coated with glue to secure the adjacent structural sheets 80. The filter sheet 7 is placed between the structural sheets 80. The filter sheet 7 is bonded to the second side surface 82 of each structural sheet 80. The structural sheets 80 are then secured by filling or coating the groove structure 85 with glue, thereby facilitating the insertion of the filter sheet 7 into the connecting tube 8.

[0058] In order to enable the filter 7 to be tilted, the first side surfaces 81 of the two relative structural sheets 80 are both tilted, with an inclination angle of 0°-5°. The inclination angle of the present application can be 1° or 2° to adjust the inclination angle of the filter 7, thereby reducing the phenomenon of differences in the incident angles of the filter 7.

[0059] The implementation principle of the polarization-maintaining beam splitter with filtering function in the embodiment of the present application is: a lens coated with a spectroscopic film and a filter 7 are arranged in the polarization-maintaining beam splitter, so that the beam splitter has both filtering and spectroscopic functions, so as to achieve the purpose of reducing the size of the finished product. In this embodiment, the filter 7 can be embedded in the connecting tube 8 to reduce the overall length and occupied space of the connecting tube 8 and the filter 7, thereby further reducing the size of the product.

[0060] The present application also discloses a method for assembling a polarization-maintaining beam splitter with a filtering function, which is used to assemble the polarization-maintaining beam splitter with a filtering function of Example 1, comprising the following steps:

[0061] S1: Fix the filter 7 on the connecting tube 8, and insert the filter 7 and the connecting tube 8 into the first fixing tube 10, and fix them after positioning.

[0062] According to the preset angle of the filter 7, the end surface of one end of the connecting tube 8 is beveled and cut, and the filter 7 is fixed to the cut end surface by glue.

[0063] S2: Assemble the lens. Insert the beam splitter 5 and the anti-reflection element 4 into the first fixing tube 10 and fix them. Before fixing, adjust the angles of the beam splitter 5 and the anti-reflection element 4 as needed.

[0064] S3: Pigtail connection, connecting the first pigtail assembly 2 and the second pigtail assembly 3, and fixing them through the second fixing tube 11.

[0065] Before fixing, adjustment is required. Use a power meter and extinction ratio tester to monitor the loss and extinction ratio until the loss and extinction ratio parameters are qualified. Then, glue is applied between the second fixing tube 11 and the first pigtail assembly 2 and between the second fixing tube 11 and the second pigtail assembly 3 to fix them.

[0066] S4: Packaging: The product is packaged using a packaging tube 12, and silicone is filled inside and at both ends of the packaging tube 12 to seal the packaging tube 12.

[0067] The implementation principle of the assembly method of the polarization-maintaining beam splitter with filtering function in the embodiment of the present application is: first, the filter 7 is installed in the first fixed tube 10, then the splitter 5 and the anti-reflection component 4 are installed, and finally the first fiber pigtail assembly 2 and the second fiber pigtail assembly 3 are connected and packaged to form the above-mentioned polarization-maintaining beam splitter with filtering function, so that the polarization-maintaining beam splitter has both filtering and splitting functions, so as to achieve the purpose of reducing the size of the finished product.

[0068] The present application also discloses a gyro system, primarily related to a medium-precision, high-altitude gyro system, comprising an ASE light source, the aforementioned polarization-maintaining beam splitter with filtering function, a first detector, a second detector, an MIOC modulator, and a fiber ring. The polarization-maintaining beam splitter with filtering function is disposed between the ASE light source and the MIOC modulator. The polarization-maintaining beam splitter with filtering function filters, shapes, and splits the light emitted by the ASE light source, dividing the light source into two light paths. One light path is reflected into the first detector, which is used to monitor the stability of the light source; the other light path passes through the MIOC modulator and enters the fiber ring. After passing through the MIOC modulator and the polarization-maintaining beam splitter with filtering function, it enters the second detector for analysis as a system signal.

[0069] The implementation principle of the gyro system in the embodiment of the present application is: to simultaneously realize the functions of splitting and filtering on the beam splitter, and to remove the filter from the gyro system, which can reduce the volume of the finished system, reduce the welding points, reduce the loss, improve the product performance, and reduce the tediousness of manual operation.

[0070] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A polarization-maintaining beam splitter with filtering function, characterized in that: The invention comprises a fixed tube structure (1), a first pigtail assembly (2) arranged in the fixed tube structure (1), a second pigtail assembly (3), a light splitter (5), and a filter assembly (6), wherein the filter assembly (6) comprises a filter (7), the filter (7) and the light splitter (5) are fixedly arranged between the first pigtail assembly (2) and the second pigtail assembly (3), and the filter (7) is arranged between the first pigtail assembly (2) and the light splitter (5) to filter the light output by the first pigtail assembly (2); The fixed tube structure (1) includes a first fixed tube (10), the filter assembly (6) also includes a connecting tube (8) fixed to the filter plate (7), the filter plate (7) is fixed to the end surface of one end of the connecting tube (8), and the connecting tube (8) is inserted into the first fixed tube (10) and fixed to the first fixed tube (10); The connecting tube (8) is used to fix the end surface of one end of the filter (7) and is arranged to be tilted so as to tilt the filter (7); The light splitting element (5) is configured as a lens coated with a light splitting film; An anti-reflection component (4) is provided between the first pigtail assembly (2) and the filter (7); the anti-reflection component (4) is a lens coated with an anti-reflection film.

2. The polarization-maintaining beam splitter with filtering function according to claim 1, characterized in that: The filter plate (7) is configured as a GFF plate or a BPF plate.

3. The polarization-maintaining beam splitter with filtering function according to claim 1, characterized in that: One end of the anti-reflection element (4) is placed in the first fixed tube (10) and fixed to the first fixed tube (10), one end of the light splitting element (5) is placed in the first fixed tube (10) and fixed to the first fixed tube (10), the fixed tube structure (1) also includes a plurality of second fixed tubes (11), the first fixed tube (10) is placed between the second fixed tubes (11), the first fixed tube (10) is fixed to the second fixed tubes (11), the first pigtail assembly (2) is fixed in the second fixed tube (11), and the second pigtail assembly (3) is fixed in the second fixed tube (11).

4. The polarization-maintaining beam splitter with filtering function according to claim 3, characterized in that: The first fixed tube (10) and the second fixed tube (11) are externally sleeved with a packaging tube (12) for packaging.

5. An assembly method for assembling the polarization-maintaining beam splitter with filtering function according to claim 3 or 4, characterized in that: The following steps are involved: Patching, fixing the filter (7) on the connecting tube (8), and inserting the filter (7) and the connecting tube (8) into the first fixing tube (10), positioning them and fixing them; Assembling the lens, inserting the light splitting element (5) and the anti-reflection element (4) into the first fixing tube (10) and fixing them; Pigtail connection, connecting the first pigtail assembly (2) and the second pigtail assembly (3), and fixing them via a second fixing tube (11).

6. A gyro system, using the polarization-maintaining beam splitter with filtering function according to any one of claims 1 to 4, characterized in that: include: An ASE light source, a polarization-maintaining beam splitter with a filtering function, a first detector, a second detector, an MIOC modulator, and an optical fiber ring. The polarization-maintaining beam splitter with a filtering function is arranged between the ASE light source and the MIOC modulator to filter, shape, and split the light emitted by the ASE light source. The light is divided into two paths, one path of light is reflected into the first detector for monitoring the stability of the light source, and the other path of light enters the optical fiber ring through the MIOC modulator, passes through the MIOC modulator and the polarization-maintaining beam splitter with a filtering function, and then enters the second detector for analysis as a system signal.

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