Multi-axial multi-fiber ring series structure and series connection method and gyroscope optical path component

Abstract

The present invention discloses a multi-axial multi-fiber ring series structure and series connection method and a gyroscope optical path component, belonging to the field of fiber optic gyroscope technology, and solves the problem of cumbersome operation and high winding difficulty of the fiber optic ring group in the prior art; the multi-axial multi-fiber ring series structure includes a mother fiber optic ring, and a plurality of sub-fiber optic rings are connected in series on the pigtail of the mother fiber optic ring. In the present invention, multiple sections of optical fiber are used to wind the sub-fiber optic rings respectively, and after winding, the plurality of sub-fiber optic rings are connected in series on the mother fiber optic ring in sequence to complete the series combination; this structural design reduces the winding difficulty of the fiber optic ring group, and can also extend the overall length of the optical fiber by increasing the number of sub-fiber optic rings, thereby ensuring the accuracy of the fiber optic gyroscope; the mother fiber optic ring and the sub-fiber optic ring are both independently wound using a conventional multi-pole symmetrical winding process, without the need for a special winding process and special fixtures, with low operating difficulty, and no risk of fiber breakage during winding, transportation, testing and installation.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber optic gyroscopes, and in particular to a multi-axial multi-fiber ring series connection structure and a series connection method, and a gyroscope optical path component. Background Art

[0002] Due to its advantages of miniaturization and high precision, three-axis fiber optic gyroscopes have been widely used in aviation, aerospace, civil and other fields. In order to meet the application requirements of various usage scenarios, the structure of the three-axis fiber optic gyroscope needs to be changed accordingly. For example, when the use environment of the three-axis fiber optic gyroscope is limited to a narrow and long pipe, the fiber optic ring group on at least two axes inside it needs to be designed as a runway-type fiber optic ring skeleton due to structural size limitations. In some usage environments, the aspect ratio of the runway-type fiber optic ring skeleton may even be greater than 6. If this skeleton is used to wind the fiber optic ring, it will not only increase the difficulty of winding the fiber optic ring, but also cause the assembled fiber optic gyroscope to have poor accuracy due to uneven tension distribution during the winding process.

[0003] The existing method for connecting multiple fiber rings in series is to use a complete fiber to complete all fiber rings through a four-level symmetrical winding method. This winding method has the following technical defects:

[0004] When winding a single optical fiber in series, multiple optical fiber ring frames must be fixed to the ring winding equipment at the same time. Therefore, high-precision special tooling fixtures must be designed to ensure the coaxiality of multiple optical fiber ring frames, which is a relatively cumbersome operation. The optical fiber required for winding a single optical fiber in series is relatively long, and the optical fiber must repeatedly cross multiple frame edges during winding, which increases the difficulty of winding and easily causes the optical fiber to break. Once the optical fiber breaks, the wound optical fiber and the optical fiber to be wound cannot be reused. The requirements for winding a single optical fiber in series are high. To ensure the accuracy of the gyroscope, it is necessary to first ensure that the reciprocity of the wound optical fiber ring meets the requirements. That is, the length of the optical fiber wound on the optical fiber ring frame in the clockwise and counterclockwise directions of a single optical fiber must be exactly the same. For a single optical fiber in series, not only the total clockwise and counterclockwise optical fiber lengths must be equal, but the clockwise and counterclockwise optical fiber winding lengths distributed on each series frame must also be completely consistent. The fabrication and installation of a single fiber optic tandem loop is challenging and requires a long production cycle. Each completed fiber optic loop weighs tens of grams, and each loop is connected only by two fiber pigtails. Therefore, reliable securing of the loop is crucial during operation and installation. The assembly of a single fiber optic tandem loop must ensure concentricity and symmetry. Otherwise, non-reciprocal phase shifts will occur, impacting the performance of the fiber optic gyroscope. Therefore, this method is only suitable for single-axis fiber optic gyroscopes. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention provides a multi-axial multi-fiber ring series structure and series connection method and a gyroscope optical path assembly, which solves the problems in the prior art of cumbersome operation and great difficulty in winding the fiber ring group.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0007] A multi-axial multi-fiber ring series structure comprises a mother fiber ring and a plurality of sub-fiber rings, wherein the sub-fiber rings are sequentially connected in series to the pigtails of the mother fiber ring.

[0008] In this solution, multiple sections of optical fiber are used to wind sub-fiber rings separately. After winding, multiple sub-fiber rings are connected in series on the mother fiber ring to complete the series combination. This structural design reduces the difficulty of winding the fiber ring group and can also extend the overall length of the optical fiber by increasing the number of sub-fiber rings, thereby ensuring the accuracy of the fiber optic gyroscope.

[0009] In a second aspect, the present invention provides a multi-axial multi-fiber ring series connection method based on the multi-axial multi-fiber ring series connection structure provided in the first aspect, comprising the following steps:

[0010] Step 1: Use an optical fiber of length L to wind a mother optical fiber ring using a multi-pole symmetrical winding method. After winding, the mother optical fiber ring outputs two pigtails.

[0011] Step 2: Use two optical fibers of length L / 2 to wind a sub-fiber ring using a multi-pole symmetrical winding method. One fiber is wound in a clockwise direction throughout, and the other fiber is wound in a counterclockwise direction throughout. After winding, connect the sub-fiber ring in series to the two pigtails of the mother fiber ring.

[0012] Step 3: Connect the next sub-fiber ring in series on the sub-fiber ring. The total fiber ring length after series connection is (N+1)L, where N is the number of sub-fiber rings.

[0013] In this solution, multiple sub-fiber rings are wound in the same way, and multiple winding machines can simultaneously perform the winding work of the fiber ring group required for a fiber optic gyroscope. For small-batch production, this method can significantly shorten the processing cycle and improve efficiency.

[0014] Furthermore, the two pigtails output by the mother fiber optic ring are the first pigtail and the second pigtail; the pigtails output by one of the optical fibers wound around the sub-fiber optic ring are the third pigtail and the fourth pigtail, and the pigtails output by the other optical fiber are the fifth pigtail and the sixth pigtail; when the mother fiber optic ring and the sub-fiber optic ring are connected in series, a fusion splicer is used to fusion-splice the first pigtail with the third pigtail, and to fusion-splice the second pigtail with the fifth pigtail.

[0015] Furthermore, melting point protection sleeves are provided at the fusion points between the first pigtail and the third pigtail and at the fusion points between the second pigtail and the fifth pigtail.

[0016] In this solution, the melting point protection sleeve can protect the optical fiber connection from being damaged by external physical factors, thereby maintaining the accuracy and stability of optical fiber transmission.

[0017] In a third aspect, the present invention provides a gyroscope optical path assembly, comprising a mounting base, on which are mounted a panning axis fiber optic ring group, a pitch axis fiber optic ring group, and a roll axis fiber optic ring group; wherein the panning axis fiber optic ring group, the pitch axis fiber optic ring group, and the roll axis fiber optic ring group are all prepared by the multi-axial multi-fiber ring series connection method provided in the second aspect above.

[0018] Furthermore, the output pigtail of the panning axis optical fiber ring group is connected to a first Y-waveguide, which is fused to a first coupler; the two ports of the first coupler are fused to a first detector and a fourth coupler respectively;

[0019] The output pigtail of the pitch axis optical fiber ring group is connected to a second Y-waveguide, which is fused to a second coupler; the two ports of the second coupler are fused to a second detector and a fourth coupler respectively;

[0020] The output pigtail of the rolling axis optical fiber ring group is connected to a third Y-waveguide, which is fused to a third coupler; the two ports of the third coupler are fused to a third detector and a fourth coupler respectively; and the fourth coupler is fused to a light source;

[0021] The light source is connected to the circuit board through wires.

[0022] Furthermore, the mounting base is provided with a circuit board mounting surface and a light source mounting groove, the circuit board is mounted on the circuit board mounting surface, and the light source is mounted in the light source mounting groove; a first wire groove and a second wire groove are provided between the circuit board mounting surface and the light source mounting groove, and wires connected to the circuit board and the light source are distributed in the first wire groove and the second wire groove;

[0023] A fourth coupler is also installed in the light source installation groove, and the optical fibers of each axis pass through the optical fiber grooves at both ends of the light source installation groove and are connected to the fourth coupler.

[0024] Furthermore, the ends of the optical fiber slots are designed with rounded corners.

[0025] In this solution, the rounded corners prevent damage to the optical fiber.

[0026] Furthermore, the first Y-waveguide, the first coupler and the first detector are all arranged on the fiber ring skeleton of the last sub-fiber ring connected in series in the panning axis fiber ring group.

[0027] The beneficial effects of the present invention are:

[0028] The multi-axial multi-fiber ring series structure provided by the present invention utilizes a mother fiber ring paired with multiple sub-fiber rings to complete the series combination. The multiple sub-fiber rings can be wound from multiple sections of optical fiber, reducing the winding difficulty and providing better control of the geometric center compared to winding with a single optical fiber. In the multi-axial multi-fiber ring series method, each sub-fiber ring is wound using two optical fibers using a conventional multi-stage symmetrical method, requiring no special operating procedures or equipment. The sub-fiber rings are fused to the mother fiber ring, resulting in production efficiency that is more than three times higher than traditional series methods. This eliminates the problem of the entire ring being scrapped due to fiber breakage during continuous multi-frame winding of long optical fibers in traditional series methods.

[0029] Both the mother and daughter fiber rings are independently wound using a conventional multi-pole symmetrical winding process, eliminating the need for specialized winding techniques and fixtures. Operation is simplified, and there's no risk of fiber breakage during winding, transportation, testing, or installation. The geometric centers of the mother and daughter fiber rings coincide with their optical centers, meeting reciprocity requirements and avoiding the limitation of single-fiber serial rings requiring coaxial winding. Both the mother and daughter fiber rings are interchangeable, effectively reducing production costs. This improves the environmental adaptability of serial fiber rings, addressing the issue of insufficient fiber ring precision in fiber optic gyroscopes designed for use in confined spaces, and achieving test accuracy close to theoretical values. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of a multi-axial multi-fiber ring series structure of the present invention;

[0031] Figure 2 It is a front view of a gyroscope optical path component of the present invention;

[0032] Figure 3 It is a left side view of a gyroscope optical path component of the present invention;

[0033] Figure 4 It is a rear view of a gyroscope optical path component of the present invention;

[0034] Figure 5 This is a schematic diagram of a gyroscope optical path component of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the installation base in the present invention;

[0036] Figure 7 Schematic diagram of the structure of the pan axis optical fiber ring group in the present invention;

[0037] Figure 8 It is a structural schematic diagram of the pitch axis optical fiber ring group in the present invention.

[0038] Reference numerals:

[0039] 1. Mother fiber ring; 2. Daughter fiber ring; 3. First pigtail; 4. Second pigtail; 5. Third pigtail; 6. Fifth pigtail; 7. Fourth pigtail; 8. Sixth pigtail; 9. Melting point protection sleeve; 11. Pan axis fiber ring assembly; 111. First Y-waveguide; 112. First coupler; 113. First detector; 12. Pitch axis fiber ring assembly; 121. Second Y-waveguide; 122. Second coupler; 123. Second detector; 13. Roll axis fiber ring assembly; 131. Third Y-waveguide; 132. Third coupler; 133. Third detector; 14. Fourth coupler; 15. Circuit board; 16. Light source; 17. Fiber ring frame; 18. Mounting base; 181. First wire trough; 182. Fiber trough; 183. Second wire trough; 184. Circuit board mounting surface; 185. Light source mounting slot. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a multi-axial multi-fiber ring series structure, which uses a mother fiber ring 1 to connect multiple sub-fiber rings 2 in series to reduce the difficulty of winding the fiber ring group; it specifically includes:

[0043] A mother fiber optic ring 1 and several daughter fiber optic rings 2; several daughter fiber optic rings 2 are connected in series on the pigtail of the mother fiber optic ring 1; the fiber optic ring group designed is easy to wind, and the fiber is not easy to break compared to the single fiber winding method. The overall length of the fiber can be extended by increasing the number of daughter fiber optic rings 2, thereby ensuring the accuracy of the fiber optic gyroscope.

[0044] Example 2

[0045] like Figure 1 As shown, this embodiment provides a multi-axial multi-fiber ring series connection method based on the multi-axial multi-fiber ring series connection structure provided in Example 1, including the following steps:

[0046] Step 1: Use an optical fiber with a length of L to wind a mother optical fiber ring 1 according to a multi-pole symmetrical winding method. After winding, the mother optical fiber ring 1 outputs two pigtails, which are a first pigtail 3 and a second pigtail 4.

[0047] Step 2: Use two optical fibers of length L / 2 to wind a sub-fiber ring 2 using a multipolar symmetrical winding method. One optical fiber is wound in a clockwise direction throughout, and after winding, a third pigtail 5 and a fourth pigtail 7 are output. The other optical fiber is wound in a counterclockwise direction throughout, and after winding, a fifth pigtail 6 and a sixth pigtail 8 are output.

[0048] After winding, the sub-fiber ring 2 is connected in series to the two pigtails of the mother fiber ring 1; when the mother fiber ring 1 and the sub-fiber ring 2 are connected in series, a fusion splicer is used to fuse the first pigtail 3 with the third pigtail 5, and to fuse the second pigtail 4 with the fifth pigtail 6; after fusion splicing, a melting point protection sleeve 9 is set at the fusion point between the first pigtail 3 and the third pigtail 5 and the fusion point between the second pigtail 4 and the fifth pigtail 6. The melting point protection sleeve 9 can protect the optical fiber connection from being damaged by interference from external physical factors, thereby maintaining the accuracy and stability of optical fiber transmission.

[0049] To meet the performance requirements of the fiber optic gyroscope, the welding quality of the welding points needs to be checked after welding, and the welding angle of each welding point must be ≤1°.

[0050] Step 3: Connect the next sub-fiber ring 2 in series on the sub-fiber ring 2. The total fiber ring length after the series connection is (N+1)L, where N is the number of sub-fiber rings 2, and N≥2.

[0051] In this embodiment, the winding method of multiple sub-fiber rings 2 is the same, and multiple winding machines can simultaneously perform the winding work of the fiber ring group required for a fiber optic gyroscope. For small-batch production, this method can significantly shorten the processing cycle and improve efficiency.

[0052] Example 3

[0053] like Figure 2-Figure 4 As shown, this embodiment provides a gyroscope optical path assembly, including a mounting base 18 and a panning axis fiber optic ring group 11, a pitch axis fiber optic ring group 12, and a roll axis fiber optic ring group 13 mounted on the mounting base 18; wherein, the panning axis fiber optic ring group 11, the pitch axis fiber optic ring group 12, and the roll axis fiber optic ring group 13 are all prepared by the multi-axial multi-fiber ring series connection method provided in the above-mentioned embodiment 2.

[0054] like Figure 5As shown, the gyroscope optical path assembly also includes a first Y-waveguide 111, a first coupler 112, a first detector 113, a second Y-waveguide 121, a second coupler 122, a second detector 123, a third Y-waveguide 131, a third coupler 132, a third detector 133, a fourth coupler 14, a circuit board 15, and a light source 16. The first Y-waveguide 111 is connected to the output pigtail of the panning axis fiber ring assembly 11, and the first Y-waveguide 111 is fused to the first coupler 112. The first detector 113 and the fourth coupler 14 are fused to the two ports of the first coupler 112, respectively. The second Y-waveguide 121 is connected to the output pigtail of the pitch axis fiber ring assembly 12, and the second Y-waveguide 121 is fused to the second coupler 122. The second detector 123 and the fourth coupler 14 are fused to the two ports of the second coupler 122, respectively. The output pigtail of the roll axis fiber ring group 13 is connected to a third Y-waveguide 131, which is fused to a third coupler 132. A third detector 133 and a fourth coupler 14 are fused to the two ports of the third coupler 132, respectively. The fourth coupler 14 is fused to a light source 16. The light source 16 is connected to a circuit board 15 via a wire.

[0055] In this embodiment, the first coupler 112 , the second coupler 122 , and the third coupler 132 are all 2×2 fiber couplers; and the fourth coupler 14 is a 1×3 fiber coupler.

[0056] like Figure 6 As shown, a circuit board mounting surface 184 and a light source mounting groove 185 are provided on the mounting base 18, the circuit board 15 is mounted on the circuit board mounting surface 184, and the light source 16 is mounted in the light source mounting groove 185; a first wire groove 181 and a second wire groove 183 are provided between the circuit board mounting surface 184 and the light source mounting groove 185, and the wires connected to the circuit board 15 and the light source 16 are distributed in the first wire groove 181 and the second wire groove 183; a fourth coupler 14 is also installed in the light source mounting groove 185, and each axis optical fiber passes through the optical fiber grooves 182 at both ends of the light source mounting groove 185 and is connected to the fourth coupler 14.

[0057] The end of the optical fiber groove 182 adopts a rounded corner design, which can prevent damage to the optical fiber.

[0058] like Figure 7 As shown, when fusing the navigation axis optical fiber ring group 11, the mother optical fiber ring 1 is placed at the bottom with the fiber coil facing upward. The center holes need to coincide when placing it, and the positions of each device are consistent. The sub-optical fiber rings 2 are stacked vertically upward in sequence, and then a fusion splicer is used to fuse the mother optical fiber ring 1 and the sub-optical fiber ring 2 in the navigation axis optical fiber ring group 11.

[0059] like Figure 8As shown, when the pitch axis fiber ring group 12 and the roll axis fiber ring group 13 are fused, the fiber rings are placed in a horizontally equidistant array, and the melting point protection sleeves 9 at different positions are on the same horizontal line, and then a fusion splicer is used for fusion splicing.

[0060] In the panning axis fiber ring group 11, the first Y-waveguide 111, the first coupler 112 and the first detector 113 are all arranged on the fiber ring skeleton 17 of the last sub-fiber ring 2 connected in series in the panning axis fiber ring group 11; the arrangement method of the pitch axis fiber ring group 12 and the roll axis fiber ring group 13 is similar.

[0061] Example 4

[0062] This embodiment conducts an experimental comparison between a gyroscope optical path component provided in Embodiment 3 and an optical fiber ring assembly wound with a single optical fiber.

[0063] The pan-axis fiber optic ring group 11, pitch-axis fiber optic ring group 12, and roll-axis fiber optic ring group 13 selected in this test all use a mother fiber optic ring 1 connected in series with three daughter fiber optic rings 2. The total length of the optical fiber is 2640m, and the diameter of the wound fiber optic ring is 60mm. Each fiber optic ring group was placed in the same test environment for test comparison. The test data comparison is shown in Tables 1, 2, and 3.

[0064] Table 1 Comparison of fiber ring group data in different serial connection methods at room temperature (25°C)

[0065]

[0066] As can be seen from the above table, the traditional fiber optic ring assembly wound with a single optical fiber can only meet the requirements of a single-axis fiber optic gyroscope. However, the fiber optic ring assembly prepared by the multi-axial multi-fiber ring series connection method of the present invention not only meets the requirements of a multi-axial fiber optic gyroscope, but also the zero-bias stability of the structure and method of the present invention is significantly better than that of the traditional method at room temperature (25°C). At the same time, other test data meet the required values.

[0067] Table 2 Comparison of fiber ring group data in different serial connection methods under low temperature (-45℃) environment

[0068]

[0069] As can be seen from the above table, the zero bias stability of the optical fiber ring assembly prepared by the present invention is better than that of the optical fiber ring assembly prepared by the traditional method in a low temperature environment (-45°C), and other test data meet the required values.

[0070] Table 3 Comparison of fiber ring group data in different serial connection methods under high temperature (70°C) environment

[0071]

[0072] As can be seen from the above table, the zero bias stability of the optical fiber ring assembly prepared by the present invention is better than that of the optical fiber ring assembly prepared by the traditional method in a high temperature environment (70°C), and other test data meet the required values.

[0073] Based on the comparison of the above three sets of data, it is concluded that the new multi-axial multi-fiber ring series structure and series method of the present invention are not only more applicable than the traditional method, but also better than the traditional method in terms of data under full-temperature test environment, meeting the performance index requirements of current products.

[0074] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the invention.

Claims

1. A method for serial connection of a multi-axial multi-fiber ring serial structure, comprising a mother fiber ring (1) and a plurality of sub-fiber rings (2), wherein the plurality of sub-fiber rings (2) are serially connected to the pigtails of the mother fiber ring (1); characterized in that: The following steps are involved: Step 1: Using an optical fiber of length L, a mother optical fiber ring (1) is wound according to a multi-pole symmetrical winding method, and after winding, the mother optical fiber ring (1) outputs two pigtails; Step 2: Use two optical fibers of length L / 2 to wind a sub-fiber ring (2) in a multi-pole symmetrical winding method, wherein one optical fiber is wound in a clockwise direction throughout, and the other optical fiber is wound in a counterclockwise direction throughout; after winding, connect the sub-fiber ring (2) in series to the two pigtails of the mother optical fiber ring (1); Step 3: Connect the next sub-fiber ring (2) in series on the sub-fiber ring (2), and the total fiber ring length after the series connection is (N+1)L, where N is the number of sub-fiber rings; use multiple sections of optical fiber to wind the sub-fiber rings (2) respectively, and after winding, connect the multiple sub-fiber rings (2) in series on the mother fiber ring (1) in sequence to complete the series combination.

2. The method for serial connection of a multi-axial multi-fiber ring structure according to claim 1, characterized in that: The two pigtails outputted from the mother optical fiber ring (1) are respectively a first pigtail (3) and a second pigtail (4); the pigtails outputted from one of the optical fibers wound around the daughter optical fiber ring (2) are a third pigtail (5) and a fourth pigtail (7), and the pigtails outputted from the other optical fiber are a fifth pigtail (6) and a sixth pigtail (8); When the mother optical fiber ring (1) and the daughter optical fiber ring (2) are connected in series, a fusion splicer is used to fusion splice the first pigtail (3) with the third pigtail (5), and to fusion splice the second pigtail (4) with the fifth pigtail (6).

3. The method for serial connection of a multi-axial multi-fiber ring structure according to claim 2, characterized in that: The fusion point between the first pigtail (3) and the third pigtail (5) and the fusion point between the second pigtail (4) and the fifth pigtail (6) are provided with a melting point protection sleeve (9).

4. A gyroscope optical path assembly, comprising a mounting base (18), on which a panning axis optical fiber ring group (11), a pitch axis optical fiber ring group (12), and a roll axis optical fiber ring group (13) are mounted; characterized in that: The panning axis optical fiber ring group (11), the pitching axis optical fiber ring group (12), and the rolling axis optical fiber ring group (13) are all prepared by the series connection method of the multi-axial multi-optical fiber ring series structure according to claim 1; The output pigtail of the navigation axis optical fiber ring group (11) is connected to a first Y-waveguide (111), and the first Y-waveguide (111) is fused to a first coupler (112); a first detector (113) and a fourth coupler (14) are fused to two ports of the first coupler (112), respectively; The output pigtail of the pitch axis optical fiber ring group (12) is connected to a second Y-waveguide (121), and the second Y-waveguide (121) is fused to a second coupler (122); a second detector (123) and a fourth coupler (14) are fused to two ports of the second coupler (122), respectively; The output pigtail of the roll axis optical fiber ring group (13) is connected to a third Y-waveguide (131), and the third Y-waveguide (131) is fused to a third coupler (132); a third detector (133) and a fourth coupler (14) are fused to two ports of the third coupler (132), respectively; and the fourth coupler (14) is fused to a light source (16); The light source (16) is connected to the circuit board (15) via a wire; The mounting base (18) is provided with a circuit board mounting surface (184) and a light source mounting groove (185); the circuit board (15) is mounted on the circuit board mounting surface (184), and the light source (16) is mounted in the light source mounting groove (185); a first wire groove (181) and a second wire groove (183) are provided between the circuit board mounting surface (184) and the light source mounting groove (185); wires connected to the circuit board (15) and the light source (16) are distributed in the first wire groove (181) and the second wire groove (183); The fourth coupler (14) is also installed in the light source installation groove (185), and the optical fibers of each axis pass through the optical fiber grooves (182) at both ends of the light source installation groove (185) and are connected to the fourth coupler (14); When the operating environment of a three-axis fiber optic gyroscope is limited to a narrow and long pipe, the fiber optic ring groups on at least two axes inside it need to be designed as a runway-type fiber optic ring skeleton due to structural size restrictions. The gyroscope optical path assembly improves the environmental adaptability of the serial fiber optic rings and solves the problem of insufficient fiber optic ring accuracy in fiber optic gyroscopes suitable for narrow spaces.

5. The gyroscope optical path component according to claim 4, characterized in that: The end of the optical fiber groove (182) adopts a rounded corner design.

6. The gyroscope optical path component according to claim 4, characterized in that: The first Y-waveguide (111), the first coupler (112), and the first detector (113) are all arranged on a fiber ring skeleton (17) of the last sub-fiber ring (2) connected in series in the panning axis fiber ring group (11).

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