CN115683082A - Optical fiber gyroscope without free tail fiber - Google Patents

Abstract

The invention discloses a free-tail-fiber-free optical fiber gyroscope which comprises a bottom plate, an optical chip and an optical fiber ring assembly, wherein the optical chip and the optical fiber ring assembly are integrally arranged on the bottom plate, the optical fiber ring assembly is provided with an interface part, and the interface part is connected with an optical path of the optical chip in a matching mode. The fiber-optic gyroscope provided by the invention has the advantages of small volume and high manufacturing qualification rate, and the optical performance qualification rate and consistency of the fiber-optic gyroscope are improved.

Description

A fiber optic gyroscope without free pigtails

technical field

The invention relates to the technical field of fiber optic gyroscopes, in particular to a fiber optic gyroscope without free tail fibers.

Background technique

As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has its unique technical and performance advantages, such as all-solid-state structure, high reliability, long life; fast start-up speed, short response time; large measurement range and wide dynamic range ; Anti-shock, vibration, chemical corrosion resistance; small size, light weight, low cost; suitable for mass production, etc., have been widely used in various fields.

The existing fiber optic gyroscope optical path is composed of two pigtail fibers of the fiber optic gyroscope integrated system and two pigtail fibers of the fiber optic ring. This docking method has the following disadvantages:

1. The 2 pigtails of the fiber optic gyroscope integrated system and the 2 pigtails of the fiber optic ring are spliced by a fusion splicer. When splicing optical fibers, it is necessary to accurately calculate the number of coils that are exactly coiled in a fixed-size fiber slot. The length and the length of the fusion splicing that allow the fusion to fail several times. Splicing the pigtail is an important and difficult point. The quality of the fusion will affect the fiber performance of the fiber optic gyroscope, which reduces the qualified rate of the fiber optic gyroscope;

2. The two pigtails on the fiber optic gyroscope integrated system and the fiber optic ring are freely exposed, and the free exposed pigtails need to be neatly coiled in the fiber groove of the disk. It needs to be more than 60cm, plus at least 2 times of fusion splicing times, all pigtails are at least 1.2m, plus a small gyro with a diameter of less than 30mm, coiling 10 to 20 times, and the fiber is highly elastic, and it can be coiled back and forth. 2 to 5 times, the pigtail is another important and difficult point. The placement of the pigtail and the tightness of the disk directly affect the overall optical performance of the fiber optic gyroscope, which greatly reduces the pass rate and consistency of the optical performance of the fiber optic gyroscope;

3. Due to dragging 2 exposed free and fragile pigtails, the work of welding and coiling pigtails can only be done manually, which is very unfavorable for mechanized and automated mass production.

4. Due to the uncertainty of welding and pigtailing, the test frequency is greatly increased, the test efficiency is reduced, and the production cycle is lengthened;

5. Dragging two pigtails leads to a relatively large overall volume, which is not conducive to the development trend of the overall miniaturization and miniaturization of the fiber optic ring gyroscope.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a fiber optic gyroscope without free pigtails. The fiber optic gyroscope has a small volume and a high manufacturing pass rate, and improves the pass rate and consistency of the optical performance of the fiber optic gyroscope.

The present invention is realized through the following technical solutions:

A fiber optic gyroscope without free pigtails, comprising a base plate, an optical chip and an optical fiber ring assembly, the optical chip and the optical fiber ring assembly are integrated on the base plate, the optical fiber ring assembly is provided with an interface portion, and the interface portion It is connected with the optical path of the optical chip. The optical chip includes a light source and its electrical interface electrodes, a phase modulator and its electrical interface electrodes, a photodetector and its electrical interface electrodes.

Further, the optical chip includes a fitting, and the fitting is abutted against the interface part.

Further, the adapter includes a first accommodation portion and a first pigtail accommodated in the first accommodation portion, and the interface portion includes a second accommodation portion and a first pigtail partially accommodated in the second accommodation portion. For two pigtails, the first receiving part and the second receiving part are aligned and abutted so that the optical paths of the first pigtail and the second pigtail are butted.

Further, the first accommodating portion includes a pair of first limiting grooves, the second accommodating portion includes a pair of second limiting grooves, the first limiting grooves and the second limiting grooves have the same structure and are In a "V" shape, the two first pigtails are respectively accommodated in a pair of first limiting grooves, and the two second pigtails are respectively accommodated in a pair of second limiting grooves.

Further, a mounting groove and an opening groove are provided on the mounting surface of the bottom plate, the optical chip is fixedly arranged in the mounting groove, and the optical fiber ring assembly is fixedly arranged in the opening groove.

Further, the optical chip further includes a support plate, the fittings are arranged on the support plate, and the top surface of the support plate is coplanar with the mounting surface of the bottom plate.

Further, the optical fiber ring assembly includes a flat plate and an optical fiber ring, the optical fiber ring is fixed on the flat plate by glue, and the flat plate is fixed in the open groove by glue.

Further, the flat plate includes a body part and a protruding part integrally formed with the body part, a part of the underside of the protruding part is attached to the installation surface of the bottom plate, and a part is attached to the top surface of the support plate.

Further, a groove is opened on the body part, and the main body part of the optical fiber ring is bonded in the groove by glue.

Further, the optical fiber ring further includes a second pigtail connected to the main body, and the protruding part and the head of the second pigtail jointly form the interface for connecting with the optical chip.

Further, a deep groove is also provided in the groove, the second pigtail is placed under the main body part, the uncoated part of the second pigtail is fixed in the deep groove, and the second pigtail is fixed in the deep groove. The coated portion of the pigtail is fixed in the second receiving portion.

Further, the flat plate is one of quartz glass, silicon wafer, metal or aluminum oxide wafer and silicon nitride wafer.

Further, the bottom plate is one of quartz glass, silicon wafer, metal or aluminum oxide wafer and silicon nitride wafer.

Further, the fiber optic gyroscope further includes a circuit board, the circuit board is integrated on the base plate, and the optical chip is electrically connected to the circuit board.

Compared with the prior art, the present invention has the advantages of:

1. By fixing the optical chip, the circuit board and the optical fiber ring assembly on the base plate, the optical chip and the circuit board are electrically connected, and the optical fiber ring assembly and the optical chip 2 are abutted so that the optical path of the optical fiber ring assembly 4 and the optical chip 2 is matched. Bring the following technical effects:

(1) The fiber optic gyroscope without free pigtails removes the fusion point and uses a high-precision V-groove array for docking, which ensures the optical performance of the new fiber optic gyroscope and greatly improves the high consistency of the optical performance of the new fiber optic gyroscope. and pass rate;

(2) Fiber optic gyroscopes without free pigtails do not need to deal with a large number of free and exposed fragile pigtails, which greatly facilitates mass production of mechanization and automation;

(3) The optical fiber gyroscope without free pigtail has a compact structure, which improves the packaging technology content of the optical fiber gyroscope without free pigtail.

(4) The fiber optic gyroscope without free pigtails greatly improves the integration of the new fiber optic gyroscope, and lays a technical foundation for the miniaturization and miniaturization of the fiber optic gyroscope.

(5) The fiber optic gyroscope without free tail fiber greatly improves the overall technical level of the new fiber optic gyroscope.

Description of drawings

Fig. 1 is a schematic structural view of a fiber optic gyroscope without free pigtails according to an embodiment of the present invention;

Figure 2 is an enlarged view of part A in Figure 1;

Fig. 3 is an exploded view of a fiber optic gyroscope without free pigtails;

Fig. 4 is an enlarged view of part B in Fig. 3;

Fig. 5 is a structural schematic diagram of an optical fiber ring assembly;

Fig. 6 is an enlarged view of part C in Fig. 5;

Figure 7 is an exploded view of the fiber optic ring assembly;

1. Bottom plate; 10. Installation surface; 11. Installation groove; 12. Opening groove; 120. Limiting surface; 2. Optical chip; , end; 203, inclined plane; 204, first limit groove; 21, support plate; 210, top surface; 3, circuit board; 30, column; 4, optical fiber ring assembly; 40, interface part; Accommodating part; 401, second pigtail; 402, second limiting groove; 41, flat plate; 410, body part; 411, protruding part; 412, groove; 413, side; 414, deep groove; 415, edge ; 42, optical fiber ring; 421, main body; 422, head; 423, coating portion; 424, non-coating portion.

Detailed ways

The following is a further non-limiting detailed description of the technical solution of the invention in conjunction with preferred embodiments and accompanying drawings. In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial direction", "circumferential direction" and the like are based on the orientation or positional relationship shown in the drawings. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless specifically defined otherwise. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in Figures 1-7, a fiber optic gyro without free pigtails according to an embodiment of the present invention includes a base plate 1, an optical chip 2, a circuit board 3 and an optical fiber ring assembly 4, the optical chip 2, the circuit board 3 and The optical fiber ring assembly 4 is integrated on the base plate 1, and the modulator electrodes, light source electrodes, and photodetector electrodes in the optical chip 2 are electrically connected to the corresponding electrical interfaces in the circuit board 3, and the optical fiber ring assembly 4 and the optical chip 2 are abutted so that The optical path of the optical fiber ring assembly 4 and the optical chip 2 is matched.

The mounting surface 10 of the bottom plate 1 is provided with a mounting groove 11 and an opening groove 12, the optical chip 2 is fixedly arranged in the mounting groove 11, and the optical fiber ring assembly 4 is fixedly arranged in the opening groove 12. In this embodiment, the material of the bottom plate 1 is One of quartz glass, silicon wafer or aluminum oxide wafer, silicon nitride wafer and metal, the optical chip 2, the circuit board 3 and the optical fiber ring assembly 4 are fixed by glue bonding.

The open slot 12 includes a limiting surface 120, and the optical fiber ring assembly 4 is in contact with the limiting surface 120. During the test, the optical fiber ring assembly 4 is placed in the open slot 12, and the optical fiber ring assembly 4 is slowly pushed along the side of the open slot 12. Close to the optical chip 2 , finally make the joint 20 of the optical chip 2 and the interface portion 40 of the optical fiber ring assembly 4 seamlessly connect with each other.

The optical chip 2 includes a joint 20 and a support plate 21, the joint 20 is fixedly arranged on the support plate 21, the support plate 21 is accommodated in the installation groove 11 and the top surface 210 of the support plate 21 is coplanar with the installation surface 10 of the bottom plate 1, Specifically, the back of the support plate 21 is fixed in the installation groove 11 by glue. The end 202 of the fitting 20 has an inclined surface 203, and the inclined surface 203 can be in any direction and any inclination angle, without specific limitation, as long as the end 202 of the fitting 20 and the interface portion 40 are seamlessly bonded together, this embodiment Among them, the slope 203 is thrown into an angle of 8 degrees up and down or 8 degrees left and right to prevent reflected light from entering the optical fiber.

The adapter 20 includes a first receiving portion 200 and a first pigtail 201 , and the first pigtail 201 is accommodated in the first receiving portion 200 .

The first receiving part 200 includes a pair of first limiting grooves 204, and the distance between the pair of first limiting grooves 204 is not specifically limited. In this embodiment, the first limiting grooves 204 are in a "V" shape. The first pigtails 201 are accommodated in a pair of first limiting slots 204 respectively.

A plurality of uprights 30 are distributed on the circuit board 3 , and the circuit board 3 is fixed on the mounting surface 10 of the bottom plate 1 through the uprights 30 glued on.

The optical fiber ring assembly 4 includes a flat plate 41 and an optical fiber ring 42 , the optical fiber ring 42 is fixed on the flat plate 41 by glue, and the flat plate 41 is fixed in the open groove 12 by glue. The material of the plate 41 is one of quartz glass, silicon wafer, metal or aluminum oxide wafer and silicon nitride wafer.

The optical fiber ring 42 includes a second pigtail 401 and a main body 421, the main body 421 and the flat plate 41 are bonded by glue, the flat plate 41 is provided with a second accommodation portion 400, and at least part of the second pigtail 401 is fixedly arranged in the second accommodation portion In 400, the flat plate 41 and the head 422 of the second pigtail 401 jointly form the interface part 40 for docking with the optical chip 2, and the matching joint 20 and the interface part 40 abut against each other, so that the optical fiber ring assembly 4 and the optical chip 2 are optically connected. .

The flat plate 41 includes a body part 410 and a protruding part 411 integrally formed with the body part 410 , a part of the lower side of the protruding part 411 is attached to the installation surface 10 , and a part is attached to the top surface 210 of the support plate 21 . The body part 410 is provided with a groove 412, the main body part 421 of the optical fiber ring 42 is bonded in the groove 412 by glue, the second receiving part 400 is arranged on the body part 410 and the protruding part 411 and the second receiving part 400 One end communicates with the groove 412, and the other end extends to the edge 415 of the protruding part 411. Part of the second pigtail 401 on the fiber ring 42 is accommodated in the second receiving part 400. In this implementation, part of the second pigtail 401 is glued Bonding in the second containing part 400, specifically, the second pigtail 401 includes a coated layer part 423 and an uncoated layer part 424, and the coated layer part 423 is a bare fiber with the coating layer removed and passed through the glue Adhering to the second receiving portion 400 , one end of the uncoated portion 424 is connected to the coated portion 423 . The other end is connected to the main body 421 of the optical fiber ring 42 .

A deep groove 414 is also provided in the groove 412. Specifically, when the flat plate 41 and the fiber ring 42 are fixedly installed, the second pigtail 401 is placed under the main body 421, and the uncoated part 424 of the second pigtail 401 is fixed in the deep groove 412. In the groove 414 , the coated portion 423 of the second pigtail 401 is fixed in the second receiving portion 400 .

The protruding portion 411 and the head portion 422 of the second pigtail 401 jointly form an interface portion 40 for docking with the optical chip 2 , and the connector 20 abuts against the interface portion 40 . During docking, the body portion 410 is in contact with the limiting surface 120 of the slot 12 , and the protruding portion 411 is in contact with the inclined surface 203 of the end portion 202 of the fitting 20 .

The interface part 40 includes a second housing part 400 and a second pigtail 401 partially accommodated in the second housing part 400, the first housing part 200 and the second housing part 400 are aligned and abutted so that the first pigtail 201 and the second pigtail 201 The fiber 401 optical path is connected.

The second receiving part 400 includes a pair of second limiting grooves 402, the second limiting grooves 402 and the first limiting grooves 204 have the same structure and are in a "V" shape, and the two second pigtails 401 are respectively accommodated in a pair of first limiting grooves. In the two limiting grooves 402 , the first limiting groove 204 and the second limiting groove 402 are aligned and abutted so that the optical paths of the first pigtail 201 and the second pigtail 401 are butted.

By fixing the optical chip 2, the circuit board 3 and the optical fiber ring assembly 4 on the base plate 1 by glue, the optical fiber ring assembly 4 and the optical chip 2 are abutted so that the optical path of the optical fiber ring assembly 4 and the optical chip 2 is matched. Glue the lower side of the flat plate 41 to ensure that the side surface 413 of the body part 410 of the flat plate 41 fits the limit surface 120 of the opening groove 12, and the lower side of the protruding part 411 of the flat plate 41 fits the installation surface 10 partially, and partially fits the support The top surface 210 of the board 21 and the edge 415 of the protruding portion 411 are in contact with the slope 203 of the end 202 of the mating connector 20 , so as to achieve optical connection between the first pigtail 201 and the second pigtail 401 .

The present invention brings following technical effect:

(1) The fiber optic gyroscope without free pigtails removes the fusion point and uses a high-precision V-groove array for docking, which ensures the optical performance of the new fiber optic gyroscope and greatly improves the high consistency of the optical performance of the new fiber optic gyroscope. and pass rate;

(2) Fiber optic gyroscopes without free pigtails do not need to deal with a large number of free and exposed fragile pigtails, which greatly facilitates mass production of mechanization and automation;

(3) The optical fiber gyroscope without free pigtail has a compact structure, which improves the packaging technology content of the optical fiber gyroscope without free pigtail.

(4) The fiber optic gyroscope without free pigtails greatly improves the integration of the new fiber optic gyroscope, and lays a technical foundation for the miniaturization and miniaturization of the fiber optic gyroscope.

(5) The fiber optic gyroscope without free tail fiber greatly improves the overall technical level of the new fiber optic gyroscope.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (14)

1. A fiber optic gyroscope without free pigtails is characterized in that it comprises a base plate (1), an optical chip (2) and an optical fiber ring assembly (4), and the optical chip (2) and the optical fiber ring assembly (4) are integrated It is arranged on the bottom plate (1), and the optical fiber ring assembly (4) is provided with an interface part (40), and the interface part (40) is matched with the optical path of the optical chip (2). 2 . The fiber optic gyroscope according to claim 1 , characterized in that, the optical chip ( 2 ) comprises a fitting ( 20 ), and the fitting ( 20 ) abuts against the interface portion ( 40 ). 3 . 3. The fiber optic gyroscope according to claim 2, characterized in that, the adapter (20) comprises a first accommodation portion (200) and a first pigtail (200) contained in the first accommodation portion (200) 201), the interface part (40) includes a second accommodation part (400) and a second pigtail (401) partially accommodated in the second accommodation part (400), the first accommodation part (200) Aligning and abutting with the second receiving part (400) makes the optical paths of the first pigtail (201) and the second pigtail (401) butt. 4. The fiber optic gyroscope according to claim 3, characterized in that, the first housing portion (200) includes a pair of first limiting grooves (204), and the second housing portion (400) includes a pair of first Two limiting grooves (402), the first limiting groove (204) and the second limiting groove (402) have the same structure and are in a "V" shape, and the two first pigtails (201) are respectively accommodated in a pair of In the first limiting groove (204), the two second pigtails (401) are respectively accommodated in a pair of second limiting grooves (402). 5. The fiber optic gyroscope according to claim 3, characterized in that, the mounting surface (10) of the base plate (1) is provided with a mounting groove (11) and an opening groove (12), and the optical chip (2) The optical fiber ring assembly (4) is fixedly arranged in the opening groove (12). 6. The fiber optic gyroscope according to claim 5, characterized in that, the optical chip (2) also includes a support plate (21), the fitting (20) is arranged on the support plate (21), and the support plate (21) The top surface (210) of the board (21) is coplanar with the mounting surface (10) of the bottom plate (1). 7. The fiber optic gyroscope according to claim 6, characterized in that, the fiber optic ring assembly (4) comprises a flat plate (41) and a fiber optic ring (42), and the fiber optic ring (42) is fixed on the flat plate (41) by glue. ), the flat plate (41) is fixed in the open groove (12) by glue. 8. The fiber optic gyroscope according to claim 7, characterized in that, the flat plate (41) comprises a body portion (410) and a protruding portion (411) integrally formed with the body portion (410), the protruding portion A part of the lower side of (411) is attached to the installation surface (10) of the bottom plate (1), and a part is attached to the top surface (210) of the support plate (21). 9. The fiber optic gyro according to claim 8, characterized in that a groove (412) is provided on the body portion (410), and the body portion (421) of the fiber optic ring (42) is bonded to the groove by glue. (412). 10. The fiber optic gyroscope according to claim 9, characterized in that, the fiber optic ring (42) further comprises a second pigtail (401) connected to the main body (421), and the protruding portion (411 ) and the head (422) of the second pigtail (401) jointly form the interface portion (40) for docking with the optical chip (2). 11. The fiber optic gyroscope according to claim 10, characterized in that, a deep groove (414) is also provided in the groove (412), and the second pigtail (401) is placed on the main body (421 ) below, the uncoated portion (424) of the second pigtail (401) is fixed in the deep groove (414), and the uncoated portion (423) of the second pigtail (401) is fixed in In the second accommodation part (400). 12. The fiber optic gyroscope according to claim 7, characterized in that, the flat plate (41) is one of quartz glass, silicon wafer, metal or aluminum oxide wafer and silicon nitride wafer. 13. The fiber optic gyroscope according to claim 1, characterized in that, the bottom plate (1) is one of quartz glass, silicon wafer, metal or aluminum oxide wafer and silicon nitride wafer. 14. The fiber optic gyroscope according to claim 1, characterized in that, the fiber optic gyroscope further comprises a circuit board (3), the circuit board (3) is integrated on the base plate (1), and the optical chip (2) is electrically connected with the circuit board (3).

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