Metallized optical fiber fixing block assembly and method for first metallization and then grinding and polishing

Abstract

The invention discloses a metallized optical fiber fixing block assembly and a method for metallizing and then grinding and polishing, belongs to the field of integrated optical devices, and comprises an optical fiber ribbon metallization axis fixing technology and an optical fiber fixing block assembly ribbon metallization grinding and polishing technology. The metalized optical fiber fixing block assembly is mainly applied to optical path coupling of a three-in-one device, an optical fiber coating layer about 20 mm in the head of the optical fiber fixing block assembly is stripped firstly, the optical fiber coating layer 8 mm in length is metalized, and fixed-axis grinding and polishing operation is performed after metallization, so that airtight packaging of the coupled optical fiber fixing block assembly is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of integrated optical devices and relates to a metallized optical fiber fixing block component and a method of first metallizing and then grinding and polishing. Background Art

[0002] The three-in-one is a new type of device that integrates the light source, coupler and detector in one module in the closed-loop fiber optic gyroscope optical path. With the increasing demand for medium and low precision fiber optic gyroscopes and the lower prices of medium and low precision fiber optic gyroscopes, the development of three-in-one devices can greatly improve the efficiency of gyroscope optical path assembly and reduce production costs. The current fiber optic gyroscope optical path assembly requires the light source, detector and coupler to be fused separately for assembly, which is completely dependent on manual labor, with low assembly efficiency and high assembly cost. Integrating the three optical devices into a three-in-one device can improve production efficiency to meet the needs of medium and low precision fiber optic gyroscopes. Summary of the invention

[0003] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and provide a metallized optical fiber fixing block assembly and a method of metallization followed by polishing to meet the optical path coupling and reliability requirements of a three-in-one device.

[0004] The technical solutions provided by this application are as follows:

[0005] A method for first metalizing and then polishing a metalized optical fiber fixing block assembly comprises:

[0006] The fiber coating is stripped off the head of one end of the optical fiber to obtain a bare fiber, and a section of the bare fiber close to the optical fiber coating is metalized to obtain a metallized optical fiber, and the end of the bare fiber away from the optical fiber coating is a non-metallized bare fiber;

[0007] The capillary is provided with a through hole for the unmetallized bare fiber to pass through, and the unmetallized bare fiber is passed through the capillary until the end of the metallized optical fiber passes through the capillary, and the metallized optical fiber and the capillary are fixed at the flare position by UV to obtain the optical fiber fixing block assembly after axis fixing;

[0008] The optical fiber fixing block assembly after axis fixing is installed on the grinding and polishing fixture, and finally the end face of the capillary is ground and polished to obtain the polished part;

[0009] A nickel tube is welded to the metallized optical fiber of the polished part.

[0010] The length of the metallized optical fiber is 8 mm±0.1 cm.

[0011] The length of the unmetallized bare fiber is greater than the capillary length.

[0012] The capillary is provided with a flared bell mouth at one end of the through hole; the unmetallized bare fiber is dipped in UV glue and inserted into the capillary from one end of the bell mouth until the end of the metallized optical fiber is inserted into the bell mouth of the capillary, and then the metallized optical fiber and the capillary are filled with UV glue at the bell mouth position and cured and fixed.

[0013] The plurality of the optical fiber fixing block assemblies after axis fixing are installed on the polishing fixture, including: fixing the capillary tube and fixing the tails of the plurality of optical fibers in one direction.

[0014] The distance between the end of the nickel tube and the tail end of the capillary is 4 mm±0.1 mm.

[0015] A metallized optical fiber fixing block assembly is obtained according to any of the above-mentioned methods of first metallizing and then polishing a metallized optical fiber fixing block assembly, comprising an optical fiber, a capillary and a nickel tube, one end of the optical fiber is a bare fiber with the optical fiber coating stripped off, the part of the bare fiber close to the optical fiber coating is the metallized optical fiber, and the end of the bare fiber away from the optical fiber coating is an unmetallized bare fiber; the unmetallized bare fiber is inserted into the through hole of the capillary, and the end of the metallized optical fiber is fixed to the capillary, and the nickel tube is welded to the outside of the metallized optical fiber.

[0016] The capillary is provided with a bell mouth in an expanded shape at one end of the through hole, and the end of the metallized optical fiber is fixed at the position of the bell mouth of the capillary.

[0017] Compared with the existing process of first fixing the axis, then metallizing, and finally welding the nickel tube, the present invention has the following advantages:

[0018] (1) By adopting the metallization-first-and-then-polishing process designed by the present invention, the distance between the capillary and the nickel tube can be shortened to a smaller extent, and the minimum distance can be controlled within 4 mm.

[0019] (2) After adopting the process method of first metallizing and then grinding and polishing designed by the present invention, the cleanliness of the rear end surface after grinding and polishing can be guaranteed, and the coupling bonding strength can be guaranteed.

[0020] (3) By adopting the process method of first metallizing and then polishing designed in the present invention, the optical fiber between the capillary and the nickel tube can be metallized. If the axis is fixed first and then metallized, it cannot be guaranteed that the exposed part of the optical fiber is a high-quality metallized optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the optical fiber fixing block assembly designed by the present invention;

[0022] Figure 2 It is a structural diagram after metallization in the present invention;

[0023] Figure 3 This is a structural diagram after the axis is fixed in the present invention;

[0024] Figure 4 It is a structural diagram after grinding and polishing in the present invention;

[0025] Figure 5 It is a structural diagram of the nickel tube in the present invention.

[0026] Description of reference numerals: 1, optical fiber; 11, metallized optical fiber; 12, unmetallized bare fiber;

[0027] 2. Capillary; 21. Bell mouth;

[0028] 3. Nickel tube. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The present application embodiment discloses a method for first metalizing and then polishing a metallized optical fiber fixing block assembly, comprising the following steps:

[0031] S1. Bare fiber metallization at the optical fiber head

[0032] Take an optical fiber 1 with a length of 1.8 m, remove the fiber coating of 20 mm at the head, clean the head, and obtain a bare fiber. Metallize the 8 mm length of the bare fiber close to the fiber coating to obtain a metallized fiber 11. The end of the bare fiber away from the fiber coating is a non-metallized bare fiber 12. Figure 1 and Figure 2 shown.

[0033] The optical fiber length is 1.8m, the metalized length is guaranteed to be 8mm±0.1cm, and the length of the unmetallized bare fiber is guaranteed to be greater than 10mm.

[0034] S2, single-mode optical fiber fixed axis

[0035] The capillary tube 2 is provided with a through hole for the unmetallized bare fiber to pass through, and a bell mouth 21 in a flared shape is provided at one end of the through hole;

[0036] After the bare fiber is metallized, dip the unmetallized bare fiber in UV glue and insert it into the capillary from one end of the bell mouth until the end of the metallized optical fiber is inserted into the bell mouth of the capillary. Then, add UV glue and fix the metallized optical fiber and the capillary at the bell mouth with UV glue. After adding glue, cure with an exposure lamp. Cut off the unmetallized bare fiber extending from the other end of the capillary. Obtain the optical fiber fixing block assembly after axis fixing as shown in 3.

[0037] The end of the metallized optical fiber should be inserted into the flare of the capillary to improve component reliability, and the UV glue fills the entire capillary to ensure the adhesion of the optical fiber.

[0038] S3, optical fiber fixing block assembly installation

[0039] Install the optical fiber fixing block assembly after axis fixing onto the polishing fixture, and install 24 pieces in sequence. This polishing fixture is an octave-angle polishing fixture. After fixing the capillary, fix the optical fiber tail in one direction on the polishing fixture to ensure that the metallized component will not break.

[0040] Specifically, the optical fiber fixing block assembly after axis fixing is installed on the grinding and polishing fixture. The hole size of the grinding and polishing fixture should be controlled to ensure the verticality of the capillary after installation, and the pigtail storage position should be designed to ensure the bare fiber yield at the metallized part.

[0041] S4, end surface grinding and polishing of optical fiber fixing block assembly

[0042] Finally, the end face of the capillary is ground and polished, and the grinding and polishing parameters are controlled to ensure the yield.

[0043] S5. Nickel tube welding after grinding and polishing

[0044] After grinding and polishing, the metallized area of ​​the optical fiber fixing block assembly that has passed the appearance inspection is welded to the nickel tube, and the distance between the end of the nickel tube 3 and the tail end of the capillary is guaranteed to be controlled within 4 mm ± 0.1 mm.

[0045] The existing three-in-one device optical fiber has a bare fiber portion between the capillary and the nickel tube, which is affected by moisture during use, affecting its reliability and possibly causing failure. However, through the method of the present application, the obtained three-in-one device optical fiber has a metallized portion between the capillary and the nickel tube, which is less affected by moisture and has high reliability.

[0046] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0047] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A method for first metalizing and then polishing a metalized optical fiber fixing block assembly, characterized in that: include: The fiber coating layer is stripped off the head of one end of the optical fiber (1) to obtain a bare fiber, and a section of the bare fiber close to the fiber coating layer is metallized to obtain a metallized optical fiber (2), and the end of the bare fiber away from the fiber coating layer is an unmetallized bare fiber (3); the capillary (2) is provided with a through hole for the unmetallized bare fiber (3) to pass through, and the unmetallized bare fiber (3) is passed through the capillary (2) until the end of the metallized optical fiber (2) is passed through the capillary (2), and the metallized optical fiber (2) and the capillary (2) are fixed at the flare (21) position by UV to obtain an optical fiber fixing block assembly after axis fixing; the optical fiber fixing block assembly after axis fixing is installed on a grinding and polishing fixture, and finally the end face of the capillary (2) is ground and polished to obtain a polished part; A nickel tube (3) is welded to the outside of the metallized optical fiber (2) of the polished component.

2. The method for first metalizing and then polishing a metalized optical fiber fixing block assembly according to claim 1, characterized in that: The length of the metallized optical fiber (2) is 8 mm±0.1 cm.

3. The method for first metalizing and then polishing a metalized optical fiber fixing block assembly according to claim 1, characterized in that: The length of the unmetallized bare fiber (3) is greater than the length of the capillary tube (2).

4. The method for first metalizing and then polishing a metalized optical fiber fixing block assembly according to claim 1, characterized in that: The capillary (2) is provided with a bell mouth (21) in an expanded shape at one end of the through hole; the unmetallized bare fiber (3) is dipped in UV glue and inserted into the capillary (2) from one end of the bell mouth (21) until the end of the metallized optical fiber (2) is inserted into the bell mouth (21) of the capillary (2), and then the metallized optical fiber (2) and the capillary (2) are filled with UV glue at the position of the bell mouth (21) and cured and fixed.

5. The method for first metalizing and then polishing a metalized optical fiber fixing block assembly according to claim 1, characterized in that: The plurality of optical fiber fixing block assemblies after axis fixing are mounted on a polishing fixture, including: fixing a capillary tube (2) and fixing the tails of the plurality of optical fibers in one direction.

6. A metallized optical fiber fixing block assembly, characterized in that: A metallized optical fiber fixing block assembly is obtained by the method of first metallizing and then polishing according to any one of claims 1 to 5, comprising an optical fiber, a capillary (2) and a nickel tube (3), one end of the optical fiber is a bare fiber with the optical fiber coating stripped off, the portion of the bare fiber close to the optical fiber coating is the metallized optical fiber (2), and the end of the bare fiber away from the optical fiber coating is the unmetallized bare fiber (3); the unmetallized bare fiber (3) is inserted into the through hole of the capillary (2), and the end of the metallized optical fiber (2) is fixed to the capillary (2), and the nickel tube (3) is welded to the outside of the metallized optical fiber (2).

7. The metallized optical fiber fixing block assembly according to claim 6, characterized in that: The capillary tube (2) is provided with a bell mouth (21) in an expanded shape at one end of the through hole, and the end of the metallized optical fiber (2) is fixed in position with the bell mouth (21) of the capillary tube (2).

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