CN113296192B - Manufacturing method of transmission low-loss thin film filter - Google Patents

Manufacturing method of transmission low-loss thin film filter Download PDF

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Publication number
CN113296192B
CN113296192B CN202110515450.4A CN202110515450A CN113296192B CN 113296192 B CN113296192 B CN 113296192B CN 202110515450 A CN202110515450 A CN 202110515450A CN 113296192 B CN113296192 B CN 113296192B
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lens
glass tube
hole capillary
tube
capillary tube
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CN113296192A (en
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刘光清
耿玲
王雨祥
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Nanjing Huamai Technology Co Ltd
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Nanjing Huamai Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The invention discloses a manufacturing method of a transmission low-loss thin film filter, which comprises the following steps of 1, assembling the thin film filter and a first lens; step 2, assembling a first lens, a second lens and a first glass tube, wherein one end of the first lens, which is fixed with a thin film filter, and one end of the second lens extend into the first glass tube from two ends of the first glass tube respectively; step 3, respectively placing the double-hole capillary tube and the single-hole capillary tube provided with the optical fiber on two sides of the first glass tube, and respectively coupling the double-hole capillary tube and the single-hole capillary tube with the first lens and the second lens; and 4, sleeving a second glass tube at one end of the first lens opposite to the double-hole capillary tube, and sleeving a third glass tube at one end of the second lens opposite to the single-hole capillary tube. The second glass tube and the third glass tube are matched and adjusted together, the optimal transmission insertion loss is obtained by finely adjusting the insertion angle, the one-time yield is high, the insertion loss is small, and the cost is lower.

Description

Manufacturing method of transmission low-loss thin film filter
Technical Field
The invention relates to a manufacturing method of a transmission low-loss thin film filter, belonging to the technical field of optical passive wavelength division devices.
Background
The deployment of 5G will drive the global flow to increase fast, and the continuous improvement of optical communication technique brings new considerable demand to thin film filter syllogic device, and low cost, low loss also will decide whether the product possesses market competition simultaneously.
At present, a conventional three-stage device of a thin film filter, as disclosed in patent document 1, is configured such that a double-line collimator is first fabricated, then a single-line collimator is fabricated, and then the double-line collimator and the single-line collimator are coupled together. The conventional process has the problems that the incident light path is fixed, the transmission is influenced by the incident angle and the insertion loss is large, so that the yield of a primary finished product is low, the debugging times are more, and the production efficiency is low.
Patent document 1: the application publication number is the Chinese patent application publication document CN 105974524A.
Disclosure of Invention
The invention aims to provide a manufacturing method of a transmission low-loss thin-film filter, which solves the technical defects of large insertion loss of the filter and low yield of finished products in the prior art because a double-line collimator and a single-line collimator are manufactured independently and simultaneously.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the manufacturing method of the transmission low-loss thin film filter comprises the following steps:
step 1, assembling the thin film filter and the first lens, and fixing the thin film filter on the end face of one end of the first lens.
Step 2, assembling the first lens, the second lens and the first glass tube, wherein one end of the first lens, which is fixed with the thin film filter, and one end of the second lens extend into the first glass tube from two ends of the first glass tube respectively, the first lens and the second lens are fixed with the first glass tube, and the ends, which are far away from each other, of the first lens and the second lens are located outside the first glass tube.
And 3, respectively placing the double-hole capillary tube and the single-hole capillary tube which are provided with the optical fibers on two sides of the first glass tube, and respectively coupling the double-hole capillary tube and the single-hole capillary tube with the first lens and the second lens.
And 4, sleeving and fixing a second glass tube at one end of the first lens opposite to the double-hole capillary tube, and sleeving and fixing a third glass tube at one end of the second lens opposite to the single-hole capillary tube.
The second glass tube and the third glass tube are matched and adjusted together, the debugging times are few, and the production efficiency of the transmission low-loss thin film filter is improved.
As a further improvement of the invention, the surfaces of the two sides of the thin film filter are respectively plated with a main film and an antireflection film, and the surface of the thin film filter plated with the main film is fixed with the end face of the first lens in the step 1. The main film and the antireflection film are plated on the surface of the thin film filter, so that the light transmission is enhanced, and the light loss is further reduced.
As a further improvement of the present invention, step 3 and step 4 are performed on an adjusting frame, and the first glass tube, the dual-hole capillary tube and the single-hole capillary tube are respectively fixed on a first clamp, a second clamp and a third clamp of the adjusting frame, so that the center lines of the first glass tube, the dual-hole capillary tube and the single-hole capillary tube are located on the same horizontal line, wherein the second clamp and the third clamp can move towards or away from the first clamp to adjust the distance between the dual-hole capillary tube and the single-hole capillary tube and the first glass tube, step 4 is performed by moving the second clamp and the third clamp towards the direction away from the first clamp to increase the distance between the dual-hole capillary tube and the single-hole capillary tube and the first glass tube, leaving a space for sleeving the second glass tube and the third glass tube, sleeving one end of the second glass tube on one end of the dual-hole capillary tube facing the first lens or one end of the first lens extending out of the first glass tube, moving the first clamp towards the direction of the first glass tube to respectively sleeve two ends of the second glass tube and the first glass tube on the first glass tube, and moving one end of the third glass tube towards the first glass tube respectively to sleeve one end of the first glass tube.
As a further improvement of the invention, one end of the second glass tube, which is opposite to the third glass tube, is respectively connected with two ends of the first glass tube.
As a further improvement of the invention, the first lens is a self-focusing lens, one end of the first lens, which is used for fixing the thin film filter, is a plane, the end face of the first lens, which is used for being coupled with the double-hole capillary tube, is an 8-degree face, and antireflection films are plated on the two end faces of the first lens. The 8-degree surface of the invention can improve the return loss of the product and reduce the influence of reflected light on the transmission performance of the system, and the first lens is coated with the antireflection film to increase the light transmittance of laser and reduce attenuation, so that the transmission performance is better.
As a further improvement of the invention, the end surface of the end of the double-hole capillary close to the first lens is an 8-degree surface, and the end surface of the end of the double-hole capillary opposite to the first lens is parallel to the end surface. The 8-degree surface of the double-hole capillary tube is used for improving return loss.
As a further improvement of the invention, the second lens is a spherical lens, the end face of the second lens far away from one end of the first lens is an 8-degree face, so that the return loss is improved, and antireflection films are plated on the spherical face and the 8-degree face of the second lens, so that the light transmittance of laser is increased, and the attenuation is reduced.
As a further improvement of the invention, the end face of the single-hole capillary close to the second lens is an 8-degree face, which has the beneficial effect that the return loss is also improved, and the end face of the end of the single-hole capillary opposite to the second lens is parallel.
As a further improvement of the invention, the lowest points of the first lens and the second lens are located on the same horizontal plane.
As a further improvement of the present invention, in step 3, the double-hole capillary and the single-hole capillary are adjusted, and the loss value is monitored to the minimum by using an optical power meter.
In conclusion, the beneficial effects of the invention are as follows: the second glass tube and the third glass tube are matched and adjusted together, the optimal transmission insertion loss is obtained by finely adjusting the incidence angle, the optical fiber filter is relatively simple and insensitive to wavelength, can work in the full wave band of 1260nm to 1620nm and in the temperature range of minus 40 ℃ to 85 ℃, the transmission insertion loss is better than that of a three-section device of a thin film filter manufactured by a traditional method, the one-time yield is high, the insertion loss is smaller, the debugging times are reduced, the working procedure is shortened, the production efficiency is high, the labor cost is reduced, and therefore the optical fiber filter is lower in total cost.
Drawings
FIG. 1 is a schematic diagram of an assembly of a first lens element and a thin film filter according to the present invention.
FIG. 2 is a schematic view of the assembly of the first lens, the second lens and the first glass tube according to the present invention.
Fig. 3 is a schematic structural diagram of a transmission low-loss thin film filter according to the present invention.
FIG. 4 is a schematic of a dual-hole capillary tube of the present invention.
FIG. 5 is a schematic end view of a dual-bore capillary tube according to the present invention.
FIG. 6 is a schematic view of a single-hole capillary tube according to the present invention.
FIG. 7 is a schematic end view of a single-hole capillary tube according to the present invention.
Wherein: 1. a thin film filter; 2. a first lens; 3. a first glass tube; 4. a second lens; 5. a double-hole capillary tube; 6. a single-hole capillary tube; 7. a second glass tube; 8. a third glass tube; 9. an optical fiber.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention takes a first lens 2 with the outer diameter of 1.8mm, a double-hole capillary 5 with the outer diameter of 1.8mm, a second lens 4 with the outer diameter of 1.8mm, a single-hole capillary 6 with the outer diameter of 1.8mm, a first glass tube 3 with the outer diameter of 2.78mm and the inner diameter of 1.81mm, a second glass tube 7 with the outer diameter of 2.78mm and the inner diameter of 1.8mm, and a third glass tube 8 with the outer diameter of 2.78mm and the inner diameter of 1.8mm as examples to explain the manufacturing method of the transmission low-loss thin film filter, and the invention comprises the following steps:
step 1, assembling a thin film filter 1 and a first lens 2, and fixing the thin film filter 1 on the end face of one end of the first lens 2; the invention discloses a method for fixing a thin film filter 1 on an end face of a first lens 2, wherein the two side surfaces of the thin film filter 1 are respectively plated with a main film and an anti-reflection film, the surface of the thin film filter 1 plated with the main film is fixed with the end face of the first lens 2, the main film is a film with scattering or transmission function which is plated according to the requirements of customers, the first lens 2 is a self-focusing lens, the end face of one end of the first lens 2 used for fixing the thin film filter 1 is a plane, the end face of the other end of the first lens 2 is an 8-degree face, the surfaces of the first lens 2 used for fixing the thin film filter 1 and the 8-degree faces are both plated with the anti-reflection films, the 8-degree face of the first lens 2 in the invention means that the included angle between the end face of one end of the first lens 2 and the central line of the first lens 2 is 8 degrees, the method adopts glue to fix the thin film filter 1 on the end face of the first lens 2, and has the following specific operations: dispensing glue on the end face of the first lens 2, pressing the thin film filter 1 on the end face of the first lens 2, and ensuring that the center lines of the thin film filter 1 and the first lens 2 are collinear.
Step 2, assemble first lens 2, second lens 4 and first glass pipe 3, stretch into first glass pipe 3 from the one end of first glass pipe 3 with the one end that first lens 2 in step 1 is fixed with thin film filter 1 in, stretch into first glass pipe 3 with the other end of first glass pipe 3 with the one end of second lens 4 in, and adjust the distance between the one end that thin film filter 1 and second lens 4 are located first glass pipe 3, fix first lens 2 and second lens 4 and first glass pipe 3 mutually again, wherein: one ends of the first lens 2 and the second lens 4, which are far away from each other, are positioned outside the first glass tube 3; the second lens 4 is a spherical lens, the end face of the second lens 4 at one end in the first glass tube 3 is a spherical surface, the end face of the second lens 4 at one end far away from the first lens 2 is an 8-degree face, namely, the included angle between the end face of the second lens 4 at one end outside the first glass tube 3 and the central line of the second lens 4 is 8 degrees, and antireflection films are plated on the spherical surface and the 8-degree face of the second lens 4; after the first lens 2, the second lens 4 and the first glass tube 3 are assembled, the lowest points of the first lens 2 and the second lens 4 are positioned on the same horizontal plane.
Step 3, respectively placing the double-hole capillary 5 and the single-hole capillary 6 provided with the optical fiber 9 on two sides of the first glass tube 3, and respectively coupling the double-hole capillary 5 and the single-hole capillary 6 with the first lens 2 and the second lens 4; the end face of the double-hole capillary 5 close to one end of the first lens 2 is an 8-degree face, namely, the included angle between the end face of the double-hole capillary 5 and the center line thereof is 8 degrees, the angle of the double-hole capillary 5 is adjusted until the loss value monitored by an optical power meter is minimized, the 8-degree face of the double-hole capillary 5 is parallel to the 8-degree face of the first lens 2, the end face of the single-hole capillary 6 close to one end of the second lens 4 is an 8-degree face, namely, the included angle between the end face of the single-hole capillary 6 and the center line thereof is 8 degrees, the angle of the single-hole capillary 6 is adjusted until the loss value monitored by the optical power meter is minimized, and the 8-degree face of the single-hole capillary 6 is parallel to the 8-degree face of the second lens 4. Two through holes are formed in the double-hole capillary 5 along the length direction of the double-hole capillary and used for inserting two optical fibers 9, a through hole is formed in the single-hole capillary 5 along the length direction of the single-hole capillary and used for inserting one optical fiber 9, and the 8-degree surface of the double-hole capillary 5, the 8-degree surface of the first lens 2, the 8-degree surface of the second lens 4 and the 8-degree surface of the single-hole capillary 6 are parallel to each other.
Step 4, sleeving and fixing a second glass tube 7 on one end of the first lens 2 opposite to the double-hole capillary 5, and sleeving and fixing a third glass tube 8 on one end of the second lens 4 opposite to the single-hole capillary 6; after the assembly is completed, one ends of the second glass tube 7 and the third glass tube 8, which are opposite to each other, are respectively connected with two ends of the first glass tube 3, the double-hole capillary tube 5 and the first lens 2 are fixed with the second glass tube 7 in a dispensing manner, and the single-hole capillary tube 6, the second lens 4 and the third glass tube 8 are fixed with the dispensing manner, wherein the dispensing and fixing per se is the prior art.
In the present invention, steps 3 and 4 are performed on an adjusting frame (not shown in the figure), wherein the adjusting frame is provided with a first clamp, a second clamp and a third clamp, wherein the first clamp is fixed on the adjusting frame, the second clamp and the third clamp are positioned at two sides of the first clamp and form a horizontal moving pair with the adjusting frame, the second clamp and the third clamp can move towards or away from the first clamp to adjust the distance between the second clamp and the third clamp and the first clamp, the structure for moving the second clamp and the third clamp on the adjusting frame is the prior art, such as a way of matching a slide rail and a slide block, etc., the present invention does not give details, the first glass tube 3, the double-hole capillary tube 5 and the single-hole capillary tube 6 are respectively fixed on the first clamp, the second clamp and the third clamp, and ensure that the central lines of the first clamp and the second clamp and the third clamp are positioned on the same horizontal line, the distance between the double-hole capillary tube 5 and the single-hole capillary tube 6 and the first glass tube 3 is adjusted by adjusting the distance between the second clamp and the third clamp and the first clamp, the single-hole capillary tube 5 is sleeved on the first glass tube 3, the second clamp and the second glass tube 2, the capillary tube 4 is sleeved on the first glass tube 3, the capillary tube 2, the capillary tube is moved towards the first clamp, the second clamp and the second glass tube 2, the second glass tube 8, the capillary tube is sleeved by adjusting the capillary tube 4, and the capillary tube 4, the capillary tube 3, and the capillary tube is moved towards the capillary tube 2, and the capillary tube 2, and then the second clamp moves towards the first glass tube 3, so that two ends of the third glass tube 8 are respectively sleeved on the single-hole capillary tube 6 and the second lens 4. Preferably, one end of a second glass tube 7 is sleeved on one end of a double-hole capillary tube 5 close to a first lens 2, then the second clamp is moved towards the direction of the first clamp, so that the other end of the second glass tube 7 is sleeved on one end of an 8-degree surface of the first lens 2, and the second glass tube 7, the double-hole capillary tube 5 and the first lens 2 are fixed.
Parts which are not specifically described in the above description are prior art or can be realized by the prior art. The specific embodiments of the present invention are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the contents of the claims of the present invention should be regarded as the technical scope of the present invention.

Claims (7)

1. The manufacturing method of the transmission low-loss thin film filter is characterized by comprising the following steps of: comprises the following steps of (a) preparing a solution,
step 1, assembling a thin film filter (1) and a first lens (2), fixing the thin film filter (1) on the end face of one end of the first lens (2), wherein a main film and an antireflection film are respectively plated on the surfaces of two sides of the thin film filter (1), and the surface of the thin film filter (1) plated with the main film is fixed with the end face of the first lens (2);
step 2, assembling a first lens (2), a second lens (4) and a first glass tube (3), respectively extending one end of the first lens (2) fixed with a thin film filter (1) and one end of the second lens (4) into the first glass tube (3) from two ends of the first glass tube (3) and fixing the first lens (2) and the second lens (4) with the first glass tube (3), wherein the ends of the first lens (2) and the second lens (4) far away from each other are positioned outside the first glass tube (3), and the lowest points of the first lens (2) and the second lens (4) are positioned on the same horizontal plane;
step 3, respectively placing a double-hole capillary tube (5) provided with an optical fiber (9) and a single-hole capillary tube (6) on two sides of the first glass tube (3), and respectively coupling the double-hole capillary tube (5) and the single-hole capillary tube (6) with the first lens (2) and the second lens (4);
step 4, sleeving and fixing a second glass tube (7) at one opposite end of the first lens (2) and the double-hole capillary tube (5), and sleeving and fixing a third glass tube (8) at one opposite end of the second lens (4) and the single-hole capillary tube (6);
wherein: step 3 and step 4 are completed on an adjusting frame, the first glass tube (3), the double-hole capillary tube (5) and the single-hole capillary tube (6) are respectively fixed on a first clamp, a second clamp and a third clamp of the adjusting frame, the central lines of the first glass tube, the second clamp and the third clamp are positioned on the same horizontal line, the second clamp and the third clamp can move towards or away from the first clamp to adjust the distance between the double-hole capillary tube (5) and the single-hole capillary tube (6) and the first glass tube (3), in step 4, the distance between the double-hole capillary tube (5) and the single-hole capillary tube (6) and the first glass tube (3) is increased by moving the second clamp and the third clamp towards the direction away from the first clamp, reserving a space for sleeving a second glass tube (7) and a third glass tube (8), sleeving one end of the second glass tube (7) on one end of the double-hole capillary tube (5) facing the first lens (2) or one end of the first lens (2) extending out of the first glass tube (3), moving the first clamp towards the first glass tube (3) to ensure that two ends of the second glass tube (7) are respectively sleeved on the double-hole capillary tube (5) and the first lens (2), sleeving one end of the third glass tube (8) on one end of the single-hole capillary tube (6) facing the second lens (4) or one end of the second lens (4) extending out of the first glass tube (3), and moving the second clamp towards the first glass tube (3) to ensure that the third glass tube (8) The two ends of the lens are respectively sleeved on the single-hole capillary tube (6) and the second lens (4).
2. The method of manufacturing a transmission low-loss thin film filter according to claim 1, wherein: one end of the second glass tube (7) opposite to one end of the third glass tube (8) is respectively connected with two ends of the first glass tube (3).
3. The method of manufacturing a transmission low-loss thin film filter according to claim 2, wherein: the first lens (2) is a self-focusing lens, one end, used for fixing the thin film filter (1), of the first lens (2) is a plane, the end face, used for being coupled with the double-hole capillary tube (5), of the first lens (2) is an 8-degree face, and antireflection films are plated on the two end faces of the first lens (2).
4. The method of claim 3, wherein the method comprises: the end face of one end, close to the first lens (2), of the double-hole capillary tube (5) is an 8-degree face, and the end face of the opposite end of the double-hole capillary tube (5) and the first lens (2) is parallel.
5. The method of manufacturing a transmission low-loss thin film filter according to claim 1, wherein: the second lens (4) is a spherical lens, the end face of one end, away from the first lens (2), of the second lens (4) is an 8-degree face, and antireflection films are plated on the spherical face and the 8-degree face of the second lens (4).
6. The method of manufacturing a transmission low-loss thin film filter according to claim 5, wherein: the end face of one end, close to the second lens (4), of the single-hole capillary tube (6) is an 8-degree face, and the end face of the end, opposite to the second lens (4), of the single-hole capillary tube (6) is parallel to the end face of the end, opposite to the second lens (4).
7. The method of manufacturing a transmission low-loss thin film filter according to claim 1, wherein: in step 3, the double-hole capillary (5) and the single-hole capillary (6) are adjusted, and an optical power meter is adopted to monitor the loss value to be minimum.
CN202110515450.4A 2021-05-12 2021-05-12 Manufacturing method of transmission low-loss thin film filter Active CN113296192B (en)

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Publication number Priority date Publication date Assignee Title
JP5125467B2 (en) * 2007-12-11 2013-01-23 日本電気硝子株式会社 Optical device
CN105974524A (en) * 2016-07-29 2016-09-28 四川天邑康和通信股份有限公司 Making method of wavelength division multiplexer
CN211826608U (en) * 2020-05-08 2020-10-30 南京华脉科技股份有限公司 Film filter piece type non-uniform splitting optical splitter
CN212586588U (en) * 2020-07-14 2021-02-23 福州百讯光电有限公司 Small-sized wavelength division multiplexing device

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