Device for coupling optical fiber and optical fiber collimator

Abstract

The invention discloses a device for coupling an optical fiber and an optical fiber collimator, and the device comprises a shockproof platform which is provided with two multi-axis mobile positioning platforms, one multi-axis mobile positioning platform is provided with an optical fiber fixing clamp, and the other multi-axis mobile positioning platform is provided with a collimator fixing clamp. The shockproof platform is further provided with a CDD image recognition control system used for achieving alignment coupling of the optical fiber located in the optical fiber fixing clamp and the optical fiber collimator located in the collimator fixing clamp. According to the invention, the coupling efficiency of the optical fiber and the optical fiber collimator is effectively improved, the alignment difficulty of the optical fiber and the optical fiber collimator is reduced, and the coupling stability of the optical fiber and the optical fiber collimator is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of optical modules, and in particular relates to a device for coupling an optical fiber and an optical fiber collimator. Background Art

[0002] With the rapid development of optical communication technology, the communication industry has continuously improved its performance requirements for optical fiber communication. When traditional optical fibers are transmitted in silica media, there are problems such as large optical fiber loss and limited transmission rate. To solve these problems, optical fiber technology came into being. This technology uses a specific optical fiber structure to replace the traditional silica fiber core with air. Since light has a higher transmission rate and lower loss in air, optical fiber has shown broad development prospects in the field of optical transmission with its unique structure and performance.

[0003] In the optical fiber system, the optical fiber collimator transforms the input light spot into a Gaussian beam to increase the beam waist of the light spot, thereby increasing the working distance of the laser beam. When the optical fiber is coupled with the optical fiber collimator, the advantages of low loss and high speed of the optical fiber can be fully utilized, so that the overall system has better optical transmission performance.

[0004] However, the existing optical fiber and optical fiber collimator coupling methods have many problems, such as low coupling efficiency, low alignment accuracy, poor stability, etc. These problems seriously restrict the performance and reliability of the optical fiber system. Therefore, it is urgent to develop a device for coupling hollow core anti-resonant fiber and optical fiber collimator to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a device for coupling optical fiber and optical fiber collimator in view of the technical defects existing in the prior art, which effectively improves the coupling efficiency of optical fiber and optical fiber collimator, reduces the alignment difficulty of optical fiber and optical fiber collimator, and enhances the stability of coupling between optical fiber and optical fiber collimator.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the present invention discloses a device for coupling optical fiber and optical fiber collimator, including a shockproof platform, on which two multi-axis mobile positioning platforms are arranged, one multi-axis mobile positioning platform is provided with an optical fiber fixing fixture, and the other multi-axis mobile positioning platform is provided with a collimator fixing fixture, and the shockproof platform is also provided with a CDD image recognition control system for realizing the alignment coupling of the optical fiber located in the optical fiber fixing fixture and the optical fiber collimator located in the collimator fixing fixture.

[0007] In a preferred embodiment of the present invention, the anti-vibration platform is provided with a shock absorbing spring and a threaded hole for connecting to the multi-axis mobile positioning platform.

[0008] In a preferred embodiment of the present invention, the multi-axis mobile positioning platform includes at least one first linear module extending along the X-axis direction, the mobile end of the first linear module is connected to at least one second linear module extending along the Y-axis direction, the mobile end of the first linear module is connected to at least one third linear module extending along the Z-axis direction, and the mobile end of the third linear module is connected to a fixture fixing platform.

[0009] In a preferred embodiment of the present invention, the first linear module, the second linear module and the third linear module are a mobile control platform, and the mobile control platform includes a knob control unit for realizing position adjustment in the Y-axis direction by rotation operation; a platform fixed base, and the knob control unit is fixed on the base; a spring guide ejector pin connected to the knob control unit and capable of reciprocating along the Y-axis direction; a precision compression spring located between the spring guide ejector pin and the upper mobile platform; and the upper mobile platform contacts the spring guide ejector pin and moves therewith.

[0010] In a preferred embodiment of the present invention, the knob control unit includes a knob control unit fixing base, a knob control platform fixing hole and a knob, the knob is axially limited and installed in the knob control platform fixing hole, and the knob can rotate around its own axis; a main body plate is provided on the platform fixing base, and a knob control unit fixing threaded hole, a dovetail control platform, and a spring guide ejector fixing thread are provided on the main body plate, and a main body guide ejector is fixedly connected in the spring guide ejector fixing thread; the spring guide ejector includes a main body guide ejector, an external thread and a spring, and the external thread cooperates with the spring guide ejector fixing threaded hole to fix the spring guide ejector; the upper movable platform includes a main body, a dovetail protrusion groove and a guide ejector guide structure, and the spring is located between the guide ejector guide structure and the spring guide ejector fixing thread; the knob control unit is fixed on the platform fixing base, and when the knob is rotated, the ejector thereon will move outward or inward.

[0011] In a preferred embodiment of the present invention, the multi-axis mobile positioning platform may also include at least one first rotating module rotating around the X-axis and / or at least one first rotating module rotating around the Y-axis and / or at least one first rotating module rotating around the Z-axis.

[0012] In a preferred embodiment of the present invention, the optical fiber fixing fixture includes a base plate fixing fixture and a clamping cover plate, the base plate fixing fixture is provided with a hole for connecting the multi-axis mobile positioning platform, a hole axis for connecting the clamping cover plate, an optical fiber fixing groove for fixing the optical fiber and a first permanent magnet for fixing and connecting the clamping cover plate, the clamping cover plate is provided with a second permanent magnet, and the arrangement positions of the first permanent magnet and the second permanent magnet correspond to each other.

[0013] In a preferred embodiment of the present invention, the collimator fixing fixture includes a base plate and a cover plate, the base plate is provided with a hole for connecting the multi-axis mobile positioning platform, a hole axis for connecting the cover plate, a collimator fixing groove for fixing the optical fiber collimator and a third permanent magnet, the cover plate is provided with a fourth permanent magnet, and the arrangement positions of the third permanent magnet and the fourth permanent magnet correspond to each other.

[0014] In a preferred embodiment of the present invention, the CDD image recognition control system includes a position adjustment unit and an imaging unit connected to a displacement end of the position adjustment component.

[0015] In a preferred embodiment of the present invention, the position adjustment unit includes a vertical movable platform extending along the Z axis, the vertical movable platform is connected to a horizontal movable platform extending along the X axis, the horizontal movable platform is connected to a rotating platform rotatable around the Y axis, and the rotating platform is connected to the imaging unit.

[0016] In a preferred embodiment of the present invention, the imaging unit comprises a CDD, a CDD image feedback processing system and a UV light illumination system.

[0017] In a preferred embodiment of the present invention, two rotating platforms rotatable around the Y-axis are connected to the horizontal moving platform, and each rotating platform is connected to an imaging unit.

[0018] The present invention also discloses a method for coupling an optical fiber and an optical fiber collimator based on a device, wherein the optical fiber collimator is a gradient refractive index lens, and the refractive index distribution of the gradient refractive index lens satisfies the following in, is the refractive index at a distance r from the optical axis, is the central refractive index, is the refractive index gradient constant; the inner core diameter of the optical fiber is , the cladding thickness is , the refractive index of the inner core is The refractive index of the cladding is , the following conditions are met: ; Align the fiber collimator with the optical fiber so that the output optical axis of the fiber collimator coincides with the central axis of the optical fiber, and the alignment error is less than ,in ; Use UV curing glue to fix the optical fiber and the optical fiber collimator. The curing time is , the curing temperature is , the following conditions are met: , .

[0019] In a preferred embodiment of the present invention, the coupling efficiency is greater than η at a light signal with a wavelength of λ, wherein ; Insertion loss is less than ,in ; Return loss is greater than ,in ; In the temperature range The coupling performance is stable, among which , .

[0020] The beneficial effects of the present invention are as follows: the present invention discloses a device for coupling optical fiber and optical fiber collimator, which solves the technical problems of poor stability, low precision, low efficiency and the like existing in the coupling process of traditional optical fiber and collimator, promotes the technological progress in the field of optical fiber communication, and has important practical value.

[0021] First, the present invention can effectively offset the impact of desktop shaking by setting up a shockproof platform and a shock-absorbing spring structure, significantly improving the stability of the entire platform and creating a good basic condition for the precise alignment of the optical fiber and the collimator. The left and right three-axis mobile positioning platform adopts a precise mechanical control structure, combined with a spring-guided ejector and knob control system, to achieve high-precision position adjustment of the optical fiber and the collimator in three-dimensional space, greatly improving the accuracy of coupling alignment.

[0022] Secondly, the fixture design of the present invention is unique, adopting a V-groove structure with a base plate and a cover plate, and innovatively using a permanent magnet adsorption fixation method, which not only ensures the stable installation of the optical fiber and collimator, but also facilitates operation and significantly improves assembly efficiency. The introduction of the CDD image recognition control system makes the coupling process more intelligent through real-time monitoring and automatic control, greatly reducing the difficulty and error rate of manual operation.

[0023] Thirdly, the device is reasonably designed, compact in structure, and the functional components work together to build a complete automatic coupling system. Through the cooperation of the UV light illumination system, the automatic control of coupling dispensing and curing is realized, which not only improves the stability and reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 A schematic diagram of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 2 A schematic diagram of the installation position of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 3 A schematic diagram of a shockproof platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 4 Schematic diagram of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 5 An exploded view of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 6 A schematic diagram of an embodiment of a linear module in a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator of the present invention; Figure 7 A schematic diagram of a lead screw driving unit of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Figure 8 A schematic diagram of the guide rails of the multi-axis mobile positioning platform of the device for coupling optical fiber and optical fiber collimator of the present invention; Fig. 9 A schematic diagram of a guide pin of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Fig.10 A schematic diagram of a slider of a multi-axis mobile positioning platform of a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Fig.11 Schematic diagram of an optical fiber fixing fixture and a collimator fixing fixture of a device for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.12 An exploded view of an optical fiber fixing fixture and a collimator fixing fixture of the device for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.13 An exploded top view of an optical fiber fixing fixture and a collimator fixing fixture of a device for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.14 An exploded view of an optical fiber fixing fixture of an apparatus for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.15 A top view of the optical fiber fixing fixture of the device for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.16 An exploded view of a collimator fixing fixture of a device for coupling an optical fiber and an optical fiber collimator of the present invention; Fig.17 Schematic diagram of a CDD image recognition control system for a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Fig.18 A schematic diagram of a vertical moving platform of a CDD image recognition control system for a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Fig.19 A schematic diagram of a switching platform of a CDD image recognition control system for a device for coupling an optical fiber and an optical fiber collimator according to the present invention; Fig. 20A rear view of the adapter platform of the CDD image recognition control system of the device for coupling optical fiber and optical fiber collimator of the present invention; Fig.21 A schematic diagram of a horizontal moving platform of a CDD image recognition control system of a device for coupling an optical fiber and an optical fiber collimator of the present invention. DETAILED DESCRIPTION In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1 like Figure 1-3 As shown, this embodiment provides a fiber coupling system based on a shockproof three-axis mobile positioning platform, which is mainly composed of a shockproof platform 1-1, a three-axis mobile positioning platform and a corresponding control mechanism. The specific implementation of this embodiment is described in detail below: First, the present invention sets a shockproof platform 1-1 at the bottom of the system. The platform is made of high-strength aluminum alloy material and has good rigidity and stability. Shock-absorbing springs 1-1-1 are installed at the four bottom corners of the shockproof platform. The compression stroke of each shock-absorbing spring can be set to 10mm, and the elastic coefficient can be selected to be 50N / mm, which can effectively absorb environmental vibrations. A plurality of threaded holes 1-1-2 are evenly distributed on the upper surface of the shockproof platform, and the spacing of the threaded holes can be set to 50mm, forming a standard grid layout, which is convenient for installing various functional modules.

[0026] A three-axis mobile positioning platform with left-right symmetry is installed on the anti-vibration platform, of which the left three-axis positioning platform 1-2 is used to control the position of the optical fiber, and the right three-axis positioning platform 1-3 is used to control the position of the collimator. Taking the right three-axis positioning platform 1-3 as an example, it includes an X-axis mobile control platform 1-3-1, a Z-axis mobile control platform 1-3-2, and a Y-axis mobile control platform 1-3-3. Each control platform adopts a precision mechanical structure design, and its working principle is explained by taking the Y-axis mobile control platform as an example: The Y-axis mobile control platform includes a knob control unit 1-3-3-1, a platform fixed base 1-3-3-2, a spring-guided ejector pin 1-3-3-3, a precision compression spring 1-3-3-4, and an upper mobile platform 1-3-3-5. The knob control unit 1-3-3-1 is connected to the platform fixed base through a thread. When the operator turns the knob, the rotational motion is converted into linear motion through the thread pair, driving the ejector pin to move along the Y-axis direction. The stroke accuracy of the spring-guided ejector pin can reach 0.01mm, ensuring the accuracy of position adjustment.

[0027] like Figure 4-10As shown, the knob control unit 1-3-3-1 includes a knob control unit fixing base 1-3-3-1-1, a knob control platform fixing hole 1-3-3-1-2 and a knob 1-3-3-1-3. The knob 1-3-3-1-3 is axially limited and installed in the knob control platform fixing hole 1-3-3-1-2. The knob 1-3-3-1-3 can rotate around its own axis. Figure 4-5 The platform fixing base 1-3-3-2 is provided with a main body plate 1-3-3-2-1, and the main body plate 1-3-3-2-1 is provided with a knob control unit fixing threaded hole 1-3-3-2-2, a dovetail control platform 1-3-3-2-3, and a spring guide ejector fixing threaded hole 1-3-3-2-4, and the spring guide ejector fixing threaded hole 1-3-3-2-4 is fixedly connected with the main body guide ejector 1-3-3-3-1; the spring guide ejector 1-3-3-3 includes the main body guide ejector 1-3-3-3-1, an external thread 1-3-3-3-2 and a spring 1-3-3-4, the external thread 1-3-3-3-2 cooperates with the spring guide ejector pin fixing threaded hole 1-3-3-2-4 to fix the spring guide ejector pin 1-3-3-3; the upper moving platform 1-3-3-5 includes a main body plate 1-3-3-5-1, a dovetail protrusion groove 1-3-3-5-2 and a guide ejector pin guiding structure 1-3-3-5-3, and the spring 1-3-3-4 is located between the guide ejector pin guiding structure 1-3-3-5-3 and the spring guide ejector pin fixing threaded hole 1-3-3-2-4. The knob control unit 1-3-3-1 is fixed on the platform fixed base 1-3-3-2. When the knob 1-3-3-1-3 is rotated, the ejector pin thereon will move outward or inward. When it moves outward, it will support the upper mobile platform 1-3-3-5, so that the mobile platform moves outward (along the Y-axis direction). At the same time, the guide ejector pin guide structure 1-3-3-5-3 on the upper mobile platform 1-3-3-5 will compress the spring 1-3-3-4. When the knob 1-3-3-1-3 is twisted in the opposite direction, the contact between the spring guide ejector pin 1-3-3-3 and the upper mobile platform 1-3-3-5 will be reduced, and the spring 1-3-3-4 will stretch. The elastic force of the spring 1-3-3-4 will push the upper mobile platform 1-3-3-5 inward, so that the mobile control platform of the upper mobile platform 1-3-3-5 returns to its position.

[0028] The upper mobile platform 1-3-3-5 adopts a dovetail groove structure design, forming a precision sliding pair with the platform fixed base. When the ejector pin is pushed outward, the upper platform moves forward along the Y axis; when the ejector pin is retracted, the platform automatically returns to its original position under the action of the compression spring. The reciprocating positioning accuracy of the entire mechanism is better than 0.02mm, which meets the accuracy requirements of optical fiber coupling.

[0029] The three-axis mobile positioning platform of this embodiment adopts a fully mechanical structure design, does not require a complex electronic control system, and has the advantages of simple structure, high reliability, and easy maintenance. At the same time, through the cooperation of the precision mechanical transmission mechanism, high-precision position adjustment of the optical fiber and the collimator in three-dimensional space is achieved, laying the foundation for subsequent precise coupling.

[0030] Embodiment 2: Automatic optical fiber coupling device based on magnetic fixing fixture This embodiment provides an optical fiber automatic coupling device based on a magnetic fixing fixture, focusing on the innovative design of the fixing fixture and the implementation scheme of the CDD image recognition control system.

[0031] like Figure 11-16 As shown, the optical fiber fixing fixture and the collimator fixing fixture have the same working principle. The optical fiber fixing fixture is used to fix the optical fiber 2-3, and the collimator fixing fixture is used to fix the optical fiber collimator 2-6. The cooperation between the optical fiber fixing fixture and the collimator fixing fixture realizes the docking of the optical fiber 2-3 and the optical fiber collimator 2-6.

[0032] The optical fiber fixing fixture is mainly composed of a bottom plate fixing fixture 2-1 and a clamping cover plate 2-2. The bottom plate fixing fixture 2-1 can be made of aviation-grade aluminum alloy material, which has good wear resistance and corrosion resistance after anodizing. A positioning hole 2-1-1 is designed on the bottom plate fixing fixture 2-1. The positioning hole 2-1-1 adopts a through-hole structure, and the fixture is fixed on the three-axis moving platform with bolts. The bottom plate fixing fixture 2-1 is provided with a hole axis 2-1-2, a hinge hole 2-1-2 for connecting the clamping cover plate 2-2, a multi-core V-shaped fixing groove 2-1-3 (for placing the optical fiber) and a first permanent magnet 2-1-4. The clamping cover plate 2-2 is provided with a connecting hinge axis 2-2-1, a fixing groove 2-2-2 and a second permanent magnet 2-2-3. The V-shaped fixing groove 2-1-3 on the bottom plate fixing fixture 2-1 is made by precision machining technology, with a notch angle of 90°, a depth of 2mm and a surface roughness of Ra0.4, which ensures the stability of the optical fiber placement.

[0033] The innovation of this embodiment is to adopt a magnetic fixing solution, and embed the first permanent magnet 2-1-4 and the second permanent magnet 2-2-3 in the bottom plate fixing fixture 2-1 and the clamping cover plate 2-2 respectively. The magnet can be made of N35 neodymium iron boron material, with a size of φ3mm×2mm and a magnetic strength of about 3N. Through the attraction of opposite poles of the magnet, the optical fiber can be stably and reliably fixed, and the operation is convenient. The hinge structure is made of stainless steel to ensure flexible opening and closing while having good durability.

[0034] The structural design of the collimator fixing fixture is similar to that of the optical fiber fixture. The collimator fixing fixture includes a base plate 2-4 and a cover plate 2-5. The base plate 2-4 is provided with a mounting hole 2-4-1 for fixing the base plate 2-4 to the three-axis mobile platform, a hinge hole 2-4-2 for connecting the cover plate 2-5, a V-shaped fixing groove 2-4-3 and a third permanent magnet 2-4-4 for fixing the collimator. The cover plate 2-5 is provided with a hinge shaft 2-5-1, a fixed V-groove 2-5-2, and a fourth permanent magnet 2-5-3, but special treatment is made in the design of the V-groove. The depth of the V-groove 2-4-3 of the collimator fixture is increased, and a corresponding opposite V-groove 2-5-2 is designed on the cover plate to form a bidirectional clamping structure, which improves the fixing stability of the collimator.

[0035] The CDD image recognition control system includes the CDD image system's vertical moving platform 3-1, horizontal moving platform 3-2, image fixing platform 3-3, CDD image fixing fixture 3-4, CDD image 3-5, CDD image feedback processing system 3-6 and UV light illumination system 3-7. The CDD image recognition control system can manually or automatically control the up and down, left and right movement of the CDD image platform, as well as the rotation of the CDD image, making it easier to align the equipment during the debugging process, greatly shortening the entire platform's construction and verification test. Figure 17-21 As shown, the vertical moving platform 3-1 and the horizontal moving platform 3-2 include the following structures: a dovetail groove boss 3-1-1 is provided on the vertical moving platform 3-1, and an upper dovetail groove 3-2-1 is provided on the horizontal moving platform 3-2. The dovetail groove boss 3-1-1 and the dovetail groove 3-2-1 cooperate to realize the linear displacement in the Z-axis direction, ensuring that both have and only have one degree of freedom in the Z-axis direction, realizing the connection between the vertical moving platform 3-1 and the horizontal moving platform 3-2 while ensuring that the horizontal moving platform 3-2 can move up and down on the vertical moving platform 3-1, wherein the three groups of threaded holes 3-1-2 provided on the vertical moving platform 3-1 are used to install screws. When the horizontal moving platform 3-2 is adjusted to a reasonable position, the screws can be tightened to fix the horizontal moving platform 3-2; The movable platform 3-2 is provided with a first dovetail groove 3-2-1 and a second dovetail groove 3-2-2. The first dovetail groove 3-2-1 and the second dovetail groove 3-2-2 are arranged vertically in different planes. The first dovetail groove 3-2-1 is used to cooperate with the dovetail groove boss 3-1-1, and the second dovetail groove 3-2-2 is used to cooperate with the dovetail groove protrusion 3-3-1 on the image fixing platform 3-3, so as to fix the image fixing platform 3-3. The image fixing platform 3-3 can move horizontally under the action of the second dovetail groove 3-2-2, thereby driving the horizontal movement of the entire CDD imaging platform. The threaded holes 3-2-3 provided on the horizontal movable platform 3-2 are used to install screws. When the image fixing platform 3-3 is adjusted to a reasonable position in the horizontal direction, the image fixing platform 3-3 is fixed by tightening the screws.

[0036] The control system uses binocular vision algorithm and real-time image processing technology to accurately identify the relative position of the optical fiber and the collimator. When the system detects that the two are concentric and the end faces are tangent, it automatically triggers the alignment completion signal. Subsequently, the system controls the dispensing device to accurately dispense glue, and the amount of glue dispensed can be accurately controlled by software within the range of 0.01-0.05ml. After the dispensing is completed, the UV light illumination system 3-7 automatically starts, providing ultraviolet light with a wavelength of 365nm, and the light intensity can be adjusted from 0-100mW / cm² to ensure that the glue is cured quickly and evenly.

[0037] Embodiment 3: The present invention also discloses a method for realizing coupling between an optical fiber and an optical fiber collimator based on a device, wherein the optical fiber collimator is a gradient refractive index lens, and the refractive index distribution of the gradient refractive index lens satisfies the following in, is the refractive index at a distance r from the optical axis, is the central refractive index, is the refractive index gradient constant; the inner core diameter of the optical fiber is , the cladding thickness is , the refractive index of the inner core is The refractive index of the cladding is , the following conditions are met: ; Align the fiber collimator with the optical fiber so that the output optical axis of the fiber collimator coincides with the central axis of the optical fiber, and the alignment error is less than ,in ; Use UV curing glue to fix the optical fiber and the optical fiber collimator. The curing time is , the curing temperature is , the following conditions are met: , .

[0038] Preferably, under the optical signal with wavelength λ, the coupling efficiency is greater than η, where ; Insertion loss is less than ,in ; Return loss is greater than ,in ; In the temperature range The coupling performance is stable, among which , .

[0039] In a specific embodiment of the present invention, the optical fiber collimator uses a central refractive index , refractive index gradient constant GRIN Lens is used as a collimator, and the inner core diameter of the optical fiber = , cladding thickness , the core refractive index =1.3, cladding refractive index =1.45; the optical fiber collimator is aligned with the light through the platform of the present invention, and the alignment error is controlled within =0.2 m; use UV curing glue to fix the fiber collimator and the optical fiber, the curing time is t=10s, and the curing temperature is T=25 After testing, under the optical signal with a wavelength of 1550nm, the coupling efficiency is 90%, the insertion loss is ≤0.3dB, the return loss is ≥60dB, and the coupling performance is stable in the temperature range of -45℃, +85℃.

[0040] In another specific embodiment of the present invention, the optical fiber collimator uses a central refractive index , refractive index gradient constant GRIN Lens is used as a collimator, and the inner core diameter of the optical fiber = , cladding thickness , the core refractive index =1.2, cladding refractive index =1.4; the optical fiber collimator is aligned with the light through the platform of the present invention, and the alignment error is controlled within =0.3 m; use UV curing glue to fix the fiber collimator and the optical fiber, the curing time is t=15s, and the curing temperature is T=30 After testing, under the optical signal with a wavelength of 1310nm, the coupling efficiency is 95%, the insertion loss is ≤0.3dB, the return loss is ≥55dB, and the coupling performance is stable within the temperature range of -45℃, +85℃.

[0041] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A device for coupling an optical fiber and an optical fiber collimator, characterized in that: The invention comprises a shockproof platform, on which two multi-axis mobile positioning platforms are arranged, one of which is provided with an optical fiber fixing fixture, and the other multi-axis mobile positioning platform is provided with a collimator fixing fixture. The shockproof platform is also provided with a CDD image recognition control system for realizing the alignment coupling between the optical fiber in the optical fiber fixing fixture and the optical fiber collimator in the collimator fixing fixture.

2. The device for coupling an optical fiber and an optical fiber collimator according to claim 1, characterized in that: The anti-vibration platform is provided with a shock absorbing spring and a threaded hole for connecting the multi-axis mobile positioning platform.

3. The device for coupling an optical fiber and an optical fiber collimator according to claim 1, characterized in that: The multi-axis mobile positioning platform includes at least one first linear module extending along the X-axis, the mobile end of the first linear module is connected to at least one second linear module extending along the Y-axis, the mobile end of the first linear module is connected to at least one third linear module extending along the Z-axis, and the mobile end of the third linear module is connected to a fixture fixing platform.

4. The device for coupling an optical fiber and an optical fiber collimator according to claim 3, characterized in that: The first linear module, the second linear module and the third linear module are a mobile control platform, which includes a knob control unit for realizing position adjustment in the Y-axis direction through rotation operation; a platform fixed base, on which the knob control unit is fixed; a spring guide ejector pin connected to the knob control unit and capable of reciprocating along the Y-axis direction; a precision compression spring located between the spring guide ejector pin and the upper mobile platform; and the upper mobile platform in contact with the spring guide ejector pin and moves therewith.

5. The device for coupling an optical fiber and an optical fiber collimator according to claim 4, characterized in that: The knob control unit comprises a knob control unit fixing base, a knob control platform fixing hole and a knob, wherein the knob is axially limitedly installed in the knob control platform fixing hole, and the knob can rotate around its own axis; a main body plate is arranged on the platform fixing base, and a knob control unit fixing threaded hole, a dovetail control platform and a spring guide ejector fixing thread are arranged on the main body plate, and a main body guide ejector is fixedly connected in the spring guide ejector fixing thread; the spring guide ejector comprises a main body guide ejector, an external thread and a spring, and the external thread cooperates with the spring guide ejector fixing threaded hole to fix the spring guide ejector; the upper movable platform comprises a main body, a dovetail protrusion groove and a guide ejector guide structure, and the spring is located between the guide ejector guide structure and the spring guide ejector fixing thread; the knob control unit is fixed on the platform fixing base, and when the knob is rotated, the ejector thereon will move outward or inward.

6. The device for coupling an optical fiber and an optical fiber collimator according to claim 1, characterized in that: The optical fiber fixing fixture includes a base plate fixing fixture and a clamping cover plate, the base plate fixing fixture is provided with a hole for connecting the multi-axis mobile positioning platform, a hole axis for connecting the clamping cover plate, an optical fiber fixing groove for fixing the optical fiber and a first permanent magnet for fixing and connecting the clamping cover plate, the clamping cover plate is provided with a second permanent magnet, and the arrangement positions of the first permanent magnet and the second permanent magnet correspond to each other.

7. The device for coupling an optical fiber and an optical fiber collimator according to claim 1, characterized in that: The collimator fixing fixture includes a base plate and a cover plate, the base plate is provided with a hole for connecting the multi-axis mobile positioning platform, a hole axis for connecting the cover plate, a collimator fixing groove for fixing the optical fiber collimator and a third permanent magnet, the cover plate is provided with a fourth permanent magnet, and the arrangement positions of the third permanent magnet and the fourth permanent magnet correspond to each other.

8. The device for coupling an optical fiber and an optical fiber collimator according to claim 1, characterized in that: The CDD image recognition control system includes a position adjustment unit and an imaging unit connected to the displacement end of the position adjustment component; the position adjustment unit includes a vertical moving platform extending along the Z axis, a horizontal moving platform extending along the X axis is connected to the vertical moving platform, a rotating platform rotatable around the Y axis is connected to the horizontal moving platform, and the imaging unit is connected to the rotating platform; the imaging unit includes a CDD, a CDD image feedback processing system and a UV light illumination system; two rotating platforms rotatable around the Y axis are connected to the horizontal moving platform, and each rotating platform is connected to an imaging unit.

9. The device for coupling an optical fiber and an optical fiber collimator according to claim 3, characterized in that: The multi-axis mobile positioning platform may further include at least one first rotating module rotating around an X-axis and / or at least one first rotating module rotating around a Y-axis and / or at least one first rotating module rotating around a Z-axis.

10. A method for coupling an optical fiber and an optical fiber collimator based on the device according to any one of claims 1 to 9, characterized in that: The fiber collimator is a gradient index lens, and the refractive index distribution of the gradient index lens satisfies the following in, is the refractive index at a distance r from the optical axis, is the central refractive index, is the refractive index gradient constant; the inner core diameter of the optical fiber is , the cladding thickness is , the refractive index of the inner core is The refractive index of the cladding is , the following conditions are met: ; Align the fiber collimator with the optical fiber so that the output optical axis of the fiber collimator coincides with the central axis of the optical fiber, and the alignment error is less than ,in ; Use UV curing glue to fix the optical fiber and the optical fiber collimator. The curing time is , the curing temperature is , the following conditions are met: , .

11. The method for achieving coupling between an optical fiber and an optical fiber collimator according to claim 10, characterized in that: For an optical signal with a wavelength of λ, the coupling efficiency is greater than η, where ; Insertion loss is less than ,in ; Return loss is greater than ,in ; In the temperature range The coupling performance is stable, among which , .

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