Optical fiber transmission clamp

Abstract

The utility model relates to the technical field of structural parts of optical element devices, and discloses an optical fiber transmission clamp which comprises a transmission insertion core which is provided with a through hole with the aperture size changing from large to small and is used for enabling an optical fiber to penetrate in from the large-aperture end of the through hole and penetrate out from the small-aperture end for transmission, and the small-aperture end is used for carrying out radial positioning on the optical fiber; the insertion core clamping device is used for elastically clamping the transmission insertion core in a fixed state and fixing and positioning the transmission insertion core; and the base is used for coaxially assembling a plurality of insertion core holders so as to ensure that the optical fiber is stably and optically coaxially transmitted between two adjacent transmission insertion cores. Through the accurate aperture design, the use of the elastic clamp holder and the design of the coaxial base, the technical problems of the existing optical fiber transmission clamp in the aspects of operation complexity, optical fiber damage, poor consistency and the like are effectively solved, and the optical fiber transmission efficiency and reliability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of structural parts of optical element devices, in particular to an optical fiber transmission clamp. Background Art

[0002] In the manufacturing process of distributed fiber Bragg gratings, the fiber clamp plays a vital role. It not only needs to ensure the relative position between the optical fiber and the mask is fixed to ensure the accurate writing of the grating, but also ensure the stable transmission of the optical fiber during the writing process.

[0003] Traditional fiber clamps often use hard materials and pressure plate structures to directly clamp the optical fiber. This method is easy to damage the thin and easily broken optical fiber, and it also requires repeated placement of the optical fiber, which introduces large human errors and leads to poor consistency of the distributed fiber grating array. At the same time, traditional fiber clamps are complicated to operate, with relatively high design and manufacturing costs, and cannot realize the transmission of optical fibers, which is not conducive to the large-scale production and application of distributed fiber grating arrays. Utility Model Content

[0004] The utility model provides an optical fiber transmission clamp, which effectively solves the technical problems of the existing optical fiber transmission clamp in terms of operation complexity, optical fiber damage and poor consistency through precise aperture design, the use of an elastic clamp and the design of a coaxial base, thereby improving the efficiency and reliability of optical fiber transmission.

[0005] The utility model provides an optical fiber transmission fixture, comprising: a transmission ferrule, which has a through hole with a diameter varying from large to small, and is used to allow the optical fiber to penetrate from the large-diameter end of the through hole and pass out from the small-diameter end for transmission, and the small-diameter end is used to radially position the optical fiber; a ferrule clamper, which is used to elastically clamp the transmission ferrule in a fixed state and to fix and position the transmission ferrule; and a base, which is used to coaxially assemble a plurality of ferrule clampers to ensure that the optical fiber is stably and optically coaxially transmitted between two adjacent transmission ferrules.

[0006] Furthermore, the transmission insert includes a cylindrical base, a first end of the cylindrical base is provided with a guide area for guiding the optical fiber to enter, a second end of the cylindrical base is provided with a clamping area for clamping and positioning the optical fiber, the radial dimension of the guide area is greater than the radial dimension of the clamping area, a transition area is provided between the guide area and the clamping area, the radial dimension of the transition area gradually decreases from the guide area to the clamping area in a conical shape, the guide area, the transition area and the clamping area are coaxially arranged and together constitute an axially penetrating through hole.

[0007] Furthermore, the cone angle of the transition zone is 30° to 80°.

[0008] Furthermore, the cone angle of the transition zone is 60°.

[0009] Furthermore, the ferrule clamp includes a sliding base plate and a vertical plate, the sliding base plate can be slidably assembled on the base and fixedly connected to the base after sliding; a mounting groove is opened from top to bottom on the top of the vertical plate, the bottom of the mounting groove is set as a cylindrical hole with a radial dimension larger than the groove width, and the groove area of ​​the mounting groove is provided with an assembly hole matching the outer periphery of the transmission ferrule, the cylindrical hole is arranged parallel to the assembly hole and parallel to the transmitted optical fiber; a fixing screw for locking the mounting groove is also provided on the vertical plate, and the fixing screw and the assembly hole are arranged vertically in space.

[0010] Furthermore, a first connecting hole is vertically opened on the sliding base plate, and a positioning screw passes through the first connecting hole and is connected to the base.

[0011] Furthermore, the base adopts a U-shaped plate, and the U-shaped plate has an avoidance opening for fiber grating writing.

[0012] Furthermore, two parallel support plates of the U-shaped plate are respectively provided with sliding grooves for slidably assembling the insert clamp, the sliding grooves of the two support plates are identical grooves with the same shape and size, and the two sliding grooves are coaxially arranged.

[0013] Furthermore, a second connection hole is provided at the bottom of the slide groove, and a plurality of second connection holes are arranged at intervals along the length direction of the slide groove.

[0014] Furthermore, the U-shaped plate is also provided with a plurality of six-axis translation stage positioning through holes for fixedly positioning and connecting with the six-dimensional translation stage.

[0015] The utility model has the following beneficial effects:

[0016] The optical fiber transmission fixture of the utility model uses a transmission ferrule with a through hole whose aperture size changes from large to small, so that the optical fiber can be smoothly inserted from the large aperture end and passed out from the small aperture end, thereby reducing the damage to the optical fiber during the insertion process; the small aperture end radially positions the optical fiber, thereby ensuring that the optical fiber maintains the correct position and direction when passing through the ferrule, thereby ensuring the optical coaxiality of the optical fiber in the transmission; by controlling the aperture change, the friction and pressure on the optical fiber when passing through the ferrule are minimized, thereby reducing the possibility of damage; the elastic clamping function of the ferrule clamper makes the installation and positioning of the optical fiber more direct and easy, thereby reducing the complexity of the operation; the ferrule clamper elastically clamps the transmission ferrule to fix the transmission ferrule in position, thereby simplifying the installation and positioning process of the optical fiber, thereby making the operation simpler and faster; the base is used for coaxially assembling multiple ferrule clamps, thereby ensuring that the optical fiber is stably and optically coaxially transmitted between two adjacent transmission ferrules, thereby ensuring the precise alignment and stable transmission of the optical fiber between each ferrule, thereby improving the overall consistency and stability. Through precise aperture design, the use of elastic clamps and the design of coaxial base, the technical problems of existing optical fiber transmission fixtures in terms of operation complexity, optical fiber damage and poor consistency are effectively solved, and the efficiency and reliability of optical fiber transmission are improved.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a structural schematic diagram of the optical fiber transmission clamp in use state of the preferred embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the transmission insert of the preferred embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the ferrule holder of the preferred embodiment of the utility model;

[0022] Figure 4 It is a structural schematic diagram of a base of a preferred embodiment of the utility model;

[0023] Figure 5 This is a relative position diagram between the optical fiber and the phase mask in the microscopic observation system of the preferred embodiment of the utility model;

[0024] Figure 6 It is a schematic diagram of ensuring the distance stability between the optical fiber and the phase mask during the process of using the transmission ferrule to transmit the optical fiber in the preferred embodiment of the utility model.

[0025] Legend:

[0026] 100, transmission insert; 101, cylindrical base; 102, guide area; 103, clamping area; 104, transition area; 200, insert holder; 201, sliding base plate; 202, vertical plate; 203, mounting groove; 204, cylindrical hole; 205, assembly hole; 206, set screw; 207, first connecting hole; 208, positioning screw; 300, base; 301, avoidance; 302, support plate; 3021, slide groove; 3022, second connecting hole; 303, six-axis translation stage positioning hole; 400, optical fiber; 500, phase mask; 600, microscope system. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0028] Figure 1 This is a structural schematic diagram of the optical fiber transmission clamp in use according to a preferred embodiment of the utility model; Figure 2 This is a schematic diagram of the structure of the transmission insert of the preferred embodiment of the utility model; Figure 3 It is a structural schematic diagram of the ferrule holder of the preferred embodiment of the utility model; Figure 4 It is a structural schematic diagram of a base of a preferred embodiment of the utility model; Figure 5 This is a relative position diagram between the optical fiber and the phase mask in the microscopic observation system of the preferred embodiment of the utility model; Figure 6 It is a schematic diagram of ensuring the distance stability between the optical fiber and the phase mask during the process of using the transmission ferrule to transmit the optical fiber in the preferred embodiment of the utility model.

[0029] like Figure 1As shown, the optical fiber transmission fixture of this embodiment includes: a transmission ferrule 100, which has a through hole with an aperture size varying from large to small, and is used to allow the optical fiber 400 to pass through the through hole from the large aperture end and pass through the small aperture end for transmission, and the optical fiber 400 is radially positioned by using the small aperture end; a ferrule clamp 200, which is used to elastically clamp the transmission ferrule 100 in a fixed state and fix the transmission ferrule 100 in position; a base 300, which is used to coaxially assemble multiple ferrule clamps 200 to ensure that the optical fiber 400 is stably and optically coaxially transmitted between two adjacent transmission ferrules 100. The optical fiber transmission fixture of the utility model uses a transmission ferrule 100 with a through hole whose aperture size changes from large to small, so that the optical fiber 400 can be smoothly inserted from the large-aperture end and passed out from the small-aperture end, thereby reducing the damage to the optical fiber 400 during the threading process; the small-aperture end radially positions the optical fiber 400, thereby ensuring that the optical fiber 400 maintains the correct position and direction when passing through the ferrule, and ensuring the optical coaxiality of the optical fiber 400 in the transmission; by controlling the aperture change, the friction and pressure on the optical fiber 400 when passing through the ferrule are minimized, thereby reducing the possibility of damage; through the ferrule clamp 20 0, the installation and positioning of the optical fiber 400 becomes more direct and easy, and the complexity of the operation is reduced; the ferrule holder 200 elastically clamps the transmission ferrule 100 to fix the transmission ferrule 100, which can simplify the installation and positioning process of the optical fiber 400, making the operation easier and faster; the base 300 is used to coaxially assemble multiple ferrule holders 200, which can ensure that the optical fiber 400 is stably and optically coaxially transmitted between two adjacent transmission ferrules 100, ensuring the precise alignment and stable transmission of the optical fiber 400 between each ferrule, thereby improving the overall consistency and stability. Through the precise aperture design, the use of the elastic holder and the design of the coaxial base 300, the technical problems of the existing optical fiber 400 transmission fixture in terms of operational complexity, optical fiber damage and poor consistency are effectively solved, and the efficiency and reliability of the optical fiber 400 transmission are improved.

[0030] like Figure 1 and Figure 2As shown, in this embodiment, the transmission insert 100 includes a cylindrical base 101, a first end of the cylindrical base 101 is provided with a guide area 102 for guiding the optical fiber 400 to enter, a second end of the cylindrical base 101 is provided with a clamping area 103 for clamping and positioning the optical fiber 400, a radial dimension of the guide area 102 is greater than a radial dimension of the clamping area 103, a transition area 104 is provided between the guide area 102 and the clamping area 103, a radial dimension of the transition area 104 gradually decreases from the guide area 102 to the clamping area 103 in a conical shape, the guide area 102, the transition area 104 and the clamping area 103 are coaxially arranged and together constitute an axially penetrating through hole. The radial dimension of the guide area 102 is larger than that of the clamping area 103, so that the optical fiber 400 can enter from the first end of the transmission ferrule 100 more easily and pass through the guide area 102 smoothly; the larger radial dimension provides sufficient space for the optical fiber 400, reducing the resistance and damage risk during insertion; the radial dimension of the transition area 104 gradually decreases from the guide area 102 to the clamping area 103. This conical design allows the optical fiber 400 to gradually adapt to smaller and smaller apertures in the process of entering the clamping area 103 from the guide area 102; this progressive design helps to protect the optical fiber 400 from damage when passing through the ferrule, while ensuring that the optical fiber 400 can be accurately positioned in the clamping area 103; the radial dimension of the clamping area 103 is the smallest, slightly smaller than the radial dimension of the optical fiber 400, and is used The optical fiber 400 is clamped and positioned. The precise clamping of the clamping area 103 can ensure that the optical fiber 400 is fixed in the ferrule to prevent displacement or falling off during subsequent operations or use. The guide area 102, the transition area 104 and the clamping area 103 are coaxially arranged, which means that they are all located on the same axis, ensuring that the optical fiber 400 maintains optical coaxiality when passing through the transmission ferrule 100, which is crucial for maintaining the transmission quality of the optical signal and reducing optical loss. The guide area 102, the transition area 104 and the clamping area 103 together constitute an axially penetrating through hole, which allows the optical fiber 400 to pass smoothly from the first end of the ferrule to the second end. The design of the through hole allows the optical fiber 400 to be transmitted in a straight line inside the ferrule, reducing the path deviation of the optical signal and improving the transmission efficiency.

[0031] like Figure 1 and Figure 2As shown, in this embodiment, the taper angle of the transition zone 104 is 30° to 80°. The taper angle between 30° and 80° can ensure that the optical fiber 400 gradually adapts to the reduced aperture when transitioning from the guide zone 102 to the clamping zone 103, providing sufficient gradualness so that the optical fiber 400 will not be subjected to sudden bending or excessive compression when passing through the ferrule, thereby reducing the risk of damage. When the taper angle is small and less than 30°, the insertion force of the optical fiber 400 is small, but the positioning stability is poor; when the taper angle is large and greater than 80°, the positioning stability is good, but the insertion force may be large; the range of 30° to 80° balances these two factors, making the optical fiber 400 easy to insert and stably positioned in the clamping zone 103; different optical fibers 400 may have different diameters, and the taper angle range of 30° to 80° can adapt to optical fibers 400 of different diameters, ensuring that they can all pass through the transition zone 104 smoothly and be correctly positioned in the clamping zone 103. An appropriate taper angle helps to reduce the optical loss of the optical fiber 400 during the transition process; if the taper angle is too small, the optical fiber 400 may not be effectively guided and positioned, resulting in increased optical loss; if the taper angle is too large, the optical fiber 400 may be subjected to excessive bending, which will also increase optical loss. When the taper angle is too small and less than 30°, the optical fiber 400 may be excessively bent in the transition zone 104, increasing optical loss, and may even cause the optical fiber 400 to break or be damaged. When the taper angle is too large and greater than 80°, the optical fiber 400 may require greater force during the insertion process, which may cause additional pressure and damage to the optical fiber 400. In addition, an excessively large taper angle may also cause the positioning of the optical fiber 400 in the clamping zone 103 to be inaccurate, affecting the stability and transmission quality of the optical fiber 400. The taper angle range of 30° to 80° is optimized to ensure smooth guidance, positioning stability and minimized optical loss of the optical fiber 400.

[0032] like Figure 1 and Figure 2As shown, in this embodiment, the taper angle of the transition zone 104 is 60°. The 60° taper angle provides a moderate slope, so that the optical fiber 400 can smoothly adapt to the gradual reduction of the aperture when transitioning from the guide zone 102 to the clamping zone 103, which helps to reduce the risk of damage to the optical fiber 400 when passing through the ferrule, while ensuring that the optical fiber 400 can be effectively positioned; the 60° taper angle balances the force required for the insertion of the optical fiber 400 and the stability in the clamping zone 103, and neither causes excessive insertion force nor insufficient stability of the optical fiber 400 in the clamping zone 103, thereby ensuring the reliability of the optical fiber 400 during insertion and use; the 60° taper angle can It can adapt to optical fibers 400 of different diameters, ensuring that they can all pass through the transition zone 104 smoothly and be correctly positioned in the clamping zone 103. This flexibility is suitable for the use of optical fibers 400 of different specifications; the 60° cone angle helps to reduce the optical loss of the optical fiber 400 during the transition process; the 60° cone angle makes it easier to insert and position the optical fiber 400, reduces the complexity of the operation process, and improves the work efficiency; the 60° cone angle helps to maintain the optical coaxiality of the optical fiber 400 when passing through the transmission ferrule 100, which is crucial to maintaining the transmission quality of the optical signal and reducing optical loss.

[0033] like Figure 1 and Figure 3As shown, in this embodiment, the ferrule clamp 200 includes a sliding base plate 201 and a vertical plate 202, the sliding base plate 201 can be slidably assembled on the base 300 and fixedly connected to the base 300 after sliding; a mounting groove 203 is opened on the top of the vertical plate 202 from top to bottom, the groove bottom of the mounting groove 203 is set as a cylindrical hole 204 with a radial dimension greater than the groove width, and the groove area of ​​the mounting groove 203 is provided with an assembly hole 205 matching the outer periphery of the transmission ferrule 100, the cylindrical hole 204 is arranged parallel to the assembly hole 205 and parallel to the transmitted optical fiber 400; a fixing screw 206 for locking the mounting groove 203 is also provided on the vertical plate 202, and the fixing screw 206 and the assembly hole 205 are arranged vertically in space. The sliding substrate 201 can be slidably assembled on the base 300 to form basic positioning and limiting between each other, and allow the transmission plug 100 to be fine-tuned during the assembly process to ensure precise alignment; after the assembly is completed, the sliding substrate 201 can be fixedly connected to the base 300 to maintain the stable position of the transmission plug 100; the mounting groove 203 on the vertical plate 202 is designed so that the radial dimension of the cylindrical hole 204 at the bottom of the groove is larger than the groove width, so that the mounting groove 203 has a certain opening and closing elasticity based on the cylindrical hole 204, which helps to ensure that the transmission plug 100 is quickly installed in the mounting groove 203, and at the same time, the cylindrical hole 204 is arranged in parallel with the assembly hole 205 and parallel to the optical fiber 400, which helps to maintain the coaxiality and alignment of the optical fiber when passing through the plug; the assembly hole 205 matches the outer periphery of the transmission plug 100 and is combined with the elastic opening and closing characteristics of the mounting groove 203, which means that the plug clamping The device 200 can be adapted to transmission ferrules 100 of different sizes, which increases the versatility and flexibility of the clamp; a set screw 206 is provided on the vertical plate 202 for locking the mounting slot 203 to ensure that the assembled transmission ferrule 100 will not be displaced or rotated during operation, thereby improving the stability and reliability of the entire system; the set screw 206 and the assembly hole 205 are arranged vertically in space, and this layout helps to save space while ensuring that the set screw 206 does not interfere with the transmission path of the optical fiber 400 when tightened; since the sliding base plate 201 can slide and be fixed, when the transmission ferrule 100 needs to be maintained or replaced, the ferrule can be easily removed from the base 300 to perform necessary operations; the design of the entire ferrule clamp 200 allows the transmission ferrule 100 to be installed quickly and accurately, while ensuring the uniformity of the installation, thereby improving the efficiency of assembly and maintenance.

[0034] like Figure 1 and Figure 3As shown, in this embodiment, a first connection hole 207 is vertically opened on the sliding base 201, and a positioning screw 208 passes through the first connection hole 207 and is connected to the base 300. By passing the positioning screw 208 through the first connection hole 207 and connecting to the base 300, the position of the sliding base 201 relative to the base 300 can be accurately positioned, ensuring that the sliding base 201 will not be displaced after being fixed, thereby ensuring the precise alignment and stability of the transmission plug 100; before fixing, the first connection hole 207 allows the position of the sliding base 201 to be fine-tuned by adjusting the position of the positioning screw 208 to achieve optimal alignment and assembly, and this fine-tuning capability is conducive to ensuring the precise docking between the optical fiber 400 and the transmission plug 100; the positioning screw 208 provides a solid connection point, so that the sliding base 201 can resist external forces after being fixed. force, such as vibration or impact, thereby maintaining the stability of the structure; the design of the first connecting hole 207 and the positioning screw 208 makes the assembly and disassembly of the sliding base plate 201 simple and quick, and is convenient for maintenance, replacement or upgrading of the transmission insert 100, thereby improving the convenience of operation; since the positioning screw 208 can accurately control the position of the sliding base plate 201 through the first connecting hole 207, the accuracy of repeated positioning is ensured, which is particularly important for occasions that require frequent disassembly and reassembly; the design of the first connecting hole 207 allows the use of positioning screws 208 of different lengths to adapt to different assembly requirements and configurations of the base 300, thereby increasing the flexibility and compatibility of the entire system.

[0035] like Figure 1 and Figure 4 As shown, in this embodiment, the base 300 adopts a U-shaped plate, and the U-shaped plate has a avoidance opening 301 for grating writing of the optical fiber 400. The avoidance opening 301 provides necessary space for grating writing of the optical fiber 400, so that the writing equipment can easily contact the optical fiber 400 without being blocked by the base 300; by providing the avoidance opening 301 on the U-shaped plate, damage to the base 300 during the grating writing process can be avoided, and the integrity and durability of the base 300 can be maintained; the avoidance opening 301 ensures that the writing equipment can approach the optical fiber 400, which helps to improve the accuracy and quality of grating writing, because the writing equipment can more accurately control the writing position and depth.

[0036] like Figure 1 and Figure 4As shown, in this embodiment, two parallel support plates 302 of the U-shaped plate are respectively provided with a slide groove 3021 for slidably assembling the ferrule holder 200, and the slide grooves 3021 of the two support plates 302 are identical grooves with the same shape and size, and the two slide grooves 3021 are coaxially arranged. The two slide grooves 3021 of the same shape and size ensure the symmetry and consistency of the U-shaped plate, which helps to maintain the structural balance and stability of the entire base 300; the slide groove 3021 allows the ferrule holder 200 to be slidably assembled on the two support plates 302 of the U-shaped plate, providing flexibility in the assembly process, so that the ferrule holder 200 can adjust its position as needed; the two slide grooves 3021 are coaxially arranged, which helps to ensure that the optical fiber 400 passing through the ferrule holder 200 maintains coaxial alignment, which is beneficial to ensure the transmission quality of the optical signal and reduce optical loss; the slide grooves 3021 of the same shape and size mean that they can be used interchangeably, which helps standardization. The assembly process is simplified, and the operation of maintaining and replacing the ferrule holder 200 is simplified; using the slide groove 3021 of the same shape and size can simplify the design and manufacturing process of the U-shaped plate, and reduce the manufacturing complexity and cost; the coaxially arranged slide groove 3021 helps to improve the positioning accuracy of the optical fiber 400 during the assembly process, thereby improving the reliability and performance of the entire system; the standardized slide groove 3021 design facilitates the operation of the automated assembly line, which can improve production efficiency and reduce human errors; if the system needs to be expanded or more ferrule holders 200 need to be added, the slide groove 3021 of the same shape and size can be easily expanded without redesigning the U-shaped plate.

[0037] like Figure 1 and Figure 4 As shown, in this embodiment, a second connection hole 3022 is opened at the bottom of the slide groove 3021 , and a plurality of second connection holes 3022 are arranged at intervals along the length direction of the slide groove 3021 . The second connecting hole 3022 allows the ferrule holder 200 to be fixed at different positions in the slide groove 3021, and provides multiple fixing points, so that the position of the ferrule holder 200 can be precisely adjusted as needed to achieve optimal alignment and assembly, which is beneficial to ensure the accurate docking and transmission of the optical fiber 400. At the same time, after fixation, it can also enhance the stability of the entire structure and reduce displacement caused by vibration or other external forces; the spaced arrangement of the second connecting holes 3022 allows for ferrule holders 200 of different lengths to be accommodated, providing flexible assembly options to meet different design and functional requirements; multiple second connecting holes 3022 make it possible to quickly find a suitable fixing position during assembly and maintenance, simplifying the operating process and improving efficiency; if more ferrule holders 200 need to be added to the U-shaped plate, the spaced arrangement of the second connecting holes 3022 provides convenient expandability without the need for additional modifications to the slide groove 3021.

[0038] like Figure 1 and Figure 4As shown, in this embodiment, the U-shaped plate is also provided with a plurality of six-axis displacement stage positioning holes 303 for fixed positioning connection with the six-dimensional displacement stage. The six-axis displacement stage positioning holes 303 allow the U-shaped plate to be accurately docked and fixed with the six-dimensional displacement stage, thereby realizing precise control of the optical fiber 400 in six degrees of freedom (three translation directions of X, Y, and Z and three rotation directions); the six-axis displacement stage positioning holes 303 are fixedly connected with the six-dimensional displacement stage, thereby enhancing the stability and rigidity of the entire system, and reducing the vibration and displacement that may occur during operation; the design of the six-axis displacement stage positioning holes 303 simplifies the integration of the automation system, so that the U-shaped plate can be easily integrated into the automated assembly line or the precision positioning system; the design of the six-axis displacement stage positioning holes 303 makes it easier to maintain and upgrade the six-dimensional displacement stage or the U-shaped plate, which helps to reduce maintenance costs and improve system reliability.

[0039] In practice, a highly stable optical fiber transmission fixture is provided, the core components of which are two transmission inserts 100, which are key elements in the fiber grating writing and transmission process. The two transmission inserts 100 need to maintain not only physical stability but also optical coaxial state to ensure that the interference pattern during grating writing is accurate.

[0040] The internal design of the transmission ferrule 100 includes two apertures of different sizes to accommodate the precise positioning and protection of the optical fiber 400. Specifically, the aperture at the first end is designed to be slightly larger than the size of the optical fiber 400. This design allows the optical fiber 400 to be effectively clamped while avoiding damage to the optical fiber due to excessive compression. The middle part is designed with a 60-degree transition area (transition area 104), which provides a smooth contact surface for the optical fiber 400, thereby reducing stress concentration on the optical fiber 400 during the transmission process of the optical fiber 400. This transition design effectively avoids the breakage of the optical fiber 400 during high-pressure transmission or bending, ensuring the integrity of the optical fiber 400 and the continuity of the grating writing process.

[0041] Each transmission ferrule 100 is fixed by a special ferrule holder 200. The function of the ferrule holder 200 is to provide a stable support for the ferrule.

[0042] The ferrule holder 200 itself is fixed on a base 300 with a groove of specific size. This base 300 is usually made of a hard material, such as metal or engineering plastic, to ensure stability and durability during the use of the fixture. The groove on the base 300 is designed to accurately match the size of the ferrule holder 200, ensuring that the ferrule holder 200 can be firmly mounted on the base 300, while providing the necessary adjustment space to fine-tune the position of the transmission ferrule 100.

[0043] The base 300 is mounted on a high-precision six-dimensional translation stage. This configuration is to allow the fiber grating to be very close to the phase mask 500 during the writing process and the transmission process of the optical fiber 400.

[0044] The technical effects of the present invention are:

[0045] In view of the high design and manufacturing costs of the fiber transmission fixture in the current preparation process of distributed fiber grating arrays, and the complicated operation process of realizing the transmission of the optical fiber 400. A low-cost and high-stability fiber 400 transmission fixture is proposed. On the one hand, it ensures the precise positioning of the fiber grating during the writing process; on the other hand, through the sophisticated design of a pair of transmission inserts 100, it ensures that the relative position between the optical fiber 400 and the phase mask 500 remains constant during the transmission process, and there is no need to repeatedly take and put the optical fiber 400, which is simple and convenient to operate. It solves the problem that the cost of the optical fiber transmission fixture is high during the batch production of distributed fiber grating arrays, and the optical fiber position needs to be repeatedly adjusted, which affects the production efficiency.

[0046] In terms of the structural design of the transmission insert 100, Figure 2 As shown, its internal structure includes two apertures of different sizes, which respectively guide the optical fiber 400 to enter and clamp the optical fiber 400, specifically the large aperture D at the first end and the small aperture d at the second end. Between the two apertures, a tapered transition area (transition area 104) is specially designed. The slope of this area is 60 degrees. Its main function is to relieve the stress concentration on the optical fiber 400 when passing through the ferrule, and to avoid damage or breakage of the optical fiber 400 due to excessive local pressure. Therefore, the optical fiber 400 must be inserted from the large aperture end and pass through the tapered transition area (transition area 104) to the small aperture end. Taking a 250μm diameter optical fiber as an example, the large aperture D is designed to be 300μm, and the small aperture d is designed to be 260μm. The optical fiber 400 needs to follow a unidirectional mechanism when passing through the two transmission ferrules 100 to avoid the optical fiber 400 getting stuck inside and causing breakage. In order to ensure the stability of the optical fiber 400 during transmission, the transmission ferrule 100 is installed as follows Figure 3 The ferrule holder 200 shown in the figure can further ensure the stability of the optical fiber 400 during the transmission process. The bottom of the ferrule holder 200 is provided with an M4 threaded mounting hole for convenience of subsequent connection with the optical fiber 400. Figure 4The base 300 shown in the figure is installed and fixed. The slot width L on the base 300 is precisely matched with the size of the ferrule holder 200, so that the two fiber ferrules can achieve a high-precision coaxial state. Four through holes are designed in the groove of the base, which can adjust the installation and fixing positions of the two ferrule holders 200 respectively, thereby controlling the tension of the optical fiber 400 during the transmission process. The six-dimensional high-precision translation stage is installed and fixed to the base 300 through four M4 through holes. This high-precision control capability allows the optical fiber 400 to be very close to the phase mask 500 during the writing process and the transmission process while maintaining stability. After the high-stability optical fiber clamp is installed, Figure 1 As shown, both ends of the optical fiber 400 are fixed on the wheel structure to control the fiber release and fiber collection of the optical fiber 400. A CCD monitor (microscope system 600) is installed on the upper side of the phase mask plate 500 to monitor the distance between the optical fiber 400 and the phase mask plate 500 during the transmission of the optical fiber 400. The distance monitoring display is shown in FIG. Figure 5 As shown, the distance and parallelism between the optical fiber 400 and the phase mask 500 can be clearly observed.

[0047] The transmission smoothness test was carried out with an optical fiber 400 with a diameter of 250μm. According to the above operation process, the optical fiber was first passed through two transmission ferrules 100 in one direction, and the transmission ferrule 100 was installed and fixed in the ferrule holder 200. The two ferrule holders were installed and fixed through the M4 through holes in the base groove to achieve a high-precision coaxial state in the transmission direction of the optical fiber 400. The six-dimensional displacement platform was adjusted to adjust the optical fiber 400 to a state parallel to the phase mask 500, and the distance was controlled to 5μm. The optical fiber 50m was driven through the wheel structure, and the distance between the optical fiber 400 and the phase mask 500 was measured every 0.5m. Figure 6 It shows that the optical fiber 400 and the phase mask 500 always maintain a parallel state, the distance is basically consistent with the initial state, and the distance error is within ±0.2μm, which fully meets the distance requirement between the phase mask 500 and the optical fiber 400 during the fiber grating writing process. This shows that this example realizes long-distance, efficient and stable transmission on the optical fiber 400 with a diameter of 250μm, and verifies that the present invention still has high stable transmission stability and accuracy under low-cost design and preparation.

[0048] Matters not covered in this utility model are known technologies.

[0049] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

[0051] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An optical fiber transmission fixture, characterized in that: include: The transmission insert (100) has a through hole with a diameter varying from large to small, and is used to allow the optical fiber (400) to pass through the through hole from the large-diameter end and pass through the small-diameter end for transmission, and to use the small-diameter end to radially position the optical fiber (400); The insert core holder (200) is used to elastically clamp the transmission insert core (100) in a fixed state, and to fix and position the transmission insert core (100); A base (300) is used for coaxially assembling a plurality of ferrule holders (200) to ensure that the optical fiber (400) is stably and optically coaxially transmitted between two adjacent transmission ferrules (100); The transmission insert (100) comprises a cylindrical base (101); a guide area (102) for guiding the optical fiber (400) to enter is provided at a first end of the cylindrical base (101); a clamping area (103) for clamping and positioning the optical fiber (400) is provided at a second end of the cylindrical base (101); a transition area (104) is provided between the guide area (102) and the clamping area (103); and a cone angle of the transition area (104) is 30° to 80°.

2. The optical fiber transmission fixture according to claim 1, characterized in that: The radial dimension of the guide area (102) is greater than the radial dimension of the clamping area (103), the radial dimension of the transition area (104) gradually decreases from the guide area (102) toward the clamping area (103) to form a cone shape, and the guide area (102), the transition area (104) and the clamping area (103) are coaxially arranged and together form an axially penetrating through hole.

3. The optical fiber transmission fixture according to claim 2, characterized in that: The cone angle of the transition zone (104) is 60°.

4. The optical fiber transmission fixture according to claim 1, characterized in that: The ferrule holder (200) comprises a sliding base plate (201) and a vertical plate (202); the sliding base plate (201) is slidably mounted on the base (300) and is fixedly connected to the base (300) after sliding; A mounting groove (203) is provided at the top of the vertical plate (202) from top to bottom, the groove bottom of the mounting groove (203) is arranged as a cylindrical hole (204) whose radial dimension is larger than the groove width, and an assembly hole (205) matching the outer circumference of the transmission plug core (100) is arranged in the groove area of ​​the mounting groove (203), and the cylindrical hole (204) and the assembly hole (205) are arranged in parallel and are parallel to the transmission optical fiber (400); A set screw (206) for locking the mounting groove (203) is also provided on the vertical plate (202), and the set screw (206) and the assembly hole (205) are arranged vertically in space.

5. The optical fiber transmission fixture according to claim 4, characterized in that: A first connection hole (207) is vertically opened on the sliding base plate (201), and a positioning screw (208) passes through the first connection hole (207) and is connected to the base (300).

6. The optical fiber transmission fixture according to any one of claims 1 to 5, characterized in that: The base (300) is a U-shaped plate, and the U-shaped plate has an avoidance opening (301) for grating writing of the optical fiber (400).

7. The optical fiber transmission fixture according to claim 6, characterized in that: The two parallel support plates (302) of the U-shaped plate are respectively provided with slide grooves (3021) for slidably assembling the ferrule clamp (200); the slide grooves (3021) of the two support plates (302) are identical grooves with the same shape and size, and the two slide grooves (3021) are coaxially arranged.

8. The optical fiber transmission fixture according to claim 7, characterized in that: A second connection hole (3022) is provided at the bottom of the slide groove (3021), and a plurality of second connection holes (3022) are arranged at intervals along the length direction of the slide groove (3021).

9. The optical fiber transmission fixture according to claim 8, characterized in that: The U-shaped plate is also provided with a plurality of six-axis displacement platform positioning through holes (303) for fixed positioning connection with the six-dimensional displacement platform.

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