A method for processing a ring spot combiner

Abstract

The application relates to a ring spot combiner processing method and belongs to the technical field of ring spot combiners. The ring spot combiner processing method comprises the following steps: removing a coating layer of a preset number of optical fiber end portions to form bare fibers, and the bare fiber lengths of the optical fibers are sequentially increased; a fiber with a median bare fiber length is inserted into a central hole of a multi-hole tube with a preset number of hole positions, and the remaining optical fibers are respectively inserted into the remaining holes of the multi-hole tube; a volatile liquid is dropped on the bare fibers to gather the bare fibers of all the optical fibers into a bare fiber bundle, and the optical fibers are fixed at preset positions near the interface of the coating layer to form fixed parts; a sleeve is sleeved on the bare fiber bundle, and the residual volatile liquid on the bare fiber bundle is removed; the sleeve and the bare fibers are fixed at the sleeve opening of the sleeve by using low-refraction glue, and the sleeve and the bare fibers inside the sleeve are subjected to fusion tapering. Therefore, the ring spot combiner processing method saves operation time, reduces operation difficulty, and improves production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of annular spot bundle combiner technology, and specifically relates to a method for processing annular spot bundle combiners. Background Technology

[0002] As a core component of high-power fiber lasers, the performance of the ring-spot combiner depends on the precise positioning of the center fiber. Misalignment of the center fiber can lead to decreased optical path transmission efficiency, mode instability, and even device failure.

[0003] For the fabrication of ring-spot combiners and high-power pump combiners, the identification of the center fiber is crucial. To match the corresponding output fiber core or ensure that the target fiber becomes the center fiber or pump signal fiber, so that the optical path can transmit normally according to the preset path and thus achieve the corresponding application effect, the center fiber should be identified in advance, and its cross-sectional position should be at the center after the tube is drawn and tapered. However, the existing methods for identifying the center fiber can only obtain the position of the center fiber after tapering. The method of identifying the center fiber after the tapering is prepared means that fiber entanglement or misalignment is only discovered after the tapering is formed, resulting in serious material waste, extended preparation cycle, and reduced efficiency. Summary of the Invention

[0004] This invention provides a method for processing a ring-shaped fiber bundler, which solves the current technical problem of low efficiency in confirming the position of the central fiber after molten tapering.

[0005] This invention is achieved through the following technical solution: a method for processing a ring-spot bundle combiner, comprising removing a predetermined number of coating layers from the ends of optical fibers to form bare fibers, wherein the length of the bare fibers of each optical fiber increases sequentially; inserting the optical fiber with the middle bare fiber length into the central hole of a porous tube having a predetermined number of holes, and then inserting the remaining optical fibers into the remaining holes of the porous tube respectively, wherein the interfaces between the coating layers of all optical fibers and the bare fibers are in the same plane, and the bare fiber length of one of the optical fibers located on both sides of the diameter direction of the central hole is less than that of the optical fiber located at the central hole. The length of the fiber is greater than that of the fiber in the center hole; volatile liquid is dripped onto the bare fiber to gather all the bare fibers into a bundle, and the fiber is fixed at a predetermined position near the interface of the coating layer to form a fixing part; a sleeve is fitted onto the bare fiber bundle to remove the volatile liquid remaining on the bare fiber bundle; the sleeve and the bare fiber are fixed at the opening of the sleeve with low-bend adhesive; the sleeve and the bare fiber inside it are melt-tapered, and the fiber that passes through the center hole of the porous tube is the center fiber of the ring spot bundle combiner.

[0006] Optionally, to fix the optical fiber at a preset position near the interface of the coating layer to form a fixing part, UV-curable adhesive is applied to the optical fiber coating layer at a distance of 0.5-1 mm from the interface, and the UV-curable adhesive is cured using a UV curing lamp to form the fixing part.

[0007] Optionally, removing the residual volatile liquid on the bare fiber bundle includes removing the residual volatile liquid by using an air extraction device connected to the opening of the sleeve. The air extraction device includes an air extraction pipe and an air pump, with one end of the air extraction pipe connected to the air pump. The step of removing the residual volatile liquid from the fiber bundle includes: wrapping the opening of the sleeve with the air extraction pipe and using the air pump to extract air from the opening of the sleeve through the air extraction pipe. The negative pressure of the air pump is ≥0.095MPa, and the extraction time is ≥25min.

[0008] Optionally, the removal of the volatile liquid remaining on the bare fiber bundle further includes heating the sleeve using a negative ion fan during the process of the air extraction device removing the volatile liquid remaining on the bare fiber bundle.

[0009] Optionally, the wall of the sleeve is inspected until there is no water mist on the wall of the sleeve, at which point the removal of volatile liquid is completed.

[0010] Optionally, removing the residual volatile liquid on the bare fiber bundle further includes fixing the optical fiber to a clamping mechanism for removing the volatile liquid. The clamping mechanism includes a base, a track, a first carrier, and a second carrier. The first carrier and the second carrier are slidably mounted on the track provided on the base. The distance between the first carrier and the second carrier is adjusted so that the distance between them is less than the distance between the fixing part on the optical fiber and the sleeve. The fixing part on the optical fiber is fixed to the first carrier on the side near the sleeve. The sleeve is fixed to the second carrier, and the opening of the sleeve extends beyond the second carrier to connect with the vacuum device.

[0011] Optionally, the clamping mechanism further includes a microscope mechanism disposed on the base, the microscope mechanism being used to observe the wall of the sleeve.

[0012] Optionally, after the optical fiber is inserted into the porous tube, the interface between the coating layer of the optical fiber and the bare fiber is located inside the porous tube. After multiple bare fibers are gathered to form the bare fiber bundle, the porous tube moves to the coating layer of the optical fiber, and the fixing part is located between the porous tube and the bare fiber.

[0013] Optionally, the optical fibers with bare fibers are arranged in parallel along a first direction, which is perpendicular to the extension direction of the optical fibers. The interfaces between the coatings of all the optical fibers and the bare fibers are located in the same plane. The ends of the bare fibers are cut in a gradient so that the length of the bare fibers of each optical fiber increases sequentially, with a difference in the length increase of 0.8~1.2mm.

[0014] Optionally, the step of dripping volatile liquid onto the bare fiber to gather all the bare fibers into a bare fiber bundle includes positioning the bare fiber bundle in a vertically upward orientation and dripping the volatile liquid from the end of the bare fiber to gather all the bare fibers into the bare fiber bundle.

[0015] The process of fitting a sleeve onto the bare fiber bundle includes first positioning the bare fiber bundle vertically downwards, dripping volatile liquid from the side of the bare fiber bundle to smooth it, and then fitting the sleeve onto the bare fiber bundle from the end of the bundle.

[0016] The volatile liquid is analytical grade ethanol or isopropanol, and the amount added is 0.1-0.3%. .

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] By arranging optical fibers sequentially by length, making the length difference between adjacent bare fibers similar, multiple optical fibers are more easily clustered together, allowing volatile liquids to be fully absorbed by the fibers. This results in a longer period of fiber clustering and slows down solution evaporation. When the fiber coating is fixed and the fibers are pushed into the sleeve, the different lengths of the bare fibers create sharp points at the fiber tips, resulting in a smaller contact area between the fiber tips and the sleeve wall. This reduces friction between the fiber tips and the sleeve wall, and the sharp tips provide better guidance, making them less prone to bending and deformation when in contact with the sleeve wall. Furthermore, the fibers are less likely to bend due to inter-fiber interactions when passing through the sleeve. Using clean, highly volatile solutions such as analytical grade alcohol or isopropanol as lubricants to cluster the fibers reduces the resistance from the sleeve wall during fiber insertion, thus minimizing entanglement caused by fiber bending. Therefore, this method for processing annular spot bundlers can confirm the position of the central fiber before tube insertion, ensuring that the confirmed central fiber will not be misaligned after tapering. This saves operation time, reduces operation difficulty, increases the success rate and quality of annular spot bundlers or partial pump bundlers, and improves production efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for processing a ring-shaped bandgap combiner provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the optical fiber arrangement structure in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure after the optical fiber is fixed in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the arrangement structure between optical fibers in the cone cross-section of this invention.

[0024] Figure 5 This is a schematic diagram of the fixture in an embodiment of the present invention.

[0025] In the picture:

[0026] 1-Fiber optic cable, 2-Bare fiber, 3-Porous tube, 4-Fixing part, 5-Clamp, 51-Base, 52-Railway, 53-First carrier, 54-Second carrier, 55-Support, 56-Microscope, 6-Sleeve. Detailed Implementation

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] This invention provides a method for processing annular spot bundlers, addressing the technical problem of low efficiency in confirming the position of the central fiber after melt tapering. The method for processing annular spot bundlers is as follows: Figure 1 As shown, it includes:

[0032] like Figure 2 As shown, a predetermined number of fiber 1 fibers are formed by removing a section of coating from their ends to create bare fibers 2. The length of the bare fibers 2 of each fiber 1 increases sequentially.

[0033] like Figure 3-4 As shown, the optical fiber 1 with the bare fiber 2 at its midpoint length is inserted into the center hole of a porous tube 3 with a predetermined number of holes, i.e. Figure 2-4 As shown, in one embodiment of this invention, there are seven optical fibers 1. The fourth optical fiber 1, arranged according to its bare fiber length, is inserted into the central hole of the porous tube 3. The number of holes in the porous tube 3 is equal to the number of optical fibers 1. The remaining optical fibers 1 are then inserted into the remaining holes of the porous tube 3. When the preset number of optical fibers 1 is even, the number of central holes in the porous tube 3 is two. The interface between the coating layer of all optical fibers 1 and the bare fiber 2 is in the same plane. The optical fibers 1 located on both sides of the diameter direction of the central hole have different bare fiber lengths. One of them has a shorter bare fiber 2 length than the optical fiber 1 located in the central hole, and the other has a longer bare fiber 2 length than the optical fiber 1 located in the central hole. The shortest bare fiber 1, the longest bare fiber 1, and the optical fiber 1 in the central hole of the porous tube 3 are located in the same radial direction of the porous tube 3.

[0034] like Figure 3As shown, a volatile liquid is dripped onto the bare fiber 2 to gather all the bare fibers 2 of the optical fiber 1 into a bare fiber bundle. The optical fiber 1 is fixed at a preset position near the interface of the coating layer to form a fixing part 4, that is, the fixing part 4 is located in the coating layer of the optical fiber 1. The fixing method can be glue bonding, tape bonding, etc. The parts of multiple optical fibers 1 near the bare fiber 2 are fixed together to reduce the separation of the bundled bare fiber 2 caused by the movement of the optical fiber 1. A volatile solution is used to facilitate the removal of the bare fiber 2 after it is inserted into the sleeve 6. At the same time, the volatile solution can also reduce the friction between the bare fiber 2 and the sleeve 6, reduce the resistance encountered by the bare fiber 2 during the insertion process, and reduce the bending of the bare fiber 2. When dripping the volatile liquid onto the bare fiber 2, it is dripped from above the bare fiber 2 so that the volatile liquid can move along the bare fiber 2 towards the coating layer after being dripped, reducing the waste of volatile liquid.

[0035] like Figure 4 As shown, prepare a sleeve 6 with an inner diameter matching the outer diameter of the fiber bundle 1. The error between the inner diameter of the sleeve 6 and the outer diameter of the bare fiber bundle should be less than 2 μm. Insert the sleeve 6 vertically into the bare fiber bundle that has already been dripped together. During this process, the bare fiber bundle should not be shaken to reduce the possibility of it spreading out. If the bare fiber bundle spreads out, the bare fiber 2 portion needs to be re-dripped and gathered using a volatile liquid before being passed through the sleeve 6. The arrangement of the bare fiber 2 in step two can minimize the length difference between adjacent bare fibers 2, forming a gradient that makes it easier for the liquid to drip completely. The bare fiber 2 is gathered and held together for a longer time, reducing the evaporation of volatile liquids. The cross-sectional area of ​​the bare fiber bundle gradually decreases from the end away from the coating layer to the end closer to the coating layer. When the bare fiber bundle is inserted into the sleeve 6, the end with the smaller cross-sectional area is inserted into the sleeve 6 first. The end with the smaller cross-sectional area has better guidance, a smaller contact area with the sleeve 6, and lower friction with the sleeve 6 wall. It is less prone to bending and deformation when in contact with the inner wall of the sleeve 6, and can pass through the sleeve 6 more easily, reducing the bending of the bare fiber 2.

[0036] The opening of the sleeve 6 is sealed with low-refractive-index adhesive. Finally, the sleeve 6 and the bare fiber 2 inside it are tapered. The fiber 1 inserted into the central hole of the porous tube 3 is the central fiber of the ring spot combiner. The low-refractive-index adhesive is a low-refractive-index UV-curable adhesive with a refractive index n < 1.4. The low-refractive-index adhesive is used to reduce the reflection loss of the optical signal at the opening interface of the sleeve 6. After tapering, the fiber 1 is verified by passing light through it with an end-face inspection instrument. Verification can be done using a corresponding microscope or other end-face inspection instrument. When the diameter of the tapered fiber 1 is greater than 50 μm and the diameter of the fiber pole is less than or equal to 50 μm, the friction of the sleeve 6 wall and the thermal stress during the tapering process have a significant impact on the bending deformation of the fiber 1, which can easily lead to an increase in the number of abnormal cross-sections of the cone.

[0037] An optional implementation method of this embodiment is as follows: Figure 3As shown, the optical fiber 1 is fixed at a preset position near the interface of the coating layer to form the fixing part 4. UV-curable adhesive is applied to the coating layer of the optical fiber 1 at a distance of 0.5-1mm from the interface, and the UV-curable adhesive is cured with a UV-curing lamp to form the fixing part. The UV-curable adhesive is cured with a UV lamp to fix multiple optical fibers 1 neatly, reducing the movement and separation of multiple bare fibers 2 when the coating layer of the optical fiber 1 moves. The amount of adhesive added only needs to be enough to bond each coating layer. The UV-curable adhesive can also be a low-fold adhesive.

[0038] An optional implementation of this embodiment is as follows: Removing residual volatile liquid from the bare fiber bundle includes using an air extraction device connected to the opening of the sleeve 6 to remove the residual volatile liquid. The air extraction device includes an air extraction pipe and an air pump. The step of using the air extraction device to remove the residual volatile liquid includes wrapping the air extraction pipe around the sleeve 6 and inserting it into the opening, pressing down on the wall of the sleeve 6 to reduce the rotation of the sleeve 6, and then using the air pump to extract air from the opening of the sleeve 6 through the air extraction pipe. The air extraction pipe removes the residual volatile liquid through vacuum extraction. The extraction can absorb the evaporated solution. At the same time, the extraction accelerates the air flow rate on the bare fiber bundle, further accelerating the evaporation of the volatile liquid. The negative pressure of the air pump is ≥0.095MPa, and the extraction time is greater than 25min. The negative pressure of the air pump can be set according to specific circumstances, and the extraction time can be set according to the evaporation of the volatile liquid. The extraction time can be extended until the volatile liquid is removed.

[0039] An optional implementation of this embodiment is as follows: The step of removing the residual volatile liquid from the optical fiber bundle 1 further includes heating the sleeve 6 with a hot air blower. Heating can be done by heating the entire sleeve 6 with a negative ion blower. Heating can increase the temperature of the volatile liquid and accelerate the evaporation of the volatile liquid, so that the volatile liquid in the sleeve 6 can evaporate completely more quickly.

[0040] An optional implementation method of this embodiment is as follows: In order to reduce the influence of volatile liquid on the melt taper of bare fiber 2, before melt tapering, it is necessary to check whether water mist will form inside the tube wall of sleeve 6. If water mist is formed, it is necessary to continue to remove volatile liquid, such as by extending the evacuation time or extending the heating time of sleeve 6. When it is found that no water mist appears on the tube wall of sleeve 6, the evacuation tube is disconnected, heating is stopped, and the removal of volatile liquid is completed.

[0041] An optional implementation method of this embodiment is as follows: Figure 5As shown, removing residual volatile liquid from the bare fiber bundle also includes fixing the optical fiber 1 to the clamp mechanism 5 for removing the volatile liquid. The clamp mechanism 5 includes a base 51, a track 52, a first carrier 53, and a second carrier 54. The track 52 is mounted on the base 51, and the first carrier 53 and the second carrier 54 are slidably mounted on the track 52. The first carrier 53 and the second carrier 54 slide along the track 52 to adjust the distance between the first carrier 53 and the second carrier 54. The first carrier 53 and the second carrier 54 are used to fix the optical fiber 1 to facilitate the fixing of the optical fiber 1. Then, the photovolatile solution is removed or the state of optical fiber 1 is observed; specifically, the steps of fixing optical fiber 1 using clamp 5 include: sliding the first carrier 53 and the second carrier 54, adjusting the distance between the first carrier 53 and the second carrier 54 so that the distance between the first carrier 53 and the second carrier 54 is less than the distance between the sleeve 6 and the UV curing adhesive dot, so that the vacuum device can cover the opening of the sleeve 6 to remove the volatile liquid, fixing the first carrier 53 and the second carrier 54, and placing the bundle of optical fibers 1 inserted into the sleeve 6 on the second carrier 54 to determine the position of optical fiber 1. Next, place the coating layer of optical fiber 1 onto the first carrier 53 and fix it. The point where the UV-cured adhesive is applied to optical fiber 1 is about 1 cm away from the end of the first carrier 53 that is furthest from the second carrier 54. Fix the coating layer of optical fiber 1 at the end of the first carrier 53 that is furthest from the second carrier 54 using tape or other methods to temporarily fix the entire bundle of optical fibers 1 and reduce the rotation of optical fibers 1. To improve the fixing effect, the optical fibers 1 can be repeatedly fixed with tape. After the optical fibers 1 are fixed on the first carrier 53, fix the sleeve 6 to the second carrier 54 using tape or other methods. When pasting, the sleeve 6... The second carrier 54 protrudes about 0.5-1cm away from the first carrier 53. To prevent the optical fiber 1 from rotating, the tape can be applied again for fixation. When applying the tape to fix the optical fiber 1, press down on the sleeve 6 to prevent the sleeve 6 from rotating. This ensures that the tape is applied near the air extraction stress point of the sleeve 6, reducing the rotation of the sleeve 6. The inner diameter of the sleeve 6 is determined by etching the optical fiber 1. That is, before tapering the optical fiber 1, hydrofluoric acid is used to etch the optical fiber 1. The etched optical fiber 1 and the optical fiber 1 that needs to be tapered are of the same specification. The required inner diameter of the sleeve 6 is obtained by measuring the size of the etched optical fiber 1.

[0042] An optional implementation of this embodiment is as follows: The clamp 5 mechanism further includes a microscope mechanism disposed on the base 51. The microscope mechanism includes a bracket 55 and a microscope 56. The bracket 55 is mounted on the base 51 and located on one side of the track 52. The microscope 56 is mounted on the bracket 55. The bracket 55 is used to support the microscope 56. The microscope 56 is used to observe the tube wall of the sleeve 6. When checking the removal of volatile liquid from the bare fiber 2, the microscope 56 is used to determine whether to continue removing the volatile liquid from the bare fiber 2 by observing whether there is water mist penetrating the tube wall of the sleeve 6. The microscope used to verify the light transmission of the fiber 1 after tapering can be the microscope used to observe the tube wall of the sleeve.

[0043] An optional implementation of this embodiment is as follows: After the optical fiber 1 is inserted into the porous tube 3, the interface between the coating layer of the optical fiber 1 and the bare fiber 2 is located inside the porous tube 3. That is, part of the bare fiber 2 of the optical fiber 1 is located inside the porous tube 3, and part of the coating layer is located inside the porous tube 3. In this way, the position of the bare fiber 2 can be brought closer together through the porous tube 3, so that the bare fiber 2 can be gathered when volatile liquid is added. After the bare fiber 2 is gathered to form a bare fiber bundle, the porous tube 3 is moved to the coating layer of the optical fiber 1, reducing the influence of the porous tube 3 on the gathering of the optical fiber 1. At this time, the porous tube 3 fixes the position of the optical fiber 1, reducing the displacement of the optical fiber 1. The position of the porous tube 3 needs to leave space for the fixing part to fix the optical fiber 1. That is, the fixing part is located between the porous tube 3 and the bare fiber 2, so as to facilitate the application of UV-curing adhesive at a distance of 0.5-1mm from the bare fiber to the coating layer of the optical fiber 1.

[0044] An optional implementation of this embodiment is as follows: the optical fibers 1 on which bare fibers 2 are formed are arranged parallel to each other along a first direction, the first direction being perpendicular to the extension direction of the optical fibers 1, such as... Figure 2 As shown, in one embodiment of this invention, the first direction is parallel to the x-axis. The interface between the coating layer of the optical fiber 1 and the bare fiber 2 is in the same plane position, so as to facilitate the comparison of the length of the bare fiber 2. The ends of the bare fiber 2 are cut in a gradient so that the length of the bare fiber 2 of each optical fiber increases sequentially. The difference in the length of the bare fiber 2 is 0.8~1.2mm, and preferably the difference in the length of the bare fiber 2 is 1mm.

[0045] An optional implementation of this embodiment is as follows: Dropping volatile liquid onto the bare fiber 2 to gather all the bare fibers 2 of the optical fiber 1 into a bare fiber bundle includes: positioning the bare fiber bundle vertically upwards; dropping volatile liquid from the end of the bare fiber 2 to gather all the bare fibers 2 of the optical fiber 1 into a bare fiber bundle; the volatile liquid moves from the end of the bare fiber 2 towards the end closer to the coating layer under the action of gravity, thereby gathering multiple bare fibers 2; installing the sleeve 6 on the bare fiber bundle includes: first positioning the bare fiber bundle vertically downwards; the downward orientation of the bare fiber bundle allows the bare fibers 2 to move towards the center under the gathering effect of the volatile liquid, reducing the outward dispersion of the bare fibers 2 under gravity caused by the upward orientation of the bare fiber bundle; dripping volatile liquid from the side of the bare fiber bundle to smooth the bare fiber bundle; and finally, applying volatile liquid to the coating layer of the optical fiber 1. During fixation, some bare fibers 2 may move, causing partial separation or reduced aggregation. Rinsing the sides of the bare fibers 2 with a volatile liquid can improve aggregation. Then, the sleeve 6 is fitted onto the bare fiber bundle from the end. While inserting the sleeve 6, continuous pressure can be applied at the fixing point to reduce movement. The empty sleeve 6 is then vertically inserted into the already bundled optical fibers 1, without any movement, to prevent the bundle from unraveling. If the bundle unravels, the bare fiber 2 portion needs to be rinsed and smoothed again with the volatile liquid before being passed through the sleeve 6 again. The volatile liquid is analytical grade alcohol or isopropanol, with an addition volume of 0.1-0.3%. .

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for processing a ring-shaped bandgap combiner, characterized in that, include: A predetermined number of fiber ends are coated with a length of material to form bare fibers, with the length of the bare fibers of each fiber increasing sequentially. The optical fibers forming the bare fibers are arranged in parallel along a first direction, which is perpendicular to the extension direction of the optical fibers. The interfaces between the coatings of all the optical fibers and the bare fibers are located in the same plane. The ends of the bare fibers are cut in a gradient so that the length of the bare fibers of each optical fiber increases sequentially, with a difference in length increase of 0.8~1.2mm. The optical fiber with the bare fiber length at the middle position is inserted into the center hole of a porous tube with a predetermined number of holes. Then, the remaining optical fibers are inserted into the remaining holes of the porous tube. The interface between the coating layer of all optical fibers and the bare fiber is in the same plane. Among the optical fibers located on both sides of the diameter direction of the center hole, one has a shorter bare fiber length than the optical fiber in the center hole, and the other has a longer bare fiber length than the optical fiber in the center hole. A volatile liquid is dropped onto the bare fiber to gather all the bare fibers into a bare fiber bundle, and the optical fiber is fixed at a predetermined position near the interface of the coating layer to form a fixing part; A sleeve is fitted onto the bare fiber bundle to remove the volatile liquid remaining on the bare fiber bundle; The sleeve and the bare fiber are fixed at the opening of the sleeve with low-bend adhesive. The sleeve and the bare fiber inside it are melt-tapered. The optical fiber that passes through the central hole of the porous tube is the central fiber of the ring spot combiner. Removing the volatile liquid remaining on the bare fiber bundle further includes fixing the optical fiber to a clamping mechanism for removing the volatile liquid. The clamping mechanism includes a base, a track, a first carrier, and a second carrier. The first carrier and the second carrier are slidably mounted on the track provided on the base. The distance between the first carrier and the second carrier is adjusted so that the distance between them is less than the distance between the fixing part on the optical fiber and the sleeve. The fixing part on the optical fiber is fixed to the first carrier at the position near the sleeve. The sleeve is fixed to the second carrier, and the opening of the sleeve extends beyond the second carrier to connect with the air extraction device. After the optical fiber is inserted into the porous tube, the interface between the coating layer of the optical fiber and the bare fiber is located inside the porous tube. After multiple bare fibers are gathered to form the bare fiber bundle, the porous tube moves to the coating layer of the optical fiber, and the fixing part is located between the porous tube and the bare fiber.

2. The method for processing a ring-shaped bandgap combiner according to claim 1, characterized in that, The step of fixing the optical fiber at a preset position near the interface of the coating layer to form a fixing part involves applying UV-curable adhesive to the optical fiber coating layer at a distance of 0.5-1 mm from the interface, and using a UV curing lamp to cure the UV-curable adhesive to form the fixing part.

3. The method for processing a ring-shaped bandgap combiner according to claim 1, characterized in that, The removal of residual volatile liquid from the bare fiber bundle includes using an air extraction device connected to the opening of the sleeve to remove the residual volatile liquid. The air extraction device includes an air extraction pipe and an air pump, with one end of the air extraction pipe connected to the air pump. The step of removing residual volatile liquid from the fiber bundle includes: using the air extraction pipe to cover the opening of the sleeve, and using the air pump to extract air from the opening of the sleeve through the air extraction pipe. The negative pressure of the air pump is ≥0.095MPa, and the extraction time is ≥25min.

4. The method for processing a ring-shaped bandgap combiner according to claim 3, characterized in that, The removal of the volatile liquid remaining on the bare fiber bundle also includes heating the sleeve using a negative ion fan during the process of the air extraction device removing the volatile liquid remaining on the bare fiber bundle.

5. The method for processing a ring-shaped bandgap combiner according to claim 3, characterized in that, Inspect the wall of the sleeve until there is no water mist on the wall of the sleeve, then the removal of volatile liquid is complete.

6. The method for processing a ring-shaped bandgap combiner according to claim 1, characterized in that, The clamping mechanism also includes a microscope mechanism disposed on the base, the microscope mechanism being used to observe the tube wall of the sleeve.

7. The method for processing a ring-shaped bandgap combiner according to claim 1, characterized in that, The process of dripping a volatile liquid onto bare fibers to gather all the bare fibers into a bare fiber bundle includes positioning the bare fiber bundle vertically upwards and dripping the volatile liquid from the end of the bare fibers to gather all the bare fibers into the bare fiber bundle. The process of fitting a sleeve onto the bare fiber bundle includes first positioning the bare fiber bundle vertically downwards, dripping volatile liquid from the side of the bare fiber bundle to smooth it, and then fitting the sleeve onto the bare fiber bundle from the end of the bundle. The volatile liquid is analytical grade ethanol or isopropanol, and the amount added is 0.1-0.3%. .

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