Multi-component glass optical fiber hot melting bundling process and device

Abstract

The invention discloses a multi-component glass optical fiber hot melting bundling process and device, and relates to the technical field of optical fiber manufacturing, and the process comprises the following steps: S1, respectively carrying out hot melting earlier stage processing on a glass tube and an optical fiber; s2, carrying out tool assembly on the glass tube and the optical fiber; s3, performing hot melting bundling on the glass tube and the optical fiber; according to the method, high-precision uniform distribution of the optical fibers is achieved, the defect rate is reduced, trace gas escapes while air in the furnace is removed, the bubble residual rate is reduced, and the long-term use reliability of the glass optical fibers is improved; the hot melting temperature requirements of different multi-component glass optical fibers are met, and the characteristic difference of the optical fibers with different components is considered; temperature, time and pressure parameters are combined, so that the transmittance of the combined optical fiber is improved, and the tensile strength is also remarkably enhanced; and through segmented cooling, the cracking risk is reduced, and the process stability is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of optical fiber manufacturing technology, specifically to a process and apparatus for thermally fusion bonding of multi-component glass optical fibers. Background Technology

[0002] Multi-component glass fibers, containing various oxides (such as boron oxide and lead bismuth oxide), possess unique characteristics such as tunable refractive index and special spectral response, making them highly promising for applications in fields like industrial lasers and medical sensing fibers. However, a single fiber is insufficient to meet the demands of complex systems, necessitating the use of fiber-bonding technologies to expand their application scope. Existing thermal fusion bonding technologies have the following shortcomings: 1. Insufficient precision in fiber splitting and uniform distribution leads to uneven heating during hot melting, resulting in defects such as bubbles and cracks.

[0003] 2. The control of parameters such as temperature, time, and pressure during the hot-melting process lacks systematicity, making it difficult to take into account the differences in characteristics of different fiber components. The optical transmittance and mechanical strength after bundling need to be improved.

[0004] 3. Poor process stability makes it impossible to effectively solve the internal stress problem caused by the difference in thermal expansion coefficients of multi-component optical fibers, affecting long-term reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-component glass fiber thermal fusion bundling process and apparatus to address the problems mentioned in the background art, such as insufficient fiber splitting and uniform distribution accuracy, resulting in uneven heating during thermal fusion and defects such as bubbles and cracks; lack of systematic control over parameters such as temperature, time, and pressure during thermal fusion, making it difficult to take into account the differences in characteristics of different fiber components; insufficient optical transmittance and mechanical strength after bundling; poor process stability; and inability to effectively solve the internal stress problem caused by the difference in thermal expansion coefficients of multi-component fibers, thus affecting long-term reliability.

[0006] To address the aforementioned technical problems, this invention provides the following technical solution: a multi-component glass fiber thermal fusion bundling process, the details of which are as follows: S1, Perform pre-heat fusion treatment on both the glass tube and the optical fiber: The optical fiber is cut into strands using a cutting tool; The split optical fibers are cleaned and arranged. Spray a release agent onto the inner surface of the glass tube; Bake the glass tube after spraying the release agent; S2, Tooling assembly of the glass tube and optical fiber: The baked glass tube in S1 and the fiber optic cable after splitting and arranging are sequentially loaded into the fiber optic fusion splice fixture. S3, heat fusion of the glass tube and the optical fiber: Put the clamped glass tube and the lower end of the optical fiber in the tube furnace, and start the vacuum pump to pump out the gas in the tube furnace to generate negative pressure in the tube furnace; Heat the tube furnace to soften the glass tube, so that the optical fiber and the glass tube are preliminarily fused to obtain a glass optical fiber assembly; Stop heating and naturally cool down for 5 minutes to release the stress of the glass tube; turn off the power of the tube furnace and take out the glass optical fiber assembly after naturally cooling down to room temperature; Cut the excess part of the glass optical fiber assembly after preliminary fusion and cooling, and inspect the end face of the cut glass optical fiber assembly; S4, post-processing of the heat-fused glass optical fiber.

[0007] In a preferred embodiment: in the S1, the cutting tool is a cutting knife, the optical fiber is separated by a fiber separator, the cleaning liquid used is alcohol, and the arrangement is performed by using a tooth comb to arrange the cleaned optical fiber.

[0008] In a preferred embodiment: the glass tube after spraying the release agent is baked in a muffle furnace, the temperature in the muffle furnace is 600°C, the time is 6 hours, and the release agent is an inorganic release agent, including nano-alumina sol or boron nitride suspension.

[0009] In a preferred embodiment: the sequential loading in the S2 is to first load the sealed tube into the optical fiber fusion clamp, then insert the separated and arranged optical fiber into the sealed tube, and finally load the lower end of the optical fiber into the baked glass tube, adjust the position of the optical fiber in the glass tube through the optical fiber fusion clamp to form a coaxial center.

[0010] In a preferred embodiment: the negative pressure in the tube furnace is pumped to 0.077 Pa-0.085 Pa, the tube furnace is heated at a rate of 70°C / min to 720°C, and kept for 15 minutes, the natural cooling temperature is 200°C, then the glass optical fiber assembly is cooled to room temperature and kept at room temperature for five minutes, the cutting tool is a cutting machine, and the inspection method is to observe the bubbles, cracks and concentricity of the cut end face of the glass optical fiber assembly by using a microscope.

[0011] In a preferred embodiment: the post-processing method is to put the glass optical fiber assembly after inspection in the S3 into a three-waveband heating furnace for 10 hours, and then cool down and polish the cut end face of the glass optical fiber assembly by using a grinding and polishing machine.

[0012] A multi-component glass fiber thermal fusion bundling device includes, The fiber splitting and distribution module is used for fiber splitting and distribution adjustment. The fiber splitting and distribution module includes a fiber splitter, a toothed comb, and a microscope. A glass tube pretreatment module for spraying and baking glass tubes, the glass tube pretreatment module including a release agent spraying machine and a muffle furnace; The hot-melt processing module is used to control the heating, heat preservation and cooling under negative pressure environment, thereby completing the bundling of glass tube and optical fiber; And a post-processing module for grinding and polishing glass fiber assemblies, the post-processing module including a three-band heating furnace and a grinding and polishing machine.

[0013] In a preferred embodiment: the hot-melt processing module includes a support plate, an optical fiber splicing fixture, and a tubular furnace heating mechanism. The tubular furnace heating mechanism includes a tubular furnace, a fixed bracket, heating wire output ends, a thermocouple bracket, a cavity, a vacuum pump, a sealing plug, and a tubular furnace temperature control. Two heating wire output ends are installed on one side wall of the tubular furnace, and the two heating wire output ends are symmetrically distributed along the axis of the tubular furnace. The cavity is located at the center of the tubular furnace. Symmetrically distributed insertion interfaces are provided on both end walls of the tubular furnace corresponding to the cavity. An optical fiber splicing fixture is provided above the tubular furnace. The vacuum pump is located on one side of the tubular furnace. A tubular furnace temperature control is also provided at the upper end of the support plate. The sealing plug is located inside the tubular furnace. One side of the fixed bracket is fixedly installed on the outer wall of the tubular furnace, and the other side is installed on the side of the support plate. The bottom of the tubular furnace is placed on the support plate. A thermocouple bracket is installed on the side wall of the tubular furnace away from the heating wire output ends.

[0014] In a preferred embodiment: a thermocouple is installed inside the thermocouple bracket, and the end of the thermocouple away from the thermocouple bracket is located inside the tubular furnace. The tubular furnace temperature control is a tubular furnace temperature control box, which is fixedly installed on the support plate. The tubular furnace temperature control box is connected to the heating wire output end via a wired connection.

[0015] In a preferred embodiment: a plurality of temperature control buttons are arranged on the tubular furnace temperature control box, the plurality of temperature control buttons are electrically connected with the controller of the tubular furnace temperature control box through wires, the tubular furnace is connected with the vacuum pump for extracting the gas in the tubular furnace through a sealing pipe, the sealing plug comprises a plug core arranged in the cavity and a sealing ring, the plug core is provided with the sealing ring at both ends, the plug core is arranged below the sealing pipe, the lower end of the sealing pipe is inserted into the plug-in interface arranged at the upper end of the tubular furnace, and the filament separator comprises a first pipe opening, a second pipe opening and a third pipe opening, the diameters of the second pipe opening and the third pipe opening are the same, and the diameters of the second pipe opening and the third pipe opening are smaller than that of the first pipe opening.

[0016] Compared with the prior art, the present application has the following beneficial effects: Through the cooperation of the tooth comb and the microscope observation, the spacing between the optical fibers can be controlled, the high-precision uniform distribution of the optical fibers is realized, the heating uniformity during hot melting is ensured, the defect rate is reduced, in the negative pressure environment, the air in the furnace is excluded, at the same time, the trace gas generated in the hot melting process can be discharged, the glass tube softening in the heating process is cooperated, the bubble residual rate is reduced, and the optical transmittance and mechanical strength of the glass optical fiber after hot fusion of the glass optical fiber are increased, the long-term use reliability of the glass optical fiber is increased, the temperature control strategy of 70 DEG C / min heating rate to 720 DEG C for 15 minutes is adopted, the molecular diffusion of the optical fiber and the glass tube is promoted, the interface fusion quality between the optical fiber and the glass tube is improved, the thermocouple in the thermocouple support can monitor the temperature in the furnace body in real time, so that the temperature can be adjusted to meet the hot melting temperature requirement of different multi-component glass optical fibers in cooperation with the setting of the tubular furnace temperature control box, and the characteristic differences of different component optical fibers are considered; the combination of temperature, time and pressure parameters can improve the transmittance of the fused optical fiber, which is greatly improved compared with the traditional process, and the tensile strength is also significantly enhanced; through segmented cooling, the stress in the glass tube is effectively released, the risk of cracking is reduced, and the process stability is greatly increased. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, which together with the embodiments of the application are used to explain the application, and do not constitute a limitation on the application. In the drawings: Figure 1 It is a multi-component glass optical fiber hot fusion process flowchart of the present application; Figure 2 It is a whole structure schematic diagram of the multi-component glass optical fiber hot fusion device of the present application; Figure 3 It is a structure schematic diagram of the tubular furnace heating mechanism of the present application; Figure 4 It is a sectional structure bottom view schematic diagram of the tubular furnace heating mechanism of the present application; Figure 5It is a schematic diagram of the sealing plug structure of the present application. Figure 6 It is a schematic diagram of the tooth comb structure of the present application. Figure 7 It is a schematic diagram of the filament separator structure of the present application. Figure 8 It is a schematic diagram of the sectional structure of the filament separator of the present application. Figure 9 It is a comparison chart of experimental parameters of the present application. In the figure: 1, filament separator; 2, tooth comb; 3, optical fiber fusion clamp; 4, tubular furnace heating mechanism; 40, tubular furnace; 41, fixed support; 42, heating wire output end; 43, thermocouple support; 44, cavity; 5, vacuum pump; 6, tubular furnace temperature control box; 7, plug-in port; 8, bearing plate; 9, sealing tube; 10, first tube opening; 11, second tube opening; 12, third tube opening; 13, plug core; 14, sealing ring. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0019] Please refer to Figure 1 and Figure 9 The present application provides a technical solution: a multi-component glass optical fiber hot fusion beam process, and the specific content is as follows: S1, heat the glass tube and the optical fiber respectively for pre-treatment before hot fusion: After cutting the optical fiber using a cutting tool, the optical fiber is separated; The cutting tool is a cutting knife, and the optical fiber is separated using a filament separator 1, inserted into the first tube opening 10 of the filament separator 1, and pulled out from the third tube opening 12; The separated optical fiber is cleaned and arranged; The cleaning liquid used for cleaning the separated optical fiber is alcohol, and the arrangement is performed by arranging the cleaned optical fiber using a tooth comb 2 to avoid overlapping of the optical fiber, and then observing the uniform distribution effect of the optical fiber under a microscope. The distance between the optical fibers can be controlled to be ≤5μm through the cooperation of the tooth comb 2 and the microscope, which is 4-6 times higher than the uniform distribution precision of 20-30μm in the traditional process, realizes high-precision uniform distribution of the optical fiber, ensures uniform heating during hot fusion, and reduces the defect rate; The inner wall surface of the glass tube is sprayed with a release agent to ensure that the optical fiber and the glass tube can be easily separated after hot fusion; The glass tube after spraying the release agent is placed in a muffle furnace for baking; The temperature of the muffle oven is 600℃, and the time is 6 hours, which can further remove moisture and organic residues. The release agent forms a non-carbon-based isolation layer after being baked at 600℃, which plays an isolation role between the glass tube and the glass fiber, facilitating subsequent demolding. The release agent uses a high-temperature-resistant inorganic release agent, including nano-alumina sol or boron nitride suspension; S2, the glass tube and the optical fiber are assembled in the optical fiber fusion clamp 3 in order; The glass tube baked in S1 and the optical fiber arranged in the glass tube are sequentially loaded into the optical fiber fusion clamp 3; The sealing tube 9 is loaded into the optical fiber fusion clamp 3, and then the optical fiber arranged in the glass tube is inserted into the sealing tube 9. Finally, the lower end of the optical fiber is loaded into the baked glass tube. The position of the optical fiber in the glass tube is adjusted by the optical fiber fusion clamp 3 to form a coaxial center. The optical fiber fusion clamp 3 can ensure that the coaxiality deviation of the optical fiber and the glass tube is ≤0.01mm, so that the eccentric loss of the light beam transmission is reduced to below 0.1dB, which is greatly optimized compared with the traditional manual assembly of 0.5-1dB loss; S3, the glass tube and the optical fiber are heated and fused; The clamped glass tube and the lower end of the optical fiber in S2 are placed in the tube furnace 40, and the vacuum pump 5 is started to exhaust the gas in the tube furnace 40 to exclude air in the furnace to prevent oxidation. The tube furnace 40 generates negative pressure, and the negative pressure in the tube furnace 40 is 0.077Pa-0.085Pa. Under the negative pressure environment of 0.077Pa-0.085Pa, the trace gas generated during the heat fusion process can escape while the air in the furnace is excluded. Combined with the softening of the glass tube during the heating process, the bubble residual rate is reduced from 15-20% in the traditional process to below 3%; After the gas is extracted, the glass tube is softened by heating in the tube furnace 40. The heating mode of the tube furnace 40 is to heat to 720℃ at a rate of 70℃ / min and keep for 15 minutes, so that the optical fiber and the glass tube are preliminarily fused to obtain a glass optical fiber assembly. The temperature control strategy of heating to 720℃ at a rate of 70℃ / min and keeping for 15 minutes can promote the molecular diffusion of the optical fiber and the glass tube and improve the interface fusion quality; Stop heating and naturally cool to 200℃, keep for 5 minutes to release the stress of the glass tube; turn off the power of the tube furnace 40, and take out the glass optical fiber assembly after natural cooling to room temperature. By subcooling (first to 200℃ for 5 minutes, and then to room temperature), the stress in the glass tube can be effectively released, and the risk of cracking is reduced; In the above process, by combining the temperature (720℃), time (heating rate 70℃ / min, keeping for 15 minutes, cooling to 200℃ and keeping for 5 minutes), and pressure (negative pressure 0.077Pa-0.085Pa) parameters, the transmission rate of the fused optical fiber is improved to ≥72%, which is more than 10% higher than that in the traditional process, and the tensile strength is significantly enhanced. After initial fusion and cooling, the glass fiber assembly is cut. The excess part of the glass fiber assembly is cut off with a cutting tool, which is a cutting machine. The end face of the cut glass fiber assembly is inspected by using a microscope to observe bubbles, cracks and concentricity on the cut end face of the glass fiber assembly to ensure the quality of fusion splicing. S4 is a post-processing step for the glass optical fiber after thermal fusion bundling.

[0020] The post-processing method involves placing the glass fiber assembly, after inspection in S3, into a three-band heating furnace for baking for 10 hours. After baking, the assembly is cooled and the cut end face of the glass fiber assembly is ground and polished using a grinding and polishing machine.

[0021] Multi-component glass optical fibers containing lead bismuth oxide were selected and cut to a length of 50 mm. Single fibers were separated using a fiber splitter 1, and the fiber surface was wiped with alcohol. The fibers were then combed using a toothed comb 2, arranged clockwise, and adjusted under a microscope until the fiber spacing was ≤5 μm. A release agent was sprayed onto a glass tube with an inner diameter of 1 mm to ensure easy separation of the fiber from the glass tube after heat fusion. The glass tube was then placed in a muffle furnace and baked at 600℃ for 6 hours to remove moisture and organic residue. During assembly, the optical fiber was inserted vertically into the glass tube, ensuring that the coaxiality deviation between the fiber and the glass tube was ≤0.01 mm. The lower ends of the glass tube and the optical fiber were then inserted into a tube furnace 40. A vacuum pump 5 was started to reduce the negative pressure inside the tube furnace 40 to 0.08 Pa, and the temperature was increased to 720℃ at a rate of 70℃ / min. The glass fiber assembly was kept at a high temperature for 15 minutes, then the negative pressure was turned off, and it was allowed to cool naturally to 200°C. This temperature was maintained for 5 minutes, and then cooled to room temperature before being removed. The fused glass fiber assembly was then placed in a three-band heating furnace and baked for 10 hours at temperatures of 300°C, 500°C, and 700°C. Afterward, it was ground and polished. Testing showed that the transmittance of the bundled glass fiber assembly reached 75%, a 10% improvement compared to the 65% of the traditional process; the tensile strength was 2.8 GPa, a 27% improvement compared to the 2.2 GPa of the traditional process; and the bubble defect rate was less than 3% using the proposed process, while the traditional process reached 15%. Furthermore, experimental results showed that the signal attenuation was ≤0.5 dB at a bending radius of 5 mm, with all indicators superior to the traditional process.

[0022] Please see Figures 2-8 The present invention provides a technical solution: a multi-component glass fiber thermal fusion bundling device, comprising, The fiber splitting and distribution module is used for fiber splitting and distribution adjustment. The fiber splitting and distribution module includes a fiber splitter 1, a toothed comb 2, and a microscope. The glass tube pretreatment module is used for spraying and baking glass tubes. The glass tube pretreatment module includes a release agent spraying machine and a muffle furnace. The hot melting processing module is used for realizing temperature rising, temperature keeping and temperature falling control in a negative pressure environment, so as to complete the beam combination of the glass tube and the optical fiber. The post-processing module is used for grinding and polishing the glass fiber assembly, and the post-processing module comprises a three-waveband heating furnace and a grinding and polishing machine.

[0023] The hot melting processing module comprises a bearing plate 8, an optical fiber fusion clamp 3 and a tube furnace heating mechanism 4. The tube furnace heating mechanism 4 comprises a tube furnace 40, a fixed support 41, an electric heating wire output end 42, a thermocouple support 43, a cavity 44, a vacuum pump 5, a sealing plug and a tube furnace temperature control device. Two electric heating wire output ends 42 are arranged on the side wall of the tube furnace 40 in a symmetrical distribution along the axis of the tube furnace 40. The electric heating wire output end 42 is used for supplying power to heat the tube furnace 40. The cavity 44 is arranged at the center position in the tube furnace 40. Symmetrical distribution plug-in interfaces 7 are arranged on the two end walls of the tube furnace 40 corresponding to the cavity 44. The optical fiber fusion clamp 3 is arranged above the tube furnace 40. The vacuum pump 5 is arranged on one side of the tube furnace 40. The tube furnace temperature control device is arranged on the upper end of the bearing plate 8. The sealing plug is arranged in the tube furnace 40. One side of the fixed support 41 is fixedly arranged on the outer wall of the tube furnace 40. The other side is arranged on the side of the bearing plate 8 through a fastening bolt. The bottom of the tube furnace 40 is arranged on the bearing plate 8. The fixed support 41 is used for fixing the tube furnace 40. The thermocouple support 43 is arranged on the side wall of the tube furnace 40 away from the electric heating wire output end 42. The thermocouple support 43 is used for fixing the thermocouple.

[0024] In use of the multi-component glass optical fiber hot fusion beam device, first, the upper end of the optical fiber is inserted into the sealed tube 9, the lower end of the optical fiber is in the cavity 44, then the glass tube is inserted into the lower end of the optical fiber through the insertion port 7 of the tube furnace 40, then the glass tube and the optical fiber are fixed and the concentricity is adjusted by the optical fiber fusion clamp 3, after the adjustment is completed, the vacuum pump 5 is started, the tube furnace 40 is pumped to a negative pressure state of 0.077 Pa-0.085 Pa, so as to reduce the influence of air on the hot fusion beam process, then the temperature control button on the tube furnace temperature control box 6 is set to the appropriate temperature, the heating wire in the tube furnace temperature control part control electric heating wire output end 42 starts to work, the tube furnace 40 is heated, the thermocouple can monitor the temperature in the tube furnace 40 in real time, so as to control the heating process by the tube furnace temperature control part, in the heating process, the multi-component glass optical fiber is completed under the condition of adjustable temperature and pressure, through the setting of the tube furnace heating mechanism 4, the vacuum pump 5 and the tube furnace temperature control part, the tube furnace 40 is in the negative pressure environment of 0.077 Pa-0.085 Pa and the temperature control of the tube furnace temperature control box 6, the air in the furnace is excluded at the same time, the glass tube is softened in cooperation with the heating process, the molecular diffusion of the optical fiber and the glass tube is promoted, the interface fusion quality is improved, the bubble residual rate is reduced, so as to increase the optical transmittance and mechanical strength of the glass optical fiber after hot fusion beam, increase the long-term use reliability of the glass optical fiber, the setting of the thermocouple in the thermocouple support 43 can monitor the temperature in the tube furnace 40 in real time, so as to adjust the temperature to meet the hot melting temperature requirement of different multi-component glass optical fibers in cooperation with the setting of the tube furnace temperature control box 6, taking into account the characteristic difference of different component optical fibers; The thermocouple in the thermocouple support 43 is provided in the tube furnace 40 away from the thermocouple support 43, for monitoring the temperature in the tube furnace 40, the tube furnace temperature control part is the tube furnace temperature control box 6, the tube furnace temperature control box 6 is fixedly installed on the bearing plate 8, the tube furnace temperature control box 6 and the electric heating wire output end 42 are connected by wired mode, the wired mode is preferably connected with the controller in the tube furnace temperature control box 6 by control bus, the tube furnace temperature control box 6 transmits operation instructions by control bus to control the operation of the electric heating wire output end 42.

[0025] A plurality of temperature control buttons are arranged on the tubular furnace temperature control box 6, and the plurality of temperature control buttons are electrically connected with the controller in the tubular furnace temperature control box 6 through wires. The plurality of temperature control buttons are arranged to facilitate the start and stop of the electric heating wire output end 42 through the tubular furnace temperature control box 6, so that the heating temperature of the tubular furnace 40 can be conveniently and flexibly adjusted according to needs. The tubular furnace 40 and the vacuum pump 5 for extracting the gas in the tubular furnace 40 are connected through the sealing pipe 9. The sealing plug comprises a plug core 13 arranged in the cavity 44 and a sealing ring 14. The plug core 13 is provided with the sealing ring 14 at both ends. The plug core 13 is arranged below the sealing pipe 9. The lower end of the sealing pipe 9 is inserted into the insertion port 7 at the upper end of the tubular furnace 40. The upper end of the optical fiber is inserted into the sealing pipe 9, and the lower end is inserted into the cavity 44. The glass tube is inserted into the cavity 44 from the insertion port 7 at the lower end of the tubular furnace 40. At this time, the glass tube is sleeved on the tail end of the optical fiber. Then, the plug core 13 is sleeved on the outside of the glass tube. When hot melting, the optical fiber is first heated to expand and fill the glass tube, thereby forming a sealed space. Then, the vacuum pump 5 is started to extract the gas in the tubular furnace 40, so that the negative pressure range in the tubular furnace 40 is maintained at 0.077 Pa-0.085 Pa. The filament separator 1 comprises a first pipe opening 10, a second pipe opening 11 and a third pipe opening 12. The diameters of the second pipe opening 11 and the third pipe opening 12 are the same, and the diameters of the second pipe opening 11 and the third pipe opening 12 are smaller than the diameter of the first pipe opening 10.

[0026] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A process for thermally fusing multi-component glass optical fibers, characterized in that: The content is as follows: S1, Perform pre-heat fusion treatment on both the glass tube and the optical fiber: The optical fiber is cut into strands using a cutting tool; The split optical fibers are cleaned and arranged. Spray a release agent onto the inner surface of the glass tube; Bake the glass tube after spraying the release agent; S2, Tooling assembly of the glass tube and optical fiber: The glass tube baked in S1 and the optical fiber after splitting and arranging are sequentially loaded into the optical fiber fusion splicing fixture (3); S3, thermally fuses the glass tube and optical fiber together: Place the glass tube and the lower end of the optical fiber clamped in S2 into the tube furnace (40), and start the vacuum pump (5) to extract the gas in the tube furnace (40), generating a negative pressure in the tube furnace (40). The glass tube is heated by a tube furnace (40) to soften it, so that the optical fiber and the glass tube are initially fused to obtain a glass optical fiber assembly. Stop heating, allow to cool naturally, and hold for 5 minutes to release the stress in the glass tube; turn off the power to the tube furnace (40), allow to cool naturally to room temperature, and then remove the glass fiber assembly; After initial fusion and cooling, the glass fiber assembly is cut. The excess part of the glass fiber assembly is cut off with a cutting tool, and the end face of the cut glass fiber assembly is inspected. S4 is a post-processing step for the glass optical fiber after thermal fusion bundling.

2. The multi-component glass fiber thermal fusion bundling process according to claim 1, characterized in that: In S1, the cutting tool is a cutting scissors, the fiber is split into fibers using a fiber splitter (1), the cleaning solution used for cleaning is alcohol, and the arrangement method is to arrange the cleaned fiber using a toothed comb (2).

3. The multi-component glass fiber thermal fusion bundling process according to claim 1, characterized in that: The method for baking the glass tube after spraying the release agent is to place the glass tube after spraying the release agent into a muffle furnace for baking. The baking temperature in the muffle furnace is 600°C and the time is 6 hours. The release agent is an inorganic release agent, including nano alumina sol or boron nitride suspension.

4. The multi-component glass fiber thermal fusion bundling process according to claim 1, characterized in that: The sequential loading method in S2 is as follows: first, the sealing tube (9) is loaded into the optical fiber fusion splicing fixture (3), then the fiber after the fiber filaments are arranged is inserted into the sealing tube (9), and finally the lower end of the fiber is loaded into the baked glass tube. The position of the fiber in the glass tube is adjusted by the optical fiber fusion splicing fixture (3) to form a coaxial structure.

5. The multi-component glass fiber thermal fusion bundling process according to claim 1, characterized in that: The negative pressure inside the tube furnace (40) is reduced to 0.077Pa-0.085Pa. The tube furnace (40) is heated to 720°C at a rate of 70°C / min and held for 15 minutes. The temperature of natural cooling is 200°C. The cutting tool is a cutting machine. The inspection method is to use a microscope to observe the bubbles, cracks and concentricity of the cut end face of the glass fiber assembly.

6. The multi-component glass fiber thermal fusion bundling process according to claim 1, characterized in that: The post-processing method involves placing the glass fiber assembly, after inspection in S3, into a three-band heating furnace for baking for 10 hours. After baking, the assembly is cooled and the cut end face of the glass fiber assembly is ground and polished using a grinding and polishing machine.

7. A multi-component glass fiber thermal fusion bonding device, wherein the device is applied to the multi-component glass fiber thermal fusion bonding process as described in any one of claims 1-6, characterized in that: include, The fiber splitting and distribution module is used for fiber splitting and distribution adjustment. The fiber splitting and distribution module includes a fiber splitter (1), a toothed comb (2), and a microscope. A glass tube pretreatment module for spraying and baking glass tubes, the glass tube pretreatment module including a release agent spraying machine and a muffle furnace; The hot-melt processing module is used to control the heating, heat preservation and cooling under negative pressure environment, and to complete the bundling of glass tubes and optical fibers. And a post-processing module for grinding and polishing glass fiber assemblies, the post-processing module including a three-band heating furnace and a grinding and polishing machine.

8. The multi-component glass fiber thermal fusion bundling device according to claim 7, characterized in that: The hot-melting processing module includes a support plate (8), an optical fiber splicing fixture (3), and a tubular furnace heating mechanism (4). The tubular furnace heating mechanism (4) includes a tubular furnace (40), a fixed bracket (41), an electric heating wire output end (42), a thermocouple bracket (43), a cavity (44), a vacuum pump (5), a sealing plug, and a tubular furnace temperature control. Two electric heating wire output ends (42) are installed on one side wall of the tubular furnace (40), and the two electric heating wire output ends (42) are symmetrically distributed along the axis of the tubular furnace (40). The cavity (44) is opened at the center of the tubular furnace (40). Symmetrically distributed insertion interfaces (7) are provided on the two end walls of the tube furnace (40) corresponding to the cavity (44). A fiber optic splicing fixture (3) is provided above the tube furnace (40). The vacuum pump (5) is located on one side of the tube furnace (40). A tube furnace temperature control is also provided on the upper end of the support plate (8). A sealing plug is located inside the tube furnace (40). One side of the fixed bracket (41) is fixedly installed on the outer wall of the tube furnace (40), and the other side is installed on the side of the support plate (8). The bottom of the tube furnace (40) is placed on the support plate (8). A thermocouple bracket (43) is installed on the side wall of the tube furnace (40) away from the heating wire output end (42).

9. The multi-component glass fiber thermal fusion bundling device according to claim 8, characterized in that: Thermocouples are installed inside the thermocouple bracket (43). The end of the thermocouple away from the thermocouple bracket (43) is located inside the tubular furnace (40). The tubular furnace temperature control is a tubular furnace temperature control box (6). The tubular furnace temperature control box (6) is fixedly installed on the support plate (8). The tubular furnace temperature control box (6) and the heating wire output end (42) are connected by wired connection.

10. The multi-component glass fiber thermal fusion bundling device according to claim 9, characterized in that: The tubular furnace temperature control box (6) is equipped with multiple temperature control buttons. These buttons are electrically connected to the controller of the tubular furnace temperature control box (6) via wires. The tubular furnace (40) is connected to a vacuum pump (5) for extracting gas from the tubular furnace (40) via a sealing pipe (9). The sealing insert includes a core (13) and a sealing ring (14) disposed in the cavity (44). Both ends of the core (13) are provided with the sealing ring (14). 4) The insert (13) is located below the sealing tube (9). The lower end of the sealing tube (9) is inserted into the insertion interface (7) located at the upper end of the tubular furnace (40). The wire splitter (1) includes a first port (10), a second port (11) and a third port (12). The diameters of the second port (11) and the third port (12) are the same, and the diameters of the second port (11) and the third port (12) are both smaller than the diameter of the first port (10).

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