A high-quality sleeve fused optical fiber bundle preparation device and process

Abstract

The invention discloses a high-quality sleeve fused optical fiber bundle preparation device, including an operating platform, a vertical bracket is arranged on the operating platform, a lifting motor and a rotating motor are arranged on the top of the vertical bracket, a lifting screw assembly connected to the lifting motor is arranged on the surface, the rotating motor is connected to one end of the hexagonal column, and the other end of the hexagonal column is connected to the vertical bracket through an end plate, a lifting platform is arranged on the screw lifting assembly, a lifting base is arranged on the lifting platform, a driving pulley and a driven pulley are arranged on the lifting base, bearings are arranged between the driving pulley and the lifting base and between the driven pulley and the lifting base, the driving pulley is sleeved on the hexagonal column through an internally arranged hexagonal inner cavity, a drill clamp is also arranged below the driven pulley, and the driven pulley and the drill clamp rotate synchronously and are arranged through; a matching preparation method is also disclosed. The invention has a simple structure and can efficiently assist in the production of optical fiber bundles.

Description

Technical Field

[0001] The invention relates to the technical field of fused optical fiber preparation, and in particular to a high-quality sleeve fused optical fiber bundle preparation device and process. Background Art

[0002] Fiber laser refers to a laser that uses rare earth-doped glass fiber as a gain medium. Fiber lasers have a wide range of applications, including laser fiber communications, laser space long-distance communications, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing roller making, metal and non-metal drilling / cutting / welding (brass welding, quenching, cladding and deep welding), military defense security, medical equipment, large-scale infrastructure, as a pump source for other lasers, etc. It is inevitable that higher power output will be generated during use, so the requirements for optical fiber are greatly increased.

[0003] The fused fiber bundle is a structure that can meet the requirements of use. It is composed of a bunch of very thin (about 100-600μm in diameter) quartz fiber filaments, which are melted with the glass tube on the outside to form a transmission end, and then metal parts are used on the outside to protect the glass fiber bundle to obtain a finished joint.

[0004] The quality of the molten end of the optical fiber bundle directly affects the quality of use. The finished product of the existing molten optical fiber bundle has more impurities and bubbles, the melting effect is poor, and it also needs the help of auxiliary glue and other materials to complete the preparation. These factors are very likely to cause optical fiber damage when used in a high-energy environment. In addition, the research on molten optical fiber bundles is mainly based on foreign special optical fiber suppliers. Therefore, our company has proposed a new high-quality preparation solution and provided a matching preparation device. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-quality sleeve fused optical fiber bundle preparation device and process, which has a simple structure, can efficiently assist in the production of optical fiber bundles, has excellent quality, and is suitable for use in high-energy environments.

[0006] In order to solve the above technical problems, the present invention provides a high-quality sleeve molten optical fiber bundle preparation device, including an operating platform, a vertical bracket is arranged on the operating platform, a lifting motor and a rotating motor are arranged on the top of the vertical bracket, a lifting screw rod assembly connected to the lifting motor is arranged on the surface of the vertical bracket, the rotating motor is connected to one end of the hexagonal column, and the other end of the hexagonal column is connected to the vertical bracket through an end plate, a lifting platform is arranged on the screw rod lifting assembly, a lifting platform is arranged on the lifting platform, a lifting base is arranged on the lifting base, a driving pulley and a driven pulley are arranged on the lifting base, bearings are arranged between the driving pulley and the lifting base and between the driven pulley and the lifting base, the driving pulley is sleeved on the hexagonal column through an internally arranged hexagonal inner cavity, the driving pulley is connected to the driven pulley through a transmission belt, a drill clamp is also arranged below the driven pulley, the driven pulley and the drill clamp rotate synchronously and are arranged through, and a guide slide rail is also arranged between the lifting base on one side of the driven pulley and the vertical bracket.

[0007] Furthermore, a gas rotary joint is arranged above the driven pulley, a driven pipe is arranged between the gas rotary joint and the driven pulley, and the gas rotary joint is installed on the vertical bracket through a fixing frame.

[0008] Furthermore, the gas rotary joint and the driven pulley are both provided with hollow plugs, and the two hollow plugs are inserted into the two ends of the driven pipe and fixed.

[0009] Furthermore, the hollow plug head comprises a metal ring, an annular rubber sleeve is sleeved on the outer circumference of the metal ring, and an anti-slip convex portion is arranged on the outer surface of the annular rubber sleeve.

[0010] Furthermore, a melting bracket is provided on the operating platform, and the melting bracket is used to fix the flame gun, and the flame gun is connected to the oxyhydrogen flame machine, and the oxyhydrogen flame machine is fixedly arranged on the operating platform.

[0011] Furthermore, a material receiving box is arranged on the operating platform below the drill clamp.

[0012] Furthermore, a centering plate is provided between the receiving box and the vertical bracket, a first centering magnet is provided on the receiving box, a second centering magnet is provided on the centering plate, and the first centering magnet and the second centering magnet cooperate to locate the receiving box.

[0013] Furthermore, the side of the vertical bracket is also connected to the baffle through a hinge.

[0014] A high-quality sleeve fused optical fiber preparation process, comprising any one of the preparation devices described above, and the specific steps are as follows:

[0015] Step 1) Material preparation: select the number of optical fiber filaments according to the number of inner cores, then use an alcohol lamp to burn one end of the optical fiber filament to remove the coating, put the burned optical fiber filament into a beaker filled with sulfuric acid to soak and remove impurities, rinse the optical fiber soaked in sulfuric acid with clean water, blow dry with an air gun, and finally wipe it with clean paper dipped in alcohol for standby use; then put the quartz tube into an ultrasonic machine filled with alcohol for cleaning, and then blow dry with an air gun for standby use;

[0016] Step 2) inserting the uncoated end of the spare optical fiber into the spare quartz tube; firstly, the uncoated end of the optical fiber is placed against a flat plate to level the end, and then the optical fiber is bundled with a thin wire to ensure that the bundle is dense, and then the uncoated end is inserted into the quartz tube and passed out from the other end, and the thin wire is removed after passing out;

[0017] Step 3) Melting preparation: fix the quartz tube after the tube is threaded on the drill clamp of the preparation device, then start the rotary motor, the drill clamp rotates at a constant speed, then turn on the hydrogen and oxygen machine, and use the igniter to ignite the flame gun for standby use;

[0018] Step 4) Melting: Aim the flame of the flame gun straight or obliquely at the lower end of the sleeve and keep a proper distance. First, use the outer flame to evenly preheat, that is, burn the surface of the quartz tube back and forth at a uniform speed to quickly discharge water vapor. After the preheating is completed, continue to use the outer flame to melt the optical fiber exposed outside the quartz tube. After the optical fiber is integrated, focus on melting the intersection of the optical fiber and the quartz tube. At this time, the flame gradually changes from the outer flame to the inner flame. When the flame appears red and white, it proves that the quartz tube and the optical fiber have been completely melted.

[0019] Step 5) annealing, performing annealing by controlling the flame of a flame gun, removing the flame after annealing, stopping the melting, and obtaining a semi-finished product;

[0020] Step 6) Cut off the end of the semi-finished product, and then grind and polish the cut end to obtain a finished product.

[0021] Furthermore, the decoating length in step 1) is 4-10 cm, and the sulfuric acid soaking time is at least 2 minutes; during the preheating process in step 4), the vacuum is turned on to evacuate the inside of the casing.

[0022] Beneficial effects of the present invention:

[0023] 1. The vertical arrangement is adopted for melting, which will not cause sagging due to its own weight after melting, and effectively improve the melting quality.

[0024] 2. The rotating motor is fixed on the vertical bracket to ensure that the load on the lifting base is greatly reduced, making the lifting movement stable, reducing wear and tear, and increasing service life.

[0025] 3. The drill bit clamp can quickly and reliably clamp the casing, is easy to operate, has low preparation cost, and has good centering effect.

[0026] 4. This process does not use any epoxy resin or adhesive in the preparation process. It is prepared by directly melting the end and adopts a single-end clamping and melting method, which can effectively reduce the generation of bubbles. The fiber arrangement on the end face of the finished product can present a standard honeycomb structure, so it can be used in a temperature range of up to 1000°C and meet the use in high-energy environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the connection of the driven pipe of the present invention;

[0029] Figure 3 is a schematic diagram of the structure of a molten stent in one embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the rapid response box of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the present invention in which a spring piece is provided;

[0032] Figure 6 This is a comparison experiment diagram of the smoothness of the present invention;

[0033] Figure 7 This is a comparison experiment diagram of the size of the flame of the present invention;

[0034] Figure 8 It is a comparison diagram before and after shrinkage of the present invention;

[0035] Fig. 9 This is a bubble-free fusion diagram of 60 optical fibers and a quartz tube according to the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0037] Reference Figure 1 and Figure 2As shown, an embodiment of the high-quality sleeve molten optical fiber bundle preparation device of the present invention comprises an operating platform 1, a vertical bracket 2 is arranged on the operating platform, a lifting motor 3 and a rotating motor 4 are arranged on the top of the vertical bracket, a lifting screw rod assembly 5 connected to the lifting motor is arranged on the surface of the vertical bracket, the rotating motor is connected to one end of the hexagonal column 6, and the other end of the hexagonal column is connected to the vertical bracket through an end plate, a lifting platform is arranged on the screw rod lifting assembly, a lifting platform is arranged on the lifting platform, a lifting base 7 is arranged on the lifting base, a driving pulley 8 and a driven pulley 9 are arranged on the lifting base, bearings are arranged between the driving pulley and the lifting base and between the driven pulley and the lifting base, the driving pulley is sleeved on the hexagonal column through an internally arranged hexagonal inner cavity, the driving pulley is connected to the driven pulley through a transmission belt, a drill clamp 10 is also arranged below the driven pulley, the driven pulley and the drill clamp rotate synchronously and are arranged through, and a guide slide rail 11 is also arranged between the lifting base on one side of the driven pulley and the vertical bracket.

[0038] During melting, the lifting platform is first driven down by the lifting motor, that is, the lifting base is lowered. When descending, the driving pulley and the driven pulley are lowered together. Due to the setting of the hexagonal column, the driving pulley can descend without obstruction. The descent is mainly for the convenience of installation. After it is lowered into place, the optical fiber is inserted into the casing, and then the inserted whole is lowered from the center of the driven pulley until it passes through the drill clamp, and then the drill clamp is adjusted to clamp the casing to achieve fixation. After fixation, the lifting base is lifted by the lifting motor so that the melting part is located in a suitable position, and then the hydrogen-oxygen flame is used to melt the position. While melting, the rotating motor is actuated, and the rotating motor drives the hexagonal column to rotate, and the hexagonal column drives the driving pulley to rotate. The driving pulley drives the driven pulley to rotate through the transmission belt, and the rotation of the driven pulley drives the drill clamp to rotate, thereby achieving a uniform heating effect.

[0039] In order to improve the preparation quality, vacuum adsorption is performed on the sleeve during the melting process. The specific structure is as follows: a gas rotary joint 12 is arranged above the driven pulley, a driven tube 13 is arranged between the gas rotary joint and the driven pulley, the gas rotary joint is installed on the vertical bracket through a fixed frame, and a driven tube cover is arranged on the molten optical fiber bundle to evacuate, and the driven tube rotates together with the optical fiber bundle, which is safe and reliable, and the driven tube can also protect the optical fiber filaments extending out of the sleeve, thereby improving the yield rate of the finished product after preparation. Specifically, a hollow plug 14 is arranged on the gas rotary joint and the driven pulley, and the two hollow plugs are inserted into the two ends of the driven tube and fixed, and the hollow plug includes a metal ring 15, which ensures the fixing strength, and an annular rubber sleeve 16 is arranged on the outer periphery of the metal ring, and the annular rubber sleeve ensures the stability of the sealing effect, and an anti-slip convex portion is arranged on the outer surface of the annular rubber sleeve, which achieves a firm fixing effect while sealing and can rotate synchronously. During the specific installation, after the drill clamp clamps the casing, the driven tube is first sleeved on the optical fiber bundle, and then the lower end is inserted into the corresponding hollow plug to achieve preliminary fixation. Subsequently, during the rising process of the lifting base, it is aligned with the corresponding hollow plug at the upper end, and the upper end of the driven tube is inserted into the corresponding hollow plug through the thrust of the lifting base when it rises, and then the rising is stopped. The size of the driven tube can be determined according to the prepared length and the melting position.

[0040] The above-mentioned operating platform is provided with a melting bracket 17, which is used to fix the flame gun, which is connected to the oxyhydrogen flame machine 18, and the oxyhydrogen flame machine is fixedly arranged on the operating platform. The side of the vertical bracket is also connected to the baffle through a hinge. When the flame gun is melting, high temperature is prone to accidents. Therefore, the baffle can be used to block and protect the flame gun in the spraying direction, and the hinge can ensure that the baffle can be moved, so it will not get in the way during maintenance and installation of the casing.

[0041] A material receiving box 19 is also provided on the operating platform below the drill clamp, which is used to receive objects dropped during the melting process above, so as to ensure the cleanliness of the overall preparation environment and facilitate cleaning. A centering plate 20 is also provided between the material receiving box and the vertical bracket, and a first centering magnet is provided on the material receiving box, and a second centering magnet is provided on the centering plate. When the first centering magnet and the second centering magnet are attracted to each other, the position of the material receiving box can be located, wherein the second centering magnet is fixed in position and remains unchanged, while the first centering magnet can move with the material receiving box, so that when the position deviates, it cannot be adsorbed, and when the placement position is centered, it can be quickly adsorbed and fixed, so that the correctness of the placement position can be quickly determined by the state of the material receiving box, and the problem of the material receiving box falling due to accidental collision can also be avoided.

[0042] In one embodiment, referring to Figure 3As shown, in order to better assist preparation, a melting support that is easy to adjust is also provided, the melting support includes a switch-type magnetic base 21, a manual two-axis movable platform 22 is arranged on the switch-type magnetic base, front and rear fine-tuning screws 23 and left and right fine-tuning screws 24 are arranged on the manual two-axis movable platform, a miniature lifter 25 is also arranged on the top of the manual two-axis movable platform, the miniature lifter includes a bottom plate 26 and a top plate 27 arranged in parallel, a lifting guide module 28 and a lifting fine-tuning screw 29 are arranged between the bottom plate and the top plate, a clamping base 210 is arranged on the surface of the top plate, a horizontal clamping through hole 211 is opened on the clamping base, a spiral pressing knob 212 is arranged on the top of the clamping base, and the clamping base fixes the flame gun body in the horizontal clamping through hole through the spiral pressing knob. When in use, place the switch-type magnetic base directly on the platform, then turn on the switch so that the switch-type magnetic base is firmly fixed to ensure that the upper structure does not shake, then extend the flame gun into the horizontal clamping through hole, turn the spiral push-down knob, so that the spiral push-down knob rotates and presses the flame gun, thereby achieving fixation. The operation is simple, and then adjust the front and rear fine-tuning screws, left and right fine-tuning screws, and lifting fine-tuning screws according to the melting position. Of course, it can also be adjusted after ignition or during the melting process. When adjusting the above operation, due to the stable adsorption of the bottom, it is safe and reliable, and it will not be accidentally touched and tipped over during the melting process, and it will not shake during melting, thereby improving the preparation quality.

[0043] Reference Figure 3 and Figure 4As shown, since the melting is done manually, a quick response mechanism is provided to avoid losses caused by improper operation when the fire source needs to be evacuated quickly due to negligence or the need to evacuate quickly. A quick response box 213 is provided between the top plate and the clamping base, a supporting foot 214 is provided at the bottom of the quick response box, a rotating column 215 is provided in the quick response box, the top of the rotating column passes through the top of the quick response box and is connected to the clamping base, the bottom of the rotating column passes through the bottom of the quick response box and is connected to the limiting bottom plate 216, a torsion spring is provided between the rotating column and the inside of the quick response box, a torsion limiting column 217 is provided on the surface of the rotating column, a rotation limiting groove 218 is provided on the surface of the quick response box corresponding to the torsion limiting column, the torsion limiting column is provided in the rotation limiting groove to limit the rotation angle of the rotating column, and the rotation limiting groove includes an upper limit groove 219, an inclined slide 220 and a lower slide 221 connected in sequence. When in use, the torsion limit post is located in the upper limit slot. At this time, the torsion spring is twisted and force is accumulated, and its torsion can limit the torsion limit post in the upper limit slot and cannot rotate. When it is necessary to evacuate the fire source, directly tap the spiral pressure knob, and the spiral pressure knob squeezes the clamping base downward, that is, the rotating column moves downward, and after moving downward, it will also move downward with the torsion limit post and disengage from the upper limit slot. Since there is no restriction on the side wall of the upper limit slot, the torsion force of the torsion spring is released, so that the rotating column rotates, driving the torsion limit post to rotate and move to the inclined slide and the lower slide and then stop moving, that is, it rotates a certain angle, effectively evacuating the fire source; the operation is simple and can be responded to quickly. The trigger position is located at the top, which is convenient for operation and greatly shortens the evacuation time.

[0044] Reference Figure 5 As shown, in order to avoid the fire source being evacuated due to accidental touch, a spring clip 222 is also provided in the quick response box. The direction of the spring clip is consistent with the inclination direction of the oblique slide and is located below the torsion limit column. When pressed down by accidental touch, the spring clip provides a downward pressure reaction force. The downward pressure will not be particularly large when accidentally touched, so the spring clip is sufficient to keep the torsion limit column in the upper limit groove without falling out. Therefore, when the pressure of the accidental touch disappears, the torsion limit column can be squeezed and reset to the upper limit groove by the spring clip, which is stable and reliable to use. When the downward pressure continues and the downward pressure is greater than the upper limit groove, the torsion limit column will break away from the upper limit groove and enter the oblique slide. At this time, the torsion limit column is driven to rotate by the torsion spring. At the same time, the spring clip also has elastic force, which can push the torsion limit column toward the oblique slide, forming an effect of strengthening rotation and improving the evacuation effect. Therefore, the above-mentioned spring clip can not only keep the torsion limit column from sliding when accidentally touched, but also assist in movement after unlocking.

[0045] Therefore, the switch-type magnetic base of the above-mentioned melting bracket has a strong suction force, stable and reliable fixation, and is easy to disassemble compared with magnets. During the movement, there is no need to pull out the magnet with force, and you can directly turn off the switch; coarse adjustment can be made through the placement, and then it can be freely adjusted in space through three fine-tuning screws. The adjustment range is small and the precision is high. There is no problem of difficulty in adjustment due to the large adjustment range caused by manual bending; the micro lift has a simple structure and a small height, which avoids the problem of the overall height being too high to meet the melting height.

[0046] The present invention also discloses a high-quality sleeve fused optical fiber preparation process, which uses the above-mentioned preparation device to assist in processing, and the specific steps are as follows:

[0047] First, prepare the materials; select the number of optical fiber strands according to the number of inner cores, and then use an alcohol lamp to burn one end of the optical fiber to remove the coating. The length of the coating can be 6-7mm. The changed length can meet the melting size and is also convenient for soaking. Put the burned optical fiber strands into a beaker filled with sulfuric acid to soak and remove impurities, rinse the optical fiber soaked in sulfuric acid with clean water, and blow it dry with an air gun, and finally wipe it with clean paper dipped in alcohol for later use; then put the quartz tube into an ultrasonic machine filled with alcohol for cleaning, and then blow it dry with an air gun for later use;

[0048] Then, the uncoated end of the spare optical fiber is inserted into the spare quartz tube; first, the uncoated end of the optical fiber is placed against a flat plate to level the end, and then the optical fiber is bundled with a thin wire to ensure that the bundle is dense, and then the uncoated end is inserted into the quartz tube and passed out from the other end, and the thin wire is removed after passing out;

[0049] Prepare for melting; fix the quartz tube after tube penetration on the drill clamp of the preparation device, then start the rotary motor, and the drill clamp rotates at a constant speed. For specific usage steps, refer to the description in the preparation device. Then turn on the hydrogen-oxygen machine and use the igniter to ignite the flame gun for standby use;

[0050] After the preparation is completed, the melting process is carried out; the flame of the flame gun is aimed directly or obliquely at the lower end of the sleeve, and an appropriate distance is maintained. First, the outer flame is used for uniform preheating, that is, the surface of the quartz tube is burned back and forth at a uniform speed to discharge water vapor quickly. During the preheating, vacuuming is required, and the discharged water vapor will not gather in the sleeve and can be quickly pumped away. After the preheating is completed, the outer flame is continued to be used to melt the optical fiber exposed outside the quartz tube. After the optical fiber is integrated, the intersection of the optical fiber and the quartz tube is concentrated for melting. At this time, the flame gradually changes from the outer flame to the inner flame. When the flame appears red and white, it proves that the quartz tube and the optical fiber have been completely melted. In order to avoid damage to the optical fiber due to rapid cooling, an annealing process is carried out. The flame of the flame gun is controlled to keep warm and ensure that it is slowly cooled to room temperature. After the end, the flame is removed, the melting is stopped, and a semi-finished product is obtained.

[0051] The end of the semi-finished product is cut off, and then the cut end is ground and polished to obtain the finished product.

[0052] Specifically, we also deeply understand the above process scheme through effective experimental comparison:

[0053] Experiment 1

[0054] Insert 14 uncoated optical fibers into a quartz tube. The quartz tube uses a low melting point quartz tube (melting point is about 1500℃), which is lower than the melting point of the optical fiber cladding. The optical fiber specifications are FIP400 / 440 / 480, polyimide coating, fluorine-doped optical fiber cladding, pure quartz core diameter, and numerical aperture 0.22.

[0055] Use a special flame gun to ignite, form an oxyhydrogen flame, and heat. The diameter of the outlet hole of the oxyhydrogen flame used in the experiment can be selected as φ0.3mm, φ0.6mm, and φ0.9mm. During the heating process, the sample is rotated continuously to make it shrink evenly due to heat. A vacuum suction head is added to the back of the quartz tube. In this way, during the sintering process, the air is sucked away, and negative pressure is generated in the tube, which further discharges the gas generated during the sintering process, which can effectively avoid or reduce the generation of bubbles during the sintering process.

[0056] During the experiment, it was found that the first influencing factor was the cleanliness of the optical fiber. Before the experiment, an alcohol lamp was used to burn off the optical fiber coating, and then it was wiped with clean paper dipped in alcohol. However, many bubbles were generated during the melting process. Considering that part of the coating was not completely burned during the optical fiber burning and coating process, it was not wiped off with clean paper dipped in alcohol, but it was not observed by the human eye. Therefore, sulfuric acid was used after the alcohol burning coating. Because the optical fiber coating is a polymer material, soaking it in concentrated sulfuric acid can quickly oxidize and decompose the coating, and finally achieve the purpose of completely removing the coating. Reference Figure 6 As shown, the left side is the effect picture without acid soaking, and the right side is the effect picture after sulfuric acid soaking. Therefore, after the optical fiber is burned off the coating with an alcohol lamp, it is soaked in sulfuric acid for about 3 minutes, then rinsed with clean water, wiped with clean paper dipped in alcohol, and finally put into the tube for use.

[0057] The second influencing factor is the size of the flame. Since the hydrogen-oxygen machine used is equipped with different sizes of flames with different amounts of hydrogen-oxygen flames, we conducted a comparative experiment on the melting conditions of the large and small flames. First, use a small flame to melt. Figure 7As shown on the left, there are many bubbles because the small flame is more concentrated and the temperature is high. During the ablation process, the temperature is difficult to control. Therefore, the temperature is too high, causing the fiber cladding to burn and explode. In addition, the outer quartz tube has melted, so the bubbles cannot be discharged, causing the bubbles to gather rapidly. Then use a large flame to melt. The flame of a large flame is more dispersed, the temperature is relatively low, and it is easier to control. The best temperature is below the melting point of the fiber cladding and above the melting point of quartz. Figure 7 As shown in the right view, the bubbles are significantly reduced during the melting process of the large flame head.

[0058] The third factor is the problem of internal and external flames. When we conducted the melting experiment, we found that the internal and external flames of the flame also had a great influence on the melting process. During the internal flame melting process, the impact force is relatively large, which causes the thermal stress of the quartz tube to change, and the heat shrinkage is uneven, so there will be more bubbles melted between the tube and the optical fiber, and there will also be problems such as bending. When the external flame is used for melting, the flame impact force is relatively small, and it has almost no effect on the thermal stress of the quartz tube. Therefore, the external flame is selected for melting, and the bubbles are reduced.

[0059] The fourth factor is the order of melting. After selecting the optimal parameters of the above four factors, the quartz tube and the optical fiber are melted. In the experiment, it was found that when the oxyhydrogen flame is used to directly burn the contact point between the optical fiber and the protective tube, bubbles will be generated, because the quartz tube is not preheated, and the oxyhydrogen flame generates water vapor, which is sealed in the tube during the melting process. However, the protective tube is preheated before melting, and the optical fiber exposed outside the tube is melted first, and then the contact point between the protective tube and the optical fiber is melted. It can be clearly seen that the optical fiber and the protective tube can be melted almost without bubbles, as shown in the figure below. This is because after the quartz tube is preheated, the water vapor is discharged, and the exposed optical fiber is fused first, and then the contact point between the optical fiber and the protective tube is melted, so that the gas generated during the melting process can be evenly discharged upward along the inner wall of the tube, achieving a bubble-free effect.

[0060] We can conclude that there are four main factors that affect melting. After a large number of experiments on these four factors, the melting process was summarized, that is, a low-melting-point quartz tube was selected, and it was cleaned with an ultrasonic machine filled with alcohol for about 1 minute before the experiment; the bare fiber was coated with an alcohol lamp, soaked in sulfuric acid for about 3 minutes, and then wiped with clean paper soaked in alcohol; and a large flame was used to preheat the outer flame evenly first, and then the optical fiber exposed outside the quartz tube was melted, and finally the junction of the tube and the fiber was burned, and at this time the flame gradually moved slowly from the outer flame to the inner flame, and the melting stopped when red and white light appeared. The prepared finished product was tightly wrapped, refer to Figure 8 Using this process, we successfully fired a completely molten optical fiber bundle without bubbles, with 60 optical fibers, as shown in Fig. 9As shown, it can be seen that the optical fiber has been completely melted together. The end face of a single optical fiber is deformed, the effective transmission area becomes smaller, and the transmission power density increases. The ratio of the output power density of the optical fiber bundle after melting and shrinking to the output power density of the original optical fiber bundle is about 1.2 to 1.3 times, and the power density is equal to the power divided by the effective area. Therefore, the optical fiber core diameter can be used to characterize the power density, that is, the optical fiber core diameter is reduced to 1.2 to 1.3 times the square root of the original core diameter to meet the index requirements. The original optical fiber core diameter is 192um. It can be calculated that the core diameter after melting and shrinking is qualified at 168um to 175um. Three optical fibers were randomly selected for core diameter measurement using a microscope. The values ​​were 170um, 170um, and 174um, respectively, proving that the fused optical fiber bundle fully meets the index requirements.

[0061] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A high-quality sleeve fused optical fiber bundle preparation device, characterized in that: The cam is provided with a lifting gear, and the lifting gear is provided with a guide rail, and a guide rail is provided between the lifting gear and the lifting gear. A gas rotary joint is arranged above the driven pulley, a driven pipe is arranged between the gas rotary joint and the driven pulley, and the gas rotary joint is installed on the vertical bracket through a fixing bracket; The gas rotary joint and the driven pulley are both provided with hollow plugs, and the two hollow plugs are inserted into the two ends of the driven pipe and fixed; The hollow plug head comprises a metal ring, an annular rubber sleeve is sleeved on the outer circumference of the metal ring, and an anti-slip convex portion is arranged on the outer surface of the annular rubber sleeve; A material receiving box is arranged on the operating platform below the drill bit clamp; a centering plate is also arranged between the material receiving box and the vertical bracket, a first centering magnet is arranged on the material receiving box, and a second centering magnet is arranged on the centering plate, and the first centering magnet and the second centering magnet cooperate to locate the position of the material receiving box.

2. The high-quality sleeve fused optical fiber bundle preparation device according to claim 1, characterized in that: The operating platform is provided with a melting bracket, which is used to fix the flame gun. The flame gun is connected to an oxyhydrogen flame machine, and the oxyhydrogen flame machine is fixedly arranged on the operating platform.

3. The high-quality sleeve fused optical fiber bundle preparation device according to claim 2, characterized in that: The side of the vertical bracket is also connected to the baffle through a hinge.

4. A high-quality fused-tube optical fiber bundle preparation process, characterized in that: The preparation device comprising any one of claims 2 to 3, wherein the specific steps are as follows: Step 1) Material preparation: select the number of optical fiber strands according to the number of inner cores, then use an alcohol lamp to burn one end of the optical fiber strand to remove the coating, soak the burned optical fiber strand in a beaker of sulfuric acid to remove impurities, rinse the optical fiber soaked in sulfuric acid with clean water, blow dry with an air gun, and finally wipe with clean paper dipped in alcohol for later use; then put the quartz tube into an ultrasonic machine filled with alcohol for cleaning, and then blow dry with an air gun for later use; Step 2) inserting the uncoated end of the spare optical fiber into the spare quartz tube; firstly, the uncoated end of the optical fiber is placed against a flat plate to level the end, and then the optical fiber is bundled with a thin wire to ensure that the bundle is dense, and then the uncoated end is inserted into the quartz tube and passed out from the other end, and the thin wire is removed after passing out; Step 3) Melting preparation: fix the quartz tube after tube penetration on the drill clamp of the preparation device, then start the rotary motor, the drill clamp rotates at a constant speed, then turn on the hydrogen and oxygen machine, and use the igniter to ignite the flame gun for standby use; Step 4) Melting: Aim the flame of the flame gun straight or obliquely at the lower end of the sleeve and keep a proper distance. First, use the outer flame to evenly preheat, that is, burn the surface of the quartz tube back and forth at a uniform speed to quickly discharge water vapor. After the preheating is completed, continue to use the outer flame to melt the optical fiber exposed outside the quartz tube. After the optical fiber is integrated, focus on melting the intersection of the optical fiber and the quartz tube. At this time, the flame gradually changes from the outer flame to the inner flame. When the flame appears red and white, it proves that the quartz tube and the optical fiber have been completely melted. Step 5) annealing, annealing is performed by controlling the flame of the flame gun, and after the annealing is completed, the flame is removed to stop melting and obtain a semi-finished product; Step 6) Cut off the end of the semi-finished product, and then grind and polish the cut end to obtain the finished product.

5. The process for preparing a high-quality fused-tube optical fiber bundle according to claim 4, characterized in that: The decoating length in step 1) is 4-10 cm, and the sulfuric acid soaking time is at least 2 minutes; during the preheating process in step 4), the vacuum is turned on to evacuate the inside of the casing.

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