Sleeve of optical fiber tapering processing system, processing system and processing method

Abstract

The invention discloses a sleeve of an optical fiber tapering processing system, a processing system and a processing method.The sleeve is internally provided with a through hole extending in the length direction of the sleeve, and the sleeve comprises a first sub-sleeve, a second sub-sleeve, a third sub-sleeve and a fourth sub-sleeve which are sequentially arranged in the length direction of the sleeve; heat insulation pieces are clamped between every two of the first sub-sleeve, the second sub-sleeve, the third sub-sleeve and the fourth sub-sleeve, fire inlet holes are formed in the bottoms of the first sub-sleeve, the second sub-sleeve and the third sub-sleeve, at least the inner wall of the fourth sub-sleeve is a heat insulation inner wall, and the bottom of the fourth sub-sleeve is closed. The size of flames sprayed by the fire spraying device can be adjusted, so that outer flames, inner flames and flame cores of the flames enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve of the sleeve from the corresponding fire inlet holes in the bottom of the sleeve respectively to heat the optical fibers, and therefore, in the process of pulling the optical fibers, the optical fibers are subjected to stepped cooling and are not prone to bending deformation, and the optical fibers are not prone to deformation. And breakage is not easy to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber processing, and in particular to a sleeve, a processing system and a processing method of an optical fiber taper processing system. Background Art

[0002] High-power all-fiber large pulse energy (femtosecond, picosecond, nanosecond) lasers are widely used in the fields of new energy, semiconductors, precision micro-machining of aerospace and national defense due to their narrow pulse width, large single pulse energy, and high repetition frequency. Compared with solid-state lasers and titanium sapphire lasers, ultrashort pulse lasers realized by all-fiber laser solutions have the advantages of low cost, simple structure, high efficiency, and good stability, which are more conducive to large-scale industrial applications.

[0003] In the application fields of manufacturing or using optical fibers, it is sometimes necessary to perform a heating and taper process on the optical fibers.

[0004] The existing technical solutions for tapered optical fibers can be roughly divided into two production methods: one is to use a tapered tower device with an electric heating furnace to make the tapered optical fiber. The electric heating furnace can provide uniform heating for the optical fiber, and the produced optical fiber is of good quality and basically will not deform. However, the current tapered tower device has a complex structure, a huge volume, and is expensive; the other is to use a hydrogen-oxygen flame to heat an ordinary uniform core diameter optical fiber to a softened state and stretch it to one side or both sides. When the hydrogen-oxygen flame is heated, the temperature of the heated area can rise to thousands of degrees, while the temperature of the non-heated area is room temperature. During the optical fiber stretching process, there will be a large temperature drop from the heated area to the non-heated area (such as Figure 1 As shown in the figure, it is easy to cause the optical fiber to bend and deform, which will change the refraction of light by the optical fiber, thus seriously affecting the quality of the optical fiber and even causing the optical fiber to break.

[0005] In view of the above-mentioned deficiencies, it is necessary to design a sleeve, a processing system and a processing method for an optical fiber taper processing system. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is that in the process of optical fiber taper in the prior art, the optical fiber will experience a large temperature drop from the heated area to the non-heated area, thereby providing a sleeve, a processing system and a processing method for an optical fiber taper processing system.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A sleeve of an optical fiber tapering processing system, wherein a through hole extending along the length direction thereof is formed in the sleeve, and the sleeve comprises a first sub-sleeve, a second sub-sleeve, a third sub-sleeve and a fourth sub-sleeve arranged in sequence along the length direction thereof, a heat insulating member is sandwiched between each of the first sub-sleeve, the second sub-sleeve, the third sub-sleeve and the fourth sub-sleeve, a fire inlet hole is formed at the bottom of the first sub-sleeve, the second sub-sleeve and the third sub-sleeve, at least the inner wall of the fourth sub-sleeve is a heat insulating inner wall, and the bottom of the fourth sub-sleeve is closed.

[0009] Furthermore, the fourth sub-bushing is a heat insulating member made of heat insulating material.

[0010] Further, the thermal insulation member is a thermal insulation ring, the thermal insulation ring extends inwardly along the radial direction of the sleeve into the through hole, and the center hole of the thermal insulation ring is connected to the through hole along the length direction of the sleeve; or,

[0011] The first sub-bushing, the second sub-bushing, the third sub-bushing and the fourth sub-bushing are collectively referred to as sub-bushings, and the thermal insulation member is a thermal insulation coating provided on the end surface of the sub-bushing, and the thermal insulation coating is also provided between the third sub-bushing and the fourth sub-bushing.

[0012] Furthermore, the thermal insulation ring is also provided between the third sub-casing and the fourth sub-casing.

[0013] Furthermore, in the projection on the vertical plane, the two opposite end surfaces on the third sub-casing are close to each other from bottom to top, the end surfaces of the second sub-casing and the fourth sub-casing facing the third sub-casing are respectively matched with the two end surfaces of the third sub-casing, the end surfaces of the first sub-casing and the second sub-casing facing each other are matched, and the end surface of the second sub-casing facing away from the third sub-casing tilts toward the direction of the third sub-casing.

[0014] Furthermore, an angle between the inclined end faces on the first sub-casing, the second sub-casing, the third sub-casing and the fourth sub-casing and a horizontal plane is 1 degree to 18 degrees.

[0015] Furthermore, the ratio of the lengths of the bottoms of the first sub-casing, the second sub-casing, and the third sub-casing is 10:7:17.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The sleeve of the optical fiber taper processing system provided by the present invention comprises a first sub-sleeve, a second sub-sleeve, a third sub-sleeve and a fourth sub-sleeve arranged in sequence along its length direction, a heat insulating member is sandwiched between the first sub-sleeve, the second sub-sleeve, the third sub-sleeve and the fourth sub-sleeve, a fire inlet hole is opened at the bottom of the first sub-sleeve, the second sub-sleeve and the third sub-sleeve, at least the inner wall of the fourth sub-sleeve is a heat insulating inner wall, and the bottom of the fourth sub-sleeve is closed. In this way, after the optical fiber enters the through hole of the sleeve, the size of the flame sprayed by the flame spraying device can be adjusted so that the outer flame, the inner flame and the flame core of the flame are ejected from the corresponding fire inlet holes on the bottom of the sleeve. The first sub-tube, the second sub-tube and the third sub-tube of the sleeve respectively enter the sleeve to heat the optical fiber, and the fourth sub-tube will isolate the heat of the flame from the optical fiber. Then, during the pulling process, the optical fiber will gradually pass through the first sub-tube with the highest temperature corresponding to the outer flame, the second sub-tube with the second lowest temperature corresponding to the inner flame, and the third sub-tube with the third highest temperature corresponding to the flame core, and then enter the fourth sub-tube. During the entire optical fiber stretching process, the optical fiber will experience step cooling and will not directly enter room temperature. The optical fiber is not easy to bend and deform, and is even less likely to break, thereby ensuring the stability of the optical fiber's refraction of light and ultimately ensuring the quality of the optical fiber.

[0018] 2. In the sleeve of the optical fiber taper processing system provided by the present invention, the fourth sub-sleeve is a heat-insulating sleeve made of a heat-insulating member, rather than a heat-insulating layer attached to the inner wall of the fourth sub-sleeve, thereby simplifying the processing of the fourth sub-sleeve.

[0019] 3. The sleeve of the optical fiber taper processing system provided by the present invention, the thermal insulation member is a thermal insulation ring, the thermal insulation ring extends inwardly along the radial direction of the sleeve into the through hole, and the central hole of the thermal insulation ring is connected to the through hole along the length direction of the sleeve. The setting of the thermal insulation ring can limit the outer flame, the inner flame, and the flame core to the first sub-sleeve, the second sub-sleeve, and the third sub-sleeve respectively, and at the same time, it can prevent the flame core from entering the fourth sub-sleeve, ensuring that the optical fiber experiences step cooling during the pulling process.

[0020] 4. The projection of the sleeve of the optical fiber taper processing system provided by the present invention on the vertical plane is that the two opposite end faces on the third sub-sleeve approach each other from bottom to top, the end faces of the second sub-sleeve and the fourth sub-sleeve facing the third sub-sleeve are respectively matched with the two end faces of the third sub-sleeve, the end faces of the first sub-sleeve and the second sub-sleeve facing each other are matched, and the end face of the second sub-sleeve facing away from the third sub-sleeve tilts toward the direction of the third sub-sleeve, so that the outer flame, inner flame and flame core of the flame sprayed by the flame-throwing device can enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve as much as possible, respectively, to heat the optical fiber and form a better step cooling.

[0021] 5. In the sleeve of the optical fiber taper processing system provided by the present invention, the angle between the inclined end faces of the first sub-sleeve, the second sub-sleeve, the third sub-sleeve and the fourth sub-sleeve and the horizontal plane is 1 degree to 18 degrees. In this way, the outer flame, inner flame and flame core of the flame sprayed by the flame-spraying device can be further allowed to enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve as much as possible, respectively, to heat the optical fiber and form a better step cooling.

[0022] 6. In the optical fiber taper processing system provided by the present invention, the length ratio of the bottom of the first sub-sleeve, the second sub-sleeve and the third sub-sleeve is 10:7:17, so that the outer flame, the inner flame and the flame core of the flame sprayed by the flame-spraying device can further enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve as much as possible, so as to heat the optical fiber and form a better step cooling.

[0023] An optical fiber taper processing system comprises the aforementioned optical fiber taper processing system sleeve, a feeding device and a taper device, wherein the feeding device and the taper device are respectively located at two opposite sides of the sleeve in the length direction.

[0024] The technical solution of the present invention has the following advantages:

[0025] The optical fiber taper processing system provided by the present invention has all the advantages of the sleeve of the aforementioned optical fiber taper processing system.

[0026] A method for processing optical fiber taper, based on the sleeve of the aforementioned optical fiber taper processing system, comprises the following steps:

[0027] Passing the optical fiber through the through hole of the sleeve;

[0028] A flamethrower is placed below the sleeve, so that the outer flame, inner flame and flame core of the flame sprayed by the flamethrower enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve of the sleeve respectively from the corresponding fire inlet holes on the bottom of the sleeve, and the fourth sub-sleeve separates the optical fiber entering therein from the flame.

[0029] Furthermore, the distance between the lowest point of the sleeve and the top of the nozzle of the flame-throwing device is 2 mm to 8 mm.

[0030] The technical solution of the present invention has the following advantages:

[0031] The optical fiber taper processing method provided by the present invention adopts the sleeve of the aforementioned optical fiber taper processing system, and makes the outer flame, inner flame and flame core of the flame sprayed by the flame spraying device enter the first sub-sleeve, the second sub-sleeve and the third sub-sleeve of the sleeve from the corresponding fire inlet holes on the bottom of the sleeve respectively, and the fourth sub-sleeve separates the optical fiber entering therein from the flame. Therefore, in the process of pulling the optical fiber, the optical fiber will gradually pass through the first sub-sleeve with the highest temperature corresponding to the outer flame, the second sub-sleeve with the second lowest temperature corresponding to the inner flame, and the third sub-sleeve with the third highest temperature corresponding to the flame core, and then enter the fourth sub-sleeve. In the whole optical fiber stretching process, the optical fiber will experience step cooling and will not directly enter room temperature. The optical fiber is not easy to bend and deform, and is even less likely to break, thereby ensuring the stability of the optical fiber's refraction of light, and ultimately ensuring the quality of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a temperature variation diagram of an optical fiber in the prior art;

[0034] Figure 2 A schematic diagram of a sleeve and a flame in an embodiment of the present invention;

[0035] Figure 3 It is a schematic structural diagram of a sleeve with a heat insulation ring in an embodiment of the present invention;

[0036] Figure 4 This is a temperature variation diagram of the optical fiber in the present invention.

[0037] Description of reference numerals:

[0038] 2. Flame-throwing device; 20. Nozzle; 21. Outer flame; 22. Inner flame; 23. Flame core; 4. Sleeve; 40. Through hole; 41. First sub-sleeve; 42. Second sub-sleeve; 43. Third sub-sleeve; 44. Fourth sub-sleeve; 45. Fire inlet hole; 46. Heat-insulating ring; 461. Center hole; 8. Optical fiber. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiment is a set of pipe embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] like Figure 2 and Figure 3 As shown, this embodiment provides a sleeve (hereinafter referred to as sleeve 4) for an optical fiber taper processing system, wherein the sleeve 4 is formed with a plurality of Figure 2 The sleeve 4 includes a through hole 40 extending in the direction indicated by the dashed arrow, and the sleeve 4 includes a first sub-sleeve 41, a second sub-sleeve 42, a third sub-sleeve 43 and a fourth sub-sleeve 44 arranged in sequence along its length direction. A heat insulating member is sandwiched between the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43. The bottoms of the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43 are all provided with a fire inlet hole 45. At least the inner wall of the fourth sub-sleeve 44 is a heat insulating inner wall, and the bottom of the fourth sub-sleeve 44 is closed. For the convenience of description, the first sub-sleeve 41, the second sub-sleeve 42, the third sub-sleeve 43 and the fourth sub-sleeve 44 are collectively referred to as sub-sleeves.

[0045] In this embodiment, since the sleeve 4 includes a first sub-sleeve 41, a second sub-sleeve 42, a third sub-sleeve 43 and a fourth sub-sleeve 44 arranged in sequence along the length direction thereof, a heat insulating member is sandwiched between the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43, the bottoms of the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43 are all provided with a flame inlet hole 45, at least the inner wall of the fourth sub-sleeve 44 is a heat insulating inner wall, and the bottom of the fourth sub-sleeve 44 is closed, in this way, after the optical fiber 8 enters the through hole 40 of the sleeve, the size of the flame sprayed by the flame spraying device 2 can be adjusted so that the outer flame 21, the inner flame 22 and the outer flame 23 are larger than the outer flame 24. The flame 22 and the flame core 23 enter the first sub-tube 41, the second sub-tube 42 and the third sub-tube 43 of the sleeve 4 respectively from the corresponding flame inlet holes 45 on the bottom of the sleeve 4 to heat the optical fiber 8, and the fourth sub-tube 44 will isolate the heat of the flame from the optical fiber 8. Then, during the pulling process, the optical fiber 8 will gradually pass through the first sub-tube 41 with the highest temperature corresponding to the outer flame 21, the second sub-tube 42 with the second lowest temperature corresponding to the inner flame 22, and the third sub-tube 43 with the third lowest temperature corresponding to the flame core 23, and then enter the fourth sub-tube 44, so that during the entire optical fiber 8 stretching process, the optical fiber 8 will experience a step-by-step cooling (such as Figure 4 As shown in the figure, the optical fiber 8 will not directly enter the room temperature from the high temperature, so it is not easy for the optical fiber 8 to bend and deform, and even less likely to break, thereby ensuring that the refraction of light by the optical fiber 8 is stable, and ultimately ensuring the quality of the optical fiber 8.

[0046] There are two implementations for thermal insulation:

[0047] In one embodiment, Figure 3 As shown, the heat insulating member is a heat insulating ring 46, which is perpendicular to the length direction of the sleeve 4 and extends inwardly along the radial direction of the sleeve 4 into the through hole 40. The center hole 461 of the heat insulating ring 46 is connected to the through hole 40 along the length direction of the sleeve 4, and the heat insulating ring 46 is also arranged between the third sub-sleeve 43 and the fourth sub-sleeve 44. In the process of the optical fiber 8 passing through the through hole 40, it will also gradually pass through the center holes 461 of the first sub-sleeve 41, the second sub-sleeve 42, the third sub-sleeve 43 and the fourth sub-sleeve 44. The provision of the heat insulating ring 46 can limit the outer flame 21, the inner flame 22 and the flame core 23 to the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43 respectively, to ensure that the optical fiber undergoes step cooling during the pulling process, and at the same time, it can prevent the flame core 23 from entering the fourth sub-sleeve 44. Of course, the heat insulating ring 46 may not be arranged between the third sub-sleeve 43 and the fourth sub-sleeve 44. In addition, from Figure 3 It can also be seen that the top of the sleeve 4 is also provided with an opening, of course, the opening may not be provided.

[0048] In another embodiment, the first sub-casing 41, the second sub-casing 42, the third sub-casing 43 and the fourth sub-casing 44 are collectively referred to as sub-casings, and the heat insulating member is a heat insulating coating provided on the end surface of the sub-casing 4. Preferably, the heat insulating coating is also provided between the third sub-casing 43 and the fourth sub-casing 44. Since the heat insulating coating is provided on the end surface of the sub-casing, it will not extend into the aforementioned through hole 40.

[0049] Furthermore, the fourth sub-casing 44 is a heat-insulating casing made of a heat-insulating member, instead of providing a heat-insulating layer on the inner wall of the fourth sub-casing 44 , thereby simplifying the processing of the fourth sub-casing 44 .

[0050] As an embodiment, the projection of the sleeve 4 in the vertical plane is as follows: Figure 2 As shown in the figure, it can be seen that the projection of the sleeve 4 in the vertical plane is rectangular as a whole, that is, the first sub-sleeve 41, the second sub-sleeve 42, the third sub-sleeve 43 and the fourth sub-sleeve 44 are coaxially arranged, and the actual sleeve 4 is cylindrical. In the projection on the vertical plane, the two opposite ends of the third sub-sleeve 43 approach each other from bottom to top, the end faces of the second sub-sleeve 42 and the fourth sub-sleeve 44 facing the third sub-sleeve 43 are respectively matched with the two end faces of the third sub-sleeve 43, the end faces of the first sub-sleeve 41 and the second sub-sleeve 42 facing each other are matched, and the end face of the second sub-sleeve 42 facing away from the third sub-sleeve 43 is tilted toward the direction of the third sub-sleeve 43, so that the outer flame 21, the inner flame 22, and the flame core 23 of the flame sprayed by the flame spraying device 2 can enter the first sub-sleeve 41, the second sub-sleeve 42, and the third sub-sleeve 43 as much as possible to heat the optical fiber 8. In this embodiment, when the sleeve 4 is in the form of Figure 2 As shown, the heat insulating ring 46 is arranged at an angle with the length direction of the sleeve 4 .

[0051] Furthermore, if Figure 2 As shown, the angles between the inclined end faces of the first sub-tube 41, the second sub-tube 42, the third sub-tube 43 and the fourth sub-tube 44 and the horizontal plane are 1 to 18 degrees. In this way, the outer flame 21, the inner flame 22 and the flame core 23 of the flame sprayed by the flame-throwing device 2 can enter the first sub-tube 41, the second sub-tube 42 and the third sub-tube 43 as much as possible to heat the optical fiber 8.

[0052] Preferably, the ratio of the bottom lengths of the first sub-tube 41, the second sub-tube 42, and the third sub-tube 43 is 10:7:17, and the bottom lengths of the first sub-tube 41, the second sub-tube 42, and the third sub-tube 43 are matched as much as possible with the widths of the outer flame 21, the inner flame 22, and the flame core 23. In this way, the outer flame 21, the inner flame 22, and the flame core 23 of the flame sprayed by the flame-spraying device 2 can enter the first sub-tube 41, the second sub-tube 42, and the third sub-tube 43 as much as possible, respectively, to heat the optical fiber 8 and form a step cooling of the optical fiber.

[0053] In this example, the sleeve 4 is cylindrical, the diameter of the sleeve 4 is 300 μm to 5000 μm, the length of the sleeve 4 is 1 cm to 5 cm, and the total width of the flame sprayed by the flame spraying device 2 is 2 mm to 10 mm. Of course, the length and diameter of the sleeve 4 can also be set to other values ​​as needed, and are not specifically limited here, and can be selected according to actual needs. It is just necessary to emphasize that the optical fiber involved in the present invention is an optical fiber with a thinner diameter, and because the sleeve 4 will be roasted by the flame, it needs to have a certain high temperature resistance. The specific material is not described here, and the appropriate material can be selected according to the flame temperature of the flame spraying device 2.

[0054] Example 2

[0055] An optical fiber taper processing system, comprising a sleeve (such as Figure 2 and Figure 3 As shown), a feeding device and a tapering device, the feeding device and the tapering device are respectively located at two opposite sides of the length direction of the sleeve 4, and the moving speed of the optical fiber is 0.1mm / s to 2mm / s.

[0056] The optical fiber taper processing system provided in this embodiment has all the advantages of the sleeve of the aforementioned optical fiber taper processing system.

[0057] Example 3

[0058] A method for processing an optical fiber taper, based on the sleeve (such as Figure 2 and Figure 3 As shown), comprising the following steps:

[0059] Pass the optical fiber through the sleeve 4;

[0060] The flamethrower 2 is placed below the sleeve 4. Preferably, the lowest point of the sleeve 4 is 2 mm to 8 mm away from the top of the nozzle 20 of the flamethrower 2, and the size of the flame sprayed by the flamethrower 2 is adjusted (specifically, the size of the flame sprayed by the flamethrower 2 is adjusted by adjusting the size of the nozzle 20) so that the outer flame 21, inner flame 22 and flame core 23 of the flame sprayed by the flamethrower 2 correspond to the bottom of the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43 of the sleeve 4 respectively, and the fourth sub-sleeve 44 separates the optical fiber entering therein from the flame.

[0061] The optical fiber taper processing method provided in the present embodiment adopts the sleeve of the aforementioned optical fiber taper processing system, and the outer flame 21, inner flame 22 and flame core 23 of the flame sprayed by the flame spraying device 2 enter the first sub-sleeve 41, the second sub-sleeve 42 and the third sub-sleeve 43 from the flame inlet hole 45 at the bottom of the sleeve 4 to heat the optical fiber 8. The fourth sub-sleeve 44 separates the optical fiber 8 entering therein from the flame, and at least the inner wall of the fourth sub-sleeve 44 is a heat-insulating inner wall. Therefore, during the pulling process of the optical fiber, the optical fiber 8 will gradually pass through the first sub-sleeve 41 with the highest temperature corresponding to the outer flame 21, the second sub-sleeve 42 with the second lowest temperature corresponding to the inner flame 22, and the third sub-sleeve 43 with the third lowest temperature corresponding to the flame core 23, and then enter the fourth sub-sleeve 44. During the stretching process of the optical fiber 8, the optical fiber 8 will experience step-by-step cooling and will not directly enter the room temperature from the high temperature. The optical fiber 8 is not easy to bend and deform, and is even less likely to break, thereby ensuring the stability of the refraction of light by the optical fiber 8, and ultimately ensuring the quality of the optical fiber 8.

[0062] In a preferred solution, the flame spraying device 2 needs to be ventilated before ignition to achieve a better flame spraying effect.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A sleeve for an optical fiber taper processing system, characterized in that: The sleeve (4) is provided with a through hole (40) extending along its length direction. The sleeve (4) comprises a first sub-sleeve (41), a second sub-sleeve (42), a third sub-sleeve (43) and a fourth sub-sleeve (44) arranged in sequence along its length direction. A heat insulating member is sandwiched between the first sub-sleeve (41), the second sub-sleeve (42) and the third sub-sleeve (43). The bottoms of the first sub-sleeve (41), the second sub-sleeve (42) and the third sub-sleeve (43) are all provided with a fire inlet hole (45). At least the inner wall of the fourth sub-sleeve (44) is a heat insulating inner wall. The bottom of the fourth sub-sleeve (44) is in a closed state.

2. The sleeve of the optical fiber taper processing system according to claim 1, characterized in that: The fourth sub-casing (44) is a heat-insulating casing made of a heat-insulating material.

3. The sleeve of the optical fiber taper processing system according to claim 1, characterized in that: The heat insulating member is a heat insulating ring (46), the heat insulating ring (46) extends inwardly along the radial direction of the sleeve (4) into the through hole (40), and the central hole (461) of the heat insulating ring (46) is connected to the through hole (40) along the length direction of the sleeve (4); or, The first sub-casing (41), the second sub-casing (42), the third sub-casing (43) and the fourth sub-casing (44) are collectively referred to as sub-casings, and the thermal insulation component is a thermal insulation coating provided on the end surface of the sub-casing, and the thermal insulation coating is also provided between the third sub-casing (43) and the fourth sub-casing (44).

4. The sleeve of the optical fiber taper processing system according to claim 3, characterized in that: The heat insulation ring (46) is also provided between the third sub-casing (43) and the fourth sub-casing (44).

5. The sleeve of the optical fiber taper processing system according to claim 1, characterized in that: In terms of projection on a vertical plane, the two opposite end surfaces of the third sub-casing (43) approach each other from bottom to top, the end surfaces of the second sub-casing (42) and the fourth sub-casing (44) facing the third sub-casing (43) are respectively matched with the two end surfaces of the third sub-casing (43), the end surfaces of the first sub-casing (41) and the second sub-casing (42) facing each other are matched, and the end surface of the second sub-casing (42) facing away from the third sub-casing (43) is tilted in the direction of the third sub-casing (43).

6. The sleeve of the optical fiber taper processing system according to claim 5, characterized in that: The angle between the inclined end faces on the first sub-casing (41), the second sub-casing (42), the third sub-casing (43) and the fourth sub-casing (44) and the horizontal plane is 1 degree to 18 degrees.

7. The sleeve of the optical fiber taper processing system according to claim 6, characterized in that: The ratio of the lengths of the bottoms of the first sub-casing (41), the second sub-casing (42), and the third sub-casing (43) is 10:7:

17.

8. An optical fiber taper processing system, characterized in that: The optical fiber taper processing system comprises a sleeve, a feeding device and a taper device according to any one of claims 1 to 7, wherein the feeding device and the taper device are respectively located at two opposite sides of the sleeve (4) in the length direction.

9. A method for processing optical fiber taper, based on the sleeve of the optical fiber taper processing system according to any one of claims 1 to 7, characterized in that: The steps include: Passing the optical fiber (8) through the through hole (40) of the sleeve (4); The flame-throwing device (2) is placed below the sleeve (4), so that the outer flame (21), the inner flame (22) and the flame core (23) of the flame sprayed by the flame-throwing device (2) respectively enter the first sub-sleeve (41), the second sub-sleeve (42) and the third sub-sleeve (43) of the sleeve (4) from the corresponding fire inlet holes (45) on the bottom of the sleeve (4), and the fourth sub-sleeve (44) separates the optical fiber (8) entering therein from the flame.

10. The optical fiber taper processing method according to claim 9, characterized in that: The distance between the lowest point of the sleeve (4) and the top of the nozzle (20) of the flame-spraying device (2) is 2 mm to 8 mm.

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