Laser fiber drawing furnace for manufacturing hollow-core optical fiber and manufacturing method of hollow-core optical fiber

Abstract

The invention provides a laser fiber drawing furnace for manufacturing a hollow-core optical fiber and a manufacturing method of the hollow-core optical fiber, the fiber drawing furnace comprises a furnace shell, and a plurality of laser light sources and light path adjusting modules which surround a hollow-core optical fiber preform and are correspondingly arranged, and the laser light sources and the light path adjusting modules are fixed on the furnace shell. According to the invention, the laser is used as a heat source to realize the manufacturing of the hollow-core optical fiber, and the structural consistency and uniformity of the hollow-core optical fiber are improved.

Description

Technical Field

[0001] The invention relates to the technical field of hollow core optical fiber manufacturing equipment, and in particular to a laser drawing furnace used for hollow core optical fiber manufacturing and a hollow core optical fiber manufacturing method. Background Art

[0002] Since its birth, hollow-core optical fiber has surpassed the transmission loss of traditional solid-core optical fiber in the ultraviolet to 2 micron band. Because it uses air as the core to guide light, it also has the advantages of low latency, low dispersion, low nonlinearity and high laser damage threshold, and is expected to become the ultimate medium for light wave energy transmission. It has great application prospects in large-capacity data communications, high-power laser transmission and sensing. In order to ensure the ultra-low loss and single-mode transmission performance of hollow-core optical fiber, various complex structures have been designed and developed. Hollow-core optical fiber is generally prepared by stacking method, and the preform rod with a specific arrangement of capillaries is stretched into an intermediate, and then the sleeve is drawn. During drawing, the furnace temperature, air pressure and other parameters are controlled to achieve the preparation of the target structure. The furnace temperature is generally controlled by the same heating element as the traditional solid-core optical fiber. The heating element is made of graphite and is a hollow cylinder that can surround the preform rod in the center. It can only be heated as a whole and cannot achieve a certain precision of regional temperature control.

[0003] The yield of hollow-core optical fibers with excellent optical performance is very low. This is because the lower the transmission loss of the hollow-core optical fiber, the more complex its internal microstructure is, and the more difficult it is to control the structure during drawing. Taking the three-layer hollow-core antiresonant optical fiber as an example, it generally contains 5 three-layer nested cladding elements. When the following conditions exist, the uniformity of the three-layer nested structure begins to get out of control, seriously reducing the transmission performance of the finished optical fiber. 1. The temperature field inside the drawing furnace is unevenly distributed, causing uneven heating of each microstructure element during optical fiber drawing, resulting in inconsistent sensitivity to air pressure, resulting in large and small holes, affecting the consistency of wall thickness and air layer size; 2. The preform rod is not 100% vertical to the horizontal plane of the drawing furnace when it is supported, and it is difficult to achieve complete alignment in actual situations. At this time, the preform rod is tilted in the hot zone of the furnace, resulting in uneven heating; 3. There is an uneven phenomenon in each element of the microstructure cladding of the preform rod itself, and the size reduction during drawing will further amplify the defects. In addition, due to the surface tension of the molten glass during drawing, there are thermally excited capillary waves on the microstructure surface. When the glass solidifies, these surface capillary waves will be frozen to produce inherent surface roughness, which will increase the surface scattering loss of the hollow-core optical fiber.

[0004] The prior art discloses a laser drawing tower for special optical fiber drawing, which uses laser as a heat source for drawing. A rod feeding system and an auxiliary traction system are arranged on the tower, and the drawing tower also includes a control system, a first cooling system, a laser diameter measuring system, an optical fiber coating system, an ultraviolet lamp and a winding system. The rod feeding system and the laser diameter measuring system are electrically connected to the control system.

[0005] Although the above scheme proposes to use laser as the heat source for drawing, it only replaces the graphite parts of the traditional drawing furnace. Other contents are no different from the conventional drawing tower. Its light source only includes a single laser light source, and there is no optical structure to adjust the output laser. Therefore, it is not suitable for the production of hollow-core optical fibers with complex structures and high requirements for structural uniformity and consistency. Summary of the invention

[0006] The object of the present invention is to provide a laser drawing furnace for hollow core optical fiber manufacturing and a hollow core optical fiber manufacturing method to meet the production requirements of hollow core optical fiber with uniform structure.

[0007] In order to solve the above technical problems, the present invention provides a laser drawing furnace for hollow-core optical fiber manufacturing, a laser drawing furnace for hollow-core optical fiber manufacturing, comprising a furnace shell, and a plurality of laser light sources and optical path adjustment modules arranged correspondingly around the hollow-core optical fiber preform rod, wherein the laser light source and the optical path adjustment module are fixed on the furnace shell; When making hollow-core optical fiber, the hollow-core optical fiber preform is vertically inserted into the furnace shell, the laser light source emits laser for melting the hollow-core optical fiber preform, the optical path adjustment module folds and processes the laser emitted by the laser light source and then shoots it toward the hollow-core optical fiber preform. The hollow-core optical fiber preform melts and falls under the heating of lasers in different directions and is drawn to form a hollow-core optical fiber.

[0008] According to the above scheme, the optical path adjustment module includes an optical path adjustment module shell, an entrance reflector and a melting optical path component. The entrance reflector is arranged at the opening of the optical path adjustment module shell, and the melting optical path component is arranged in the optical path adjustment module shell. After the laser enters the optical path adjustment module, it is reflected by the entrance reflector and enters the melting optical path component, and then passes through the melting optical path component to be emitted to the hollow core optical fiber preform rod.

[0009] According to the above scheme, the melting optical path component includes a first lens, a second lens, and a first plane mirror arranged along the laser propagation direction.

[0010] According to the above scheme, the melting optical path assembly includes a first slide rail, the first lens and the second lens are both slidably connected to the first slide rail through a support rod and an electric displacement platform, and the first plane mirror is fixed to the optical path adjustment module housing.

[0011] According to the above scheme, the laser light source can generate lasers of the first wavelength and the second wavelength at the same time, and the optical path adjustment module includes a polishing optical path component and a transflective mirror; the entrance reflector can reflect the lasers of the first wavelength and the second wavelength at the same time, the laser of the first wavelength is reflected by the entrance reflector and then transmitted through the transflective mirror, and then passes through the melting optical path component and then is emitted to the hollow core optical fiber preform and melts the hollow core optical fiber preform, the laser of the second wavelength is reflected by the entrance reflector and then reflected by the transflective mirror, and then passes through the polishing optical path component and is emitted to the hollow core optical fiber and polishes the hollow core optical fiber.

[0012] According to the above scheme, the polishing optical path component includes a reflector, a beam expander, an aperture, a shaping mirror, a third lens, a fourth lens, and a second plane mirror arranged along the propagation direction of the laser of the second wavelength.

[0013] According to the above scheme, the reflective mirror is connected to the second slide rail through an adapter and a support rod; the polishing optical path assembly includes the second slide rail, the reflector, the beam expander, the diaphragm, and the shaping mirror are all connected to the second slide rail through a support rod, the third lens and the fourth lens are both slidably connected to the second slide rail through a support rod and an electric displacement platform, and the second plane mirror is fixed to the optical path adjustment module housing.

[0014] According to the above scheme, a first water cooling pipeline and a second water cooling pipeline are included; the first water cooling pipeline cools the laser light source, and the second water cooling pipeline cools the furnace shell and optical path adjustment module.

[0015] According to the above scheme, the number of laser light sources and optical path adjustment modules is greater than or equal to 3.

[0016] The present invention also provides a method for manufacturing a hollow-core optical fiber, which is implemented using the laser drawing furnace for manufacturing hollow-core optical fibers described above, and includes: controlling the output power of the laser light source and the position of the optical element in the optical path adjustment module to perform zone control on the heating effect of different laser irradiation locations on the hollow-core optical fiber preform.

[0017] Beneficial Effects The present invention realizes multi-directional laser heating of a hollow-core optical fiber preform by arranging multiple laser light sources and optical path adjustment modules, and can ensure the geometric uniformity of heating, melting and drawing of the hollow-core optical fiber by adjusting the power of different laser light sources and controlling different optical path adjustment modules.

[0018] Furthermore, the present invention also provides a laser light source capable of emitting two different wavelengths and a polishing optical path component. The second wavelength laser generated by the laser light source is irradiated onto the hollow-core optical fiber after passing through the polishing optical path component, thereby achieving surface polishing of the internal microstructure of the hollow-core optical fiber, thereby reducing the surface scattering loss of the hollow-core optical fiber and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a laser drawing furnace for manufacturing hollow core optical fiber according to the first embodiment of the present invention; Figure 2 This is a structural diagram of an optical path adjustment module according to Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of a hollow core optical fiber preform according to Embodiment 1 of the present invention being heated by a laser of a first wavelength; Figure 4This is a schematic diagram of the microstructure in the hollow core optical fiber of the first embodiment of the present invention being polished by a laser of a second wavelength.

[0020] In the figure: 1-hollow core optical fiber preform, 2-necking area, 3-hollow core optical fiber, 4-laser light source, 5-first power supply and drive line, 6-first water cooling pipeline, 7-furnace shell, 8-second water cooling pipeline, 9-outer ring, 10-screw, 11-optical path adjustment module, 12-second power supply and drive line, 13-entrance reflector, 14-first plane mirror, 15-second plane mirror, 16-transmissive mirror, 17-adapter, 1801-first lens, 1802-second lens, 19-reflector, 20-beam expander, 21-aperture, 22-shaping mirror, 2301-third lens, 2302-fourth lens, 25-electric displacement platform, 26-support rod, 27-sleeve, 28-intermediate, 29-first wavelength laser, 30-second wavelength laser, 31-microstructure, 32-air. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0022] Embodiment 1: Hollow-core fiber refers to a special fiber that does not satisfy total internal reflection and uses air 32 as the core cladding and may contain microstructures. Hollow-core antiresonant fiber is currently the most common hollow-core fiber. The light-guiding principle follows the antiresonant reflection optical waveguide model: λ=(4t / (2m-1))*√(n^2-1). λ is the operating wavelength, t is the microstructure wall thickness, n is the refractive index of the microstructure material, and m is a constant ≥1.

[0023] In order to solve the problem that the drawing furnace in the prior art is unevenly heated, resulting in poor consistency and uniformity of the drawn optical fiber structure, and cannot meet the production requirements of hollow-core optical fibers, this embodiment discloses a laser drawing furnace for hollow-core optical fiber manufacturing, see Figure 1 , Figure 2 , including a furnace shell 7, and a plurality of laser light sources 4 and optical path adjustment modules 11 arranged correspondingly around the hollow core optical fiber preform rod 1, the laser light source 4 and the optical path adjustment module 11 are both fixed on the furnace shell 7 (in this embodiment, the laser light source 4 and the optical path adjustment module 11 are both fixed on the furnace shell 7 by screws 10); When making a hollow-core optical fiber, a hollow-core optical fiber preform 1 (the hollow-core optical fiber preform 1 includes a sleeve 27 located on the outer layer and an intermediate body 28 located on the inner layer) is vertically inserted into the furnace shell 7, and a laser light source 4 emits a laser for melting the hollow-core optical fiber preform 1. The optical path adjustment module 11 folds and processes the laser emitted by the laser light source 4 and then emits it to the hollow-core optical fiber preform 1. The hollow-core optical fiber preform 1 melts and falls under the heating of lasers in different directions (the melting and falling area is the necking area 2) and is drawn to form a hollow-core optical fiber 3.

[0024] It should be understood that the laser light source 4 and the optical path adjustment module 11 are both electrically connected to the power supply and to the control module (in this embodiment, the laser light source 4 is connected to the power supply and control module via the first power supply and the drive line 5, and the optical path adjustment module 11 is connected to the power supply and the control module via the second power supply and the drive line 12), and the control module is used to electrically adjust the output power of the laser light source 4 and the position of the optical element in the optical path adjustment module 11.

[0025] In this embodiment, the hollow core optical fiber preform 1 has a hollow core inside and is drawn by the sleeve method.

[0026] In this embodiment, the laser light source 4 is vertical and has an outer ring 9 on the side, which is fixed to the top of the furnace shell 7 by screws 10, which is easy to assemble, disassemble and maintain; different laser light sources 4 share a power supply. The optical path adjustment module 11 is correspondingly arranged below the laser light source 4, and the optical path adjustment module 11 is fixed to the bottom of the furnace shell 7 by screws 10, which is easy to disassemble and assemble, and the optical elements inside it can be replaced or the entire optical system inside it can be maintained according to actual needs.

[0027] Furthermore, the optical path adjustment module 11 includes an optical path adjustment module shell, an entrance reflector 13 and a melting optical path component. The entrance reflector 13 is arranged at the opening of the optical path adjustment module shell (the entrance reflector 13 can be turned outward or closed as needed. When turned outward, the incident laser is reflected into the optical path adjustment module shell. When closed, the optical path adjustment module shell forms a closed structure to prevent external contaminants from entering), and the melting optical path component is arranged in the optical path adjustment module shell; after the laser enters the optical path adjustment module 11, it is reflected by the entrance reflector 13 and enters the melting optical path component, and then passes through the melting optical path component to be emitted to the hollow core optical fiber preform 1.

[0028] Furthermore, the ablation optical path assembly includes a first lens 1801, a second lens 1802, and a first plane mirror 14 arranged along the laser propagation direction.

[0029] Furthermore, the melting optical path assembly includes a first slide rail, the first lens 1801 and the second lens 1802 are both slidably connected to the first slide rail through a support rod 26 and an electric displacement platform 25, and the first plane mirror 14 is fixed to the optical path adjustment module housing.

[0030] Furthermore, the laser light source 4 can generate lasers of the first wavelength and the second wavelength at the same time, and the optical path adjustment module 11 includes a polished optical path component and a transflective mirror 16; the entrance reflector 13 can reflect the lasers of the first wavelength and the second wavelength at the same time (in this embodiment, the entrance reflector 13 is a gold mirror), and the laser 29 of the first wavelength is reflected by the entrance reflector 13 and then transmitted through the transflective mirror 16, and then passes through the melting optical path component and is emitted to the hollow core optical fiber preform 1 and melts the hollow core optical fiber preform 1 (see Figure 3 ), the laser light 30 of the second wavelength is reflected by the entrance reflector 13 and then by the reflector 16, and then passes through the polishing optical path component to be emitted to the hollow core optical fiber 3 and polish the hollow core optical fiber 3 (see Figure 4 ).

[0031] It should be understood that the first wavelength laser 29 used for melting the hollow-core optical fiber can be absorbed by the hollow-core optical fiber material, and the second wavelength laser 30 used for polishing the microstructure surface inside the hollow-core optical fiber cannot be absorbed by the hollow-core optical fiber material. In this embodiment, the material of the hollow-core optical fiber is quartz glass. Accordingly, the first wavelength laser 29 is a CO2 laser (with a wavelength of 10.6 microns) and is a continuous laser. The second wavelength laser 30 is a 1 micron laser and is a picosecond or femtosecond ultrafast laser. The first wavelength laser source and the second wavelength laser source can be respectively controlled online in power by an external control module. In other embodiments, the material of the hollow-core optical fiber can also be chalcogenide glass, fluoride glass, plastic, crystal, etc. In this embodiment, the hollow-core optical fiber is a hollow-core antiresonant optical fiber. In other embodiments, the hollow-core optical fiber can also be a hollow-core photonic bandgap optical fiber, a hollow-core Bragg optical fiber, a hollow-core capillary optical fiber, etc.

[0032] Furthermore, the polishing optical path component includes a reflector 19, a beam expander 20, an aperture 21, a shaping mirror 22, a third lens 2301, a fourth lens 2302, and a second plane mirror 15, which are arranged along the propagation direction of the laser 30 of the second wavelength; wherein the beam expander 20 broadens the energy of the laser spot, the aperture 21 filters the stray light at the edge of the laser spot, and the shaping mirror 22 changes the shape of the spot. In a preferred embodiment of the present invention, the Gaussian spot with concentrated energy distribution is transformed into a flat-top spot with uniform energy distribution through the beam expander 20, the aperture 21, and the shaping mirror 22.

[0033] Furthermore, the reflective mirror 16 is connected to the second slide rail through the adapter 17 and the support rod 26; the polishing optical path assembly includes the second slide rail, the reflector 19, the beam expander 20, the aperture 21, and the shaping mirror 22 are all connected to the second slide rail through the support rod 26, the third lens 2301 and the fourth lens 2302 are both slidably connected to the second slide rail through the support rod 26 and the electric displacement platform 25, and the second plane mirror 15 is fixed to the optical path adjustment module housing.

[0034] In this embodiment, the control module can change the position of the first lens 1801 and the second lens 1802 (or the third lens 2301 and the fourth lens 2302) by controlling the position of the electric displacement platform 25 on the first slide rail (or the second slide rail), thereby changing the focal position of the laser beam of the first wavelength (or the second wavelength), and adjusting the spot size of the laser beam of the first wavelength (or the second wavelength). It is understandable that the first lens 1801 and the second lens 1802 (or the third lens 2301 and the fourth lens 2302) can also be replaced to adapt to different sizes of the hollow core optical fiber preform 1; the materials of the optical elements in the optical path adjustment module 11 are selected according to the wavelength of the laser light source 4.

[0035] In this embodiment, the external control module can independently control each slide rail and each electric displacement platform 25 in each optical path adjustment module housing.

[0036] Furthermore, it includes a first water-cooling pipeline 6 and a second water-cooling pipeline 8; the first water-cooling pipeline 6 cools the laser light source 4, and the second water-cooling pipeline 8 cools the furnace shell 7 and the optical path adjustment module 11; in this embodiment, different laser light sources 4 share the first water-cooling pipeline 6 for cooling.

[0037] Furthermore, the number of laser light sources 4 and optical path adjustment modules 11 is greater than or equal to 3; it should be understood that the number of laser light sources 4 and optical path adjustment modules 11 should ensure that the hollow-core optical fiber preform 1 can receive sufficient laser irradiation to completely melt it. In a preferred embodiment of the present invention, the number of laser light sources 4 and optical path adjustment modules 11 is 4, and they are evenly distributed around the hollow-core optical fiber preform 1.

[0038] The application of the wire drawing furnace described in this embodiment has at least the following effects: 1. Use light source instead of heat source for wire drawing, no need to use heating element to provide heat, no need to consume graphite parts, no need to use inert protective gas; 2. It can control the laser power irradiated to the surface of the preform rod with high precision and in different regions. When drawing, the laser power can be determined by changing the barrel and observing the end face of the microstructure to determine which area needs to increase / decrease the laser power. Equivalently, the surface tension of each part of the microstructure, that is, the air pressure sensitivity, is changed online during drawing. When the air pressure of each part of the microstructure is fixed, the cladding elements expand, collapse, and deform in an equal trend. This solves the problem of difficulty in controlling the hollow-core optical fiber drawing structure; 3. Capable of using ultrashort pulse laser to polish the capillary waves frozen on the surface of hollow-core optical fiber microstructures, reducing the roughness of the glass surface (through nonlinear processes such as multiphoton absorption, avalanche and impact ionization), thereby reducing the surface scattering loss of hollow-core optical fibers; 4. The wire drawing furnace is assembled from the light source, the optical path device and the furnace shell 7. The overall structure is stable and has a high earthquake resistance. The various parts of the wire drawing furnace can be disassembled and assembled, and the light source and the optical path device are easy to maintain and replace key components; 5. By changing the wavelength of the light source, it can adapt to the continuous and uninterrupted drawing of hollow-core optical fibers made of different matrix materials; 6. The laser light source 4 and the optical path adjustment module 11 surrounding the preform are both externally connected to a drive control system, and an operator can remotely control a single laser light source 4 or optical path adjustment module 11.

[0039] Embodiment 2: The present embodiment discloses a method for manufacturing a hollow-core optical fiber, which is implemented based on the laser drawing furnace for manufacturing hollow-core optical fiber described in Example 1, and includes: controlling the output power of the laser light source 4 and the position of the optical element in the optical path adjustment module 11, thereby performing zone control on the heating effect of different laser irradiation locations on the hollow-core optical fiber preform rod 1.

[0040] The method independently controls different laser light sources 4 and optical path adjustment modules 11, thereby achieving regional control of microstructure surface tension and air pressure sensitivity inside the hollow-core optical fiber, thereby achieving the preparation of a hollow-core optical fiber with uniform structure.

[0041] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser drawing furnace for hollow core optical fiber manufacturing, characterized in that: It includes a furnace shell, and a plurality of laser light sources and optical path adjustment modules which are arranged correspondingly around the hollow-core optical fiber preform rod, and the laser light source and the optical path adjustment module are both fixed on the furnace shell; When making hollow-core optical fiber, the hollow-core optical fiber preform is vertically inserted into the furnace shell, the laser light source emits laser for melting the hollow-core optical fiber preform, the optical path adjustment module folds and processes the laser emitted by the laser light source and then shoots it toward the hollow-core optical fiber preform. The hollow-core optical fiber preform melts and falls under the heating of lasers in different directions and is drawn to form a hollow-core optical fiber.

2. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 1, characterized in that: The optical path adjustment module comprises an optical path adjustment module housing, an entrance reflector and a melting optical path component, wherein the entrance reflector is arranged at the opening of the optical path adjustment module housing, and the melting optical path component is arranged in the optical path adjustment module housing; After entering the optical path adjustment module, the laser is reflected by the entrance reflector and enters the melting optical path component, and then passes through the melting optical path component and is emitted to the hollow core optical fiber preform.

3. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 2, characterized in that: The melting optical path component comprises a first lens, a second lens and a first plane mirror which are arranged along the laser propagation direction.

4. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 3, characterized in that: The melting optical path component comprises a first slide rail, a first lens and a second lens are both slidably connected to the first slide rail through a support rod and an electric displacement platform, and a first plane mirror is fixed to a housing of an optical path adjustment module.

5. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 2, characterized in that: The laser light source can generate lasers of a first wavelength and a second wavelength simultaneously, and the optical path adjustment module includes a polishing optical path component and a transflective mirror; the entrance reflector can reflect the lasers of the first wavelength and the second wavelength simultaneously, the laser of the first wavelength is reflected by the entrance reflector and then transmitted through the transflective mirror, and then passes through the melting optical path component and is emitted to the hollow core optical fiber preform and melts the hollow core optical fiber preform, the laser of the second wavelength is reflected by the entrance reflector and then reflected by the transflective mirror, and then passes through the polishing optical path component and is emitted to the hollow core optical fiber and polishes the hollow core optical fiber.

6. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 5, characterized in that: The polishing optical path component comprises a reflecting mirror, a beam expander, an aperture, a shaping mirror, a third lens, a fourth lens and a second plane mirror which are arranged along the propagation direction of the laser of the second wavelength.

7. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 6, characterized in that: The reflective mirror is connected to the second slide rail through an adapter and a support rod; the polishing optical path assembly includes the second slide rail, the reflector, the beam expander, the diaphragm, and the shaping mirror are all connected to the second slide rail through a support rod, the third lens and the fourth lens are both slidably connected to the second slide rail through a support rod and an electric displacement platform, and the second plane mirror is fixed to the optical path adjustment module housing.

8. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 1, characterized in that: It includes a first water cooling pipeline and a second water cooling pipeline; the first water cooling pipeline cools the laser light source, and the second water cooling pipeline cools the furnace shell and optical path adjustment module.

9. The laser drawing furnace for hollow core optical fiber manufacturing according to claim 1, characterized in that: The number of laser light sources and optical path adjustment modules is greater than or equal to 3.

10. A method for manufacturing a hollow core optical fiber, characterized in that: The method is implemented using the laser drawing furnace for hollow-core optical fiber manufacturing as described in any one of claims 1 to 9, and includes: controlling the output power of the laser light source and the position of the optical element in the optical path adjustment module to perform zone control on the heating effect of different laser irradiation locations on the hollow-core optical fiber preform.

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