Manufacturing process and manufacturing device of carbon-coated optical fiber

Abstract

The invention provides a manufacturing process and device of a carbon coating optical fiber. The manufacturing process of the carbon coating optical fiber comprises the following steps: coating the surface of a bare optical fiber and forming a first coating; carbonizing the first coating in an inert gas environment so as to convert the first coating into a carbon coating; and coating the surface of the carbon coating and forming a second coating. According to the technical scheme, the problem that when the carbon-coated optical fiber is produced by adopting the mode in the prior art, the reaction gas may be burnt and exploded under the hot oxygen condition can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber manufacturing, and in particular to a manufacturing process and a manufacturing device for a carbon coated optical fiber. Background Art

[0002] Carbon-coated optical fiber has good sealing properties and can block water vapor, hydrogen and corrosive gases. It is suitable for environments with high irradiation, high temperature and high humidity. It can significantly extend the service life of optical fiber and has broad application prospects in nuclear facilities, outer space, oil and gas mines and other fields. At present, foreign optical fiber manufacturers mainly use thermal CVD process to produce carbon-coated optical fiber. The specific process is as follows: the bare optical fiber enters the carbon-coated thermal reactor with reaction gas (methane, acetylene, ethylene, propylene, butadiene and benzene, etc.). The reaction gas is thermally cracked on the surface of the optical fiber to form an amorphous carbon film, which is then cooled by a cooling tube and finally wound after secondary organic coating. However, when the existing technology is used to produce carbon-coated optical fiber, the reaction gas may explode under hot oxygen conditions. Summary of the invention

[0003] The main purpose of the present invention is to provide a manufacturing process and a manufacturing device for a carbon coated optical fiber, which can solve the problem that when the carbon coated optical fiber is produced by the prior art, the reaction gas may explode under hot oxygen conditions.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, a process for manufacturing a carbon-coated optical fiber is provided, and the process for manufacturing a carbon-coated optical fiber comprises: coating the surface of a bare optical fiber and forming a first coating; carbonizing the first coating in an inert gas environment to convert the first coating into a carbon coating; coating the surface of the carbon coating and forming a second coating.

[0005] Furthermore, the first raw material for forming the first coating layer is an organic polymer material.

[0006] Furthermore, the first raw material for forming the first coating layer is selected from one or more of polyimide, phenolic resin, and polyacrylonitrile.

[0007] Further, the concentration of the first raw material for forming the first coating layer ranges from 1% to 10%; and / or the thickness of the first coating layer ranges from 0.1 μm to 10 μm.

[0008] Furthermore, the step of coating the surface of the bare optical fiber and forming a first coating includes: coating the surface of the bare optical fiber with a first raw material; curing the bare optical fiber coated with the first raw material through a curing device to form a first coating, and the heating temperature of the curing device ranges from 200°C to 400°C.

[0009] Furthermore, the bare optical fiber coated with the first raw material is sequentially passed through at least two curing devices for curing and forming a first coating, wherein along the conveying direction of the bare optical fiber, the heating temperature of at least two curing devices gradually increases, and the temperature difference between two adjacent curing devices ranges from 50°C to 100°C.

[0010] Furthermore, the step of carbonizing the first coating and forming a carbon coating includes: passing the bare optical fiber coated with the first coating through the inner cavity of a carbonizing device for carbonization so that the first coating is converted into a carbon coating, wherein an inert gas is passed through the inner cavity of the carbonizing device, and the heating temperature of the carbonizing device is in the range of 500°C to 1200°C.

[0011] Furthermore, the bare optical fiber coated with the first coating is sequentially carbonized through at least two carbonization devices to convert the first coating into a carbon coating, wherein the heating temperatures of at least two carbonization devices gradually increase along the conveying direction of the bare optical fiber, and the temperature difference between two adjacent carbonization devices ranges from 50°C to 200°C.

[0012] Furthermore, the second raw material for forming the second coating layer is selected from one or more of polyimide, silicone resin, and polyurethane.

[0013] Furthermore, the step of coating the surface of the carbon coating and forming a second coating includes: coating the surface of the carbon coating with a second raw material; and curing the bare optical fiber coated with the second raw material to form a second coating.

[0014] According to another aspect of the present invention, there is also provided a device for manufacturing a carbon-coated optical fiber, which is used to implement the manufacturing process of the carbon-coated optical fiber as described above, and the device for manufacturing the carbon-coated optical fiber comprises: a fiber-releasing device for releasing a bare optical fiber; at least two coating devices, the fiber-releasing device and the at least two coating devices being arranged in sequence and spaced apart along the conveying direction of the bare optical fiber; and a carbonizing device, the carbonizing device being located between a coating device for coating to form a first coating and a coating device adjacent to the coating device, the carbonizing device having an inner cavity, the inner cavity being configured for the bare optical fiber to pass through, and the inner cavity being passed with an inert gas.

[0015] Furthermore, the manufacturing device of the carbon coated optical fiber also includes at least two curing devices, the at least two coating devices and the at least two curing devices are arranged in a one-to-one correspondence, and the curing device is located at the discharge side of the corresponding coating device.

[0016] Furthermore, the carbonization device is provided with an air inlet and an air outlet communicated with the inner cavity, and along the conveying direction of the bare optical fiber, the air inlet and the air outlet are arranged on opposite sides of the carbonization device.

[0017] By applying the technical solution of the present invention, the surface of the bare optical fiber is coated and a first coating is formed. The carbonization process of the first coating is carried out in an inert gas environment, that is, the carbonization reaction is carried out in an oxygen-free environment, which can avoid the combustion or explosion caused by the contact of volatile organic matter produced by the decomposition of the first coating with oxygen. A second coating is also coated on the surface of the carbonized layer to protect the carbonized layer and improve the mechanical strength of the finished optical fiber. As can be seen from the above, compared with the prior art that uses reaction gases (methane, acetylene, ethylene, propylene, butadiene and benzene, etc.) to thermally decompose on the optical fiber surface to form an amorphous carbon film, the present application coats a first coating on the outer surface of the bare optical fiber and carbonizes it to form a carbonized layer. The process of forming the carbonized layer is carried out in an inert gas environment, and there is no need to introduce flammable reaction gases to make the reaction gases react with oxygen and form a carbon film on the optical fiber surface. Therefore, the problem of combustion and explosion during the production of carbon-coated optical fibers can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A process flow chart showing the manufacturing process of a carbon coated optical fiber according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic structural diagram of a device for manufacturing a carbon-coated optical fiber according to an embodiment of the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Bare optical fiber; 20. Fiber laying device; 30. Coating device; 40. Carbonization device; 41. Furnace body; 42. Air inlet pipe; 43. Air outlet pipe; 50. Curing device; 60. Wire diameter gauge; 70. Fiber collecting device; 80. First guide part; 90. Second guide part. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] like Figure 1 As shown, the present invention provides a manufacturing process for a carbon-coated optical fiber, and the manufacturing process for a carbon-coated optical fiber includes: coating the surface of a bare optical fiber 10 to form a first coating; carbonizing the first coating in an inert gas environment to convert the first coating into a carbon coating; coating the surface of the carbon coating to form a second coating.

[0025] In this embodiment, the carbonization process of the first coating is carried out in an inert gas environment, that is, the carbonization reaction is carried out in an oxygen-free environment, which can avoid combustion or explosion caused by contact between volatile organic matter produced by the decomposition of the first coating and oxygen. The inert gas provides a safe isolation layer for the carbonization process, ensuring the stability and safety of the entire process, and a second coating is also coated on the surface of the carbonized layer to protect the carbonized layer and improve the mechanical strength of the finished optical fiber. As can be seen from the above, the manufacturing process of the carbon-coated optical fiber of the present application is simple and efficient. The first coating is carbonized in an inert gas environment to convert the first coating into a carbonized layer. The process of forming the carbonized layer is carried out in an inert gas environment. Compared with the production method of the prior art, there is no need to introduce flammable reaction gas to make the reaction gas react with oxygen and form a carbon film on the surface of the optical fiber. Therefore, the problem of combustion and explosion during the production process of the carbon-coated optical fiber can be avoided.

[0026] In one embodiment, the inert gas is argon or nitrogen.

[0027] In one embodiment of the present invention, the first raw material for forming the first coating layer is an organic polymer material.

[0028] In this embodiment, organic polymer materials (such as polyimide) are used as precursors for the carbon coating, which significantly reduces the risk of explosion during the production process compared to the prior art method of using flammable gases such as methane and acetylene. This is because the gases generated by the decomposition of polymer materials at high temperatures are not easy to react with oxygen to cause combustion or explosion even under heating conditions, and the carbonization process of the present application is carried out in an inert gas environment, which can further ensure the safety of the carbonization process. The use of organic polymer materials as coating raw materials has stable chemical properties and is not easy to decompose to generate a large amount of carbon powder, which can avoid blockage of the reaction chamber and ensure the continuous length of the carbon-coated optical fiber.

[0029] In one embodiment of the present invention, the first raw material for forming the first coating layer is selected from one or more of polyimide, phenolic resin, and polyacrylonitrile.

[0030] In this embodiment, polyimide has excellent thermal stability and can maintain its structural integrity at high temperatures, which enables it to form a stable carbon coating without degradation during the subsequent high-temperature carbonization process, so that the carbon coating has good sealing and mechanical strength, extending the service life of the optical fiber. Phenolic resin has high heat resistance and chemical resistance, and can protect the optical fiber from high temperature and chemical corrosion to a certain extent. Polyacrylonitrile can be converted into a carbon coating with a high carbon content during the carbonization process, which is conducive to improving the stability of the carbon coating.

[0031] Preferably, the polyimide is a highly oriented planar polyimide prepared by condensation polymerization using pyromellitic anhydride and 4,4'-diaminodiphenyl ether as monomers, that is, a polyimide with oriented polymer chains. This orientation helps to improve the density and uniformity of the coating and better protect the optical fiber from external environmental factors such as water vapor, hydrogen and corrosive gases, thereby extending its service life. The highly oriented planar polyimide has a planar molecular structure. This structural feature can enhance the thermal stability and chemical stability of the coating material. The planar structure reduces the interaction between molecules, making the polyimide less likely to decompose at high temperatures.

[0032] In one embodiment of the present invention, the concentration of the first raw material for forming the first coating layer ranges from 1% to 10%.

[0033] Through the above arrangement, it can be ensured that the thickness of the carbonized layer formed after the first coating is carbonized is appropriate.

[0034] In one embodiment of the present invention, the thickness of the first coating layer ranges from 0.1 μm to 10 μm.

[0035] In this embodiment, the thickness of the first coating is set in the range of 0.1 μm to 10 μm, which can ensure the sealing and protective functions of the first coating, and at the same time, can also ensure the tensile and bending resistance of the optical fiber and extend the service life of the optical fiber.

[0036] In one embodiment of the present invention, the step of coating the surface of the bare optical fiber 10 and forming a first coating includes: coating the surface of the bare optical fiber 10 with a first raw material; curing the bare optical fiber 10 coated with the first raw material through a curing device 50 to form a first coating, and the heating temperature of the curing device 50 is in the range of 200°C to 400°C.

[0037] In this embodiment, the step of coating the first raw material ensures that the coating material can evenly cover the surface of the bare optical fiber 10 to form a protective film. The curing process heats the coating material to transform from a liquid state to a solid state, and then closely combines with the surface of the bare optical fiber to form a first coating. The temperature range of 200°C to 400°C can promote the full reaction and curing of the coating material, ensuring the integrity, uniformity and bonding strength of the first coating with the bare optical fiber.

[0038] In one embodiment of the present invention, a bare optical fiber 10 coated with a first raw material is sequentially passed through at least two curing devices 50 for curing and forming a first coating, wherein along the conveying direction of the bare optical fiber 10, the heating temperature of at least two curing devices 50 gradually increases, and the temperature difference between two adjacent curing devices 50 ranges from 50°C to 100°C.

[0039] In this embodiment, the curing process of gradually increasing the temperature helps to distribute and cure the coating raw materials more evenly. The lower starting temperature can ensure the initial adhesion and initial cross-linking of the coating material on the surface of the bare optical fiber. As the temperature gradually increases, the chemical reaction of the coating material is accelerated to form a denser and more uniform first coating.

[0040] The above-mentioned segmented heating and curing method can avoid the problem of bubbles and cracks on the surface of the first coating layer caused by direct high-temperature curing. The temperature difference between two adjacent curing devices 50 is controlled within the range of 50°C to 100°C, so that the coating material gradually adapts to the temperature change, reduces the stress concentration caused by excessive temperature gradient, and ensures the stability of the first coating layer.

[0041] In one embodiment of the present invention, the step of carbonizing the first coating and forming a carbon coating includes: passing the bare optical fiber 10 coated with the first coating through the inner cavity of a carbonization device 40 for carbonization so as to convert the first coating into a carbon coating, wherein an inert gas is passed through the inner cavity of the carbonization device 40, and the heating temperature of the carbonization device 40 is in the range of 500°C to 1200°C.

[0042] In this embodiment, within the temperature range of 500°C to 1200°C, the first coating can be pyrolyzed in an inert gas environment to decompose carbon elements and form an amorphous carbon coating. The inner cavity of the carbonization device 40 is introduced with an inert gas (such as argon or nitrogen) to prevent oxidation or explosion reactions between the coating material and the optical fiber surface at high temperatures. The protective effect of the inert gas ensures the safety of the carbonization process.

[0043] In one embodiment of the present invention, a bare optical fiber coated with a first coating is sequentially carbonized through the inner cavities of at least two carbonization devices 40 to convert the first coating into a carbon coating, wherein the heating temperatures of at least two carbonization devices 40 gradually increase along the conveying direction of the bare optical fiber, and the temperature difference between two adjacent carbonization devices 40 ranges from 50°C to 200°C.

[0044] In this embodiment, the carbonization process of gradually increasing the temperature helps the first coating to be more evenly and thoroughly converted into a carbon coating, while reducing the possibility of bubbles and cracks. A lower starting temperature can ensure the initial carbonization of the first coating, and as the temperature gradually increases, the first coating is completely decomposed to form a denser and more uniform carbon coating. The temperature difference between two adjacent carbonization devices 40 ranges from 50°C to 200°C. The above-mentioned temperature gradient setting can optimize the carbonization process in stages, so that the first coating starts from a lower temperature and gradually enters a higher temperature environment, which helps the first coating to gradually pyrolyze and carbonize to form a more uniform and dense carbon coating.

[0045] In one embodiment of the present invention, the second raw material for forming the second coating layer is selected from one or more of polyimide, silicone resin, and polyurethane.

[0046] In this embodiment, polyimide, silicone resin and polyurethane all have excellent mechanical properties. As the material of the second coating, they can further enhance the mechanical strength of the optical fiber, making it less susceptible to damage in complex environments and extending the service life of the optical fiber.

[0047] In one embodiment of the present invention, the step of coating the surface of the carbon coating and forming a second coating comprises: coating the surface of the carbon coating with a second raw material; and curing the bare optical fiber coated with the second raw material to form a second coating.

[0048] In this embodiment, when the second raw material is polyimide, the second raw material is cured by heating to form the second coating, and the curing temperature is in the temperature range of 200°C to 400°C, which can promote the intermolecular force between the second coating and the carbon coating, and enhance the bonding strength between the second coating and the carbon coating, thereby reducing the risk of delamination or shedding of the second coating and the carbon coating during use, and improving the overall structural stability and service life of the carbon-coated optical fiber. When the second raw material is selected from at least one of silicone resin and polyurethane in addition to polyimide, the second raw material is cured by heating and UV curing to form the second coating.

[0049] like Figure 2 As shown, the present invention also provides a manufacturing device for a carbon-coated optical fiber, the manufacturing device for a carbon-coated optical fiber is used to realize the manufacturing process of the carbon-coated optical fiber as described above, and the manufacturing device for a carbon-coated optical fiber comprises: a fiber-releasing device 20, used to release a bare optical fiber 10; at least two coating devices 30, the fiber-releasing device 20 and the at least two coating devices 30 are sequentially arranged at intervals along the conveying direction of the bare optical fiber 10; a carbonizing device 40, the carbonizing device 40 is located between a coating device 30 for coating to form a first coating and a coating device 30 adjacent to the coating device 30, the carbonizing device 40 has an inner cavity, the inner cavity is configured for the bare optical fiber to pass through, and the inner cavity is passed with an inert gas.

[0050] In this embodiment, the carbonization device 40 is located between the coating device 30 for coating to form the first coating and the coating device 30 adjacent to the coating device 30, that is, the carbonization device 40 is located between the coating device 30 for coating to form the first coating and the coating device 30 adjacent to the coating device 30 for coating to form the first coating.

[0051] The bare optical fiber 10 is pulled out of the preform rod by using the fiber release device 20, and then the bare optical fiber 10 enters the first coating device 30 for a coating to form a first coating, and then the optical fiber enters the inner cavity of the carbonization device 40, and the inner cavity of the carbonization device 40 is passed with an inert gas (such as argon or nitrogen) to provide an oxygen-free environment for the carbonization of the first coating. Under the protection of the inert gas, the first coating is heated and decomposed and converted into a protective carbon film (i.e., carbon coating). Since the carbonization process is carried out in an oxygen-free environment, the hydrocarbon gas is prevented from contacting with oxygen, thereby eliminating the risk of explosion. The carbonized optical fiber continues to move forward and enters the second coating device 30 for a secondary coating to enhance the mechanical strength of the optical fiber.

[0052] like Figure 2 As shown, in one embodiment of the present invention, the manufacturing device of the carbon-coated optical fiber also includes at least two curing devices 50, at least two coating devices 30 and at least two curing devices 50 are arranged in a one-to-one correspondence, and the curing device 50 is located on the discharge side of the corresponding coating device 30.

[0053] In this embodiment, at least two coating devices 30 and at least two curing devices 50 are arranged in a one-to-one correspondence, ensuring that the coating material can be immediately cured after each coating, which helps to form a more uniform and more adherent coating and improve the bonding stability between the coating and the optical fiber.

[0054] In one embodiment, the curing device 50 includes a first curing unit and / or a second curing unit. The first curing unit adopts an annealing and insulation furnace in the prior art. The specific structure of the annealing and insulation furnace is not repeated here. The second curing unit adopts a UV curing furnace in the prior art. The specific structure of the UV curing furnace is not repeated here. The annealing and insulation furnace is used for heating and curing, and the UV curing furnace is used for ultraviolet curing.

[0055] Preferably, the heating temperature of the curing device 50 is 300°C or 360°C.

[0056] like Figure 2 As shown, in one embodiment of the present invention, the carbonization device 40 is provided with an air inlet and an air outlet connected to the inner cavity, and the air inlet and the air outlet are arranged on opposite sides of the carbonization device 40 along the conveying direction of the optical fiber.

[0057] In this embodiment, the inert gas enters the inner cavity of the carbonization device 40 through the air inlet, flows along the direction of optical fiber delivery, and is finally discharged from the exhaust port, forming a stable and continuous airflow path, which helps the inert gas to better surround and protect the optical fiber, ensure that the carbonization process is carried out in an oxygen-free environment, thereby avoiding the risk of combustion and explosion. At the same time, the flow of inert gas can take away the waste gas and by-products generated by the reaction. By arranging the air inlet and the exhaust port on opposite sides of the carbonization device 40, the reverse flow of the inert gas inside the device can be effectively prevented, ensuring that the flow direction of the inert gas is consistent with the direction of optical fiber delivery, avoiding fluctuations in temperature and gas composition caused by the reverse flow of the inert gas, and ensuring the continuity and consistency of the carbonization reaction.

[0058] like Figure 2 As shown, in one embodiment of the present invention, the manufacturing device of the carbon coated optical fiber further includes an air inlet pipe 42 and an air outlet pipe 43, the carbonization device 40 includes a furnace body 41, the air inlet port and the air outlet port are arranged on the furnace body 41, the furnace body 41 has a hollow cavity, the hollow cavity of the furnace body 41 forms the inner cavity of the carbonization device 40, the air inlet pipe 42 and the air outlet pipe 43 are installed on the furnace body 41, and the air outlet end of the air inlet pipe 42 is connected to the air inlet port, and the air inlet end of the air outlet pipe 43 is connected to the exhaust port.

[0059] like Figure 2 As shown, in one embodiment of the present invention, the manufacturing device of the carbon-coated optical fiber further includes a first guide portion 80, a second guide portion 90, two wire diameter gauges 60, and a fiber collection device 70. The fiber collection device 70 is used to wind the finished optical fiber (carbon-coated optical fiber) on an optical fiber disk or an optical fiber wheel at a certain tension and speed. The first guide portion 80 is arranged on the discharge side of the fiber release device 20, and the bare optical fiber 10 is wound around the periphery of the first guide portion 80. The first guide portion 80 mainly guides and stabilizes the bare optical fiber 10 just released from the preform rod, ensuring that the bare optical fiber can enter the coating device 30 straightly and accurately. The second guide portion 90 is arranged on the receiving side of the fiber collection device 70, and the optical fiber coated with the second coating is wound around the periphery of the second guide portion 90. The function of the second guide portion 90 is to guide the optical fiber after coating and carbonization treatment so that it can smoothly enter the fiber collection device 70 for winding. One of the wire diameter meters 60 is set on the discharge side of the first curing device 50 to monitor the change in optical fiber diameter after the first coating to ensure that the coating thickness meets expectations. The other wire diameter meter 60 is set on the discharge side of the second curing device 50 to monitor the coating thickness after the second coating.

[0060] In one embodiment, the first guide portion 80 and the second guide portion 90 are both guide wheels.

[0061] In one embodiment, the carbonization device 40 is a carbonization furnace of the prior art.

[0062] In one embodiment, the fiber laying device 20 may adopt a drawing tower of the prior art, and the specific structure will not be described in detail here.

[0063] In one embodiment, the bare optical fiber 10 is a single-mode optical fiber or a multi-mode optical fiber.

[0064] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the surface of the bare optical fiber is coated and a first coating is formed, and the carbonization process of the first coating is carried out in an inert gas environment, that is, the carbonization reaction is carried out in an oxygen-free environment, which can avoid the combustion or explosion caused by the contact of volatile organic matter produced by the decomposition of the first coating with oxygen, and a second coating is also coated on the surface of the carbonized layer to protect the carbonized layer, and at the same time, the mechanical strength of the finished optical fiber can be improved. As can be seen from the above, compared with the prior art using reaction gas (methane, acetylene, ethylene, propylene, butadiene and benzene, etc.) to thermally decompose on the optical fiber surface to form an amorphous carbon film, the present application is to coat a first coating on the outer surface of the bare optical fiber and carbonize it to form a carbonized layer, and the process of forming the carbonized layer is carried out in an inert gas environment, without the need to introduce flammable reaction gas, so that the reaction gas reacts with oxygen and forms a carbon film on the optical fiber surface, so that the problem of combustion and explosion in the production process of carbon-coated optical fiber can be avoided.

[0065] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for manufacturing a carbon coated optical fiber, characterized in that: The manufacturing process of the carbon coated optical fiber comprises: Coating the surface of the bare optical fiber (10) to form a first coating; In an inert gas environment, carbonizing the first coating layer to convert the first coating layer into a carbon coating layer; The surface of the carbon coating layer is coated to form a second coating layer.

2. The process for manufacturing a carbon coated optical fiber according to claim 1, characterized in that: The first raw material for forming the first coating layer is an organic polymer material.

3. The process for manufacturing a carbon coated optical fiber according to claim 2, characterized in that: The first raw material for forming the first coating layer is selected from one or more of polyimide, phenolic resin, and polyacrylonitrile.

4. The process for manufacturing a carbon coated optical fiber according to any one of claims 1 to 3, characterized in that: The concentration of the first raw material for forming the first coating layer ranges from 1% to 10%; and / or the thickness of the first coating layer ranges from 0.1 μm to 10 μm.

5. The process for manufacturing a carbon coated optical fiber according to any one of claims 1 to 3, characterized in that: The step of coating the surface of the bare optical fiber (10) and forming the first coating comprises: Coating a first raw material on the surface of the bare optical fiber (10); The optical fiber coated with the first raw material is cured by passing through a curing device (50) to form the first coating, and the heating temperature of the curing device (50) is in the range of 200° C. to 400° C.

6. The process for manufacturing a carbon coated optical fiber according to claim 5, characterized in that: The bare optical fiber (10) coated with the first raw material is sequentially passed through at least two curing devices (50) to be cured and form the first coating, wherein along the conveying direction of the bare optical fiber (10), the heating temperature of at least two curing devices (50) gradually increases, and the temperature difference between two adjacent curing devices (50) is in the range of 50°C to 100°C.

7. The process for manufacturing a carbon coated optical fiber according to any one of claims 1 to 3, characterized in that: The step of carbonizing the first coating layer and forming the carbon coating layer comprises: The bare optical fiber (10) coated with the first coating is carbonized through the inner cavity of a carbonization device (40) so that the first coating is converted into the carbon coating, wherein an inert gas is passed through the inner cavity of the carbonization device (40) and the heating temperature of the carbonization device (40) is in the range of 500° C. to 1200° C.

8. The process for manufacturing a carbon coated optical fiber according to claim 7, characterized in that: The bare optical fiber (10) coated with the first coating is sequentially passed through the inner cavities of at least two of the carbonization devices (40) for carbonization, so that the first coating is transformed into the carbon coating, wherein along the conveying direction of the bare optical fiber (10), the heating temperature of at least two of the carbonization devices (40) is gradually increased, and the temperature difference between two adjacent carbonization devices (40) is in the range of 50° C. to 200° C.

9. The process for manufacturing a carbon coated optical fiber according to any one of claims 1 to 3, characterized in that: The second raw material for forming the second coating layer is selected from one or more of polyimide, silicone resin and polyurethane.

10. The process for manufacturing a carbon coated optical fiber according to any one of claims 1 to 3, characterized in that: The step of coating the surface of the carbon coating and forming the second coating comprises: Coating a second raw material on the surface of the carbon coating; The bare optical fiber (10) coated with the second raw material is cured to form the second coating layer.

11. A device for manufacturing a carbon-coated optical fiber, characterized in that: The carbon-coated optical fiber preparation device is used to implement the manufacturing process of the carbon-coated optical fiber according to any one of claims 1 to 10, and the carbon-coated optical fiber preparation device comprises: A fiber releasing device (20) for releasing the bare optical fiber (10); at least two coating devices (30), the fiber-releasing device (20) and the at least two coating devices (30) being arranged in sequence and spaced apart along the conveying direction of the bare optical fiber (10); A carbonization device (40) is located between the coating device (30) for coating and forming the first coating layer and the coating device (30) adjacent to the coating device (30), wherein the carbonization device (40) has an inner cavity, the inner cavity is configured for the bare optical fiber (10) to pass through, and an inert gas is passed through the inner cavity.

12. The manufacturing device for carbon coated optical fiber according to claim 11, characterized in that: The carbon-coated optical fiber manufacturing device further comprises at least two curing devices (50), wherein at least two coating devices (30) and at least two curing devices (50) are arranged in a one-to-one correspondence, and the curing device (50) is located at the discharge side of the corresponding coating device (30).

13. The manufacturing device of carbon coated optical fiber according to claim 11, characterized in that: The carbonization device (40) is provided with an air inlet and an air outlet communicated with the inner cavity, and along the conveying direction of the bare optical fiber (10), the air inlet and the air outlet are arranged on opposite sides of the carbonization device (40).

Images