Polyimide coated optical fiber and machining process thereof

A polyimide coating, polyimide technology, applied in the direction of cladding fiber, optical waveguide light guide, etc., can solve the problems of fiber failure, accelerated fiber fatigue process, accelerated coating polymer chain, etc.

Inactive Publication Date: 2014-07-23
JIANGSU HENGTONG OPTICAL FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If you work in an environment higher than 85°C for a long time, ordinary UV-cured coatings will undergo thermal aging, especially in the presence of O2, thermal oxygen aging will occur, which will accelerate the process of breaking the polymer chains of the coating, so that The coating makes it protect the optical fiber, it cannot prevent water molecules from invading the optical fiber, accelerates the fatigue process of the optical fiber, and expands the micro-cracks on the surface of the optical fiber, resulting in the failure of the optical fiber

Method used

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  • Polyimide coated optical fiber and machining process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] refer to figure 1 , the invention comprises that the diameter of the quartz core layer of the bare optical fiber is 9 μm, the diameter of the quartz cladding layer is 125 μm, and the diameter of the polyimide coating layer is 155 μm, which is a high-temperature-resistant optical fiber for communication.

[0048] Production steps: Melt an optical fiber preform rod with a diameter of 60mm in a high-temperature graphite induction furnace at 1950°C, and draw it into an optical fiber by drawing and drawing. The spinning speed is 8m / min, and the cladding diameter of the bare fiber is 125μm. The bare optical fiber went through two on-line coating-curing cycles. After the initial coating, the outer diameter of the polyimide coating was 137 μm, and the thickness on one side was 6 μm. Wherein each online coating and curing process coats a single side with a thickness of 3 μm. Wind the preliminarily coated optical fiber on the reel, and wait for the off-line process. The proces...

Embodiment 2

[0059] The difference between Example 2 and Example 1 is that the core diameter of the bare fiber is 400 μm, the cladding diameter is 440 μm, and the diameter of the polyimide coating layer is 470 μm, which is a high-temperature-resistant large-core energy transmission fiber .

[0060] Production steps: melt the polarization-maintaining preform rod with a diameter of 40mm in a high-temperature graphite induction furnace at a temperature of 2050°C, and draw it into an optical fiber by drawing and drawing. The spinning speed is 4 m / min, and the cladding diameter of the optical fiber is 440 μm. After two online coating and curing cycles, the thickness of one side of each coating is 3 μm. After the initial coating, the outer diameter of the polyimide coating is 452 μm. . The online coating process parameters are shown in the following table 2-1:

[0061] table 2-1

[0062] parameter name

value

Drawing speed, m / min

4

Viscosity of polyimide soluti...

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Abstract

The invention relates to the technical field of optical fiber manufacture, in particular to a polyimide coated optical fiber and a machining process thereof. The polyimide coated optical fiber comprises a bare optical fiber and a coating layer, the diameter of the bare optical fiber ranges from 80 micrometers to 660 micrometers, the coating layer externally coats the bare optical fiber, the bare optical fiber comprises a quartz core layer and a quartz cladding layer externally surrounding the quartz core layer, a polyimide coating layer externally coats the quartz cladding layer, and the thickness of a single edge of the polyimide coating layer ranges from 10 micrometers to 25 micrometers. Polyimide materials coat the surface of the bare optical fiber, and compared with a conventional coated optical fiber, the polyimide coated optical fiber has the advantages of high temperature resistance, aging resistance, radiation resistance, stability, durability and the like and can be used for a long time in a high-temperature hostile environment for a long time. The diameter of the coating layer can be accurately controlled, deviation of the diameter is + / -3 micrometers, and the concentricity of the coating layer and the fiber cladding layer is smaller than or equal to 5.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a polyimide-coated optical fiber and its processing technology. Background technique [0002] With the development of optical fiber technology, the application of optical fiber has been extended to laser energy transmission, sensing technology and other fields, and the application range has also been extended to various high temperature and harsh environments. Optical fiber is used as information transmission material, its core layer and cladding are mainly composed of quartz, and the cladding is covered with a layer of coating to protect the optical fiber. Ordinary optical fiber is coated with UV-curable acrylic resin, and its service temperature is -60°C-85°C. If you work in an environment higher than 85°C for a long time, ordinary UV-cured coatings will undergo thermal aging, especially in the presence of O2, thermal-oxidative aging will occur, which will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02C03C25/34
Inventor 俞亮郭浩林焦猛曹少波郭洁沈文华张良李建明袁健
Owner JIANGSU HENGTONG OPTICAL FIBER TECH
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