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High-temperature resistant optical fiber and method for manufacturing same

A manufacturing method and high-temperature-resistant technology, applied in clad optical fiber, manufacturing tools, glass manufacturing equipment, etc., can solve the problems of mechanical property weakening, failure, coating material aging, etc., to achieve durability, stable use characteristics, good persistent effect

Active Publication Date: 2010-06-09
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology

The existing conventional UV-cured polyacrylate coated optical fiber will seriously age or even fail when the temperature exceeds 85°C. It is easy to cause natural breakage of optical fiber, which cannot meet the reliability requirements of optical fiber transmission in high temperature environment
Chinese patent CN200620128456.7 discloses a high temperature resistant optical fiber, but this patent does not specifically introduce the coating structure and performance of the optical fiber and the method of manufacturing the optical fiber

Method used

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  • High-temperature resistant optical fiber and method for manufacturing same
  • High-temperature resistant optical fiber and method for manufacturing same
  • High-temperature resistant optical fiber and method for manufacturing same

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Embodiment Construction

[0035] The present invention will be described in further detail below through the embodiments and the accompanying drawings.

[0036] Various high temperature resistant optical fibers in the present invention are prepared by pre-coating plus secondary coating process. The key to the process lies in the temperature setting of the pre-curing furnace and box-type electric furnace and the temperature setting of the preform electric melting furnace. Embodiments of the present invention are further described below.

[0037] The first embodiment: the fiber type is HT50 / 55 / 65, which is a kind of ultraviolet transmission fiber. The preform rod with a diameter of 21mm is melted and shrunk in a high-temperature heat field of 2180°C and stretched to form an optical fiber. At a pulling speed of 12m / min, it is coated with a polyimide coating to form a finished optical fiber. The cladding diameter of the optical fiber silica glass is 55 μm, the diameter of the polyimide coating is 65 μm, ...

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Abstract

The invention relates to high-temperature resistant optical fiber and a method for manufacturing the same and belongs to the technical field of special optical fiber communication and high-power laser communication and sensing. The high-temperature resistant optical fiber comprises optical fiber and a coating coated on the outer surface of the optical fiber, wherein the coating is the polyimide coating of which the single-sided thickness is 5 to 25mum, the Young modulus of the cured polyimide coating is equal to or more than 2GPa, the glassy state transition temperature is equal to or more than 300 DEG C, and the range of refractive index is 1.38 to 1.78; and the polyimide coating if formed by dipping the solution of polyimide on the outer surface of the optical fiber, and then heating the fiber to cure the solution of the polyimide, and the whole process comprises pre-coating, pre-curing and secondary coating. The high-temperature resistant optical fiber can be used at a high temperature and under severe working conditions; and when the high-temperature resistant optical fiber is used for a long time, the temperature reaches 300 DEG C, the operational performance is stable, and good persistence is kept. The high-temperature resistant optical fiber product, manufactured by the method, possesses a screening strength of 100kpsi and a segment length of 4km, even 6km.

Description

technical field [0001] The invention relates to a high-temperature-resistant optical fiber used in the technical fields of special optical fiber communication, high-power laser transmission and sensing and a manufacturing method thereof. Background technique [0002] With the development of optical fiber technology, the application range of optical fiber has been extended to various high temperature and harsh environment systems. These systems require optical fibers to maintain good characteristics in harsh environments, which puts forward high optical, mechanical, environmental stability and reliability requirements for optical fibers. The existing conventional UV-cured polyacrylate coated optical fiber will seriously age or even fail when the temperature exceeds 85°C. It is easy to cause natural breakage of optical fiber, which cannot meet the reliability requirements of optical fiber transmission in high temperature environment. Chinese patent CN200620128456.7 discloses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B1/10C03C13/04C03C25/34C03B37/03G02B1/14
Inventor 曹蓓蓓韩庆荣罗杰韦会峰
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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