High-temperature-resistance optical fiber

Abstract

Disclosed is a high-temperature-resistance optical fiber which relates to the field of optical-fiber manufacturing. The optical fiber includes an optical-fiber body and coatings which cover the optical-fiber body. The optical-fiber body is covered with three coatings from inside to outside. A third coating at the outermost layer is a polyimide with a Young modulus higher than 3GPa. When a first coating is carbon, a second coating is a polyimide with a Young modulus lower than 1GPa. When the first coating is a polyacrylic resin with a Young modulus lower than 1.5MPa, the second coating is a high-temperature-resistance polyacrylic resin with a Young modulus higher than 1GPa. Compared with conventional double-coating optical fibers, the high-temperature-resistance optical fiber has transmission characteristics of better temperature performance and better attenuation and the like under a high-temperature environment so that global properties of the optical fiber meet demands of a high-temperature environment and the optical fiber is capable of standing a temperature up to 350 DEG C.

Description

technical field [0001] The invention relates to the field of optical fiber manufacturing, in particular to a high temperature resistant optical fiber. Background technique [0002] At present, the coating structure of conventional optical fibers is generally a double-coating structure, that is, it is divided into an inner coating next to the silica fiber and an outer coating wrapped around the inner coating. Generally, the inner coating is made of a softer material, and the outer coating The layer is a harder material. When the optical fiber is subjected to external force, the harder outer layer first acts to resist the external force, and then the softer inner layer buffers the external force. Now the optical fiber coating materials used in mainstream optical fibers are all polyacrylic resins. The difference between the inner coating and the outer coating is only a part of the composition. The advantage of this is that the inner coating material and the outer coating mater...

AI Technical Summary

Problems solved by technology

[0003] However, when the use environment is relatively special or relatively harsh, this double-coating structure design has the phenomenon of reduced reliability, poor optical fiber performance, or even unusable

In some applications, such as high-temperature environments such as oil well exploration, optical fibers have also been used for signal transmission, but the maximum temperature that conventional coatings can adapt to is 85°C. If metal coatings are used for direct coating, on the one hand, the attenuation and other performance of optical fibers will be reduced. It is greatly affected, and the coating layer is also difficult to peel off, making it difficult to use

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