Method for continuously preparing fiber gratings on line

Abstract

The invention discloses a method for continuously preparing fiber gratings on line. According to the method, coating and curing of a prefabricated bar high-temperature drawn bare fiber and a bare fiber protective layer are separated. By the method, adverse interaction between a wire drawing process and an on-line grating write-in and coating process is eliminated; the method is easy to control; and the operation of a system is stable. In addition, mutual constraint factors between the processes are eliminated, the two processes are respectively performed under optimal process conditions, and many technical problems of conventional dynamic on-line grating formation are well solved.

Description

technical field [0001] The invention belongs to the field of optical fiber grating preparation, and relates to a method for continuously writing gratings online during the optical fiber preparation process, in particular to a method for writing identical gratings with a large capacity. Background technique [0002] The large-capacity distributed optical fiber sensing system based on optical fiber gratings has broad application prospects, and its core preparation technology requires gratings to be written in different positions on a long-distance optical fiber to introduce as little insertion loss as possible. The traditional fiber grating preparation method is to prepare the grating first, and then use welding technology to connect all the gratings in series. This method causes significant insertion loss. At the same time, welding causes damage to the optical fiber structure, resulting in poor system reliability. Therefore, scientific research workers began to explore the p...

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Problems solved by technology

[0010] The purpose of the present invention is to propose a new online continuous method for preparing fiber gratings in view of the many technical difficulties and technical deficiencies that are difficult to overcome in the traditional dynamic online grating method, as well as the poor reliability of the continuous preparation of fiber gratings based on finished optical fibers.

This method implements the traditional optical fiber preparation process in stages, that is, the preform high-temperature drawing bare fiber process and the bare fiber protective layer coating and curing process are carried out separately, and the online continuous grid forming process is organically combined to solve the problem of wire drawing speed and system operation. The contradiction between the stability and the poor consistency of the fiber background temperature

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