A manufacturing method of bow-tie optical fiber preform with small stress zone for torsion

Abstract

The invention discloses a manufacturing method of a twisted bow-tie optical fiber perform with a small stress zone. The manufacturing method is characterized in that the optical fiber perform is manufactured by a modified chemical vapor deposition method (MCVD) and has a smaller area of stress zone than a traditional bow-tie optical fiber perform and therefore the problem that an optical fiber perform is prone to blasting in a subsequent processing treatment process can be solved; in addition, since the inner skin layer of the optical fiber perform is relatively large in diameter, the problem that the ovality of a core layer is large is solved and the fiber loss is further lowered; and since a sleeve layer is added at the outer part of the optical fiber perform, the problems of quartz volatilization and stockpiling can be solved when the optical fiber perform is twisted. The manufacturing method is low in operation difficulty; and the manufactured optical fiber perform is applicable to being twisted at a high temperature or polished at normal temperature, which is crucial for manufacturing of circular-birefringence optical fibers.

Description

Technical field [0001] The invention relates to a method for manufacturing a bow-tie optical fiber preform with a small stress area used for twisting, and is a key step for manufacturing a circular birefringent optical fiber. Background technique [0002] In recent years, all-fiber current transformers have become the development trend of new current transformers due to their advantages of large dynamic range, bandwidth, flexible installation, strong anti-electromagnetic interference ability, and measurable AC and DC signals. Since the all-fiber current transformer based on the Faraday effect is also sensitive to the linear birefringence in the optical fiber sensing ring, this makes the low linear birefringence fiber the core component of the all-fiber current transformer. [0003] The initial low linear birefringence fiber was obtained by twisting ordinary single-mode fiber. The specific manufacturing method is also published in the Chinese patent "Fiber production equipment and m...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for manufacturing a twisted bow-tie optical fiber preform in a small stress zone, including the steps of preform making and preform casing, especially to solve the problem that the traditional bow-tie preform is easy to burst during subsequent processing problems, the high ellipticity of the traditional bow-tie preform core, and the problems of quartz volatilization and stacking during twisting

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