Manufacturing method of elliptical core polarization maintaining optical fiber

Abstract

The invention relates to a manufacturing method of an elliptical core polarization maintaining optical fiber, which comprises the following steps of: 1, selecting a base tube suitable for a core rod,and carrying out pretreatment; 2, manufacturing a core rod, wherein the core rod comprises an inner cladding and a core layer; 3, after deposition of the core layer of the core rod is finished, directional etching is conducted on one side of the inner wall of the core layer, and etching a crescent shape; then etching crescent shapes with the same radian on the opposite sides, and finally, etchingthe hollow circle in the base tube into an oval shape from an initial circle; step 4, after core rod deposition and etching are finished, performing forward and reverse collapse on the base tube, andmanufacturing a solid elliptical core optical rod; step 5, placing the core rod in the deposited quartz sleeve to form an elliptical core polarization-maintaining optical rod through combination; and6, drawing the optical rod into a small-diameter bare optical fiber, and coating the outer surface of the bare optical fiber with an optical fiber coating to obtain the final elliptical core polarization maintaining optical fiber. Through directional etching and one-time forming, the process procedures are reduced, and the stability and the reliability are improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for manufacturing an elliptical-core polarization-maintaining optical fiber. Background technique [0002] Polarization-maintaining fiber is a special single-mode fiber. By introducing birefringence into the single-mode fiber, the difference between the two orthogonal propagation constants is large, thereby reducing the coupling probability of the two modes, and realizing the linearly polarized light along the fiber. When one main axis is injected, the polarization state of the light can be kept unchanged after a certain distance. From the perspective of the principle of birefringence, the commonly used ones are stress-induced birefringence and geometry-induced birefringence. [0003] At present, the most widely used stress-induced birefringence in China is the Panda-type polarization-maintaining fiber. It has the characteristics of easy coupling and simp...

AI Technical Summary

Problems solved by technology

It has extremely high requirements on processing technology, and the process is complicated

[0006] To sum up, the manufacturing method of elliptical core polarization-maintaining optical fiber in the existing conventional technology has complicated mechanical processing procedures, resulting in difficult processing and poor stability

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