Manufacturing method of polarization maintaining optical fiber

Abstract

The invention belongs to the technical field of optical fiber manufacturing and discloses a manufacturing method of a polarization maintaining optical fiber. The manufacturing method comprises the following steps: on the wall of a first-layer casing pipe, symmetrically cutting a gap for the center line of the cavity of the first-layer casing pipe; filling a stress rob at the gap and embedding an optical fiber preform in the first-layer casing pipe; embedding a second-layer casing pipe outside the first-layer casing pipe to form a polarization maintaining optical fiber preform; and wiredrawing the polarization maintaining optical fiber preform to form the polarization maintaining optical fiber, wherein the structure of the gap is filled by the stress rod, and in the high-temperature wiredrawing process, the round stress rod is softened to greatly fill the clearance in the gap so as to form a stress region required by the polarization maintaining optical fiber. Through the matching of the two casing pipes and the stress rod, the manufacturing method of the polarization maintaining optical fiber is simple in structure and has the advantages of greatly simplifying the processing process, reducing the manpower and equipment requirements, greatly improving the influence from the impurities to the product quality and avoiding various high-precision operation requirements in the prior art.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a method for manufacturing a polarization-maintaining optical fiber. Background technique [0002] Polarization Maintaining Optical Fiber (PMF) is referred to as Polarization Maintaining Optical Fiber (PMF). Due to the introduction of birefringence into the fiber, the difference in propagation constant between the two orthogonal modes of degenerate HEx11 and HEy11 increases, and the coupling probability of the two modes decreases. , so that linearly polarized light can maintain its polarization state for transmission in the fiber. Polarization-maintaining fiber has a strong polarization-maintaining ability for linearly polarized light, and is mainly used in polarized light interferometric angle rotation measurement. Its typical applications are in the manufacture of fiber optic gyroscopes, fiber optic hydrophones, and coherent optical communication systems. ...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of the current polarization-maintaining optical fiber preparation method are: the manufacturing process is complicated, and some unavoidable impurities will be introduced into the preform, which makes it difficult to improve the strength of the optical fiber after drawing; at the same time, the requirements for processing technology and equipment are very high. It is easy to damage the core rod of the optical fiber preform, which increases the production cost

Images