A method of manufacturing a polarization-maintaining optical fiber

Abstract

The invention belongs to the technical field of optical fiber manufacturing, and discloses a method for manufacturing a polarization-maintaining optical fiber, comprising the following steps: on the wall of the first layer of casing, cutting a notch symmetrically with respect to the center line of the inner cavity of the first layer of casing; Stress rods are filled in the incision, and an optical fiber preform core rod is embedded in the first layer of casing; a second layer of casing is nested outside the first layer of casing to form a polarization-maintaining optical fiber preform; The polarized optical fiber preform is drawn into a polarization-maintaining optical fiber; wherein, the structure of the gap is filled by a stress rod. During the high-temperature drawing process, the circular stress rod will greatly fill the gap in the cut after softening, forming a polarization-maintaining optical fiber. required stress zone. The invention proposes a polarization-maintaining optical fiber manufacturing method with double sleeves and stress rods, which has a simple structure, greatly simplifies the processing technology and reduces the requirements for labor and equipment; it can greatly improve the impact of impurities on product quality; at the same time, it avoids 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 (Polarization Maintaining Optical Fiber) 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 degenerate HEx11 and HEy11 two orthogonal modes 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 op...

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

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