Thin-diameter solid-core polarization-maintaining photonic crystal fiber of two-layer structure

Abstract

The invention discloses a thin-diameter solid-core polarization-maintaining photonic crystal fiber of a two-layer structure, wherein the cross section of an optical fiber is circular. The polarization-maintaining photonic crystal fiber sequentially and structurally comprises a coating layer, a quartz cladding layer, cladding air holes and a fiber core from outside to inside. The cladding air holes are divided into two layers. The first layer of air holes is composed of a first layer of big holes and a first layer of small holes. The second layer of air holes is composed of a second layer of big holes and a second layer of small holes. The circle center of the cross section of the optical fiber serves as an origin and the circle centers of air holes in the first layer are arranged in a regular hexagon shape with the circle center of the cross section of the optical fiber as the distribution center thereof. Two big holes are arranged in the first layer and the two big holes are symmetrically arranged in the transverse direction. Four small holes are arranged in the first layer and the four small holes are at the periphery of the first layer of air holes. The circle centers of air holes in the second layer are arranged in a regular hexagon shape with the circle center of the cross section of the optical fiber as the distribution center thereof. Two big holes are arranged in the second layer and the two big holes are symmetrically arranged in the longitudinal direction. Ten small holes are arranged in the second layer. According to the technical scheme of the invention, the geometrical size of the optical fiber can be greatly reduced. Therefore, the weight of the optical fiber ring is reduced. The size of an optical fiber ring is reduced, and the miniaturization of a gyroscope is facilitated. The integration degree of an optical fiber device is improved.

Description

technical field [0001] The invention belongs to the technical field of microstructured optical fibers, and in particular relates to a thin-diameter solid-core polarization-maintaining photonic crystal optical fiber with a two-layer structure. Background technique [0002] The core of solid-core photonic crystal fiber is made of SiO 2 made of SiO 2 The refractive index of the fiber is much higher than that of the air. Because there are a certain number of air holes in the cladding, the refractive index of the cladding is lower than that of the core. The principle of light transmission in the core is the same as that of the traditional step-type optical fiber. The mechanism is similar, and the principle of total internal reflection is adopted, so the solid core photonic crystal fiber can also be called total internal reflection photonic crystal fiber (TIR-PCF). Different from the traditional step-type optical fiber, there are a certain number of air holes in the cladding of ...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem in the prior art that the diameter of the cladding layer and the coating layer is large, which cannot meet the needs of miniaturized gyroscopes, and proposes a thin-diameter solid-core polarization-maintaining photonic crystal fiber structure with a two-layer structure

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