High-birefringence low-restriction-loss photonic crystal fiber

Abstract

The invention discloses a high-birefringence low-restriction-loss photonic crystal fiber. The substrate material of the fiber is silicon dioxide. The cladding of the optical fiber contains five layers of regular hexagonal air holes. The air holes comprise oval air holes and round air holes, and the air holes are symmetrically arranged up and down. The front four rows of the upper half part of the optical fiber are formed by staggered arrangement of large elliptical air holes and round air holes, two ends of the central row are respectively provided with two large elliptical air holes, small elliptical air holes are close to two sides of a fiber core, and the rest are round air holes with the same size, the distance between two adjacent air holes is equal to the distance between the centers of the small elliptical air holes on the left and right sides of the fiber core and the center of the optical fiber. The photonic crystal fiber has high birefringence and low limiting loss performance, coupling in two polarization directions in the signal transmission process can be reduced by applying the photonic crystal fiber, the transmission distance of optical signals is greatly increased, and the photonic crystal fiber is suitable for a long-distance optical fiber communication system.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a photonic crystal optical fiber with high birefringence and low confinement loss. Background technique [0002] The concept of Photonic Crystal Fiber (PCF) was first proposed by P.St.J.Russel in 1992. The refractive index of the photonic crystal fiber has two-dimensional periodicity in the cross-section of the fiber, and this two-dimensional periodic structure remains unchanged in the direction of the longitudinal axis of the fiber. The structure of photonic crystal fiber is very different from that of conventional optical fiber. Traditional optical fiber is a solid core and cladding, and the material is usually silica, while the cladding of photonic crystal fiber introduces air with a certain regular arrangement. hole. It has "singular" characteristics that cannot be realized by traditional optical fibers, such as high birefringence, flexible dispersion characteristics...

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the shortcomings of the existing photonic crystal fiber with low birefringence and high confinement loss, and provides a photonic crystal fiber with high birefringence and low confinement loss suitable for long-distance transmission

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