A chalcogenide high birefringence photonic crystal fiber in the wavelength range of 2 to 5 microns

Abstract

The invention provides a sulfur high-birefringence photonic crystal fiber in the waveband range from 2 micrometers to 5 micrometers. An elliptical air hole is absent in a hexagonal lattice photonic crystal structure to form the sulfur high-birefringence photonic crystal fiber. The sulfur high-birefringence photonic crystal fiber comprises a fiber core and cladding. The fiber core and the claddingare positioned on a fiber background material, the cladding is of a hexagonal lattice elliptical air hole array structure, the hexagonal lattice elliptical air hole array structure comprises four outer first elliptical hole systems and inner second elliptical hole systems, the first elliptical hole systems comprise concentric hexagons, and the fiber core is a solid region in the center of the fiber background material. The sulfur high-birefringence photonic crystal fiber has the advantages that light fields in the sulfur high-birefringence photonic crystal fiber are restrained by the claddingwith multiple types of elliptical air hole structures, accordingly, the problem of required long lengths of common polarization maintaining fibers can be solved, the shortcoming that silicon-dioxide-based high-birefringence fibers only can work in near infrared wavebands can be overcome, and complicated fiber core doping technologies can be omitted.

Description

technical field [0001] The invention relates to the technical field of mid-infrared optical fiber communication and optical fiber sensing, in particular to a chalcogenide high birefringence large nonlinear photonic crystal fiber working in the mid-infrared range of 2 to 5 microns. Background technique [0002] High birefringence is the fact that in the actual application of the fiber, because the end face of the fiber is not an ideal circular symmetric structure or the force in the two orthogonal polarization directions is unbalanced due to stress, the two perpendicular components of the light field are in the fiber have different propagation constants, resulting in a difference in effective refractive index. High birefringence can realize the preservation of the polarization state of light waves, and has important and extensive applications in many fields such as fiber optic gyroscopes, fiber optic sensors, optical switches, optical logic gates, optical polarization detecti...

AI Technical Summary

Problems solved by technology

Among them, the introduction of structural asymmetry in the cladding is not easy to achieve high birefringence, and the introduction of structural asymmetry or fiber core doping in the core will cause leakage of the mode field and uncontrollable factors in engineering preparation. However, structural asymmetry is introduced into the core and cladding at the same time, which increases the complexity of the fiber structure.

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