2-5 THz broadband hexagonal porous fiber core ultrahigh birefringence terahertz optical fiber

Abstract

The invention discloses a 2-5 THz broadband hexagonal porous fiber core ultrahigh birefringence terahertz optical fiber, and belongs to the technical field of optical fiber communication. The terahertz optical fiber comprises a cladding and a fiber core, wherein the cladding and the fiber core are arranged in a substrate material; the fiber core comprises a central inner layer and an outer layer;the central inner layer is a regular hexagonal area defined by six circular air holes; and the outer layer is composed of 36 circular air holes, and every 6 circular air holes are used as basic unitsto form 6 regular hexagonal areas in an enclosing mode. The fiber core is composed of a plurality of miniature air holes, and comprises a fiber core microstructure composed of the regular hexagonal unit air hole core at the central inner layer and six regular hexagonal units at the outer layer, and a double-layer hexagonal cascaded area is formed by surrounding the six regular hexagonal areas at the outer layer by taking the central inner layer as the center. Due to the asymmetric arrangement of the fiber core structures, the symmetry of the fiber core structures is broken, the birefringence of the terahertz optical fiber is improved, and the absorption loss is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a 2-5THz broadband hexagonal porous core ultrahigh birefringence terahertz optical fiber. Background technique [0002] High birefringence terahertz fiber is a kind of fiber with high birefringence characteristics obtained by changing the size, shape or arrangement of air holes in the two polarization directions of the fiber to adjust the refractive index distribution of the fiber. High birefringence terahertz fibers can provide important support for the polarization-maintaining transmission of terahertz waves, and play an important role in imaging technology, broadband communication, safety detection, biomedicine, etc., and have very high research value and application prospects. The earliest high-birefringence fiber is the polarization-maintaining fiber reported by Blanch et al. of the University of Bath. By using two kinds of air holes with different diamet...

AI Technical Summary

Problems solved by technology

However, the birefringence and absorption loss of the terahertz fiber in the prior art are not ideal

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