Design and numerical analysis of highly birefringent single mode fiber in THz regime

摘要

A novel kind of porous core microstructure optical fiber is proposed in this paper. In order to create flexibility of the fiber only ring air hole is used for the cladding region. Finite Element Method (FEM) based Comsol v4.2 software is used to investigate the guiding characteristics of the proposed fiber. The optimum design parameter shows an ultrahigh birefringence of 0.051, low effective material loss of 0.07 cm(-1 )and low bending loss of 1.13 x 10(-13) dB/cm at 1.2 THz. Moreover, the proposed fiber offers very low dispersion of 1.2 +/- 0.32 ps/THz/cm over a wide range of frequency from 1.1 THz to 1.9 THz. Other important guiding characteristics such as confinement loss, effective area and single mode propagation are also discussed in detail. This structure may be a good choice in different remarkable terahertz applications.