Zeonex Based Polarization Maintaining Low Loss Porous Core Fiber for Terahertz Regime

Abstract

We proposed a novel Zeonex based ultra-high birefringent porous - core micro-structured fiber consisting of slotted cladding and hybrid core for THz wave guidance. FEM (Finite Element Method) is used with full-vector condition to investigate the wave guiding properties like birefringence, effective material loss, confinement loss, power fraction, dispersion, effective area and fiber nonlinearity having perfectly matched layer boundary. Addition of four circular holes (air) along with only three elliptical air holes in the core enhances the value of birefringence to 0.0818 with an effective material loss of only 0.0448 cm−1 and a confinement loss of 4×10−7 cm−1 at an operating frequency of 1 THz. Moreover, compact slotted geometry in the cladding imposes as high as 55.3% of total modal power to flow through the core air holes. Furthermore, a nearly flattened dispersion of 1.196±0.08 ps/THz/cm for a range of frequency (0.9-1.6THz) and fiber nonlinearity of 3.33×10−9 W−1 m−1 for an effective area of 1.32×105µm2 are obtained for x-polarized mode for the same operating frequency. This design can easily be fabricated exploiting the existing technology and would be suitable for polarization maintaining applications with a minimal absorption loss in the terahertz regime.