Design of a novel star type photonic crystal fiber for mid-infrared supercontinuum generation

Abstract

In this work, we have designed two simple photonic crystal fibers (PCFs) with the highly nonlinear chalcogenide material of Ge11.5As24Se64.5 for broadband mid-infrared supercontinuum generation. The hexagonal lattice of air holes in a star type arrangement has been considered in the designs, where only two different air hole sizes and a constant pitch are employed. The study shows that the diameter of the air hole has significant influence on both the dispersion and the nonlinearity parameters of the PCFs. The numerical solutions of the generalized nonlinear Schrödinger equation (GNLSE) for a secant hyperbolic input pulse at different pumping wavelengths at mid-infrared region are investigated by varying input pulse power and fiber lengths. About 3000 nm wide supercontinuum can be generated at pumping wavelength of 2400 nm and input pulse power of 3000W with the designs. Thus, the designs of the PCF can be employed for generating supercontinuum to be useful for medical imaging, bio-sensing, spectroscopy, wave division multiplexing (WDM) systems, and optical communication systems.