Design of Highly Nonlinear Asymmetric Bored Core Hexagonal Photonic Crystal Fiber with Large Negative Dispersion

Abstract

In this work, we present a novel design of hexagonal photonic crystal fiber (H-PCF) with asymmetric bored core, which simultaneously achieves large negative optical dispersion and high nonlinearity. To carry out the investigation of the optical characteristics of the proposed H-PCF numerically, electromagnetic solver based on finite element method (FEM) is employed. The modal properties of the photonic fibers such as dispersion and nonlinearity are explored over a wide spectral range from 1.35 μm to 1.6 μm by tuning the optimum geometrical parameters of the design. The numerical study shows that a significant dispersion of –2013 ps/(nm.km) with a nonlinear coefficient of 109.9 W <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> km <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> is obtained at the operating wavelength of 1.55 μm. One of the advantages our proposed structure offers is the design flexibility during the fabrication process since the proposed structure comprises periodic arrangement of circular air holes only. The enhanced negative dispersion and nonlinearity of our proposed photonic structure make it a reliable candidate for high speed optical broadband communication and nonlinear optical processes.