Structure optimization of large-solid-core photonic crystal fibers based on Ge20Sb5Se75 for optical applications

作者: Ngoc Vo Thi Minh , Danh Nguyen Thanh , An Nguyen Manh , Tham Tran Hong , Lanh Chu Van Van Thuy Hoang

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摘要: This paper presents a new design of Ge20Sb5Se75 large-solid-core-square lattice photonic crystal fiber (PCF) with the first ring of air hole near the core removed. Using the full vector finite element method for anisotropic perfectly matched layers, we numerically examine the dispersion characteristics of the PCF as a function of the wavelength in the mid-infrared range. The results reveal that photonic crystal fibers exhibit a variety of dispersion properties, including all-normal and anomalous dispersion, featuring one or two zero dispersion wavelengths (ZDWs). Based on our numerical simulations, we propose two structures with optimal dispersion characteristics. These designs have small lattice constants (Л= 1.0 µm; Л= 1.5 µm) and low fill factors (d/Л= 0.3; d/Л= 0.35). These proposed PCFs could be candidates for many optical applications as super-continuum generations source.

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