Optimization of optical properties of Ge20Sb5Se75-based photonic crystal fibers

Abstract

In this paper, we present a new design of solid-core photonic crystal fiber (PCF), a Ge20Sb5Se75 substrate with a hexagonal lattice structure. The fiber characteristics are studied in the long-wavelength range (from 1.5 µm to 7.0 µm). A full modal analysis and optical properties of designed photonic crystal fibers with lattice constant Λ and filling factor d/Λ are presented in terms of chromatic dispersion, effective refractive index, nonlinear coefficients, and confinement loss. All-normal and anomalous flat dispersion with high nonlinearity and low confinement loss are the outstanding advantages of these photonic crystalline fibers. From there, three optimal structures with Ʌ = 2.0 µm, d/Ʌ = 0.35; Ʌ = 2.5 µm, d/Ʌ = 0.3 and Ʌ = 3.0 µm, d/Ʌ = 0.3 are selected and analyzed in detail for application in supercontinuum (SC) generation.

Design and modeling of the nonlinear properties of octagonal lattice Ge20Sb5Se75 photonic crystal fibers

“…Based on the dispersion property and GVD parameter results, we propose three fibers with suitable characteristic quantities for determining the direction of SC generation. Fibers #F 1 , #F 2 , and #F 3 have very low dispersions-−0.88, 0.08, and 1.646 ps/(nm.km)-at pump wavelengths of 2.85, 3.05, and 2.7 µm, respectively; these values are much lower than those of our previous publication27 on Ge 20 Sb 5 Se 75 -PCF with a hexagonal crystal lattice. In addition, the diversity in the dispersion profiles of the three fibers (all-normal dispersion and anomalous dispersion with one or three ZDWs) strongly influences the characteristics of the SC spectrum.…”

“…We designed and modeled forty Ge 27 and approximately 10 times greater than that of publication 13 . The F3 fiber also has a nonlinear coefficient approximately 4 times greater than 27 . Moreover, the effective mode area is approximately 1.6 times smaller than 10 .…”