Bài báo khoa học

Abstract. This work performs a comparative study on two solid-core photonic crystal fibers (PCFs) with an As2S3 substrate. These two new photonic crystal fibers are designed using Lumerical Mode Solution software based on the finite element method. The introduced structure is a novel structure of six air-hole rings arranged in circular and hexagonal lattices. We analyze and compare the two structures' effective refractive index and dispersion characteristics with the change of filling factor (d/Ʌ). The PCF structures obtained dispersion characteristics diverse including all-normal dispersion and anomalous dispersion with one or two zero-dispersion wavelengths (ZDWs). Flat dispersion and closeness to the zero-dispersion curve in the long wavelength range are the advantages of these structures. The hexagonal lattice PCF structure possesses flat dispersion and is closer to the zero-dispersion curve than the structure with the circular lattice. Meanwhile, the real part of the effective refractive index of the circular lattice is always larger than the hexagonal lattice in the investigated wavelength range, and the effective refractive index decreases as the wavelength increases. Based on analysis and comparison, we have proposed structures with optimal dispersion and pump wavelength suitable for supercontinuum generation with a wide, flat, and smooth spectrum.