Bài báo khoa học

This work proposes a special hexagonal lattice photonic crystal fiber (PCF) based on As2S3 glass with a heterogeneous structure in the micro-cladding. The linear optical characteristics of PCF including effective refractive index, chromatic dispersion, and confinement loss have been numerically analyzed over a wide wavelength range. The results show that all dispersion curves possess a zero-dispersion wavelength (ZDW) and it tends to shift towards the long wavelength as the filling factor decreases. Two fibers with a flat dispersion profile and close to the zero-dispersion line are selected as the two optimal structures and then the values of the optical properties are calculated at the corresponding pump wavelength. As a result, our PCFs obtain small dispersion and very low confinement loss. These are well-suited structures for broadband supercontinuum generation (SC) thanks to the support of pump pulses in the anomalous dispersion regime