Design of large core AS2S3 chalcogenide PCF pumped at all-normal and anomalous dispersion regimes for supercontinuum generation

Abstract

We design and simulate a near-zero flat dispersion As2S3 photonic crystal fiber (PCF) with a circular shape to generate a broad and smooth supercontinuum (SC). A near-zero flattened dispersion in the all-normal dispersion PCF is maintained in the 4–6.2[Formula: see text]m wavelength range. A 6[Formula: see text]m hyperbolic pulse is injected into this fiber, producing a flat spectrum from 2.45 to 8.4[Formula: see text]m at a peak power of 5[Formula: see text]kW. The generated SC in anomalous dispersion PCF can cover multi-octaves by a pump laser with a 6500[Formula: see text]nm wavelength, 10[Formula: see text]kW of peak power, and a 90[Formula: see text]fs duration in 10[Formula: see text]cm of the proposed fiber structure. These results are achieved by optimizing the fiber structure through the core size. In general, the proposed structures could be used for broadband smooth low-cost SC generation.