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

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 mu m wavelength range. A 6 mu m hyperbolic pulse is injected into this fiber, producing a flat spectrum from 2.45 to 8.4 mu m at a peak power of 5kW. The generated SC in anomalous dispersion PCF can cover multi-octaves by a pump laser with a 6500nm wavelength, 10kW of peak power, and a 90fs duration in 10cm 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.