In this article, two different circular-lattice photonic crystal fiber (PCF) based on chalcogenide (ChG) compositions (Ge \(_{11.5}\) As \(_{24}\) Se \(_{64.5}\) and Ge \(_{15}\) Sb \(_{15}\) Se \(_{70}\) respectively) are proposed and their performance for supercontinuum (SC) generation are numerically investigated. Both of the structures generate broad SC spectra with high coherence when pumped by a 5 kW, 50 fs hyperbolic secant pulse at 2.5 \(\upmu \) m wavelength and at the same time exhibit strong localization for core-mode with very low confinement loss. In our numerical studies, four unique combinations of the proposed PCF structures and the ChG core compositions were rigorously examined, yielding SC bandwidths having the widest wavelength up to 10.68 \(\upmu \) m and the narrowest wavelength spanning limited to 3.43 \(\upmu \) m. While exhibiting excellent structural tolerance, one particular case among the four combinations also demonstrates the highest spectral flatness in the generated supercontinuum.
