Study of supercontinuum generation in suspended core photonic crystal fiber with As₂Se₃ substrate and Cs₂-filled air hole

Abstract This paper investigates the generation of an ultrawide spectrum in the mid-infrared region using a suspended-core fiber (SCF) fabricated from As₂Se₃ chalcogenide glass, in which carbon disulfide is employed as a liquid filling material for three air-holes instead of conventional air. The inclusion of carbon disulfide in the air pores significantly modifies the dispersion characteristics of the optical fiber, enabling a flattened dispersion profile close to zero over a broad wavelength range. Such dispersion-tuning techniques play a crucial role in enhancing nonlinear spectral broadening. Simulation results demonstrate that an ultrawide spectrum spanning from 0.99 μ m to 3.925 μ m can be generated in the proposed SCF, which is only 10 cm long, using a low peak power of 800 W with a pump pulse centered at 2500 nm. The smooth supercontinuum spectrum obtained in the all-normal dispersion regime is expected to exhibit high temporal coherence, as the spectral broadening is primarily influenced by deterministic nonlinear effects such as self-phase modulation and optical wave breaking.