We present broadband supercontinuum generation in dispersion engineered tellurite clad As₂S₃ core photonic crystal fiber. Finite element method (FEM) is adopted for different numerical analysis of the fiber. The design is so engineered that zero dispersion is obtained at 1550-nm wavelength. Very high nonlinearity is achieved in the proposed structure as 5.5  ×  10⁴  W^−  1 km^−  1. For a 20 fs input pulse with 3-kW peak power, the fiber presents a wideband supercontinuum spectrum spanning a huge bandwidth of 11,454 nm using just 1-mm length of fiber. This might play a vital role in ultra-broadband signal amplification, biomedical imaging, biophotonics, and spectroscopy.