Ge–As–Se–Te chalcogenide based rib-waveguide for highly coherent on-chip mid-infrared supercontinuum generation: design and analysis

We report numerical analysis and design of a rib waveguide composed of a core of Ge–As–Se–Te chalcogenide glass with upper and lower cladding of ZnSe for on-chip mid-infrared supercontinuum generation. By implementing the Finite Element Method (FEM), we analyzed the impact of geometrical parameters of waveguide on optimizing them in order to minimize the dispersion effects and to obtain a flat dispersion curve. Our design possesses Zero Dispersion Wavelength at 5.76 μm and 10.50 μm. The dispersion value at pump wavelength of 9.8 μm is 1.353 ps/nm/km. Our simulation reports a supercontinuum broadening from 3 to 25 μm, when pumped at 9.8 μm wavelength with pulse width 50 fs and peak power 15 kW in only 10 mm long waveguide, making it a promising candidate for mid-infrared supercontinuum light sources for many non-linear applications.