Computational design & analysis of GeSe2-As2Se3-PbSe based rib waveguide for mid-infrared supercontinuum generation

We report computational modelling and numerical analysis of rib optical waveguide composed of chalcogenide GeSe2-As2Se3-PbSe and MgF2 glasses for mid infrared supercontinuum generation. Employing finite element method, we analyse the influence of geometrical parameters on waveguide dispersion & nonlinearity and perform dispersion engineering to minimize dispersion effects. Later, we analyse the influence of laser operating conditions on spectral broadening. Our simulations report a waveguide featuring zero dispersion wavelength at 2680 nm and 3310 nm in the mid infrared region, 1.4-7.6 mu m spectral broadening when pumped at 3.1 mu m wavelength with 85 fs pulses at peak power of 5.2 kW in a 10 mm long waveguide and nonlinearity of 991 W-1 km(-1) making it suitable for mid infrared nonlinear applications.