Broadband Supercontinuum Generation in the Mid-Infrared Range (0.8 µm – 4.5 µm) Using Low Power Dispersion-Engineered LiNbO3 Cladded Silicon-Rich Nitride Waveguide

We numerically modeled a complementary metal-oxide-semiconductor (CMOS) compatible 5-mm-long rectangular waveguide for broadband mid-infrared (MIR) supercontinuum (SCG) generation. The waveguide is constituted using Si-Rich Nitride (SRN) as a core and LiNbO3 glass for its top and bottom claddings. The proposed waveguide structure is optimized for pumping only in the anomalous dispersion regime. Numerical analysis reveals that a wideband SCG into the MIR spanning the wavelength 0.8 μm to 4.5 μm could be generated by the proposed geometry using a very low pulse peak power of 40 W having width of 50-fs employing pump at 1.55 μm wavelength.