Study of Highly Coherent Mid-Infrared Supercontinuum Generation in CMOS Compatible Si-Rich SiN Tapered Waveguide

• DOI: 10.1109/jlt.2022.3157792
• Publication Date: 2022-03-08T21:39:00Z
• Authors: M. R. Karim; Nayem Al Kayed; Nusrat Jahan; M. Shah Alam; B. M. A. Rahman
• Keywords: Supercontinuum; Waveguide

A promising 2-mm-long highly coherent air-clad suspended core planar Si-rich SiN tapered waveguide is proposed for supercontinuum generation in the midinfrared. Supercontinuum evolution investigated by tuning both of transverse-electric (TE) and transverse-magnetic (TM) polarizations employing pump at 1.55 m with a pulse duration 50-fs peak power 50 W. Optimum dimensional parameters including width thickness are obtained between 1.5-3 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula> 250 nm TE excitation 270–330 1.5 TM excitation, respectively, keeping slab constant 100 designs. Initially, SC coverages two uniform sections situated terminal points waveguide. Spectral also studied types approaches: increasing order tapering (IOT) decreasing (DOT). In case waveguide, simulation results either show that coverage can be predicted beyond 5 On other hand, varying IOT approach DOT make better impacts spectral extension flatness owing to simultaneous variations dispersion nonlinearity along propagation direction. Thus, midinfrared up 6 6.3 taper compared traditional design. Finally, coherence generated various coefficients output.