Dispersion Engineered All Normal Diffused Silicon Nitride Waveguide for Optical Frequency Comb Generation

An Optical Frequency Comb has been numerically generated using a Silicon Nitride Waveguide. Geometrical parameters have been optimized for all normal dispersion profiles. Using a dual-wavelength pump around 1.55 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mu \mathrm{m}$</tex> in the all-dispersion 0.04 m long waveguide, a frequency comb spanning 88 nm with 10 dB bandwidth is obtained. As far as we know, this is the first instance such broadband frequency comb is reported in a channel waveguide generated in a single stage with small geometrical dimensions. This optical comb can be used in the advancement of optical atomic clocks, optical rulers, wavelength division multiplexing, and others.