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

Abstract

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 μm 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