One-Stop-Shop for Modeling Optical Frequency Comb Generation

This paper presents a comprehensive study of optical frequency comb generation in a silicon nitride microresonator coupled to a silicon nitride waveguide. We provide a complete numerical framework combining mode solvers, coupledmode theory, and the Lugiato-Lefever equation to accurately model the system. Both numerical simulations and experimental measurements demonstrate the generation of a frequency comb with a 99.6 GHz free spectral range, characterized by a resonant linewidth (full width at half maximum) of 120 MHz, corresponding to a high quality factor of 1.6 million. Discrepancies between the calculated and experimental spectra are attributed to experimental limitations, such as photodetector noise and fabrication imperfections.