Abstract

Optical frequency combs are a promising technology for widespread applications in precision spectroscopy, microwave generation, frequency metrology, and telecommunications. In recent years, there has been significant demand for chip-scale sources to generate not only single but dual combs. Such dual-comb spectroscopy (DCS) produces two mutually coherent and broadband optical frequency combs with slightly different and preferably controllable repetition rates. The heterodyne beating between these two combs gives a sequence of beat notes enabling high-speed sampling of molecular absorption spectra. However, current Kerr nonlinearity-based micro-ring resonator solutions require external high-power CW pump lasers and the repetition rates are not adjustable.

© 2019 IEEE