Sub-terahertz-repetition-rate frequency comb generated by filter-induced instabilities in passive driven fiber resonators

Ultrahigh-repetition-rate frequency comb generation exhibits great potential in applications of optical waveform synthesis, direct comb spectroscopy, and high capacity telecommunications. Here we present the theoretical investigations of a filter-induced instability mechanism in passive driven fiber resonators with a wide range of cavity dispersion regimes. In this novel concept of modulation instability, coherent frequency combs are demonstrated numerically with rates up to sub-terahertz level. Floquet stability analysis based on the Ikeda map is utilized to understand the physical origin of the filter-induced instability. Comparison with the well-known Benjamin-Feir instability and parametric instability is performed, revealing the intrinsic distinction in the family of modulation instabilities. Our investigations might benefit the development of ultrahigh-repetition-rate frequency comb generation, providing an alternative method for the microresonators. (C) 2022 Chinese Laser Press

Automated summary

This study presents theoretical investigations on the filter-induced instability mechanism in passive driven fiber resonators. Numerical simulations demonstrate coherent frequency combs with rates up to sub-terahertz level. The comparison with other types of instabilities reveals the intrinsic distinction in the family of modulation instabilities. These findings have significant implications for the development of ultrahigh-repetition-rate frequency comb generation.