Cold-resonance-mediated self-stabilization of Kerr frequency combs in a Si3N4 microring resonator

Kerr frequency combs (KFCs) generated from continuous-wave pumped microresonators have been vastly exploited for a plethora of applications. Along with an appreciable bandwidth, most of the applications demand a stable and coherent frequency comb, which is a challenging quest. Several complex experimental approaches were reported to attain stable frequency combs. In this paper, we report an innovative and simple approach to achieve stabilized KFCs in a Si3N4 racetrack microring resonator. Intensive numerical simulations reveal an enhancement of the comb bandwidth when the temperature is reduced slightly lower than the room temperature. The maximum temperature rise due to the propagating dissipative Kerr soliton (DKS) has also been studied through finite element simulations. Through homogeneous steady-state analysis we validate that the stability of a single DKS state is enhanced at the temperatures reported in this paper. We believe that the proposed thermal route may help in reducing the complex experimental procedures for stabilization of KFCs.

Automated summary

This paper reports an innovative and simple approach to achieve stable Kerr frequency combs (KFCs) using a Si3N4 racetrack microring resonator. Intensive numerical simulations reveal an enhancement of the comb bandwidth when the temperature is slightly lower than room temperature. The maximum temperature rise caused by the propagating dissipative Kerr soliton (DKS) is also studied through finite element simulations. Homogeneous steady-state analysis confirms the enhanced stability of a single DKS state at the reported temperatures.