Soliton trapping and comb self-referencing in a single microresonator with $\chi^{(2)}$ and $\chi^{(3)}$ nonlinearities

TL;DR

This paper proposes a novel doublet pump pulse scheme for generating octave-spanning soliton Kerr frequency combs and second-harmonic conversion in a single microresonator, enabling compact on-chip optical clocks.

Contribution

It introduces a doublet pulse approach that enhances soliton trapping and demonstrates the potential for single-microresonator comb self-referencing in silicon nitride microrings.

Findings

Expanded soliton region with doublet pulse compared to Gaussian pump

Simulation shows feasibility of single-microresonator comb self-referencing

Potential for integrated optical clock applications

Abstract

A shaped doublet pump pulse is proposed for simultaneous octave-spanning soliton Kerr frequency comb generation and second-harmonic conversion in a single microresonator. The temporal soliton in the cavity is trapped atop a doublet pulse pedestal, resulting in a greatly expanded soliton region compared to that with a general Gaussian pulse pump. The possibility of single-microresonator comb self-referencing in a single silicon nitride microring, which can facilitate compact on-chip optical clocks, is demonstrated via simulation.