Analysis of high-order dispersion on ultrabroadband microresonator-based frequency combs

TL;DR

This paper investigates how high-order dispersion affects the temporal and spectral properties of microresonator-based optical frequency combs, revealing that odd-order dispersion causes temporal shifts and enabling spectral engineering via dispersion profiles.

Contribution

It introduces a numerical analysis of high-order dispersion effects on frequency combs, highlighting the role of odd-order dispersion and methods to engineer comb spectra.

Findings

Temporal shifts are caused by high-odd-order dispersion.

Spectral envelopes can be engineered using dispersion profiles with multiple zero dispersion wavelengths.

High-order dispersion significantly influences intracavity Cherenkov radiations.

Abstract

We numerically investigate the influence of high-order dispersion on both temporal and spectral characterizations of microresonator-based optical frequency combs. The moment method is utilized to study the temporal dynamics of intracavity solitons. The theoretical and numerical results indicate the temporal shifts are induced by high-odd-order dispersion rather than high-even-order dispersion. The role of high-order dispersion on the frequency comb envelopes is carefully elucidated through analyzing the intracavity Cherenkov radiations. We further demonstrate that the spectra envelope of an ultrabroadband optical frequency comb can be engineered by using dispersion profiles with multiple zero dispersion wavelengths.