Ultra-pure RF tone from a micro-ring resonator based optical frequency comb source

TL;DR

This paper presents a new integrated micro-ring resonator-based optical frequency comb source that produces ultra-pure RF tones with high stability and narrow linewidth, advancing integrated photonics for RF signal generation.

Contribution

The work introduces a novel mode-locked ultrafast laser utilizing a high-Q micro-ring resonator, demonstrating stable dual spectral combs and ultra-narrow linewidth RF modulation.

Findings

Stable operation of two shifted spectral combs

Generation of 60MHz RF tone with linewidth <10kHz

High monochromaticity of RF modulation

Abstract

We demonstrate a novel mode locked ultrafast laser, based on an integrated high-Q micr-oring resonator. Our scheme exhibits stable operation of two slightly shifted spectral optical comb replicas. It generates a highly monochromatic radiofrequency modulation of 60MHz on a 200GHz output pulse train, with a linewidth < 10kHz