Phased-Locked Two-Color Single Soliton Microcombs in Dispersion-Engineered Si3N4 Resonators

Abstract

We propose and theoretically investigate a dispersion-engineered Si3N4 microring resonator, based on a cross-section containing a partially-etched trench, that supports phase-locked, two-color soliton microcomb states. These soliton states consist of a single circulating intracavity pulse with a modulated envelope that sits on a continuous wave background. Such temporal waveforms produce a frequency comb whose spectrum is spread over two widely-spaced spectral windows, each exhibiting a squared hyperbolic secant envelope, with the two windows phase-locked to each other via Cherenkov radiation. The first spectral window is centered around the 1550 nm pump, while the second spectral window is tailored based on straightforward geometric control, and can be centered as short as 750 nm and as long as 3000 nm. We numerically analyze the robustness of the design to parameter variation, and consider its implications to self-referencing and visible wavelength comb generation.

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• pyLLE: a Fast and User Friendly Lugiato-Lefever Equation Solver
• Tunable mid-infrared generation via wide-band four wave mixing in silicon nitride waveguides
• Two-color soliton meta-atoms and molecules
• Advanced dispersion engineering of a III-Nitride micro-resonator for a blue/UV frequency comb
• Resonant Kushi-comb-like multi-frequency radiation of oscillating two-color soliton molecules
• Cherenkov radiation and scattering of external dispersive waves by two-color solitons
• Self-cooling, blue-detuned dissipative Kerr microresonator soliton comb