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Low-noise microwave signals can be efficiently generated withmicroresonator-based dissipative Kerr solitons ('microcombs'). However, theachieved phase noise in integrated microcombs is presently several orders ofmagnitude above the limit imposed by fundamental thermorefractive noise. One ofthe major contributors to this additional noise is the pump laser frequencynoise transduction to the soliton pulse repetition rate via the Ramanself-frequency shift. Quiet points (QPs) allow minimizing the transduction oflaser frequency noise to soliton group velocity. While this method has allowedpartial reduction of phase noise towards the fundamental thermodynamical limit,it relies on accidental mode crossings and only leads to very narrow regions oflaser detuning where cancellation occurs, significantly narrower than thecavity linewidth. Here we present a method to deterministically engineer theQP, both in terms of its spectral width, and position, showing an increasedphase noise suppression. This is achieved using coupled high-Q resonatorsarranged in the Vernier configuration. Investigating a generalizedLugiato-Lefever equation that accounts for the hybridized mode spectraldisplacement, we discover a continuum of possible QPs within the solitonexistence region, characterized by ultra-low noise performance. Furthermore, wediscover that by using two controlled optical mode crossings, it is possible toachieve regions where the QPs interact with each other enabling a substantialincrease of the noise suppression range. Our work demonstrates a promising wayto reach the fundamental limit of low-noise microwave generation in integratedmicrocombs.

Quiet point engineering for low-noise microwave generation with soliton microcombs