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Multi-spectral frequency combs provide frontier architectures for laserstandoff spectroscopy, optical clockwork, and high-capacity opticalcommunications. Frequency microcombs, aided by their high-quality resonancesand inherent third-order nonlinear susceptibility, have demonstrated remarkableimpact in frequency metrology and synthesis. However, microcombs are often withlimited spectral bandwidth bounded by the intrinsic second-order chromaticdispersion and the consequently low intensities at the spectral edges. Toenhance the applications of frequency combs, a spectrally-broad comb generationscheme is often desired. Here we report coherent satellite clusters inmulti-spectral regenerative frequency microcombs with enhanced intensities atthe octave points and engineered frequency span. Beyond the conventionalbandwidth of parametric oscillation, the regenerative satellites arefacilitated by higher-order dispersion control allowing formulti-phase-matching in the microcavities. The frequency span of themulti-spectral regenerative satellites is deterministically controlled from 57THz to 126 THz by pumping at C- and L- bands. We demonstrate that theregenerative satellite preserves the coherence with the central comb throughthe nonlinear parametric process. We further show the mirrored appearance ofthe satellite transition dynamics including each comb state that aresimultaneously observed at the central comb. These multi-spectral regenerativesatellites extend the scope of parametric-based frequency combs and provide aunique platform with wide applications.

Coherent satellites in multi-spectral regenerative frequency microcombs