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In a uniform microresonator, the generation of a broadband Kerr frequencycomb is triggered by Turing patterns. Here, we study a distinctly differentroute to initiate the Kerr frequency comb by Faraday ripples. Momentumconservation is ensured by azimuthal modulation of the cavity dispersion. Witha good agreement with the theoretical analysis, we demonstrate a multispectralKerr frequency comb covering telecommunication O, C, L, and 2 {\mu}m bands.Comb coherence and absence of a subcomb offset are confirmed by cw heterodynebeat note and amplitude noise spectra measurements. The device can be used forachieving broadband optical frequency synthesizer and high-capacity coherenttelecommunication.

Multispectral Kerr frequency comb initiated by Faraday ripples