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We demonstrate Kerr soliton frequency comb generation that is seeded by acascaded Brillouin scattering process. In this process, a pump laser is used togenerate multiple orders of Brillouin sidebands in a microresonator, which inturn generate the soliton. In such a process, even orders of Brillouinscattering sidebands are co-propagating with respect to the pump laser whileodd orders of Brillouin scattering are backwards propagating. In this work wepresent the generation of forward propagating Kerr solitons via a forwardpropagating second order Brillouin scattering process in a fused silica rodresonator. Importantly, we show that the Brillouin scattering process canbridge the gap between different microresonator mode families, such that therepetition rate of the Kerr soliton is independent from the Brillouin gainfrequency shift (about 10 GHz in fused silica). In our work we demonstrate thisby generating soliton pulse trains with a repetition rate of 107 GHz. Our workopens up a new way for using cascaded Brillouin lasing as a seed formicroresonator frequency comb generation. This can be of particular interestfor the realization of soliton frequency combs with low noise properties fromBrillouin lasing while still having arbitrary repetition rates that aredetermined by the resonator size. Applications range from optical communicationto LIDAR systems and photonic signal generation.

Microresonator soliton frequency combs via cascaded Brillouin scattering