Generation of frequency-offset cavity solitons in a pulse-driven optical fiber resonator

The generation of temporal cavity solitons (CSs) in Kerr resonators is well known to lead to the formation of stable frequency combs. In a resonator with pure second-order anomalous dispersion, the soliton's center frequency is pinned to that of the pump field. In this Letter, we consider the operation of CSs in a cavity that possesses a significant component of fourth-order dispersion, which provides a broadband region of parametric gain from which a CS can extract energy. Through the application of a pulsed driving field, temporally desynchronized from the natural roundtrip time of the resonator, we are able to demonstrate the generation of group-velocity-matched CSs, offset in frequency from the pump, and tunable over a ∼1.5 THz range. In addition, we observe a new spectral feature that forms on the opposite side of the pump to the CS that we identify as arising from linear-wave scattering from the CS field.