Temporal cavity soliton generation through stimulated Raman amplification

Temporal cavity solitons underpin the generation of coherent frequency combs. They have been extensively investigated in passive Kerr resonators, where the intracavity optical field is coherently driven by an external pump. In such passive systems, the power of newly generated spectral components is directly converted from the external pump via Kerr nonlinear interactions. In contrast, recent studies of cavity solitons in externally driven active gain cavities have demonstrated that solitons can be sustained by alternative energy sources, thereby expanding the range of physical platforms in which cavity solitons can exist. Motivated by this concept of intracavity amplification on top of the coherent driving, we explore in this work the generation of temporal cavity solitons enabled by distributed stimulated Raman gain. Specifically, we propose to generate cavity solitons by amplifying the intracavity field through stimulated Raman scattering in a fiber ring resonator. By exploiting the wavelength-dependent properties of the fiber resonator, we experimentally demonstrate that the coherent driving field experiences stimulated Raman amplification while simultaneously triggering the formation of temporal cavity solitons.