Cavity solitons in a microring dimer with gain and loss

Abstract

We address a pair of vertically coupled microring resonators with gain and loss pumped by a single-frequency field. Coupling between microrings results in a twofold splitting of the single microring resonance that increases when gain and losses decrease and that gives rise to two different cavity soliton (CS) families. We show that the existence regions of CSs are tunable and that both CS families can be stable in the presence of an imbalance between gain and losses in the two microrings. These findings enable experimental realization of frequency combs in configurations with active microrings and contribute towards the realization of compact multisoliton comb sources.

5 pages, 6 figures, accepted in Optics Letters

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• A hierarchy of coupled mode and envelope models for bi-directional microresonators with Kerr nonlinearity
• Dissipative Kerr solitons in a photonic dimer on both sides of exceptional point
• Nonlinear frequency response of the multi-resonant ring cavities
• Microwave generation on an optical carrier in micro-resonator chains
• Integrability and trajectory confinement in $\mathcal{P}\mathcal{T}$-symmetric waveguide arrays
• Hybrid patterns and solitonic frequency combs in non-Hermitian Kerr Cavities