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Dissipative Kerr soliton (DKS) offers a compact solution of coherent combsources and holds huge potential for applications, but has long been sufferingfrom poor power conversion efficiency when driving by a continuous-wave laser.Here, a general approach to resolving this challenge is provided. By derivingthe critical coupling condition of a multimode nonlinear optics system in ageneralized theoretical framework, two efficiency limitations of theconventional pump method of DKS are revealed: the effective coupling rate istoo small and is also power-dependent. Nonlinear couplers are proposed tosustain the DKS indirectly through nonlinear energy conversion processes,realizing a power-adaptive effective coupling rate to the DKS and matching thetotal dissipation rate of the system, which promises near-unity powerconversion efficiencies. For instance, a conversion efficiency exceeding$90\:\%$ is predicted for aluminum nitride microrings with a nonlinear couplerutilizing second-harmonic generation. The nonlinear coupler approach forhigh-efficiency generation of DKS is experimentally feasible as its mechanismapplies to various nonlinear processes, including Raman and Brillouinscattering, and thus paves the way of micro-solitons towards practicalapplications.

Break the efficiency limitations of dissipative Kerr soliton using nonlinear couplers