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arXiv · 2203.08453

Break the efficiency limitations of dissipative Kerr soliton using nonlinear couplers

Ming Li·Xiao-Xiao Xue·Yan-Lei Zhang·Xin-Biao Xu·Chun-Hua Dong·Guang-Can Guo·Chang-Ling Zou
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Abstract

Dissipative Kerr soliton (DKS) offers a compact solution of coherent comb sources and holds huge potential for applications, but has long been suffering from poor power conversion efficiency when driving by a continuous-wave laser. Here, a general approach to resolving this challenge is provided. By deriving the critical coupling condition of a multimode nonlinear optics system in a generalized theoretical framework, two efficiency limitations of the conventional pump method of DKS are revealed: the effective coupling rate is too small and is also power-dependent. Nonlinear couplers are proposed to sustain the DKS indirectly through nonlinear energy conversion processes, realizing a power-adaptive effective coupling rate to the DKS and matching the total dissipation rate of the system, which promises near-unity power conversion efficiencies. For instance, a conversion efficiency exceeding $90\:\%$ is predicted for aluminum nitride microrings with a nonlinear coupler utilizing second-harmonic generation. The nonlinear coupler approach for high-efficiency generation of DKS is experimentally feasible as its mechanism applies to various nonlinear processes, including Raman and Brillouin scattering, and thus paves the way of micro-solitons towards practical applications.

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Ming Li, Xiao-Xiao Xue, Yan-Lei Zhang, Xin-Biao Xu, Chun-Hua Dong, Guang-Can Guo, Chang-Ling Zou. 2022-03-16. Break the efficiency limitations of dissipative Kerr soliton using nonlinear couplers. https://doi.org/10.1007/s11433-023-2288-y

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