Optical frequency microcombs based on coherently pumped high-Q microcavities have garnered significant interestes in recent years.These microcombs can greatly miniaturize optical frequency comb systems.However,to further optimize the size,weight,and power comsumption of microcomb systems,the low conversion efficiency of microcombs has to be resolved.In the paper by Li et al.,a simplified theoretical model was established to elucidate the low efficiency issue for microcombs,and the authors also proposed to use quadratic nonlinearity as a nonlinear coupler to enhance the efficiency towards unity.The theory can be an important step to further integration of efficient microcombs.
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