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Soliton frequency comb generation in coupled nonlinear microcavities isattractive because a coupled microcavity offers more flexibility andpossibilities compared to a single nonlinear microcavity. In this paper, weinvestigate how an amplifying auxiliary cavity affects the bistability regionof the main cavity and soliton frequency comb generation. When the auxiliarycavity has a small gain, it can partially compensate for the loss of the maincavity allowing the generation of soliton combs with a relatively low Q-factorin the main cavity. A low Q-factor microcavity would reduce the difficulty offabrication and extend the microcavity platform to different types ofmaterials. However, if the gain of the auxiliary cavity is too large, afrequency comb cannot be generated because the coupled nonlinear microcavitysystem is no longer dissipative. Our results provide a theoreticalunderstanding and experimental guidance for the bistability region and solitonfrequency comb generation in coupled nonlinear microcavities with an amplifyingauxiliary cavity. The results will facilitate the development of chip-scaleintegrated optical frequency comb sources.

Soliton frequency comb generation in a low Q microcavity coupled to a gain microcavity