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Microresonator-based optical frequency combs have been a topic of extensiveresearch during the last few years. Several theoretical models for the combgeneration have been proposed; however, they do not comprehensively addressexperimental results that show a variety of independent comb generationmechanisms. Here, we present frequency-domain experiments that illuminate thetransition of microcombs into phase-locked states, which show characteristicsof injection locking between ensembles of comb modes. In addition, wedemonstrate the existence of equidistant optical frequency combs that are phasestable but with non-deterministic phase relationships between individual combmodes.

Self-Injection Locking and Phase-Locked States in Microresonator-Based Optical Frequency Combs