Abstract
This paper mainly analyzes the injection locking mechanism of pump laser diode and the breathing microcavity optical frequency comb (microcomb) generation dynamics of the nonlinear optical Kerr microcavity-laser diode butt-coupled system with resonant Rayleigh backscattering feedback. The nonlinear dynamics is especially studied under the condition of the laser diode pump power much higher than the parametric oscillation threshold of the four-wave mixing microcomb in nonlinear Kerr microcavity. Further, we find that under the condition of high-power pumping, the exact mechanism for the system to produce the breathing microcomb is not due to the self-injection locking of the lasing frequency of the laser diode main pump mode, but a newly discovered microcavity resonant excitation mechanism through the pump mode modulation sideband (caused by microcavity Rayleigh backscattering feedback), which is closely related to the breathing characteristics of the generated soliton microcomb.
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