Linear Feedback Actuator of the Repetition Rate Frequency of Soliton Microcombs Using a C-Band Auxiliary Laser

Soliton microcomb formation has been demonstrated using pump and auxiliary lasers, all operating in C-band, while being launched in orthogonal polarizations. The repetition rate frequency deviation of the generated microcomb has been investigated by varying the frequency of the auxiliary laser. We find that the repetition rate frequency varies linearly as the auxiliary laser frequency varies, which can thus be utilized in principle as a linear active feedback actuator for stabilizing the soliton microcomb.