Abstract

We stabilize a chip-scale ${\mathrm{Si}}_3{\mathrm{N}}_4$ phase-locked Kerr frequency comb via locking the pump laser to an independent stable high-$Q$ reference microresonator and locking the comb spacing to an external microwave oscillator. In this comb, the pump laser shift induces negligible impact on the comb spacing change. This scheme is a step toward miniaturization of the stabilized Kerr comb system as the microresonator reference can potentially be integrated on-chip. Fractional instability of the optical harmonics of the stabilized comb is limited by the microwave oscillator used for a comb spacing lock below 1 s averaging time and coincides with the pump laser drift in the long term.

© 2016 Optical Society of America

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