Low-noise 300-GHz oscillator based on an optical SiN microresonator

We report on the generation of an ultralow phase noise 300-GHz signal using a soliton Kerr frequency microresonator comb (microcomb). By transferring the spectral purity of a 10 GHz dielectric resonant oscillator to the repetition rate of a silicon nitride microresonator, operating in soliton regime, we measure a phase noise of −88 dBc/Hz at 10 kHz offset frequency for a 300 GHz carrier.