Coherent terahertz-to-microwave link using electro-optic-modulated Turing rolls

Arising from modulation instability, Turing rolls in optical Kerr microresonators have been used the generation of frequency combs and synthesis microwave terahertz frequencies. In this work, by applying electro-optic on terahertz-frequency rolls, we implement division with a microcomb to synthesize variable low-noise signals. We also actively stabilize oscillations reference via intracavity power modulation, obtaining fractional instabilities that are better than those free-running situation up six orders magnitude. This study not only highlights extraordinary spectral purity roll but opens way for bidirectional terahertz-to-microwave links hybrid comb techniques.