Direct Optical Link between a mmWave Optical Frequency Comb and a Chip-Scale Mode-Locked Laser

A 10GHz MLL-PIC is synchronized to an optical frequency comb at 120GHz using harmonic injection locking. After injection, the Allan Deviation in the repetition rate of the MLL-PIC is 10−11 at 1s. The mmWave comb features an intracavity high-finesse etalon to enhance its frequency stability.