Abstract

A novel optical frequency division technique, called regenerative harmonic injection locking, is used to transfer the timing stability of an optical frequency comb with a repetition rate in the millimeter wave range (${\sim}300\;{\rm GHz}$) to a chip-scale mode-locked laser with a ${\sim}10\;{\rm GHz}$ repetition rate. By doing so, the 300 GHz optical frequency comb is optically divided by a factor of ${30} \times$ to 10 GHz. The stability of the mode-locked laser after regenerative harmonic injection locking is ${\sim}{10^{- 12}}$ at 1 s with a $1/\tau$ trend. To facilitate optical frequency division, a coupled opto-electronic oscillator is implemented to assist the injection locking process. This technique is exceptionally power efficient, as it uses less than $100\;\unicode{x00B5} {\rm W}$ of optical power to achieve stable locking.

© 2021 Optical Society of America

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