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Direct chip-scale optical frequency divider via regenerative harmonic injection locking

https://doi.org/10.1364/OL.413335

Bustos-Ramirez, Ricardo ; Trask, Lawrence R. ; Bhardwaj, Ashish ; Hoefler, Gloria E. ; Kish, Fred A. ; Delfyett, Peter J. ( February 2021 , Optics Letters)

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 ( $\sim<#comment/> 300 G H z$ ) to a chip-scale mode-locked laser with a $\sim<#comment/> 10 G H z$ repetition rate. By doing so, the 300 GHz optical frequency comb is optically divided by a factor of $30 \times<#comment/>$ to 10 GHz. The stability of the mode-locked laser after regenerative harmonic injection locking is $\sim<#comment/> 10^{-<#comment/> 12}$ at 1 s with a $1 / τ<#comment/>$ 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 $100 µ<#comment/> W$ of optical power to achieve stable locking.

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