We demonstrate feedback and harmonic locking of chip-scale slot-type optomechanical oscillators to external low-noise reference clocks, with suppressed timing jitter by three orders of magnitude. The feedback and compensation techniques significantly reduce the close-to-carrier phase noise, especially within the locking bandwidth for the integral root-mean-square timing jitter. Harmonic locking via high-order carrier signals is also demonstrated with similar phase noise and integrated root-mean-square timing jitter reduction. The chip-scale optomechanical oscillators are tunable over an 80-kHz range by tracking the reference clock, with potential applications in tunable radio-frequency photonics platforms.
Feedback and harmonic locking of slot-type optomechanical oscillators to external low-noise reference clocks
Jiangjun Zheng, Ying Li, Noam Goldberg, Mickey McDonald, Xingsheng Luan, Archita Hati, Ming Lu, Stefan Strauf, Tanya Zelevinsky, David A. Howe, Chee Wei Wong; Feedback and harmonic locking of slot-type optomechanical oscillators to external low-noise reference clocks. Appl. Phys. Lett. 8 April 2013; 102 (14): 141117. https://doi.org/10.1063/1.4801473
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