Abstract

We present a feedback-control method for suppression of excess phase noise in the optical-to-electronic conversion process involved in the extraction of microwave signals from femtosecond mode-locked lasers. A delay-locked loop based on drift-free phase detection with a differentially biased Sagnac loop is employed to eliminate low-frequency (e.g., <1kHz) excess phase noise and drift in the regenerated microwave signals. A 10GHz microwave signal is extracted from a 200MHz repetition rate mode-locked laser with a relative rms timing jitter of 2.4fs (integrated from 1mHz to 1MHz) and a relative rms timing drift of 0.84fs (integrated over 8h with 1Hz bandwidth) between the optical pulse train and the extracted microwave signal.

© 2010 Optical Society of America

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