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., ) excess phase noise and drift in the regenerated microwave signals. A microwave signal is extracted from a repetition rate mode-locked laser with a relative rms timing jitter of (integrated from to ) and a relative rms timing drift of (integrated over with bandwidth) between the optical pulse train and the extracted microwave signal.
© 2010 Optical Society of America
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