Journal
OPTICS LETTERS
Volume 35, Issue 12, Pages 2022-2024Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.002022
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Funding
- Sandia National Laboratories [777117]
- Defense Advanced Research Projects Agency (DARPA) [HR0011-05-C-0155, W911NF-04-1-0431]
- U.S. Air Force Office of Scientific Research (USAFOSR) [FA9550-07-1-0014]
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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., <1 kHz) excess phase noise and drift in the regenerated microwave signals. A 10 GHz microwave signal is extracted from a 200 MHz repetition rate mode-locked laser with a relative rms timing jitter of 2: 4 fs (integrated from 1 mHz to 1 MHz) and a relative rms timing drift of 0: 84 fs (integrated over 8 h with 1 Hz bandwidth) between the optical pulse train and the extracted microwave signal. (C) 2010 Optical Society of America
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