Journal
OPTICS LETTERS
Volume 31, Issue 24, Pages 3659-3661Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.31.003659
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A balanced optical-microwave phase detector for the extraction of low-jitter, high-power, and drift-free microwave signals from optical pulse trains is presented. The phase detection is based on electro-optic sampling with a differentially biased Sagnac loop. Because the timing information is transferred in the optical domain, the regenerated microwave signal is robust against drifts and photodetector nonlinearities. In a first experimental implementation, 3 fs in-loop relative timing jitter (integrated from 1 Hz to 10 MHz) between a 44 MHz optical pulse train and a 10.225 GHz microwave signal is demonstrated. (c) 2006 Optical Society of America.
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