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Balanced optical–microwave phase detectors for optoelectronic phase-locked loops

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Abstract

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, 3fs in-loop relative timing jitter (integrated from 1Hzto10MHz) between a 44MHz optical pulse train and a 10.225GHz microwave signal is demonstrated.

© 2006 Optical Society of America

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