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Optical-fiber pulse rate multiplier for ultralow phase-noise signal generation

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Abstract

In this Letter we report on an all optical-fiber approach to the synthesis of ultralow-noise microwave signals by photodetection of femtosecond laser pulses. We use a cascade of Mach–Zehnder fiber interferometers to realize stable and efficient repetition rate multiplication. This technique increases the signal level of the photodetected microwave signal by close to 18dB. That in turn allows us to demonstrate a residual phase-noise level of 118dBc/Hz at 1Hz and 160dBc/Hz at 10MHz from a 12GHz signal. The residual noise floor of the fiber multiplier and photodetection system alone is around 164dBc/Hz at the same offset frequency, which is very close to the fundamental shot-noise floor.

© 2011 Optical Society of America

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