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Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider

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Abstract

We present an optical frequency divider based on a 200MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic microwave oscillators. At 1Hz offset from a 10GHz carrier, the phase noise is below 100dBc/Hz, limited by the optical reference. For offset frequencies >10kHz, the phase noise is shot noise limited at 145dBc/Hz. An analysis of the contribution of the residual noise from the Er:fiber optical frequency divider is also presented.

© 2011 Optical Society of America

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