Abstract

Long-term synchronization between two 10.225 GHz microwave signals at +10 dBm power level, locked to a 44.26 MHz repetition rate passively mode-locked fiber laser, is demonstrated using balanced optical-microwave phase detectors. The out-of-loop measurement result shows 12.8 fs relative timing jitter integrated from 10 Hz to 10 MHz. Long-term timing drift measurement shows 48 fs maximum deviation over one hour, mainly limited by drift of the out-of-loop characterization setup itself. To the best of our knowledge, this is the first time to demonstrate long-term (>1 hour) 3 mrad-level phase stability of a 10.225 GHz microwave signal extracted from a mode-locked laser.

© 2007 Optical Society of America

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History
Original Manuscript: May 7, 2007
Manuscript Accepted: June 27, 2007
Revised Manuscript: June 13, 2007
Published: July 5, 2007

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Author Affiliations

F. Ludwig, M. Felber

DESY

J. Kim

Massachusetts Institute of Technology

F. X. Kärtner

MIT

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