Abstract

Two mode-locked femtosecond fiber lasers, connected via a 7km fiber link, are synchronized to an rms timing jitter of 19fs, observed over the entire Nyquist bandwidth (half of the 93MHz repetition frequency). This result is achieved in two steps. First, active cancellation of the fiber-transmission noise reduces timing jitter caused by path length fluctuations to a record level of 16fs. Second, using a wide bandwidth interactivity actuator, the slave laser is synchronized to the incoming stable pulse train from the reference laser to within 10fs. These results are confirmed by an optical cross-correlation measurement performed independently of the feedback loop operated in the microwave domain.

© 2006 Optical Society of America

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