Abstract
Two mode-locked femtosecond fiber lasers, connected via a fiber link, are synchronized to an rms timing jitter of , observed over the entire Nyquist bandwidth (half of the 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 . Second, using a wide bandwidth interactivity actuator, the slave laser is synchronized to the incoming stable pulse train from the reference laser to within . 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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