Synchronization of mode-locked femtosecond lasers through a fiber link

Darren D. Hudson*, Seth M. Foreman, Steven T. Cundiff, Jun Ye

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Two mode-locked femtosecond fiber lasers, connected via a 7 km fiber link, are synchronized to an rms timing jitter of 19 fs, observed over the entire Nyquist bandwidth (half of the 93 MHz 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 16 fs. Second, using a wide bandwidth interactivity actuator, the slave laser is synchronized to the incoming stable pulse train from the reference laser to within 10 fs. These results are confirmed by an optical cross-correlation measurement performed independently of the feedback loop operated in the microwave domain.

Original languageEnglish
Pages (from-to)1951-1953
Number of pages3
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2006
Externally publishedYes


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