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Measurements of the pulse dynamics in a mode-locked laser show that gain dynamics must be included. The dynamical response of the timing and phase are measured using femtosecond comb techniques, allowing prediction of the width of the comb lines due to noise.
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 repetition frequency of 100 MHz).
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