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Long-term stable timing transfer over a multi-km fiber network is reported. Output of two independently timing-stabilized fiber links shows only 0.73 femtoseconds RMS total jitter over 35 hours corresponding to 10−21 relative link stability.
We present recent progress made in optical, high-precision, long-term stable timing distribution systems for synchronization of next generation X-ray free-electron lasers. Timing jitter characterization of the optical master oscillator shows less than 170 as integrated jitter for frequencies above 10 kHz, limited by the detection noise floor. Timing stabilization of a 3.5-km polarization maintaining...
A 1.2-km timing-stabilized, polarization-maintaining fiber link based on balanced optical cross-correlation was demonstrated with ∼0.9 fs RMS timing jitter over 16 days and ∼0.2 fs RMS timing jitter over 3 days.
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