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OCIS codes: (060.2360) Fiber optics links and subsystems; (060.2420) Fibers, polarizationmaintaining; (120.4825) Optical time domain reflectometry; (140.4050) Mode-locked lasers; (190.7110) Ultrafast nonlinear optics; (230.2035) Dispersion compensation devices
Abstract:
Long-term stable timing distribution over a 3.5-km polarization maintaining (PM) fiber link using balanced optical cross-correlators (BOC) for optical-to-optical synchronization is demonstrated. Remote laser synchronization over 40 hours showed a residual timing jitter and drift of 2.5 fs for the whole locking period and only 1.1 fs integrated from 100 μHz to 1 MHz. This result corresponds to the lowest jitter and drift achieved to date for a multi-km fiber link and remote timing synchronization operating continuously over multiple days.
