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We report a method to determine propagation delays of optical 10 Gb/s datatraveling through a 75 km long amplified fiber link with an uncertainty of 4ps. The one-way propagation delay is determined by two-way exchange and crosscorrelation of short (< 1 ms) bursts of 10 Gb/s data, with a single-shot timeresolution better than 2.5 ps. We thus achieve a novel optical communicationslink suited for both long-haul high-capacity data transfer and time transferwith picosecond-range uncertainty. This opens up the perspective ofsynchronized optical telecommunication networks allowing picosecond-range timedistribution and millimeter-range positioning.

Delivering 10 Gb/s optical data with picosecond timing uncertainty over 75 km distance