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High-precision optical pulse trains distribution via fibre links has madehuge impacts in many fields. In most published works, the accuracies are stillfundamentally limited by some unavoidable noises, such as thermal and shotnoise from conventional photodiodes, thermal noise from mixers. Here, wedemonstrate a new high-precision timing distribution system by usinghighly-precision phase detector to overcome the limitations. Instead of usingphotodiodes and microwave mixers, we use several fibre Sagnac-loop-basedoptical-microwave phase detectors to realize optical-electrical conversion andphase measurements, for suppressing the noises and achieving ultra-highaccuracy. A 10-km fibre link distribution experiment shows our system providesa residual instability at the level of 4.6*10-15@1-s and 6.1*10-18@10000-s,with an integrated timing jitter as low as 3.8 fs in a bandwidth of 1 Hz to 100KHz. This low instability and timing jitter makes it possible that our systemcan be used in the optical clock distribution or the applications for thefacilities which require extremely accuracy frequency time synchronization.

High-precision Distribution of Highly-stable Optical Pulse Trains with Sub-10-fs Timing Jitter