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We report the first demonstration of a long-distance ultra stable frequencydissemination in the microwave range. A 9.15 GHz signal is transferred througha 86-km urban optical link with a fractional frequency stability of 1.3x10-15at 1 s integration time and below 10-18 at one day. The optical link phasenoise compensation is performed with a round-trip method. To achieve such aresult we implement light polarisation scrambling and dispersion compensation.This link outperforms all the previous radiofrequency links and compares wellwith recently demonstrated full optical links.

High-resolution microwave frequency dissemination on an 86-km urban optical link