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RF frequency transfer over an urban 86 km fibre has been demonstrated with aresolution of 2.10-18 at one day measuring time using an optical compensator.This result is obtained with a reference carrier frequency of 1 GHz, and arapid scrambling of the polarisation state of the input light in order toreduce the sensitivity to the polarisation mode dispersion in the fibre. Thelimitation due to the fibre chromatic dispersion associated with the laserfrequency fluctuations is highlighted and analyzed. A preliminary test of anextended compensated link over 186 km using optical amplifiers gives aresolution below 10-17 at 1 day.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

86-km optical link with a resolution of 2.10-18 for RF frequency transfer