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Opt Lett. 2009 Apr 1;34(7):965-7.

Atmospheric transfer of optical and radio frequency clock signals.

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  • 1Max-Planck Research Group, Institute of Optics, Information and Photonics, University Erlangen-Nuremberg, Erlangen, Germany.


The phase instability induced during the transfer of radio frequency and optical clock signals through the turbulent atmosphere was measured in a rooftop experiment. Radio frequency intensity modulation of a laser to transmit signals over 100 m results in an Allan deviation of 1.31x10(-10) at 1 s. Optical transfer is more accurate at 1.68x10(-13) at 1 s. As a consequence, fiber links are more suitable for the transfer of optical frequencies over very long distances while free space transmission might find applications in short distances of less than 1 km.

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