Journal
OPTICS LETTERS
Volume 34, Issue 15, Pages 2270-2272Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.002270
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB407]
- Centre for Quantum Engineering and Space-Time Research (QUEST)
- European Space Agency
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We demonstrate the long-distance transmission of an ultrastable optical frequency derived directly from a state-of-the-art optical frequency standard. Using an active stabilization system we deliver the frequency via a 146-km-long underground fiber link with a fractional instability of 3 x 10(-15) at 1 s, which is close to the theoretical limit for our transfer experiment. After 30,000 s, the relative uncertainty for the transfer is at the level of 1 x 10(-19). Tests with a very short fiber show that noise in our stabilization system contributes fluctuations that are 2 orders of magnitude lower, namely, 3 x 10(-17) at 1 s, reaching 10(-20) after 4000 s. (C) 2009 Optical Society of America
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