Abstract

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 3×1015 at 1s, which is close to the theoretical limit for our transfer experiment. After 30,000s, the relative uncertainty for the transfer is at the level of 1×1019. Tests with a very short fiber show that noise in our stabilization system contributes fluctuations that are 2 orders of magnitude lower, namely, 3×1017 at 1s, reaching 1020 after 4000s.

© 2009 Optical Society of America

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