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 -long underground fiber link with a fractional instability of at , which is close to the theoretical limit for our transfer experiment. After , the relative uncertainty for the transfer is at the level of . Tests with a very short fiber show that noise in our stabilization system contributes fluctuations that are 2 orders of magnitude lower, namely, at , reaching after .
© 2009 Optical Society of America
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