Optical frequency links have been demonstrated on distances up to 1840 km [1,2] and give the possibility to compare future optical clocks in Europe with sensitivity far beyond what doable with GPS. A key issue consists now in deploying optical links to a number of research laboratories for high sensitivity frequency measurement or remote laser stabilization for instance. In this context, a point-to-point transfer scheme is not efficient, especially in a metropolitan area network. Following a proposal by G. Grosche [3] one can extract the ultrastable signal at different points along the main link, in order to distribute the optical reference to many users simultaneously.

© 2015 IEEE

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