Phase-coherent frequency comparison of optical clocks using a telecommunication fiber link

We have explored the performance of 2 "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics...

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Bibliographic Details
Published in:	IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 57; no. 1; pp. 175 - 181
Main Authors:	Schnatz, Harald, Terra, Osama, Predehl, Katharina, Feldmann, Thorsten, Legero, Thomas, Lipphardt, Burghard, Sterr, Uwe, Grosche, Gesine, Holzwarth, Ronald, Hansch, Theodor W., Udem, Thomas, Lu, Zehuang H., Wang, Li J., Ertmer, Wolfgang, Friebe, Jan, Pape, Andre, Rasel, E.-M., Riedmann, Mathias, Wubbena, Temmo
Format:	Journal Article Conference Proceeding
Language:	English
Published:	New York, NY IEEE 01-01-2010 Institute of Electrical and Electronics Engineers
Subjects:	Clocks Coherence Computer-Aided Design Equipment Design Equipment Failure Analysis Exact sciences and technology Ferroelectric materials Frequency Lasers Links Measurements common to several branches of physics and astronomy Metrology, measurements and laboratory procedures Microwaves Optical attenuators Optical fiber cables Optical fiber communication Optical fiber devices Optical fiber networks Optical fiber polarization Optical Fibers Physics Reproducibility of Results Sensitivity and Specificity Telecommunications Telecommunications - instrumentation Time and frequency Time Factors Ultrafast optics Optical communication Frequency measurement Optical frequency Atomic standard Atomic clocks
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Summary:	We have explored the performance of 2 "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. These fibers establish a network in Germany that will eventually link optical frequency standards at PTB with those at the Institute of Quantum Optics (IQ) at the Leibniz University of Hanover, and the Max Planck Institutes in Erlangen (MPL) and Garching (MPQ). We demonstrate for the first time that within several minutes a phase coherent comparison of clock lasers at the few 10 -15 level can also be accomplished when the lasers are more than 100 km apart. Based on the performance of the fiber link to the IQ, we estimate the expected stability for the link from PTB to MPQ via MPL that bridges a distance of approximately 900 km.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0885-3010 1525-8955
DOI:	10.1109/TUFFC.2010.1395