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

Harald Schnatz*, Osama Terra, Katharina Predehl, Thorsten Feldmann, Thomas Legero, Burghard Lipphardt, Uwe Sterr, Gesine Grosche, Ronald Holzwarth, Theodor W. Hänsch, Thomas Udem, Zehuang H. Lu, Li J. Wang, Wolfgang Ertmer, Jan Friebe, Andrè Pape, Ernst-M. Rasel, Mathias Riedmann, Temmo Wübbena

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)175-181
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume57
Issue number1
DOIs
Publication statusPublished - Jan 2010
Externally publishedYes

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