Applied Physics B

, 97:541 | Cite as

Phase-coherent comparison of two optical frequency standards over 146 km using a telecommunication fiber link

  • O. TerraEmail author
  • G. Grosche
  • K. Predehl
  • R. Holzwarth
  • T. Legero
  • U. Sterr
  • B. Lipphardt
  • H. Schnatz
Open Access


We have explored the performance of two “dark fibers” of a commercial telecommunication fiber link for a remote comparison of optical clocks. The two fibers, linking the Leibniz University of Hanover (LUH) with the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, are connected in Hanover to form a total fiber length of 146 km. At PTB the performance of an optical frequency standard operating at 456 THz was imprinted to a cw transfer laser at 194 THz, and its frequency was transmitted over the fiber. In order to detect and compensate phase noise related to the optical fiber link we have built a low-noise optical fiber interferometer and investigated noise sources that affect the overall performance of the optical link. The frequency stability at the remote end has been measured using the clock laser of PTB’s Yb+ frequency standard operating at 344 THz.

We show that the frequency of a frequency-stabilized fiber laser can be transmitted over a total fiber length of 146 km with a relative frequency uncertainty below 1×10−19, and short term frequency instability given by the fractional Allan deviation of σ y (τ)=3.3×10−15/(τ/s).


06.30.Ft 42.62.Eh 42.81.Uv 


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Copyright information

© The Author(s) 2009

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (, which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • O. Terra
    • 1
    Email author
  • G. Grosche
    • 1
  • K. Predehl
    • 1
    • 2
  • R. Holzwarth
    • 2
  • T. Legero
    • 1
  • U. Sterr
    • 1
    • 3
  • B. Lipphardt
    • 1
  • H. Schnatz
    • 1
    • 3
  1. 1.Physikalisch-Technische BundesanstaltBraunschweigGermany
  2. 2.Max Planck Institute for Quantum OpticsGarchingGermany
  3. 3.Centre for Quantum Engineering and Space-Time Research (QUEST)HannoverGermany

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