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Applied Physics B

, Volume 117, Issue 3, pp 979–986 | Cite as

High-accuracy coherent optical frequency transfer over a doubled 642-km fiber link

  • D. Calonico
  • E. K. Bertacco
  • C. E. Calosso
  • C. Clivati
  • G. A. Costanzo
  • M. Frittelli
  • A. Godone
  • A. Mura
  • N. Poli
  • D. V. Sutyrin
  • G. Tino
  • M. E. Zucco
  • F. Levi
Article

Abstract

To significantly improve the frequency references used in radio-astronomy and the precision measurements in atomic physics, we provide frequency dissemination through a 642-km coherent optical fiber link. On the frequency transfer, we obtained a frequency instability of \(3\times 10^{-19}\) at 1,000 s in terms of Allan deviation on a 5-mHz measurement bandwidth, and an accuracy of \(5\times 10^{-19}\). The ultimate link performance has been evaluated by doubling the link to 1,284 km, demonstrating a new characterization technique based on the double round trip on a single fiber. This method is an alternative to previously demonstrated techniques for link characterization. In particular, the use of a single fiber may be beneficial to long hauls realizations in view of a continental fiber network for frequency and time metrology, as it avoids the doubling of the amplifiers, with a subsequent reduction in costs and maintenance. A detailed analysis of the results is presented, regarding the phase noise, the cycle-slips detection and removal and the instability evaluation. The observed noise power spectrum is seldom found in the literature; hence, the expression of the Allan deviation is theoretically derived and the results confirm the expectations.

Keywords

Global Navigation Satellite System Phase Noise Very Long Baseline Interferometry Amplify Spontaneous Emission Optical Link 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Gesine Grosche and Paul-Eric Pottie for technical help, Giorgio Santarelli for useful discussions, and the GARR Consortium for technical help with the fibers. This work was supported by: the Italian Ministry of Research MIUR under the Progetti Premiali programme and the PRIN09-2009ZJJBLX project; the European Metrology Research Programme (EMRP) under SIB-02 NEAT-FT. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • D. Calonico
    • 1
  • E. K. Bertacco
    • 1
  • C. E. Calosso
    • 1
  • C. Clivati
    • 1
  • G. A. Costanzo
    • 1
    • 2
  • M. Frittelli
    • 1
  • A. Godone
    • 1
  • A. Mura
    • 1
  • N. Poli
    • 3
  • D. V. Sutyrin
    • 3
  • G. Tino
    • 3
  • M. E. Zucco
    • 1
  • F. Levi
    • 1
  1. 1.Istituto Nazionale di Ricerca Metrologica INRIMTurinItaly
  2. 2.Politecnico di TorinoTurinItaly
  3. 3.Università di Firenze, LENS and INFNSesto FiorentinoItaly

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