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.

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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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