Telecommunication fiber link for the remote characterization of a magnesium optical frequency standard

Osama Terra; Gesine Grosche; Wolfgang Ertmer; Thorsten Feldmann; Jan Friebe; Thomas Legero; Burghard Lipphardt; Andre Pape; Katharina Predehl; Ernst Rasel; Matthias Riedmann; Uwe Sterr; Temmo Wübbena; Harald Schnatz

doi:10.1117/12.825228

25 August 2009 Telecommunication fiber link for the remote characterization of a magnesium optical frequency standard

Osama Terra, Gesine Grosche, Wolfgang Ertmer, Thorsten Feldmann, Jan Friebe, Thomas Legero, Burghard Lipphardt, Andre Pape, Katharina Predehl, Ernst Rasel, Matthias Riedmann, Uwe Sterr, Temmo Wübbena, Harald Schnatz

Author Affiliations +

Proceedings Volume 7431, Time and Frequency Metrology II; 74310B (2009) https://doi.org/10.1117/12.825228
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We have characterized the ²⁴Mg optical frequency standard at the Institute of Quantum Optics (IQ), Hanover, using a clock laser at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, via a noise compensated 73 km fiber link and present preliminary results for the stability of the Mg standard. The stability of the clock laser (λ = 657 nm) is transferred with a femtosecond frequency comb to a telecommunication laser at λ = 1542 nm. The signal is then transmitted from PTB through the fiber link to IQ. A second comb at IQ (the remote end) is used to compare the transmitted laser frequency with that of the Mg clock laser λ = 914 nm. The frequency ratio of the clock lasers ν_Mg/ν_Ca shows a relative instability < 10^-14 at 1 s. The upper limit for the contribution of the fiber link to the frequency instability is measured by connecting another optical fiber following the same 73 km route at Hanover computer center. The comparison performed at PTB between the local and the transmitted signal after a round trip length of 146 km showed a relative uncertainty below 1 x 10^-19 and a short term instability σy(τ)= 3.3 x 10^-15 / (τ/s).

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Osama Terra, Gesine Grosche, Wolfgang Ertmer, Thorsten Feldmann, Jan Friebe, Thomas Legero, Burghard Lipphardt, Andre Pape, Katharina Predehl, Ernst Rasel, Matthias Riedmann, Uwe Sterr, Temmo Wübbena, and Harald Schnatz "Telecommunication fiber link for the remote characterization of a magnesium optical frequency standard", Proc. SPIE 7431, Time and Frequency Metrology II, 74310B (25 August 2009); https://doi.org/10.1117/12.825228

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