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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology II
Q 14.6: Vortrag
Dienstag, 9. März 2010, 15:30–15:45, A 310
Frequency dissemination using a wide-area telecommunication fiber link — •Osama Terra1, Gesine Grosche1, Katharina Predehl2, Ronald Holzwarth2, and Harald Schnatz1 — 1Physikalisch-Technische Bundesanstalt, Braunschweig,Germany — 2Max Planck Institute for Quantum optics, Garching, Germany
Optical frequency standards can reach a relative uncertainty below 10−16 and an instability of 10−15/(τ1/2/s). For the dissemination of such a stable frequency, an optical fiber link provides a promising technique which avoids degradation of frequency stability and accuracy when used with a system that compensates temperature fluctuations and acoustic perturbations of the optical fiber. We have investigated the performance of a 146 km telecommunication fiber link to transfer such stable frequencies. We have transferred the stability of a clock laser at PTB to a telecommunication laser at λ = 1542 nm and measured its stability at the remote end of the fiber. The comparison performed at PTB between the local and the remote signal showed a relative uncertainty below 1 × 10 −19 and an instability of σy(τ)= 3.3 × 10−15/(τ/s), limited by the time delay introduced by the link. We are currently establishing a 900 km fiber link between PTB and MPQ. The transmitted signal has to be amplified several times to maintain the required power level and SNR. Bidirectional EDFAs that amplify the signal typically every 100 km are used at the moment. We additionally studied the performance of Brillouin amplifiers to bridge larger distances in one step.