Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 47: Precision measurements and metrology II
Q 47.4: Vortrag
Donnerstag, 20. März 2014, 17:45–18:00, DO24 1.101
Optical Frequency Transfer over a 1840-km Fiber Link with superior Stability — •Stefan Droste1, Thomas Udem1, Theodor Hänsch1, Ronald Holzwarth1, Filip Ozimek2, Harald Schnatz2, and Gesine Grosche2 — 1Max-Planck-Institut für Quantenoptik — 2Physikalisch-Technische Bundesanstalt
The comparison of the latest generation of atomic frequency standards calls for new methods of transferring highly stable optical frequencies. Well established satellite-based frequency dissemination techniques do not reach the required stability set by state-of-the-art frequency standards. Recently, a lot of work has been put into investigating fiber links as a possible medium for transferring optical frequencies.
We established a fiber connection between the two institutes Max Planck Institute of Quantum Optics (MPQ) in Garching and the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. In a loop configuration we transferred an optical carrier frequency at 194 THz over a 1840 km long fiber link. By investigating the underlying noise structure we found an, until now, unconsidered noise type that leads to a tau−2 dependency in the modified Allan deviation. The instability of the transferred frequency drops below 10−18 after only 70 s and we found no systematic offset between the sent and transferred frequency within an uncertainty of about 3 × 10−19.