Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Laser development and applications IV

Q 23.1: Vortrag

Dienstag, 18. März 2014, 14:00–14:15, DO26 207

New Precision in Frequency Dissemination over 920 km Fiber Link Using Optimized Digital Compensation — •Alexey Grinin, Stefan Droste, Thomas Udem, Theodor Hänsch, and Ronald Holzwarth — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

The increasing performance of optical 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.
Previously, analog PI controllers have been used for Doppler shift cancellation in the 920 km long fiber connection between Max-Planck-Insitute of Quatum Optics and the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. The long time delay of almost 10 ms due to the final speed of light makes it impossible to control the system optimally in this way restricting the precision of frequency dissemination.
Higher order digital infinite response filters (IIR) have been applied for that task leading to a precision improvement of almost one order of amplitude. Optimization of filter coefficients have been performed using automatic numerical algorithms.