Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Delay Dynamics
DY 6.4: Talk
Monday, March 26, 2012, 15:45–16:00, MA 144
Dynamics of semiconductor lasers with delayed polarization-rotated feedback and its application for fast random bit generation — •Neus Oliver1, Miguel C. Soriano1, David W. Sukow2, and Ingo Fischer1 — 1Instituto de Física Interdisciplinar y Sistemas Complejos (IFISC) CSIC-UIB, Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain — 2Department of Physics and Engineering, Washington and Lee University, Lexington, Virginia 24450 USA.
Chaotic dynamics of semiconductor lasers has been proven attractive for fast random bit generation. Simple and robust systems, along with a systematic approach determining the required dynamical properties and most suitable conditions are key to achieve this goal. We show that the dynamics of a single mode laser with polarization-rotated feedback is very attractive for random bit generation. The delayed feedback induces dynamical instabilities characterized by a broad RF spectrum and corresponding chaotic dynamics of the output signal. We identify the optimal operating conditions and derive the sampling conditions to achieve randomness. Finally, we introduce a simple postprocessing procedure and study its role to enhance randomness. Applying the identified criteria, we achieve fast random bit generation rates up to multi-Gbit/s with a simple and robust system and minimal postprocessing requirements.