Volume 79, Number 3, August 2007
|Number of page(s)||5|
|Published online||17 July 2007|
Excitability of chaotic transients in a semiconductor laser
Institut für Physik, Humboldt-Universität zu Berlin - Newtonstr.15, 12489 Berlin, Germany
2 Weierstraß-Institut für Angewandte Analysis und Stochastik - Mohrenstrasse 39, 10117 Berlin, Germany
Accepted: 19 June 2007
Using a semiconductor laser with integrated optical feedback, excitability of high-dimensional chaotic transients is demonstrated in a continuous and autonomous system. The generic phase-space portrait behind our observation consists in a boundary crisis of a chaotic attractor with a saddle born in a saddle-node bifurcation of continuous-wave states. The excitation of the chaotic transients, performed by short optical pulses, exhibits a distinct threshold as well as a refractory time. The escape from the chaotic saddle is strictly single-exponential and the escape time is an inverse-power function of the the distance to the boundary crisis with —despite of high dimensionality— a critical exponent close to unity. The device is capable of emitting pulses with a delay that is more than two orders of magnitude longer than the time scale of the internal carrier-photon dynamics.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 42.55.Px – Semiconductor lasers; laser diodes / 05.45.Jn – High-dimensional chaos
© Europhysics Letters Association, 2007
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