Excitability of chaotic transients in a semiconductor laserO. V. Ushakov1, N. Korneyev1, M. Radziunas2, H. J. Wünsche1 and F. Henneberger1
1 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
received 27 April 2007; accepted in final form 19 June 2007; published August 2007
published online 17 July 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.
05.45.-a - Nonlinear dynamics and chaos.
42.55.Px - Semiconductor lasers; laser diodes.
05.45.Jn - High-dimensional chaos.
© Europhysics Letters Association 2007