Issue
EPL
Volume 81, Number 4, February 2008
Article Number 40005
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/81/40005
Published online 21 January 2008
EPL, 81 (2008) 40005
DOI: 10.1209/0295-5075/81/40005

Experimental demonstration of bidirectional chaotic communication by means of isochronal synchronization

A. Wagemakers, J. M. Buldú and M. A. F. Sanjuán

Nonlinear Dynamics and Chaos Group, Departamento de Física, Universidad Rey Juan Carlos Tulipán s/n, 28933 Móstoles, Madrid, Spain

alexandre.wagemakers@urjc.es
miguel.sanjuan@urjc.es

received 17 September 2007; accepted in final form 17 December 2007; published February 2008
published online 21 January 2008

Abstract
We give the first experimental demonstration of simultaneous bidirectional communication through chaotic carriers thanks to the phenomenon of isochronal synchronization. Two Mackey-Glass electronic circuits with chaotic behaviour exchange their signals through a coupling line with delay. When the internal feedback of the circuits and the coupling are accurately matched, isochronal synchronization arises. Under this dynamical regime, we introduce a binary message at both outputs and recover it at the opposite circuit. Finally, we discuss the security of this kind of communication system by analyzing the message recovered by a potential eavesdropper.

PACS
05.45.Xt - Synchronization; coupled oscillators.
42.55.Px - Semiconductor lasers; laser diodes.
42.65.Sf - Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics.

© EPLA 2008