Journal of Basic and Applied Research International
 

Journal of Basic and Applied Research International, ISSN No. : 2395-3438 (Print), 2395-3446 (Online), Vol.: 24, Issue.: 1

Original Research Article

STOCHASTIC RESONANCE IN A CHAOTIC SEMICONDUCTOR LASER

 

E. A. ABDULLAH1 AND K. A. M. AL NAIMEE2,3*

1Department o Physics, College of Science, University of Wasit, Wasit, Iraq.

2Istituto Nazionale di Ottica, Largo E. Fermi, 6, 50125, Florence, Italy.

3Department of Physics, College of Science, University of Baghdad, Al Jadiriyah, Baghdad, Iraq.

Abstracts

We  report  the experimental evidence of stochastic  and  coherence  resonance  in  a chaotic semiconductor  laser  with  optoelectronics  feedback.  Gaussian white noise has been applied to the laser chaotic output. The chaotic system becomes regular under a moderate noise level. In stochastic resonance, the noise serves to enhance the nonlinear system response to a weak regular perturbation. We have checked the feasibility of detection of weak periodic signals of different frequencies where the stochastic resonance is realized. In particular, we observed that the noise level should be increased when the modulating frequency is high. Results show that what plays a key role is the amplification of the modulating (perturbation) signal. In particular, this offers the ability to extract the periodic signal without synchronization in chaos communications. This fact opens new perspectives in chaos communications when the synchronization will not be required.

Keywords :

Stochastic; coherence; optoelectronic feedback; noise; resonance.