Exploring noise effects in chaotic optical networks

Year: 2017

Authors: Rasheed B.O., Abdalah S.F., Al Naimee K.A.M., Al Hasani M.H., Aljaff P.M., Meucci R., Arecchi F.T.

Autors Affiliation: Department of Physics, College of Science, Sulaimani University, Sulaimani, Iraq; Istituto Nazionale di Ottica, Largo E. Fermi 6, Firenze, 50125, Italy; Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq; Università degli Studi di Firenze, Firenze, Italy

Abstract: We report the experimental evidence coherence and stochastic resonance in a dynamics of fast chaotic spiking of a semiconductor laser with optical feedback using an external nonwhite noise in the pumping current. We characterize both coherence and stochastic resonance in the time and frequency domain. We show that the regularity of the chaotic pulses in the intensity of laser diod increases when adding noise and it is optimal for some intermediate value of the noise intensity. We find that the power spectrum of the signal develops a peak at a finite frequency at intermediate values of the noise. The results show that noise may help in extracting the periodic signal without synchronization in chaotic communication. Then we reported the effect of external noise numerically on a single system by using bifurcation diagram. Finally, we considered Chaos synchronization in a network of 28 distinct chaotic systems with independent initial conditions when a normal Gaussian noise is added. The transition between non-synchronization to synchronization states using a suitable spatio-temporal representation has been reported. The role of coherence has also been considered.


Volume: 7      Pages from: 1743  to: 1750

KeyWords: Coherence resonance; Control; Noise; Stochastic resonance
DOI: 10.1016/j.rinp.2017.05.014

Citations: 5
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