Noise enhanced phase synchronization and coherence resonance in sets of chaotic oscillators with weak global coupling.
The effect of noise on phase synchronization in small sets and larger populations of weakly coupled chaotic oscillators is explored. Both independent and correlated noise are found to enhance phase synchronization of two coupled chaotic oscillators below the synchronization threshold; this is in contrast to the behavior of two coupled periodic oscillators. This constructive effect of noise results from the interplay between noise and the locking features of unstable periodic orbits. We show that in a population of nonidentical chaotic oscillators, correlated noise enhances synchronization in the weak coupling region. The interplay between noise and weak coupling induces a collective motion in which the coherence is maximal at an optimal noise intensity. Both the noise-enhanced phase synchronization and the coherence resonance numerically observed in coupled chaotic Rössler oscillators are verified experimentally with an array of chaotic electrochemical oscillators.
Kiss
István Z
IZ
Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741, USA.
Zhai
Yumei
Y
Hudson
John L
JL
Zhou
Changsong
C
Kurths
Jürgen
J
D004563:Electrochemistry; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D009991:Oscillometry; D055585:Physical Phenomena; D010825:Physics; D013997:Time Factors