Noise synchronisation and stochastic bifurcations in lasers

Details Noise synchronisation and stochastic bifurcations in lasers Noise synchronisation and stochastic bifurcations in lasers

2011-04-20

arxiv.org/abs/1104.4052v1

Mathematics

Dynamical Systems

14 pages, 10 figures

Scientific paper

This paper studies noise synchronisation in terms of random pullback attractors and their instabilities. We consider an ensemble of uncoupled lasers, each being a limit-cycle oscillator, which are driven by the same external white Gaussian noise. As the external-noise strength increases, there is an onset of synchronization and then subsequent loss of synchrony. Local analysis of the laser equations shows that synchronization becomes unstable via stochastic bifurcation to a random strange attractor. The locus of this bifurcation is calculated in the three-dimensional parameter space defined by the Hopf parameter, amount of amplitude-phase coupling or shear, and external-noise strength. The analysis uncovers a square-root law for this stochastic bifurcation.

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