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Splitting in the pinning-depinning transition of fronts in long-delayed bistable systems
Francesco Marino1, Giovanni Giacomelli2, Stephane Barland3
1CNR-Istituto Nazionale di Ottica, largo E. Fermi 6, I-50125 Firenze, Italy.
Abstract:
We investigate the formation of localized domains through front pinning in a periodically forced, bistable semiconductor laser with long-delayed optoelectronic feedback. At difference with 1D spatially extended systems, the transition from the pinning to the propagation regime occurs via two separated bifurcations, each corresponding to the unpinning of one of the fronts surrounding the localized domain. The bifurcation splitting is systematically explored, unveiling the crucial role played by the forcing frequency. The experimental results are reproduced and interpreted by means of a prototypical model of our system.
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