Bifurcations of n-homoclinic orbits in optically injected lasers

Sebastian Wieczorek, B Krauskopf

Research output: Working paperWorking paper and Preprints

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Abstract

We study in detail complex structures of homoclinic bifurcations in a three-dimensional rate-equation model of a semiconductor laser receiving optically injected light of amplitude K and frequency detuning w. Specifically, we find and follow in the (K,w)-plane curves of n-homoclinic bifurcations, where a saddle-focus is connected to itself at the n-th return to a neighborhood of the saddle. We reveal an intricate interplay of codimension-two double-homoclinic and T-point bifurcations. Furthermore, we study how these structures change with an additional parameter, the so-called linewidth enhancement factor alpha of the laser. In particular, we find folds (minima) of T-point bifurcation and double-homoclinic bifurcation curves, which are accumulated by infinitely many changes of the bifurcation diagram due to transitions through singularities of surfaces of homoclinic bifurcations. The injection laser emerges as a system that allows one to study codimension-two bifurcations of n-homoclinic orbits in a concrete vector field. At the same time, the bifurcation diagram in the (K,w)-plane is of physical relevance. An example is the identification of regions, and their dependence on the parameter alpha, of multi-pulse excitability where the laser reacts to a single small perturbation by sending out n pulses.
Original languageEnglish
DOIs
Publication statusPublished - 2003

Bibliographical note

Additional information: Later published by the Institute of Physics, Nonlinearity, 18, pp. 1095-1120, ISSN 0951-7715

Sponsorship: We thank Ale Jan Homburg for helpful discussions on the literature on codimension-two homoclinic bifurcations. The research of SW was funded by the US Department of Energy under contract DE{AC04{94AL8500, and by Vrije Universiteit Amsterdam.
The research of BK was supported by an Advanced Research Fellowship grant from the
Engineering and Physical Sciences research Council (EPSRC).

Terms of use: Nonlinearity © copyright 2005 IOP Publishing Ltd.

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