Abstract

In the past few years, the excitable behaviour of injected lasers has been the object of several studies [1]. The relevance of these studies extends beyond laser dynamics, because excitability is a quite generic feature of nonlinear systems, in particular of neurons [2]. The typical mechanism leading to excitability in injected lasers is a saddle-node bifurcation on a limit cycle, described by the Adler equation. The specific signature of this mechanism is a 2π phase jump accompanying each excitable pulse [3].

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