DYNAMIC BEHAVIOR AND LOCKING OF A SEMICONDUCTOR-LASER SUBJECTED TO EXTERNAL INJECTION

In this paper, we analyze the phenomena arising when a monomode semico nductor laser is subjected to external injection from another laser. T he system stability is investigated as a function of detuning and of t he relative injected power. Different regimes, spanning from phase loc king to chaos and coherence collapse, are described by analytical and numerical methods for weak and moderate injection. Previous theoretica l studies are extended by describing the inverse transition from chaos to stability and by deriving the final locking condition. Also, furth er investigation on the coherence collapse regime has been performed. Besides contributing to the exploration of an interesting fundamental phenomenon, the results of this analysis are useful for different appl ications, including coherent detection and chaotic cryptography.