Abstract
Recent technological progress brings into reach stable compact multisections semiconductor lasers. Such devices may be very suitable for chaotic secure communication [1,2]. We report results of numerical and experimental investigations of the dynamical behaviour of continuous-wave semiconductor lasers under the influence of a multiple feedbacks (see Figure 1 left panel). The system consists of DFB laser coupled to two external phase sections and an airgap section. The external phase sections can be driven independently. We show that multiple feedbacks lead to a more complex behaviour which, in fact, is already indicated when looking at the number and location of the fixed points [3]. In the present study, the laser dynamics is analyzed in the framework of the extended Lang-Kobayashi equations for the complex field amplitude and excess carrier density [4]. The optimal conditions for chaos generation are identified and a comparison of the dynamics of this configuration with that of conventional optical feedback is presented. A good agreement is obtained between measurements and theoretical simulations.
© 2009 IEEE
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