Recent technological progress brings into reach stable compact
multisections semiconductor lasers. Such devices may be very
suitable for chaotic secure communication. We report results
of numerical investigations of the dynamical behaviour of
continuous-wave semiconductor lasers under the influence
of a multiple feedbacks. The optimal conditions for chaos
generation are identified. The comparison of the dynamics
of this configuration with that of conventional optical
feedback is presented. Synchronization of two unidirectional
coupled (master-slave) semiconductor lasers is studied. We
report also on the influence of parameters mismatch on
the synchronization quality and show how the features of
the external cavities have an influence on the laser behaviour.
Finally, examples of message encoding and decoding are presented.
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