Chaos based communications using on-off shift keying method

Abstract

We discuss the dynamical behavior of a single mode semiconductor laser under the influence of multiple optical feedbacks. It is shown that the system displays, under certain conditions, chaotic behaviours appropriate for chaos based communications. The synchronization of two unidirectional coupled (master-slave) systems is also studied. Finally, the conditions for message encoding by using the on/off phase shift keying encryption method are identified and examples of message encoding/decoding are presented.