Abstract
We examine the dynamics of semiconductor lasers coupled in a ring configuration. The lasers, which have stable
output intensity when isolated, behave chaotically when coupled unidirectionally in a closed chain. In this way, we
show that neither feedback nor bidirectional coupling is necessary to induce chaotic dynamics at the laser output.
We study the synchronization phenomena arising in this particular coupling architecture and discuss its possible
application to chaos-based communications. Next, we extend the study to bidirectional coupling and propose an
appropriate technique to optical chaos encryption/decryption in closed chains of mutually coupled semiconductor
lasers.
© 2007 IEEE
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