Abstract

Optical communications using laser chaos have been intensively investigated for applications of secure communications and spread spectrum communications [1]. Synchronization of chaos is a key technique for chaos communications to share the same chaos in the transmitter and the receiver. However, since these studies are limited to a single pair of lasers, these methods cannot be applied for multi-user communication systems such as spread spectrum communications. Multiplexing chaos using dual synchronization has been reported to synchronize two different pairs of chaotic systems separately, such as a one-dimensional map and delay-differential equations [2]. Although it has been shown theoretically in Ref. [2] that it is possible to synchronize each pair of multiplexed chaotic oscillators, these multiplexing synchronization methods have not been applied to chaos in laser experiments. It is very important to investigate synchronization of multiplexing chaos in laser systems for multi-user optical communications that use chaos.

© 2003 Optical Society of America