Abstract

In recent years, chaotic communication has been demonstrated by synchronization of two chaotic oscillators. The chaotic amplitude fluctuation usually triggers phase diffusion. Most recently, phase synchronization phenomena, in which amplitude correlation between two oscillators is absent but their phases are in step with a common timing characteristics [1]. Such phase correlation retrieval is important in a chaotic communication scheme that uses the natural symbolic dynamics of chaos Our recent experiment in a mutually-coupled microchip LNP laser array with self-feedback modulations showed that chaos synchronization can be established via a “phase-squeezing state” [2] Previous characterizations of chaos synchronization have been, however, restricted to amplitude and phase correlations of the intensities of two chaotic signals In this study, we propose a new methodology that is based on a joint time-frequency analysis (JTFA) for extracting hidden dynamics inherent in chaos synchronization

© 2000 IEEE