Joint time-frequency analysis of chaos synchronization in a microchip laser array

Summary form only given. In recent years, chaotic communication has been demonstrated by synchronization of two chaotic oscillators. The chaotic amplitude fluctuation usually triggers phase diffusion. Our recent experiment in a mutually-coupled microchip laser array with self-feedback modulations showed that chaos synchronization can be established via a "phase-squeezing state". 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.