Synchronizing spatiotemporal chaos of the coupled bistable map system using nonlinear feedback

In this paper we firstly study the synchronization of the spatially coupled acousto-optic bistable system using nonlinear feedback technology. Two cases are considered. The first is the same systems with the same parameters. The second is the same systems with the different parameters. The largest conditional Lyapunov exponent spectra are calculated. We give the minimum coupling strength of achieving the synchronization, and the functional relationship between the minimum coupling strength and the system parameters. This method is easy to implement in experiment since adjusting the coupled strength only. It has special importance in practical communication.