Chaos secure communication based on free-running VCSEL system

Abstract In this paper, we propose a parallel injection chaotic system involving three vertical-cavity surface-emitting lasers (VCSELs). First, the chaotic synchronization performance of the system is evaluated using the cross-correlation function. Then, we analyze in detail the effects of injection strength, frequency detuning, and parameter mismatch on the chaotic synchronization and information transmission of the system. Numerical studies indicate that the proposed parallel injection chaotic system based on three VCSELs can achieve high-quality chaotic synchronization over a wide bandwidth and a broad range of input parameters. Furthermore, even in the case of parameter mismatch, high-quality chaotic synchronization and communication can still be achieved. Additionally, with appropriate injection strength, the system can compensate for the efficiency reduction caused by parameter mismatch.