Chaos synchronization in coupled semiconductor lasers of multiple modulated time delays

To exam the chaotic dynamics of multiple modulated delays system,the synchronization in multiple constant and modulated time delay chaotic lasers subject to incoherent optical feedbacks and incoherent optical injection is numerically investigated,in which the semiconductor lasers are subject to incoherent injection that fine tuning of optical frequency is not required.Furthermore,the autocorrelation function of the incoherent feedback semiconductor laser output is also investigated.The results indicate that high quality of synchronization can be obtained under both the cases.However,the signatures of time delays under modulated delays case can be hidden,which largely improves the system security and is important for the suitability of such laser systems for secure chaos-based communication systems.