Effect of short and long delay times on closed loop system of quantum dot semiconductor lasers

Basim Abdullattif Ghali; Rajaa Hussein Abd Ali; Amin H. Al-Khursan

Basim Abdullattif Ghali Laser Physics Department, Science College for Women, Babylon University, Hilla, Iraq
Rajaa Hussein Abd Ali Physics Department, Science College, University of Kerbala, Karbala, Iraq
Amin H. Al-Khursan Nassiriya Nanotechnology Research Laboratory (NNRL), Science College, Thi-Qar University, Nassiriya, Iraq

Keywords: Quantum dot, attractors, semiconductor laser, optical feedback, linewidth enhancement factor, nonlinear dyna

Abstract

A closed-loop system (CLS) of quantum dot semiconductor laser (QDL) with optical feedback is theoretically studied in this work. The CLS studied under two types of time delay (short and long). The system transit to chaos under short delay times, which important in secure optical communications. A complete synchronization was obtained at long delay time which is also important in the of coding and decoding for communication security applications.