Numerical simulations of dynamics of quantum dots lasers under the influence of t-type external optical feedback. Applications to chaos based communication

Abstract

We report the results of numerical simulations on the dynamical behavior of quantum dots laser subject to T-type optical feedback. We find that under certain conditions, due to the influence of the external feedback, the system displays strong chaotic behaviour appropriate for chaos-based communications. We demonstrate the influence of the relevant device parameters, such as feedback phases and strengths on the laser dynamics. The synchronization features of two quantum dots lasers coupled unidirectionally are studied numerically. Finally, we find the appropriate conditions for high bit rate message encoding by chaos modulation technique using compact quantum dots lasers under the influence of T-type feedback loops.