Quantum-Dot Laser Behavior under External Optical Feedback

Abstract

This work explores the bifurcation scenarios of the quantum-dot (QD) semiconductor laser with an external cavity (optical feedback) using a dimensionless model where the dynamics of the ground and the excited states are examined in addition to the wetting layer (WL). It is shown that while chaos was reasoned, mainly, to ground state (gs) dynamics at low injection current as a result of fast interdot relaxation, it is reasoned to WL at high injection due to saturation. Time series for WL, gs, and excited state (es), and the bifurcation diagram are examined at different parameters.