Dynamics of quantum dot light-emitting diode with filtered optical feedback

Abstract

We study a quantum dot light-emitting diodes (QD-LEDs) subject to filtered optical feedback, where the filter is characterized by a mean frequency Ωm and a filter width λ. In the limit of a narrow filter (λ = 0), the QD-LED equations reduce under some conditions to the equations for a QD-LED with optical feedback, whereas they become the Lang Kobayashi equations in the limit of an unbounded filter width (λ > 0). Through simulations based on the rate equations for a QD-LED with filtered external optical feedback modes, we show that the output’s nonlinear dynamical system attractors can be controlled through the filter parameters: the filter’s spectral width λ and its central frequency Ωm. This is illustrated for a filter-induced global bistability.