Two-states quantum dot laser complex dynamics under optically injection

The rate equation is offered to notionally inspect the nonlinear dynamics of two-state quantum dot laser. It was tested for the first time to describe the effect of optical injection (OI). The proposed model was studied numerically using MATLAB. The simulation results showed that the ground state and the excited state, of the TSQDL can be excited at the same time. A quantum dot semiconductor laser subject to optical feedback was used to be the effecting laser (the master). It has a strong effect on the TSQDL to change its stable behavior to a rich in nonlinear dynamics, including the steady state, periodic oscillations, period doubling, periodic quadrilateral, and chaos. The effect of the optical feedback strength and optical feedback delayed time on the performance and quantitative behavior of the bifurcation in the TSQDL output was studied, taking into account changing the bifurcation parameters, injection strength k, frequency detuning ∆ω, and delay time \(\tau_{s}\) ${\tau }_s$ . The dynamics of the behavior of the two laser GS and ES, outputs each time was studied and compared with the behavior of the master and illustrated through the corresponding time series of bifurcation and probability of the time interval spikes (ISI). This indicates that QD is less sensitive to external influences, and if photons flow into it, it changes in a specific area. It can be observed that secondary peaks appear in the GS state, which has a low threshold energy (more involved), while the excited state has a higher energy (more distinct).