Modeling of Planar Waveguide Quantum Dot Laser with Safely Submarine and Fiber Optic Communications

In this paper, simulation and modeling of Quantum Dot (QD) laser with planar cavity is implemented based on a set of rate equations for carriers and photons. This modeling is done with the purpose of using quantum dot lasers with different wavelengths in submarine and fiber optical communications with high security. The rate equations are solved in five energy states using 4th order Runge-Kutta method. It can be seen that increase in injected current of the laser active region results in decrease of switching time and stability time of the system and power peak and stationary state powers will be increased. By computing P-I curve, it is recognized that by decreasing carrier relaxation times to lower states, injection current can be decreased. Also, exponential dependence of laser switching time to injection current is shown.