Dynamic Behavior of Directly Modulated Semiconductor Laser Utilizing Optical Feedback

Abstract

In this work, dynamical behavior of directly modulated semiconductor laser utilizing opticalfeedback has been simulated using MATLAB software package. The results show that the carrierdensity and photon numbers have been increased with external optical feedback (externalcavity). The effect of external mirror reflectivity on the output power has been studied and it’sfound that as the reflectivity increased the output power was increased. Also, the effect of distancebetween semiconductor laser cavity and the optical external cavity has been studied andthe maximum output power has been obtained at an external length of (0.7- 0.75) cm.