Dynamic Operation of Planar Waveguide LASER with 2D Photonic Crystal

Abstract

We present an analysis of dynamic operation of planar waveguide laser in which modal confinement in lateral direction is provided by 2D photon crystal of square lattice. In our theoretical model, we take into account the gain saturation effect, transverse and longitudinal field distribution. We consider laser structures with F-P and DFB cavities. That model allows to define in an easy way the influence of real structure parameters such as photonic crystal geometry, waveguide geometry, losses as well as strength of feedback on the damping rate and the frequency of relaxation oscillations and 3 dB modulation bandwidth. With the help of this model it is possible to define optimal geometry of the laser structures having F-P and DFB cavities, which provides maximal modulation bandwidth for a given pumping level (characterized by small signal gain).