Optical gain in one-dimensional photonic band gap structures with n-i-p-i crystal layers

Abstract

The gain enhancement in a layered periodic pho- tonic band gap structure containing active medium based on GaAs n-i-p-i superlattices separated by AlGaAs layers is ana- lyzed. The dependences of extinction coefficient and refractive index on excitation level and wavelength are presented. Trans- mission characteristics of a probe light versus excitation level are calculated. It is shown that the threshold of generation can be essentially reduced if the wavelength of probe light falls to the band gap edge.