Polarization-insensitive optical amplifiers using tensile-strained quantum wells

Polarization-control issue in the semiconductor laser amplifier (SLA) is very important for its integration with optics such as waveguide-based devices. So far, two types of approaches have been tried for the polarization insensitive amplification in the SLA. Propagation characteristics of active waveguide was controlled to accomplish polarization-insensitive amplification through a controlled optical confinements for TE- and TM-mode. A square …