All-optical modulation using an <i>n</i>-doped quantum-well structure

Abstract

The modulation of interband-resonant light by intersubband-resonant light using an n-doped quantum well is proposed, and results of the theoretical analysis are reported. It is shown that a large change in absorption coefficient from 100 to 3160 cm−1 for interband-resonant light can be obtained by changing the intensity of intersubband-resonant light from 0 to 1 MW/cm2. Very fast modulation speed (∼ps) can be expected.