Novel gain mechanism in an optically modulated single quantum well semiconductor laser

The authors demonstrated that the active layer photomixing technique produces parasitic-free modulation in semiconductor lasers. Their use of this modulation technique in a single quantum well (SQW) laser structure has revealed an optical gain effect. When optically pumping a small region of the active layer, they measured output modulation power up to 4.0 times larger than the absorbed optical input power. In this paper, they report these experimental results and propose a theoretical explanation. The experimental arrangement is shown