An optical semiconductor device includes a substrate and an active region formed on the substrate. The active region includes a plurality of quantum well layers containing at least one tensile-strained well layer, and the plurality of quantum well layers include a plurality of quantum well layers whose...http://www.google.com/patents/US6288410?utm_source=gb-gplus-sharePatent US6288410 - Semiconductor optical device with tensile-strained quantum well structure
