Semiconductor quantum dot (QD) lasers and optical amplifiers have drawn much attention due to expected performance improvement over quantum well (QW) lasers and amplifiers.GaAs-based 1.3-1.55 um vertical-cavity surface-emitting lasers (VCSELs) and semiconductor optical amplifiers (SOAs) are very promising to be used as low-cost and high-performance optical devices for fibre-optic metropolitan and ...