N-TYPE DELTA-DOPED STRAINED-QUANTUM-WELL LASERS FOR IMPROVED MODULATION BANDWIDTH

Improved dynamic properties of strained single quantum well (QW) laser s were obtained by the incorporation of an n-type delta doping at clos e proximity to the strained QW active layer. The resultant modulation bandwidth was almost doubled, from 3.5 GHz to more than 6.2 GHz. The i ncreased modulation bandwidth is attributed to an improved carrier inj ection resulting from the enhancement of the carrier transit time into the QW, as well as a decrease in the significance of the adverse cont ribution of carrier transport effects. (C) 1997 American Institute of Physics.