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Optical and electrical characteristics of AlGaAs lasers with separateconfinement heterostructures are modeled by using Synopsys's Sentaurus TCAD,and open source software. The results for cases of 2-QW (2 Quantum Wells) and3-QW structures are compared with these for 1-QW. A significant improvement ofuseful laser parameters is obtained by increasing the number of Quantum Wellsand optimizing the width of waveguides. In particular, the maximum opticalefficiency is shown to reach 88% for a 3-QW structure with optimal width ofwaveguides. The width of optical intensity profile of MQW lasers increases,leading to lowering maximal light power density passing through laser facets,decreasing the risk of catastrophic damage of mirrors.

The effects of multiply quantum wells (MQW) on optical and electrical  characteristics of AlGaAs lasers with separate confinement heterostructures  (SCH)