Influence of coupling effect in the operation of vertically coupled quantum-dot lasers

Abstract

The influence of the coupling effect in the operation of vertically coupled quantum-dot lasers is studied by solving coupled rate equations including the terms representing carrier coupling between vertically stacked quantum dots. The calculation results show a much narrower spectral width above the lasing threshold compared with the uncoupled case. The single-mode output power is also enhanced by the coupling effect, especially when there is a large fluctuation in dot size.