The effect of the nature of nitrogen incorporation in the InGaAsN/GaAs quan
tum well system on gain is investigated. The nitrogen is considered to be e
ither fully incorporated within the lattice or to be incorporated as a loca
lized acceptor. In the latter case this results in conduction-band anticros
sing, causing nonparabolicity. The resulting gains from the two extreme lim
its are compared and found to be similar. This shows that the nature of the
nitrogen incorporation is not a key issue in the performance of InGaAsN/Ga
As quantum well lasers for 1.3 mum applications. (C) 2001 American Institut
e of Physics.