On the differential gain in coupled quantum wells

The combined self-consistent and well-coupling effects on differential gain in a double quantum well system were analyzed. The analysis was performed for a 1.55 νm InGaAsP/InP lattice-matched system grown in the [001] direction. A 4×4 Luttinger-Kohn (LK) model for the heavy and light holes was used for final gain calculations. The results show that an increase of the density of conduction electrons and the reduction of hole densities modifies the amplitude of the differential gain and the change in relative transition strengths which modifies the spectral dependence.