Comment on “Theory and Experiment of ${\hbox{In}}_{1-{x}}{\hbox {Ga}}_{x}{\hbox {As}}_{y}{\hbox{P}}_{1-{y}}$ and ${\hbox{In}}_{1-{x}-{y}}{\hbox {Ga}}_{x}{\hbox {Al}}_{y}{\hbox {As}}$ Long-Wavelength-Strained Quantum-Well Lasers”

Minch [IEEE J. Quantum Electron., vol. 35, no. 5, pp. 771-782, May 1999] compared the theoretical conduction band offset ratio of In
_1-x-y
Ga
_x
Al
_y
As/InP heterostructure calculated from Harrison's model and model-solid theory to the empirical results obtained from experimental measurement. We wish to point out that the comparison was not appropriate as the calculated results were the band offset ratio, whereas the reference empirical result was the band offset energy. The corrected comparison graph is presented in this comments.