The first AlGaAsSb/AlAsSb microactivity structure was grown by solid s
ource molecular beam epitaxy on an InP substrate. The reflectivity spe
ctrum shows a clear resonance at 1.55 mu m below a 0.997 reflectivity
plateau with a 190 nm wide stopband. A detailed analysis of this spect
rum suggests a growth rate stability of better than 1% over the 7.5 h
of growth. To investigate the quality of the structure the photolumine
scence spectrum was also obtained.