Defect-free modulator at 1.06 mu m using a strain-balanced multiquantum well

Recently, the authors reported defect-free, InGaAs-GaAsP multiquantum well modulators operating at 1015 nm, but with an unusual dual-peak spectra that resulted in slight degradation in performance. Now they report a similar sample grown under reactor gas overpressure that has normal spectra. The dual-peak spectra are therefore attributed to microscopic domain formation that the gas overpressure inhibits by reducing surface atom mobility. The operation has also been extended to 1.06 mu m, the Nd:YAG wavelength.