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The influence of quantum dot (QD) density, uniformity and layer number on the 3 dB bandwidth of 1.3 mum InAs-InGaAs QD VCSELs is investigated by the small signal analysis of all-pathway rate equations. The dependence of bandwidth on the QD density is shown. Linearly dependence of bandwidth on the QD uniformity is demonstrated. High speed operation (> 10 GHz) of QD VCSEL emitting at 1.3 mum is predicated.
Electroabsorption properties of 1.3mum InAs/InGaAs/GaAs quantum dot electroabsorption modulator (EAM) are investigated. Onset of absorption to higher electric field suggests the potential to achieve higher optical power handling capability than conventional EAM.
InAs(N)/GaAs quantum dots were studied by x-ray diffraction, photoluminescence (PL) spectra, and atom force microscopy. Complicated blue shift in the PL peak energy with increasing nitrogen concentration was observed. This shift arises from the quantum size effect in the quantum dots, which dominates the nitrogen induced reductions of the InAsN band gap.
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