Electroabsorption spectroscopy analysis of quantum-well modulator extinction and chirp

Electroabsorption (EA) spectroscopy measurement on a planar wafer is used to estimate the extinction and chirp characteristics of the compressively strained quantum-well (QW) EA modulator. Whereas the Stark shift dominates the behavior of 90-/spl Aring/ well/75-/spl Aring/ barrier QW, 75-/spl Aring/ well/50-/spl Aring/ barrier structure features absorption edge broadening, and the chirp parameter decreases nonlinearly with bias. The EA spectroscopy results are compared with the characteristics of the modulator in the EA modulated laser.