Electroabsorption in GaAs/AlGaAs coupled quantum well waveguides

Islam, M. N.; Hillman, R. L.; Miller, D. A. B.; Chemla, D. S.; Gossard, A. C.; English, J. H.
April 1987
Applied Physics Letters;4/20/1987, Vol. 50 Issue 16, p1098
Academic Journal
A novel GaAs/AlGaAs coupled quantum well structure, consisting of two 46 Ã… wells separated by a 11.5 Ã… barrier, was embedded in a leaky waveguide. Polarization anisotropy and quantum-confined Stark effect absorption changes are observed, and a 14:1 modulator is demonstrated operating at the peak of the first light-hole transition. Although the lowest energy transitions behave as predicted by tunneling resonance calculations, higher energy states exhibit unusual behavior due to valence-band mixing.


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