Abstract

Carrier-induced refractive index changes in forward-biased InGaAs–InAlAs quantum well waveguides are calculated using a Kramers-Kronig transformation of Bar-Joseph’s experimental absorption spectra [ Phys. Rev. Lett. 59, 1357 ( 1987)]. At the 1.65-μm wavelength where the material is nominally transparent, an index change of −0.06 is found for an injection of 6 × 10¹⁷ electrons/cm³. A quantum well waveguide 2 × 2 reversed-Δβ directional coupler switch with an active length of 480 μm is proposed.

© 1989 Optical Society of America

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