Carrier refraction in quantum well waveguides.
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 l.65-,microm wavelength where the material is nominally transparent, an index change of -0.06 is found for an injection of 6 x 10(17) electrons/cm(3) . A quantum well waveguide 2 x 2 reversed-Deltabeta directional coupler switch with an active length of 480 microm is proposed.
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