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
Original Manuscript: May 16, 1988
Published: September 1, 1989
Richard A. Soref and Brian R. Bennett, "Carrier refraction in quantum well waveguides," Appl. Opt. 28, 3577-3580 (1989)