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Optical waveguide structure for an all-optical switch based on intersubband transitions in In Ga As Al As Sb quantum wells

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Abstract

A vertical slab waveguide design for an all-optical switch based on intersubband transitions in molecular beam epitaxy (MBE)-grown coupled double InGaAsAlAsSb quantum well (QW) structures is presented. We propose a waveguide with two surrounding high refractive index InGaAsP guiding layers, which confine the optical mode in the low refractive index QW region and thus enable light guiding with low contrast InP cladding layers. We investigate the proposed concept by means of 1D simulations of several waveguide configurations. We confirm its validity by fabricating deeply etched waveguiding structures using either wet- or dry-etching technologies. Optical losses as low as 13.5dBcm1 and 12.8dBcm1 were measured for TM- and TE-polarized light, respectively.

© 2007 Optical Society of America

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