Patent ID: 6597011
Filing Date: 2003-07-22
Classification: B82Y,G02F,H01L

Abstract:
An electrical four-port and optical two-port device including;a structure having an unstrained or strained semiconductor quantum well region comprising the active region; a means for the simultaneous application of non-parallel fields to the said quantum well structure; a means for providing photogenerated electron and hole blocking-layers disposed either side of the said active region as a means to confine both electron and hole carrier transport solely within a vector mostly parallel to the plane of the quantum well layers, thereby inhibiting transport of carriers along the growth direction of the quantum well; a means for generating an electric field mostly perpendicular to the layers of the quantum well structure using a single dopant species (namely n-type); a means for providing electrical contact to and being capable of generating an electric field mostly parallel to the plane of the layers of the active region; a means of coupling input optical power from an optical source into the said active region; a means of coupling out the modulated optical power from the said active region; and a means for modulating the active region absorption using the quantum confined Stark effect.