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Presents information on a study which demonstrated asymmetric Fabry-Perot reflection modulators using both indium gallium arsenide and gallium arsenide quantum wells which operate beyond the matching condition and exhibit zero phase change when switched. Methods; Results; Discussion.

Deals with a study which analyzed coupled InGaAs quantum-well systems which use filed-induced spatial separation of electron and hole states to modulate the magnitude of exciton optical absorption. Composition of the samples; Function of the effective exciton radius; Benefits from the use of the InGaAs compound.

Investigates three-step asymmetric coupled quantum wells to obtain a higher-degree of negative differential absorption modulation than is obtainable through the quantum-confined Stark effect. Reason for the field-induced enhancement and suppression of electron; Stress-related effects on the electron-light hole; Overview of the Kramers-Kronig relations.