Wavelength demultiplexing optical switch

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Abstract
A novel wavelength demultiplexing optical switch (WDMOS) with completely optical input/output capabilities is demonstrated. The WDMOS input elements can be applied to optical logic circuits in which discrete wavelengths are utilized as an added dimension to the intensity levels of the optical signals. The WDMOS can be viewed as a resonant cavity‐enhanced heterojunction phototransistor vertically integrated with a quantum well light emitting diode. The resulting device is an N‐p‐n‐p optical switch situated in an optical cavity which serves to combine the wavelength selective spectral response of the optical cavity with the bistable switching characteristics of the N‐p‐n‐p structure.