Ultrafast all-optical switching at 1.3 /spl mu/m/1.55 /spl mu/m using novel InGaAs-AlAsSb-InP coupled double quantum well structure for intersubband transitions

A coupled double quantum well (C-DQW) structure enabling ultrafast, multiwavelength, all-optical modulation using intersubband transitions is proposed. It has been demonstrated by calculating the absorption and relaxation characteristics that the InGaAs-AlAsSb C-DQW structure is desirable for application in all-optical switches for multiwavelength operation at near-infrared wavelengths down to 1.3 /spl mu/m. The capability of ultrafast all-optical switching/wavelength conversion between 1.3 and 1.55 /spl mu/m has also been demonstrated.