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

摘要

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