A Wannier-Stark waveguide electroabsorption modulator as a low-power switch and its application as NAND, NOR or EXOR all-optical logic gates

A resistor-biased self-electro-optic-effect device in waveguide geometry ha s been realized with an electroabsorption modulator containing an InGaAs/In P superlattice as the waveguide core. Room-temperature all-optical switchin g has been experimentally observed over a wide wavelength range between 1.5 1 and 1.58 mum. Simulation of the device response to time-varying digital optical input sig nals shows that it is possible to obtain optical logic operation using thes e devices. Boolean functions such as NAND and NOR can be realized at 1.55 m um and EXOR operation at 1.51 mum at fairly low optical power levels. The f unctionality is however rather sensitive to optical bias power variations.