We demonstrate the use of multiple [(InAs) (GaAs)]/GaAs short-period s
trained-layer superlattice quantum wells for optical waveguide modulat
ion at 1.06 mum. We achieve pi phase modulation with 2.3 V applied (V(
pi) x L = 4.6 V mm, or 39-degrees/V mm) in the presence of negligible
absorption change using this all-binary modulator.