We report the observation of second-harmonic generation by type I quasi phase matching in a GaAs–AlAs superlattice waveguide. Quasi phase matching was achieved through modulation of the nonlinear coefficient , which we realized by periodically tuning the superlattice bandgap. Second-harmonic generation was demonstrated for fundamental wavelengths from 1480 to 1520 nm, from the third-order gratings with periods from 10.5 to . The second-harmonic signal spectra demonstrated narrowing owing to the finite bandwidth of the quasi-phase-matching grating. An average power of was obtained for the second harmonic by use of an average launched pump power of .
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