  We report on the demonstration of correlated photon pair generation in
quasi-phase-matched superlattice AlGaAs waveguides with a high
coincidence-to-accidental ratio (CAR); with a continuous (CW) pump, the
observed CAR (>100) is more than two order of magnitudes improvement over
previously reported spontaneous down conversion (SPDC) schemes in AlGaAs
waveguides with a pulsed pump.
