Phase Sensitive Parametric Interactions in a $Ga_{0.5}In_{0.5}P$ Photonic Crystal Waveguide

We report phase sensitive amplification in a 1.5mm long, Ga
_0.5
In
_0.5
P dispersion engineered photonic crystal waveguide which has a flattened dispersion profile. A signal degenerate configuration with pulsed pumps whose total peak power is only 0.5W yields a phase sensitive extinction ratio of 10dB.