  The carrier lifetime of a photonic crystal all-optical switch is optimized by
controlling the surface of GaAs by Atomic Layer Deposition. We demonstrate an
all optical modulation capability up to 100GHz at Telecom wavelengths, with a
contrast as high as 7dB. Wavelength conversion has also been demonstrated at a
repetition rate of 2.5GHz with average pump power of about 0.5mW
