An optical module has a substrate, a waveguide, formed on the substrate, for guiding light, and a photonic crystal portion that has media having different refractive indices arranged in a periodic pattern and that is disposed in a channel of the waveguide on the substrate. The apparatus and method uses a vacuum conveying system wherein a sequence of suction forces is exerted from one or more suction apertures. 5 GHz to generate a constant amplitude frequency modulated optical wave Large group velocity dispersion is then applied with a chirped fiber Bragg grating to convert the FM signal to a pulse stream. These altered diffusion structures can reduce the peak IR drop value, such as by an amount in the range of 8%-30% of the original peak noise, to prevent the chip from malfunctioning due to the resultant noise.