Abstract

Using an array of m×n nonlinear ring resonators (m=1, 3, 5, and n=1, 2, 3) coupled to the upper arm of a Mach–Zehnder interferometer (MZI), we have proposed an all-optical switch structure. Using a 5×3 array, we have shown the possibility of designing an all-optical switching device with a threshold intensity as low as 15mW/m2 and switching window of 35ps. While using m×1 arrays, we have achieved switching windows smaller than 10ps, at the expense of higher switching thresholds, ranging from 37 to 55mW/m2. The whole structure is based on a square lattice photonic crystal of lattice constant a=600nm, formed by rods of radius r=90nm in an air background. The linear rods’ refractive index is taken to be the same as that of Si0.75Ge0.25; i.e., nr=3.6, whereas the nonlinear rod’s refractive index and Kerr index parameter are taken to be n0=1.4 and n2=1014m2/W. The center wavelength at which the nonlinear rings are designed to make the resonance is taken to be λ0=1550nm in free space.

© 2008 Optical Society of America

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