Abstract

We calculate to first order the coupling coefficient between a pair of nonidentical (unequal widths and/or refractive indices) intersecting waveguides (see Fig. 1). This approach is similar to the method used in Refs. 1 and 2. From this first-order coupling coefficient, a simple graphical representation together with a set of parametric curves are derived. These tools allow us to design zero-cross-talk optical crossovers for both the case of a single wavelength and two wavelengths.

© 1991 Optical Society of America