Abstract

A new type of directional coupler for integrated optics is presented here which looks like the ordinary strip waveguide type of directional coupler but which operates on a different coupling mechanism. As shown in Fig. 1, the coupler consists of two strip waveguides placed on a thin film on a substrate, where the two strips couple to each other over a given length. However, its operation allows a greater separation between the two strips than is present in the customary coupler.

© 1978 Optical Society of America