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Experimental verification of edge guidance in a thin film waveguide.

In integrated optics, many optical circuits such as multiplexers, beam dividers, modulators, and directional couplers are required to process light signals in a planar structure. Curved waveguides are also important, and several papers have appeared that analyze wave propagation in a bent 2-D slab waveguide. When the waveguide bending radius becomes very small or the core width becomes large, it has been theoretically predicted that the energy of the guided mode concentrates near the outer edge of the waveguide and that mode properties are no longer affected by the inner edge of