Coupling of guided light through a periodic multilayer

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Abstract
The structure of a coupler using a periodic multilayer between two waveguides is studied from the aspect of fabrication technology. The coupling is expected to be by Bragg instead of conventional evanescent waves. Because of the successful use of the peculiar nature of the Bragg waves, there is a chance of relaxing the fabrication tolerance. As a result, it is possible to make the coupler with standard design considerations and techniques that are not available for the fabrication of conventional evanescent wave couplers.