Abstract

Results of a rigorous leaky wave analysis of an optical grating coupler having a large grating period are presented. The coupler is designed so that most of the guided-wave power is transferred to a substrate beam progressing in the forward direction with the first-order air beam made evanescent. It is found that a large power partition into the substrate beam can readily be obtained in spite of the presence of a number of higher-order propagating space harmonics. Validity of the approximate perturbation method for the case of the long grating period is also examined.

© 1989 Optical Society of America

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