Variational analysis of directional couplers with graded index profile

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Abstract

A variational analysis of graded optical directional couplers is presented. Fabrication of such directional couplers by an electron-beam writing method has recently been reported. We have shown that our analysis gives better results than the WKB method which has been used previously to analyse such couplers. Further, our analysis involves much less algebraic and numerical work than the WKB method.

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Work partially supported by Department of Science and Technology, India and Counsil of Scientific and Industrial Research, India.

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