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Improved coupled-mode theory for codirectionally and contradirectionally coupled waveguide arrays

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Abstract

A coupled-mode theory is derived from the scalar wave equation for the interaction between forward- and backward-traveling waves in a general slowly varying coupled waveguide array containing an arbitrary number of guides with a grating overlay. The equations include the effects of nonnegligible model overlap terms and changes in modal overlap but still demonstrate power conservation. Numerical results are presented for a contradirectional track-changing filter, which show that the modifications made to the equations are significant for practical devices.

© 1991 Optical Society of America

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