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Practical directional couplers have nonparallel waveguide regions where significant power transfer occurs. Such power transfer is generally calculated by numerical integration 1. We report on a simplified method using a multiplicative factor which depends on the generic waveguide path. Use of this method allows rapid determination of the power transfer in nonparallel waveguide regions, which facilitates directional coupler design.
© 1988 Optical Society of America
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