Abstract
We propose a novel design of integrated polarization splitter/combiner
with ultra wide bandwidth. The proposed design utilizes the electro-optic
(Pockels) effect in GaAs for splitting the polarizations. It also exploits
the self imaging phenomenon in MMI couplers with a parabolic index
distribution in the vertical direction to significantly increase the
bandwidth. We also propose a novel approach for design optimization of the
proposed structure. This approach is capable of extracting the propagation
constants and their gradient with respect to all the design parameters. This
allows for using gradient-based optimization. The computational time of this
optimization procedure is only a fraction of that for other recently
proposed approaches.
© 2010 IEEE
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