Abstract
An ultra-compact polarization splitter based on asymmetric metal/multi-insulator directional coupler is proposed and investigated analytically and numerically. A large modal birefringence of >;0.69 is estimated, enabling a clean polarization selective directional coupling within 5.6. The insertion loss of and the splitting and extinction ratios of <;-0.32 are predicted. Modified coupled-mode equations for a coupled lossy waveguide system are also presented.
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