We study cross-slot waveguides for polarization diversity schemes that simultaneously offer strong confinement in the slot region for both TE and TM polarizations. A symmetric configuration is initially presented to demonstrate that the same strong confinement and propagation constants can be obtained for both polarizations and slot thicknesses down to . To make easier further realization of these waveguides, an asymmetric waveguide configuration with a vertical slot height of up to is proposed. The waveguide parameters are then optimized taking into account a silicon thickness. Our simulation results show that no beating issues between TE and TM modes is observed for beating lengths under , thus opening the way to efficient implementations of polarization diversity approaches.
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