Abstract

An ultrashort polarization beam splitter (PBS) based on an asymmetrical directional coupler is proposed by utilizing the evanescent coupling between a strip-nanowire and a nanoslot waveguide. In order to be convenient for integration with other components, mode converters between the nanoslot waveguide and the strip-nanowire are introduced and merged into S-bends to achieve an ultracompact PBS. As an example a $6.9\mathrm{\mu m}$ long PBS based on a silicon-on-insulator platform is designed, and the length of the coupling region is as small as $1.3\mathrm{\mu m}$. Numerical simulations show that the present PBS has a very broad band ($>160\mathrm{nm}$) for an extinction ratio of $>10\mathrm{dB}$.

© 2011 Optical Society of America

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