Journal
OPTICS LETTERS
Volume 36, Issue 13, Pages 2590-2592Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.002590
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- Defense Advanced Research Projects Agency Microsystems Technology Office (DARPA MTO) under the Centers in Integrated Photonics Engineering Research (CIPhER) [HR0011-10-1-0079]
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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 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 mu m. Numerical simulations show that the present PBS has a very broad band (>160 nm) for an extinction ratio of >10 dB. (C) 2011 Optical Society of America
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