Journal
OPTICS LETTERS
Volume 38, Issue 1, Pages 4-6Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.000004
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Funding
- NSFC [61077040]
- 863 project [2011AA010301]
- Zhejiang provincial grant of China [Z201121938]
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An ultra-short (similar to 10 mu m long) polarization beam splitter (PBS) based on an asymmetrical bent directional coupler (DC) is demonstrated experimentally by using silicon-on-insulator nanowires. The bent DC is designed to cross-couple TM polarized light completely while there is almost no coupling for TE polarization. Grating couplers are introduced at both ends of the PBS for efficient coupling to single-mode fibers. The measurement results show that the extinction ratios of the fabricated ultra-short PBS are higher than 10 dB for both polarizations in a broad wavelength range. It is also shown that the present PBS has a large fabrication tolerance. (C) 2012 Optical Society of America
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