We demonstrate a novel polarization splitter based on a two-dimensional grating etched in a silicon-on-insulator waveguide. The device couples orthogonal modes from a single-mode optical fiber into identical modes of two planar ridge waveguides. The extinction ratio is better than 18 dB in the wavelength range of 1530-1560 nm and the coupling efficiency is approximately 20%. The device is very compact and couples light only to transverse-electric modes of the planar waveguides. Therefore, it may be used in a polarization diversity configuration to implement a polarization insensitive photonic integrated circuit based on photonic crystal waveguides.
CITATION STYLE
Taillaert, D., Chong, H., Borel, P. I., Frandsen, L. H., De La Rue, R. M., & Baets, R. (2003). A compact two-dimensional grating coupler used as a polarization splitter. IEEE Photonics Technology Letters, 15(9), 1249–1251. https://doi.org/10.1109/LPT.2003.816671
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