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A compact two-dimensional grating coupler used as a polarization splitter

2003; Institute of Electrical and Electronics Engineers; Volume: 15; Issue: 9 Linguagem: Inglês

10.1109/lpt.2003.816671

1941-0174

Dirk Taillaert, Harold M. H. Chong, P.I. Borel, Lars H. Frandsen, R.M. De La Rue, Roel Baets,

Optical Coatings and Gratings

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.