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

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6 Author(s)
Taillaert, D. ; Dept. of Inf. Technol., Ghent Univ.IMEC, Gent, Belgium ; Harold Chong ; Borel, P.I. ; Frandsen, L.H.
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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.

Published in:

Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 9 )