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10 May 2012 Grating couplers in thick rib SOI waveguides for TE and TM polarizations
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Grating couplers have shown promising performance in terms of coupling efficiency and alignment tolerances as an interface between optical fibers and nanometric silicon-on-insulator (SOI) waveguides. In this paper we review our previous work, where the implementation of a fiber to chip grating coupler in micrometric rib SOI waveguide was demonstrated for the first time, showing measured coupling efficiency of -2.2dB for transverse-electric (TE) polarization. We also propose a new grating design that achieves a calculated coupling efficiency of -2dB for transverse-magnetic (TM) light.
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C. Alonso-Ramos, A. Ortega-Moñux, R. Halir, L. Zavargo-Peche, I. Molina-Fernández, P. Cheben, D.-X. Xu, and S. Janz "Grating couplers in thick rib SOI waveguides for TE and TM polarizations", Proc. SPIE 8431, Silicon Photonics and Photonic Integrated Circuits III, 84310E (10 May 2012);

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