Polarization-independent grating coupler for micrometric silicon rib waveguides.

  title={Polarization-independent grating coupler for micrometric silicon rib waveguides.},
  author={Carlos A Alonso-Ramos and L. Zavargo-Peche and Alejandro Ortega-Mo{\~n}ux and Robert Halir and I{\~n}igo Molina-Fern{\'a}ndez and Pavel Cheben},
  journal={Optics letters},
  volume={37 17},
Grating couplers are a promising approach to implement efficient fiber-chip coupling. However, their strong polarization dependence makes dual-polarization operation challenging. In this Letter we propose, for the first time, a polarization-independent grating coupler for thick rib silicon-on-insulator (SOI) waveguides. Coupling efficiency is optimized by designing the grating pitch and duty cycle, without varying the bottom oxide thickness, which significantly simplifies practical… CONTINUE READING

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