Ultracompact polarization converter with a dual subwavelength trench built in a silicon-on-insulator waveguide.

@article{Velasco2012UltracompactPC,
  title={Ultracompact polarization converter with a dual subwavelength trench built in a silicon-on-insulator waveguide.},
  author={Aitor V. Velasco and Maria Luisa Calvo and Pavel Cheben and Alejandro Ortega-Mo{\~n}ux and Jens H. Schmid and Carlos Alonso Ramos and I{\~n}igo Molina Fernandez and Jean Lapointe and M. Jake Vachon and Siegfried Janz and D. Xu},
  journal={Optics letters},
  year={2012},
  volume={37 3},
  pages={365-7}
}
The design and fabrication of an ultracompact silicon-on-insulator polarization converter is reported. The polarization conversion with an extinction ratio of 16 dB is achieved for a conversion length of only 10 μm. Polarization rotation is achieved by inducing a vertical asymmetry by forming in the waveguide core two subwavelength trenches of different depths. By taking advantage of the calibrated reactive ion etch lag, the two depths are implemented using a single mask and etching process… CONTINUE READING
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