Ultracompact polarization converter with a dual subwavelength trench built in a silicon-on-insulator waveguide Journal Articles uri icon

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  • 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. The measured converter loss is -0.7 dB and the 3 dB bandwidth is 26 nm.


  • Velasco, Aitor V
  • Calvo, María L
  • Cheben, Pavel
  • Ortega-Moñux, Alejandro
  • Schmid, Jens H
  • Ramos, Carlos Alonso
  • Fernandez, Íñigo Molina
  • Lapointe, Jean
  • Vachon, Martin
  • Janz, Siegfried
  • Xu, Dan-Xia

publication date

  • February 1, 2012