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Opt Lett. 2012 Feb 1;37(3):365-7. doi: 10.1364/OL.37.000365.

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

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Departamento de Optica, Facultad de Ciencias Fisicas, Universidad Complutense de Madrid, Madrid, Spain.


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.

[Indexed for MEDLINE]

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