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Opt Express. 2009 Nov 9;17(23):20694-9. doi: 10.1364/OE.17.020694.

Higher-order-mode assisted silicon-on-insulator 90 degree polarization rotator.

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1
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA. yyue@usc.edu

Abstract

We propose and analyze a 90 degrees polarization rotator based on wave coupling through an intermediate, multimode, axially uniform waveguide. The coupling efficiency of the x- and y-polarized fundamental modes between the horizontal and vertical rectangular waveguides is remarkably enhanced with the help of the TE(01) mode in the multimode waveguide. The polarization rotator has a very short (21-microm) conversion length with a 17.22 dB extinction ratio. It also exhibits a 68-nm bandwidth for polarization conversion efficiency above 90%.

PMID:
19997299
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