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Opt Express. 2008 Feb 18;16(4):2628-35.

Polarization rotator based on silicon wire waveguides.

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NTT Microsystem Integration Laboratories, 3-1, Morinosato-Wakamiya, Atsugi-Shi, Kanagawa, Japan.


We describe a polarization rotator based on an off-axis double-core structure consisting of a silicon wire waveguide and a silicon-oxinitride waveguide. The rotator can be made by planar fabrication technology and do not require complex processes, such as three-dimensional structure formation. A rotator with 35-microm long provides the polarization rotation angle of 72 degrees and the polarization extinction ratio of 11 dB with the excess loss of about 1 dB. Our polarization rotator represents a significant step towards accomplishing an optical circuit with polarization diversity based on silicon wire waveguides.


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