Abstract

An ultra-compact and broadband polarization rotator is proposed and realized on the Silicon-On-Insulator platform. The polarization rotation (TM₀-TE₁) is achieved by utilizing a straight multi-mode waveguide. Then, a bent multi-mode waveguide is used to obtain the TE₁-TE₀ mode conversion process. Finally, a bent coupler is utilized to filter out the residual TM₀ mode. The measured extinction ratio at the central wavelength is 32.5 dB. The −20 dB bandwidth is measured to be 90 nm.

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