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Abstract. The design and fabrication of an integrated waveguide polarizer in z-cut LiNbO 3 crystals are reported. Singlepolarization guiding is achieved by careful selection of Ti diffusion parameters exploiting the transverse electric/ transverse magnetic ͑TE/TM͒ refractive index anisotropy. Fabricated Ti: LiNbO 3 waveguide polarizers of 1.5 cm length exhibit less than 0.2-dB/ cm propagation loss at TM and 33-dB extinction ratio as measured at 1.55-m wavelength.

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