A polarization-dependent loss measurement of Zn indiffusion (ZI) waveguide on a -cut LiNbO 3 substrate is firstly reported. The measured results show that the waveguides support either a single extraordinary polarization or both extraordinary and ordinary polarizations depending on the fabrication process parameters. For the single extraordinary polarization waveguide, the measured propagation loss at 1.32m wavelength is 0.9 dB/cm and the best measured polarization extinction ratio is 44 dB at

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... distance of 1.5 cm from the input end, which are quite good for being a waveguide polarizer. Moreover, the voltage-length product measured for the ZI Mach-Zehnder modulator shows that the substrate electrooptic coefficient is not degraded. Index Terms-Lithium niobate, polarization-dependent loss measurement, polarizer, Zn indiffusion.