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Zn indiffusion waveguide polarizer on a Y-cut LiNbO3 at 1.32-μm wavelength

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3 Author(s)
Ruey-Ching Twu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Chia-Chih Huang ; Way-Seen Wang

A polarization-dependent loss measurement of Zn indiffusion (ZI) waveguide on a Y-cut LiNbO3 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 1.32-μm wavelength is 0.9 dB/cm and the best measured polarization extinction ratio is 44 dB at a 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.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 2 )