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Polarization-independent LiTaO3 guided-wave electrooptic switches

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3 Author(s)
Yoon, D.W. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Eknoyan, O. ; Taylor, H.F.

Polarization-independent LiTaO3 optical switches that utilize the off-diagonal electrooptic coefficient r51 are discussed. The waveguides are formed by Zn vapor diffusion. Interguide transfer efficiencies of 84 and 88% for TM and TE polarizations, respectively, have been obtained. Modulation efficiency of 99.8% for TM and 95% for TE have been demonstrated at nearly equal voltages by thermally tuning to 20°C. The relatively high voltage-length product (30-35 V-cm) attained in these initial devices at a 0.633-μm wavelength is attributed to a weak overlap between optical and electrical fields in the periodic electrode structure

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Lightwave Technology, Journal of  (Volume:8 ,  Issue: 2 )