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Interferometric polarization-independent modulator in LiTaO3

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

Polarization-independent Mach-Zehnder modulators that utilize the off-diagonal r51 electrooptic coefficient are produced in LiTaO3. The waveguides are formed by Zn vapor diffusion. Extinction values of 85% at 0.633-μm wavelength are demonstrated for both transverse electric and transverse magnetic polarization using a single control voltage and thermal tuning. The relatively large voltage-length product values (VL⩾15 V-cm) attained in these devices are attributed to a weak overlap between optical and electrical field profiles. Electrode alignment and dielectric loading are critical factors for the optimization of device operation

Published in:

Lightwave Technology, Journal of  (Volume:8 ,  Issue: 10 )

Date of Publication:

Oct 1990

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