Interferometric polarization-independent modulator in LiTaO/sub 3/
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Polarization-independent Mach-Zehnder modulators that utilize the off-diagonal r51 electrooptic coefficient have been produced in LiTaO3. The waveguides are formed by Zn vapor diffusion. Extinction values of 85% at 0.633-μm wavelength have been demonstrated for both TE and TM polarizations using a single control voltage and thermal tuning. The relatively large voltage-length product values (VL ≥ 15 V-cm) attained in these initial devices is 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. © 1990 IEEE
author list (cited authors)
Jung, H., Taylor, H. F., & Eknoyan, O.