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We accurately measured the electro-optic coefficient r33 of high-quality undoped stoichiometric LiNbO3 by use of the modulated Mach-Zehnder interferometric method. The obtained r33 value is nearly the same with that of congruent LiNbO3.
We demonstrated 80 Gb/s optical differential quadrature-shift-keying modulation, by using a single-chip integrated LiNbO3 modulator with two sub Mach-Zehnder interferometers, where 40 Gb/s in-phase and quadrature data were, simultaneously, fed to the modulator.
We demonstrated high extinction ratio intensity modulation for two-tone lightwave generation, by using an integrated Mach-Zehnder modulator with active trimmers which can compensate imbalance in the modulator due to fabrication errors. The extinction ratio was larger than 70 dB
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