A deep domain inversion (DI) technique for X-cut LiNbO3 is reported. DI regions as deep as 70 μm, i.e., deep enough for virtually any guided-wave application, were obtained by electric-field poling, with even deeper DI regions possible. As an application of the DI technique, a bandpass traveling-wave Mach–Zehnder modulator is demonstrated with a 15 GHz bandwidth centered at 21 GHz.
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Kishino et al. (2000) studied this question.
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