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We estimate the phase velocity of a modulation microwave in a quasi-velocity-matched (QVM) electro-optic (EO) phase modulator (QVM-EOM) using EO sampling which is accurate and the most reliable technique for measuring voltage waveforms at an electrode. The substrate of the measured QVM-EOM is a stoichiometric periodically domain-inverted LiTaO3 crystal. The electric field of a standing wave in a resonant microstrip line (width: 0.5Ã¢Â€Â‰mm, height: 0.5Ã¢Â€Â‰mm) is measured by employing a CdTe crystal as an EO sensor. The wavelength of the traveling microwave at 16.0801Ã¢Â€Â‰GHz is determined as 3.33Ã¢Â€Â‰mm by fitting the theoretical curve to the measured electric field distribution. The phase velocity is estimated as  vm=5.35ÃƒÂ—107Ã¢Â€Â‰m/s,  though there exists about 5% systematic error due to the perturbation by the EO sensor. Relative dielectric constant of ÃŽÂµr=41.5 is led as the maximum likelihood value that derives the estimated phase velocity

advances in optoelectronics

Phase Velocity Estimation of a Microstrip Line in a Stoichiometric Periodically Domain-Inverted <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>LiTaO</mml:mtext></mml:mrow><mml:mtext>3</mml:mtext></mml:msub></mml:mrow></mml:math> Modulator Using Electro-Optic Sampling Technique

Phase Velocity Estimation of a Microstrip Line in a Stoichiometric Periodically Domain-Inverted LiTaO3 Modulator Using Electro-Optic Sampling Technique