Abstract
The operating bias point of optical voltage transducers (OVTs) must be adjusted to a quadrature phase point through the compensation of residual birefringence induced by the optical fiber and sensor head. An integrated optical device consisting of a polymeric waveguide 3-dB coupler, TE-pass polarizer, thermo-optic phase modulator, and polarization converter was proposed for adjusting the operating bias point. A high-voltage sensor probe was prepared with a LiTaO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> electro-optic crystal sandwiched by Teflon spacers. The operating point control was confirmed by measuring the output polarization change on the Poincaré sphere. Preliminary OVT experiment was performed by applying a high-voltage signal of 60 Hz, 4 kV <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">pp</sub> , and the sensor exhibited linear response with a sensitivity of 9.4 mrad/kV.
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