Polymeric Integrated-Optic Bias Chip for Optical Voltage Transducers

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 polarize...

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Bibliographic Details
Published in:Journal of lightwave technology 2014-12, Vol.32 (24), p.4730-4733
Main Authors: Woo-Sung Chu, Sung-Wook Heo, Min-Cheol Oh
Format: Article
Language:English
Subjects:
Integrated optics
Optical device fabrication
Optical feedback
Optical polarization
Optical sensors
Optical waveguides
Polymers
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Description
Summary: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 3 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 pp , and the sensor exhibited linear response with a sensitivity of 9.4 mrad/kV.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2014.2366111