Optical Voltage Sensors Based on Integrated Optical Polarization-Rotated Reflection Interferometry

• Published in: Journal of lightwave technology Vol. 34; no. 9; pp. 2170 - 2174
• Main Authors: Chu, Woo-Sung, Kim, Sung-Moon, Wu, Xiaoping, Wen, Liu, Oh, Min-Cheol
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Assembling; Crystals; Electric fields; Electric potential; Integrated optics; Interferometry; Optical fiber sensors; Optical fibers; Optical interferometry; Optical polarization; Optical sensing and sensors; Polarization; Polymer waveguides; Reflection; Sensors; Voltage; (280.4788) optical sensing and sensors; (250.5460) polymer waveguides; (230.3120) Integrated optics
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2016.2527685

Optical voltage sensors based on reflection interferometry of two orthogonal polarizations have been demonstrated by using a polymeric integrated optic device, in which a thermooptic phase modulator, a polarization converter, and a polarizer are integrated on a single chip. The sensing probe for electric field measurement was prepared by assembling an LiTaO 3 electrooptic crystal along with a polarization maintaining collimator, a Faraday rotator, and a dielectric mirror. Spectral bandwidth of the light source was optimized to be 16.5 nm in order to provide low noise and good extinction ratio in the reflection interferometry. For an applied voltage of 60 Hz, 4 kV pp , the sensor exhibited linear response with a phase retardation sensitivity of 0.5°/kV.