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http://dx.doi.org/10.3807/KJOP.2019.30.6.249

Improvement of Thermal Stability of Optical Current Sensors Based on Polymeric Optical Integrated Circuits for Quadrature Phase Interferometry  

Chun, Kwon-Wook (Department of Electronics Engineering, Pusan National University)
Kim, Sung-Moon (Department of Electronics Engineering, Pusan National University)
Park, Tae-Hyun (Department of Electronics Engineering, Pusan National University)
Lee, Eun-Su (Department of Electronics Engineering, Pusan National University)
Oh, Min-Cheol (Department of Electronics Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.30, no.6, 2019 , pp. 249-254 More about this Journal
Abstract
An optical current sensor device that measures electric current by the principle of the Faraday effect was designed and fabricated. The polarization-rotated reflection interferometer and the quadrature phase interferometer were introduced so as to improve the operational stability. Complex structures containing diverse optical components were integrated in a polymeric optical integrated circuit and manufactured in a small size. This structure allows sensing operation without extra bias feedback control, and reduces the phase change due to environmental temperature changes and vibration. However, the Verdet constant, which determines the Faraday effect, still exhibits an inherent temperature dependence. In this work, we tried to eliminate the residual temperature dependence of the optical current sensor based on polarization-rotated reflection interferometry. By varying the length of the fiber-optic wave plate, which is one of the optical components of the interferometer, we could compensate for the temperature dependence of the Verdet constant. The proposed optical current sensor exhibited measurement errors maintained within 0.2% over a temperature range, from 25℃ to 85℃.
Keywords
Optical current sensor; Polymer waveguide; Photonic integrated circuit;
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