Characteristics of LiNbO_3 waveguide voltage sensor based on symmetrical metal-cladding optical waveguide
Yuan Wen, Sang Ming-huang, Xianfeng Chen, Pingping Xiao · Chinese Journal of Quantum Electronics · 2011
A new type of voltage sensor employing a symmetrical metal-cladding optical waveguide structure is proposed which utilized the sensitive property of ultrahigh-order modes of the metal-cladding optical waveguide.The voltage change can be determined by measuring the reflected light intensity when a direct voltage is applied to two electrodes to modulate the reflected light intensity through the refractive index change of LiNbO_3.The measurement range of voltage is from—800 V to 800 V with linearity of 0.995.The sensitivity coefficient of reflectivity light intensity is about 0.2%V~(-1).The results show that the voltage sensor has good linearity and high voltage sensitivity.And it has advantages of easy operating and cheap building up in measurement.