Abstract
We design an isotropic electric-field sensing system using an opticalprobe. The optical probe consists of three electric-field sensors basedon a Mach–Zehnder interferometer with the structure of segmentedelectrodes, which are perpendicular to each other. The measured resultsshow that the ±5 dB baseband can reach 3 GHz, the linear dynamicsrange is 70dB, and the minimum detectable electric field is lower than90 dBμV/m (the spectrum analyser resolution is 100 Hz). The directionalcharacteristics are almost isotropic within deviations of ±1.5 dB.Therefore this sensing system can be used in the electromagneticcompatibility measurements.
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