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A direct current voltage sensor based on all-fiber Mach- Zehnder interferometer is demonstrated, which utilizes electrostriction effect of Piezoelectric Translator. The character of voltage sensing is studies experimentally. Adopting the wavelength scale method, in the case of elimination of environmental perturbation, the wavelength changing range is 3.86nm when the voltage changes from -58v to 58v. The tuning sensitivity and the linear fitting are 0.033nm/v and 0.9985, respectively.
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