Development of optical voltage transducer based on dual-mode highly elliptical-core polarization maintenance fiber

This paper describes an optical voltage transducer (OVT) for the 35 kV electric power system based on modular interference in dual-mode highly elliptical-core polarization maintenance fiber (E-core PMF). And the temperature and environmental perturbation can be compensated automatically. In the scheme, a quartz crystal cylinder wrapped with highly elliptical-core fiber plays the role of voltage sensor head. The two interference output lobes' intensity from the E-core PMF is modulated with the converse piezoelectric effect of quartz crystal. A PZT wrapped with E-core PMF at ground potential serves as the static modular phase difference control and temperature compensation unit. And the experiment results indicate that the OVT designed in this paper has satisfying performance and could successfully rejects the temperature perturbation.