A novel compensation fiber coil for eliminating Sagnac Effect in fiber optic current sensor

In Sagnac interferometer fiber optics current sensor, errors from the residual linear birefringence and environmental temperature and vibration sensitity has severely influenced on accuracy of this sensor. Spun highly linearly birefringent fiber has intrinsic sensitivity to magnetic fields through the Faraday Effect which result in simplification of optical element. The absence of the quarter wave plate result in good temperature performance and reducing light loss for less splice points. In this manuscript, the spun highly linearly birefringent fiber was designed and the vibration insensitive Sagnac interferometer fiber optics current sensor (S-FOCS) scheme was set up. In this scheme, the compensation fiber coil was designed to compensate the error caused by Sagnac effect in sensing fiber coil. Therefore, it is vibration immunity Sagnac interferometer fiber optics current sensor. The theoretical modeling of the state of light polarization was built by Jones Matrix. The results demonstrated that this novel sensor have good performance of conductor position insensitivity, temperature stability and vibration immunity.