A novel configuration for a wide‐range high‐power fiber‐optic current sensor

Abstract

Abstract In this paper it is discussed a new configuration for a fiber‐optic current sensor (FOCS) which increases the linearity range of the device without decreasing its sensitivity exploiting an appropriate feedback loop; in this way the whole system behaves as a “null‐detector”. Moreover, the effect of bending‐induced linear birefringence is explicitly taken into account in the design and optimization of the sensor. It is shown that the response of the experimental apparatus is practically temperature independent and that its bandwidth gets values higher than I MHz.