<title>Magnet-sensitive optical fiber and its application in current sensor system</title>

Abstract

Terbium-doped optical fiber has high Verdet constant and is called magnetsensitive fiber. It is of importance for a variety of applications including magnetic field sensor, current sensor, and fiber-type isolator. In this paper, we describe magnet-sensitive optical fiber fabrication, magnetooptic coefficient measurement, and its application in current sensor system. Experimental results show that the Verdet constant of magnet-sensitive fiber containing high rare-earth content (-4000 parts in lOs) is 2.7 times as high as that of ordinary silica based fiber. When tested in current sensor system, it gives similar performance observed in ultralow birefringent fiber. These results are new and have not been published before.