Optical microfibers for fast current sensing

The rise of optical microfiber technology has opened up a new era of optical sensing. Their unique optical and mechanical qualities have attracted a great deal of attention, and rapid advances have been made in light of the early experiments. Amongst them, current sensors based on the Faraday Effect in optical microfibers have shown their potential for ultra-fast current detection in ultra-small geometry. Significant progress has been made since the first demonstration, and it is the aim of this paper to provide an overview on the latest developments in this exciting area of optical sensing.