Micro-Structured Fiber as Temperature Sensor in a Loop Architecture

Abstract

A temperature sensor built by a micro-structured fiber (MSF) into a Sagnac interferometer scheme is reported. The optical waveguide is provided by a two-hole fiber (THF) which are located asymmetrically from the core. A linear response to thermal effects is observed and the sensitivity ∼ 2.22 nm/°C was reached using a 2m-long of THF. The main advantage of the system proposed is a linear response, the use of a MSF with a simpler transverse geometry, non-use a special filled mechanism for the holes and a simple experimental array.