FIBER SAGNAC INTERFEROMETER TEMPERATURE SENSOR

A modified Sagnac interferometer-based fiber temperature sensor is pro posed. Polarization-independent operation and high temperature sensiti vity of this class of sensors make them-cost effective instruments for temperature measurements. A comparison of the proposed sensor with Br agg grating and long-period grating fiber sensors is derived. A temper ature-induced spectral displacement of 0.99 nm/K is demonstrated for a n internal stress birefringent fiber-based Sagnac interferometer. (C) 1997 American Institute of Physics.