Measurement of Poisson's Ratio of Optical Fibers and its Temperature Dependence Using Forward-Stimulated Brillouin Scattering (CAT#: STEM-ST-0157-YJL)

Introduction

Optical fiber technology based on silica glass is a well stablished technology. However, an accurate determination of Poisson's ratio (𝜈) is still required. It is somewhat surprising the limited knowledge that is available on optical fiber Poisson's ratio. Most reported values were measured for bulk silica, but a significant difference is usually observed with the experimental values obtained for silica optical fibers. A value ranging between 0.16 and 0.17 is assumed, with an uncertainty of ± 0.01, i.e., a relative error of 6%. Two lines of research can benefit from an accurate knowledge of Poisson's ratio and its dependence with temperature (d𝜈/d𝑇): the study of photoelastic effects in optical fibers (i.e., the determination of Pockels coefficients), and the development of fiber sensors.