Beyond 21 km Distributed Strain Measurement with Brillouin Optical Correlation Domain Reflectometry Using Polarization Diversity Method and Temporal Gating Scheme

Abstract

We develop a Brillouin optical correlation domain reflectometry (BOCDR) system using polarization diversity method and temporal gating scheme. Polarization diversity method is used for detecting backscattered light with rotated polarization from single mode fiber (SMF), and temporal gating scheme is used for expanding the measurement range. A section with 3 m length and 6000 µε strain was experimentally measured at a distance of 21 km SMF with 20 cm nominal spatial resolution. Our result shows the figure of merit N_R, which is a ratio between the measurement range and the spatial resolution, reaches to 105965.