Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (?-OTDR)

Abstract Phase-sensitive optical time domain reflectometry (?-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed (DAS) based on the ?-OTDR phase demodulation has been extensively studied widely used intrusion detection, borehole seismic acquisition, structure health monitoring, etc., recent years, superior advantages such as long range, fast response speed, wide bandwidth, low operation cost service lifetime. Significant advances research development (R&D) of have made since 2014. this review, we present a historical review then summarize progress Fiber Optics Research Center (FORC) at University Electronic Science Technology China (UESTC), which first group carry out R&D invent ultra-sensitive DAS (uDAS) seismometer elected one ten most significant technology PetroChina 2019. It can be seen that ?-OTDR/DAS currently under its rapid stage would reach climax next 5 years.