Distributed strain and temperature sensing over 100 km using tunable-wavelength OTDR based on MEMS filters

摘要

The possibility of distributed wide-range strain and temperature measurements in a 100kmlong optical fiber using tunable-wavelength low-coherence optical time-domain reflectometer (OTDR) is demonstrated. The specified distance range is provided by employing two narrowband microelectromechanical system (MEMS) spectral filters tuned synchronously aswell as by taking advantage ofRaman amplification and amplification by remotely pumped erbium-doped fiber segments built into the fiber under test. With the time of a single measurement of 10 min and the spatial resolution of about 1 m, the measurement range reached 1000 mu epsilon in strain units, which is equivalent to the temperature range of 110 degrees C. (C) 2021 Optical Society of America