Real-time phase-recording DAS in 171 km low-loss fiber

• DOI: 10.1364/ofs.2020.t2a.3
• Publication Date: 2021-11-05T14:07:12Z
• Authors: Ole Henrik Waagaard; Erlend Rønnekleiv; Aksel Haukanes; Frantz Stabo-Eeg; Dag Thingbø; Stig Forbord; Svein Erik Aasen; Jan Kristoffer Br...

We demonstrate sustained real-time phase-recording distributed acoustic sensing (DAS) in 148 km standard SMF28e and 171 low-loss OFS TeraWave SCUBA 125 fibers without inline amplification. Low noise high optical dynamic range are obtained by combining swept frequency interrogation a very low phase laser.