Range-scalable distributed acoustic sensing with EDFA repeaters demonstrated over 2227 km

We demonstrate a new, to the best of our knowledge, range-scalable repeatered distributed acoustic sensing (DAS) solution sharing technology with existing long-haul subsea telecom networks capable of low noise and high spatial and temporal resolution. Single ended DAS interrogation through a 2227 km line comprising 39 repeatered fiber spans is demonstrated with a 10 m spatial resolution, a 1.78 kHz sampling rate, and a strain resolution of 35 pε/√Hz for the outermost span. The technique allows for many DAS channels to be wavelength multiplexed on a single fiber pair. Addressing of spans with add/drop (A/D) multiplexers (MUX) is demonstrated with <-60 dB cross talk between spans.