doi:10.5220/0007386401960200engSanahuja, DavidPreciado, JavierSubías, JesúsHeras, CarlosHidalgo, LucíaSalinas, IñigoSevillano, PascualMartínez, JuanVillafranca, AsierLong-range (>100km) distributed vibration sensor based on F-OTDR technique with spread amplification and detection of probe pulsesART-2019-134154This paper presents a set of results to demonstrate a long-range (>100km) distributed vibration sensor (DAS) based on the Coherent Optical Time Domain Reflectometry (Φ-OTDR) technique using distributed amplification of the probe pulses and detection of the backscattered traces, which demonstrates great capability to achieve long-range distances with great sensitivity. In this case, optical amplifiers have been placed along the sensing optical fiber, each one followed by a detection stage. Results for some traces detected in each of the spans along the sensing fiber, and some measurements of stimuli produced by a vibration at the end of each of the sections of the sensing fiber, are showed here. This work, framed in the project SACOH (Long-range Distributed Vibration Sensing by Coherent Rayleigh Backscattering), has been carried out in collaboration between the University of Zaragoza and the company APL (Aragón Photonics Labs).2019http://zaguan.unizar.es/record/15121310.5220/0007386401960200http://zaguan.unizar.es/record/151213oai:zaguan.unizar.es:151213info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5212-8Photoptics (Setúbal) 7, 1 (2019), 196-200by-nc-ndhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.esinfo:eu-repo/semantics/closedAccess