149862 20251017144617.0 doi 10.1109/JSEN.2021.3125921 sideral 125439 ART-2021-125439 eng Preciado, Javier (orcid)0000-0001-5898-8777 Range and bandwidth extension in Direct-detection C-OTDR using optical repeaters 2021 Sensing range and response bandwidth are the main parameters that define the performance of distributed optical fiber sensors. In this work, a novel scheme based on the use of in-line optical repeaters is proposed to extend the sensing range of distributed acoustic sensors (DAS) based in direct-detection coherent optical time-domain reflectometry (DD C-OTDR). The proposed regenerators comprise three different stages that reamplify the incoming pulse amplitude, synchronize the acquisition using the incoming pulse and also detect the backscattered signal from the next span. With repeaters placed every 40 km along a fiber under test (FUT), we have achieved a total sensing range above 120 km while keeping a pulse frequency of 2.5 kHz (1.25 kHz bandwidth). At the end of each segment of the FUT we experimentally demonstrate the correct measurement of a 15 ne stimulus, with and an average degradation lower than 3 dB per fiber span. The experimental results show that an extension of the sensing range in DD C-OTDR can be achieved without reducing the frequency response bandwidth or increasing the scheme complexity. info:eu-repo/grantAgreement/ES/MINECO/DI-17-09169 info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5212-8 info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.325 2021 INSTRUMENTS & INSTRUMENTATION 14 / 64 = 0.219 2021 Q1 T1 PHYSICS, APPLIED 47 / 161 = 0.292 2021 Q2 T1 ENGINEERING, ELECTRICAL & ELECTRONIC 83 / 274 = 0.303 2021 Q2 T1 0.926 2021 Instrumentation 2021 Q1 Electrical and Electronic Engineering 2021 Q1 6.1 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sevillano, Pascual Universidad de Zaragoza (orcid)0000-0002-4094-3826 Heras, Carlos Universidad de Zaragoza (orcid)0000-0001-5608-8679 Subias, Jesus Universidad de Zaragoza (orcid)0000-0002-2244-170X Sanahuja, David Universidad de Zaragoza (orcid)0000-0002-2660-5652 Carretero, Enrique Universidad de Zaragoza (orcid)0000-0002-9413-0265 Martinez, Juan José 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 5008 800 Universidad de Zaragoza Dpto. Ingeniería Electrón.Com. Área Teoría Señal y Comunicac. 21, 24 (2021), 27526-27531 IEEE sens. j. IEEE SENSORS JOURNAL 1530-437X 1411629 http://zaguan.unizar.es/record/149862/files/texto_completo.pdf Versión publicada 3396068 http://zaguan.unizar.es/record/149862/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:149862 articulos driver 2025-10-17-14:20:25 ARTICLE