title: Simplex-coded BOTDA fiber sensor with 1 m spatial resolution over a 50 km range.
abstract: In this Letter, we propose the use of optical pulse coding techniques for long-range distributed sensors based on Brillouin optical time-domain analysis (BOTDA). Compared to conventional BOTDA sensors, optical coding provides a significant sensing-range enhancement, allowing for temperature and strain measurements with 1 m spatial resolution over 50 km of standard single-mode fiber, with an accuracy of 2.2 degrees C/44 muepsilon, respectively.
authors.affiliation: EPFL Swiss Federal Institute of Technology, Institute of Electrical Engineering, Group for Fiber Optics,STI IEL GR-SCI Station 11, CH-1015 Lausanne, Switzerland. m.soto@sssup.it
authors.forename: Marcelo A
authors.initials: MA
authors.lastname: Soto
authors.forename: Gabriele
authors.initials: G
authors.lastname: Bolognini
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Di Pasquale
authors.forename: Luc
authors.initials: L
authors.lastname: Thévenaz