RT info:eu-repo/semantics/article T1 SNR enhancement in high-resolution phasesensitive OTDR systems using chirped pulse amplification concepts A1 Pastor Graells, Juan A1 Romero Cortés, Luis A1 Fernández Ruiz, María del Rosario A1 Fidalgo Martins, Hugo A1 Azaña, José A1 Martín López, Sonia A1 González Herráez, Miguel K1 Fiber optics sensors K1 Optical time domain reflectometry K1 Chirping K1 Pulse compression K1 Ciencias tecnológicas K1 Electrónica K1 Technology K1 Electronics AB Phase-sensitive optical time-domain reflectometry(φOTDR) is widely used for the distributed detection ofmechanical or environmental variations with resolutionsof typically a few meters. The spatial resolution of thesedistributed sensors is related to the temporal width ofthe input probe pulses. However, the input pulse widthcannot be arbitrarily reduced (to improve the resolution),since a minimum pulse energy is required to achieve a goodlevel of signal-to-noise ratio (SNR), and the pulse peakpower is limited by the advent of nonlinear effects. In thisLetter, inspired by chirped pulse amplification concepts, wepresent a novel technique that allows us to increase the SNRby several orders of magnitude in φOTDR-based sensorswhile reaching spatial resolutions in the centimeter range.In particular, we report an SNR increase of 20 dB over thetraditional architecture, which is able to detect strain eventswith a spatial resolution of 1.8 cm. PB Optical Society of America (OSA) SN 0146-9592 YR 2017 FD 2017-05-01 LK http://hdl.handle.net/10017/29272 UL http://hdl.handle.net/10017/29272 LA eng NO European Commission DS MINDS@UW RD 29-mar-2024