Time-expanded phase-sensitive optical time-domain reflectometry
作者机构：Departamento de ElectronicaUniversidad de AlcalaEscuela Politecnica Superior28805 MadridSpain Instituto deóptica"Daza de Valdes"IO-CSICC/Serrano 12128006 MadridSpain GROC-UJIInstitute of New Imaging TechnologiesUniversity Jaume112071 CastellonSpain
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2021年第10卷第3期
页 面：443-454页
核心收录：
学科分类：070207[理学-光学] 0808[工学-电气工程] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：Comunidad de Madrid and FEDER Program under grant SINFOTON2-CM:P2018/NMT-4326,Generalitat Valenciana under grant PROMETEO/2020/029 the European Research Council(OCEAN-DAS:ERC-2019-POC-875302) the Spanish Government under projects RTI2018-097957-B-C31,RTI2018-097957-B-C32,and RTI2018-097957-B-C33 Universitat Jaume I under projea UJIB2019-45.M.S.A.,H.F.M.,V.D. M.R.F.R.acknowledge financial support from the Spanish MICINN under contract no.PRE-2019-087444,IJCI-2017-33856,RYC-2017-23668,and IJC2018-035684-I,respectively.
摘 要：Phase-sensitive optical time-domain reflectometry(CDOTDR)is a well-established technique that provides spatiotemporal measurements of an environmental variable in real time.This unique capability is being leveraged in an everincreasing number of applications,from energy transportation or civil security to seismology.To date,a wide number of different approaches have been implemented,providing a plethora of options in terms of performance(resolution,acquisition bandwidth,sensitivity or range).However,to achieve high spatial resolutions,detection bandwidths in the GHz range are typically required,substantially increasing the system cost and complexity.Here,we present a novel OOTDR approach that allows a customized time expansion of the received optical traces.Hence,the presented technique reaches cm-scale spatial resolutions over t km while requiring a remarkably low detection bandwidth in the MHz regime.This approach relies on the use of dual-comb spectrometry to interrogate the fibre and sample the backscattered light.Random phase-spectral coding is applied to the employed combs to maximize the signal-to-noise ratio of the sensing scheme.A comparison of the proposed method with alternative approaches aimed at similar operation features is provided,along with a thorough analysis of the new trade-offs.Our results demonstrate a radically novel high-resolution OOTDR scheme,which could promote new applications in metrology,borehole monitoring or aerospace.
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