Brillouin expanded time-domain analysis based on dual optical frequency combs

作     者：Jae Hyeong Youn Kwang Yong Song Sonia Martin-Lopez Miguel Gonzalez-Herraez María R.Fernández-Ruiz Jae Hyeong Youn;Kwang Yong Song;Sonia Martin-Lopez;Miguel Gonzalez-Herraez;María R.Fernández-Ruiz

作者机构：Dept.of PhysicsChung-Ang UniversitySeoulKorea Dept.of ElectronicsUniversidad de AlcaláMadridSpain 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2024年第13卷第8期

页      面：1534-1544页

核心收录：

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)(No.NRF-2022M3K4A1097124) by the Institute of Information and Communications Technology Planning and Evaluation(IITP)grant funded by the Korea government(MSIT)(No.1711159646) supported by MCIN/AEI/10.13039/501100011033 and European Union«NextGenerationEU»/PRTR under grant RYC2021-032167-I supported by MICIU/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR Program(Grant PSI ref.PLEC2021-007875 and TREMORS ref.CPP2021-008869),MICIU/AEI/10.13039/501100011033 and FEDER,EU(PID2021-128000OBC21,PID2021-128000OB-C22,PID2022-140963OA-100) the European Innovation Council(Grant SAFE:ref.101098992) MICIU/AEI/10.13039/501100011033,co-funded by European Commission(GA N°101069750)under the CETPartnership 2022 joint call(Project SEASNAKE+,ref:PCI2023-145978-2) HORIZON-INFRA-2022-TECH-01-SUBMERSE-101095055 

主　　题：pump optical fiber 

摘      要：Brillouin Optical Time-Domain Analysis(BOTDA)is a widely-used distributed optical fiber sensing technology employing pulse-modulated pump waves for local information retrieval of the Brillouin gain or loss *** spatial resolution of BOTDA systems is intrinsically linked to pulse duration,so high-resolution measurements demand high electronic bandwidths inversely proportional to the *** paper introduces Brillouin Expanded Time-Domain Analysis(BETDA)as a modified BOTDA system,simultaneously achieving high spatial resolution and low detection *** two optical frequency combs(OFCs)with different frequency intervals as pump and probe,local Brillouin gain spectra are recorded by their spectral beating traces in an expanded time domain.A 2-cm-long hotspot located in a 230m single-mode fiber is successfully measured in the time domain with a detection bandwidth of less than 100 kHz using dual OFCs with tailored spectral phase,line spacing,and bandwidth.