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 

机构地区：[1]Dept.of Physics,Chung-Ang University,Seoul,Korea [2]Dept.of Electronics,Universidad de Alcalá,Madrid,Spain

出　　处：《Light(Science & Applications)》2024年第8期1534-1544,共11页光（科学与应用)（英文版）

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.

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 spectra.The spatial resolution of BOTDA systems is intrinsically linked to pulse duration,so high-resolution measurements demand high electronic bandwidths inversely proportional to the resolution.This paper introduces Brillouin Expanded Time-Domain Analysis(BETDA)as a modified BOTDA system,simultaneously achieving high spatial resolution and low detection bandwidth.Utilizing 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.

关 键 词：PUMP OPTICAL FIBER 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]