Comparative study on reduced impacts of Brillouin pump depletion and nonlinear amplification in coded DBA-BOTDA  

作　　者：Kai Lin Xinhong Jia Huiliang Ma Cong Xu Xuan Zhang and Lei Ao 林凯;贾新鸿;马辉亮;徐聪;张旋;敖磊(College of Physics and Electronic Engineering, Sichuan Normal University)

机构地区：College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu 610101,China

出　　处：《Chinese Optics Letters》2018年第9期27-33,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.61205079);the Scientific Research Fund of Sichuan Provincial Education Department(No.18ZA0401);the Open Experimental Programs of Sichuan Normal University(No.KFSY2017083)

摘　　要：The impacts of Brillouin pump depletion and nonlinear amplification in coded long-range Brillouin optical time-domain analysis （BOTDA） based on distributed Brillouin amplification （DBA） were studied. The error of Brillouin frequency shift （BFS） due to Brillouin pump depletion was compared for DBA-BOTDA using non-cyclic and cyclic coding. For non-cyclic coding, significant over- and under-shoots of BFS were found in the range with larger BFS variation, such as hot spot. The impact of Brillouin pump depletion can be reduced considerably by cyclic coding. Furthermore, to compensate the BFS error due to nonlinear amplification, a simple and effective log linearization was oroDosed and demonstrated.The impacts of Brillouin pump depletion and nonlinear amplification in coded long-range Brillouin optical time-domain analysis （BOTDA） based on distributed Brillouin amplification （DBA） were studied. The error of Brillouin frequency shift （BFS） due to Brillouin pump depletion was compared for DBA-BOTDA using non-cyclic and cyclic coding. For non-cyclic coding, significant over- and under-shoots of BFS were found in the range with larger BFS variation, such as hot spot. The impact of Brillouin pump depletion can be reduced considerably by cyclic coding. Furthermore, to compensate the BFS error due to nonlinear amplification, a simple and effective log linearization was oroDosed and demonstrated.

关 键 词：Comparative study on reduced impacts of Brillouin pump depletion and nonlinear amplification in coded DBA-BOTDA MWS BFS DBA 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]