Performance limit of a multi-frequency probe based coherent optical time domain reflectometry caused by nonlinear effects  

作　　者：吕立冬 宋跃江 朱帆 张旭苹 

机构地区：[1]Institute of Optical Communication Engineering,Nanjing University

出　　处：《Chinese Optics Letters》2012年第4期14-17,共4页中国光学快报（英文版）

基　　金：supported by the National"973"Program of China(No.2010CB327803);the National Natural Science Foundation of China(Nos.61027617,60907022,and 60644001)

摘　　要：The nonlinear effects that limit the performance of the multi-frequency probe（MFP）based coherent optical time domain reflectometry（C-OTDR）are investigated.Based on theoretical analysis and experimental results,compared with conventional C-OTDR,when the probe pulse has power gradient within the pulse width,self-phase modulation（SPM）and cross-phase modulation（XPM）are strengthened in the new C-OTDR scheme.The generation of four-wave mixing（FWM）is dependent on SPM and XPM,and with modulation frequency of phase modulator higher than 40 MHz,the stimulated Brillouin scattering（SBS） threshold can be enhanced by more than 5 dB,which benefits the maximum dynamic range of the MFP C-OTDR.The nonlinear effects that limit the performance of the multi-frequency probe（MFP）based coherent optical time domain reflectometry（C-OTDR）are investigated.Based on theoretical analysis and experimental results,compared with conventional C-OTDR,when the probe pulse has power gradient within the pulse width,self-phase modulation（SPM）and cross-phase modulation（XPM）are strengthened in the new C-OTDR scheme.The generation of four-wave mixing（FWM）is dependent on SPM and XPM,and with modulation frequency of phase modulator higher than 40 MHz,the stimulated Brillouin scattering（SBS） threshold can be enhanced by more than 5 dB,which benefits the maximum dynamic range of the MFP C-OTDR.

关 键 词：Four wave mixing Permittivity measurement Probes Self phase modulation 

分 类 号：TN929.1[电子电信—通信与信息系统]