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,com...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.展开更多
基金supported by the National"973"Program of China(No.2010CB327803)the National Natural Science Foundation of China(Nos.61027617,60907022,and 60644001)
文摘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.
