Abstract
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.
© 2012 Chinese Optics Letters
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