Abstract
We show that fading noise in phase-noise compensated optical frequency
domain reflectometry (PNC-OFDR) can be effectively reduced by applying an
optical comb light source without any degradation in the reflectometry performance.
The optical comb light source provides broad wavelength tunability, which
is required for the frequency shift averaging (FSAV) for fading noise reduction
while maintaining a narrow linewidth of the fiber laser used as a seed lightwave.
We also clarify that PNC-OFDR with a reference interferometer simultaneously
compensates for both phase noise and group velocity dispersion (GVD) induced
by wideband measurement and a dispersive medium. These PNC-OFDR functions
enable us to realize a high accuracy measurement of Rayleigh scattering level
with low fading noise and high spatial resolution over 10 km range.
© 2013 IEEE
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