Abstract
We show that the performance of phase-noise-compensated
optical-frequency-domain reflectometry (PNC-OFDR) is affected by the
acoustic phase noise caused by environmental acoustic perturbations applied
to test fibers. When both the auxiliary interferometer and the fiber under
test are insulated against acoustic perturbation, the theoretical spatial
resolution is obtained. This means that a laser-induced phase noise
compensation scheme with a concatenative reference method (CRM) works almost
ideally and eliminates the phase noise even over a 40-km range, with 16-fold
concatenation. We also reveal that even when we use a laser with a very
narrow linewidth of a few kHz, the phase noise of the laser remains a
dominant factor in performance degradation, and the CRM works effectively
over the range. Test results for an actual fiber cable installed in
underground show that there was no severe degradation in performance, and
that PNC-OFDR sustained its unique high resolution in actual field
use.
© 2010 IEEE
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