Abstract
This paper proposes a novel parallel detection scheme for enhancing the
sensitivity of coherent optical time domain reflectometry (C-OTDR). The
proposed scheme is based on frequency-division multiplexing using a phase
modulator and software processing. The performance advantages of the
proposed method are clarified experimentally by comparison with a
conventional C-OTDR. The detection sensitivity performance with the proposed
method, operating at 40 frequency-division multiplexing, was improved by
about 8 dB compared with the conventional method. We also clarified that the
3 dB resolution and Rayleigh dead zone of conventional C-OTDR and the
proposed method were almost the same at a spatial resolution of 1 km.
© 2011 IEEE
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