Abstract
We demonstrate a novel distributed fiber vibration sensor based on the phase extraction from time-gated digital optical frequency domain reflectometry (TGD-OFDR), which have an advantage of wide dynamic range. With the much improved signal to noise ratio (SNR) compared to conventional phase-sensitive optical time domain reflectometry (OTDR), the phase of optical signals is extracted over a long distance up to 29 km with 2.2 m spatial resolution.
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