Journal
OPTICS EXPRESS
Volume 26, Issue 13, Pages 16138-16146Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.016138
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Funding
- National Key RD Plan of China [2017YFB0405500]
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In order to solve fading problem and realize sub-meter spatial resolution in DAS, this paper proposes a novel configuration of time-gated digital optical frequency domain rellectometry (TGD-OFDR) based on optical intensity modulator (IM). IM has a large modulation bandwidth and the positive and negative harmonics can be fully used to suppress fading while the spatial resolution remains unchanged. In experiments, with fading suppressed, the spatial resolution of DAS is 0.8 m and the strain resolution is about 245.6 pe/A/Hz along the total 9.8-km sensing fiber. The response bandwidth of vibration is 5 kHz, only limited by the fiber length. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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