Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System
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2016
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Abstract
Phase-sensitive optical time domain reflectometry (Š¤-OTDR) attracts much attention due to its capability of telling the type and position of an intrusion simultaneously. In recent decades, coherent Š¤-OTDR has been demonstrated to realize long-distance detection. For coherent Š¤-OTDR, there are three typical demodulation schemes in the reported studies. However, they still cannot realize real-time monitoring to satisfy practical demands. A simple and effective demodulation method based on self-mixing has been put forward to demodulate the beat signal in coherent Š¤-OTDR. It not only saves a local electrical oscillator and frequency locked loop, but also demodulates the beat signal without residual frequency. Several vibrations with different frequency were separately applied at the same location of a 42.5 km fiber. The spatial resolution of 10 m and frequency response range from 8 Hz to 980 Hz have been achieved. The precise location with signal-to-noise ratio of 21.4 dB and broadband measurement demonstrate the self-mixing scheme can demodulate the coherent Š¤-OTDR signal effectively.
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he2016selfmixingsensors
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| Authors | He, Haijun;Shao, Li-Yang;Li, Zonglei;Zhang, Zhiyong;Zou, Xihua;Luo, Bin;Pan, Wei;Yan, Lianshan; |
| Journal | sensors |
| Year | 2016 |
| DOI | DOI not found |
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