Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 36, Issue 4, Pages 1197-1203Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2767086
Keywords
Direct detection; distributed acoustic sensing; frequency division multiplexing; phase-sensitive OTDR
Funding
- Natural Science Foundation of China [61775132, 61735015, 61327812]
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The frequency division multiplexing (FDM) technique is first introduced into a direct-detection phase-sensitive OTDR to improve the distributed acoustic sensing performance by using a frequency step sweeping laser source and a dual-pulse heterodyne detection scheme. A raised-cosine-shaped pulse is used to suppress the crosstalk in the FDM technique. By using this technique, a 40-kS/s sampling rate to vibration is realized with a 10-km measurement range, which implies the tradeoff relationship between the frequency response and the measurement range is broken. In the experiment, vibrations with different frequencies are measured to validate the effectiveness of the proposed technique. A 20-kHz frequency response is achieved over a 10-km measurement distance, and the frequency response shows a good flatness with a fluctuation of similar to 0.5 dB.
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