23 April 2017 Coherent Pound-Drever-Hall technique for high resolution fiber optic strain sensor at very low light power
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230V (2017) https://doi.org/10.1117/12.2265298
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
Pound-Drever-Hall (PDH) technique has been widely adopted for ultrahigh resolution fiber-optic sensors, but its performance degenerates seriously as the light power drops. To solve this problem, we developed a coherent PDH technique for weak optical signal detection, with which the signal-to-noise ratio (SNR) of demodulated PDH signal is dramatically improved. In the demonstrational experiments, a high resolution fiber-optic sensor using the proposed technique is realized, and n"-order strain resolution at a low light power down to -43 dBm is achieved, which is about 15 dB lower compared with classical PDH technique. The proposed coherent PDH technique has great potentials in longer distance and larger scale sensor networks.
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Mengxin Wu, Mengxin Wu, Qingwen Liu, Qingwen Liu, Jiageng Chen, Jiageng Chen, Zuyuan He, Zuyuan He, } "Coherent Pound-Drever-Hall technique for high resolution fiber optic strain sensor at very low light power", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230V (23 April 2017); doi: 10.1117/12.2265298; https://doi.org/10.1117/12.2265298
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