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Optical-pulse-coding phase-sensitive OTDR with mismatched filtering

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Abstract

Optical-pulse-coding (OPC) phase-sensitive optical time-domain reflectometry (Φ-OTDR) sends a train of pulses into a fiber, and has high spatial resolution decided by the duration of a subpulse while achieving signal-to-noise ratio (SNR) enhancement. OPC Φ-OTDR with a shorter measurement time is favorable. However, the scan rate, which is the reciprocal of the measurement time, is not easy to optimize. In this paper, mismatched filtering is introduced into OPC Φ-OTDR for the first time, which can reach the theoretical limit of scan rate determined by the fiber length. Also, the initial phase of each subpulse can be set arbitrarily, showing the capacity for controlling the location of interference fading. Although the design of the mismatched filter is based on the least-squares criterion, satisfactory decoding results are obtained, indicating that more advanced mismatched filter designs are worthy of further investigation to achieve higher performance.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 62075030, 61731006), Sichuan Provincial Project for Outstanding Young Scholars in Science and Technology (Grant No. 2020JDJQ0024), and the 111 Project (Grant No. B14039).

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Authors and Affiliations

  1. Key Lab of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Yongxin Liang, Zinan Wang, Shengtao Lin, Yuyao Wang, Jialin Jiang, Zijie Qiu, Chunye Liu & Yunjiang Rao

  2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Zinan Wang

  3. Research Center for Optical Fiber Sensing, Zhejiang Laboratory, Hangzhou, 310000, China

    Yunjiang Rao

Authors
  1. Yongxin Liang
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  2. Zinan Wang
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  3. Shengtao Lin
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  4. Yuyao Wang
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  5. Jialin Jiang
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  6. Zijie Qiu
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  7. Chunye Liu
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  8. Yunjiang Rao
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Correspondence to Zinan Wang.

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Liang, Y., Wang, Z., Lin, S. et al. Optical-pulse-coding phase-sensitive OTDR with mismatched filtering. Sci. China Inf. Sci. 65, 192303 (2022). https://doi.org/10.1007/s11432-021-3329-6

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  • DOI: https://doi.org/10.1007/s11432-021-3329-6

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