Ultra-long Distance Distributed Intrusion Detecting System Assisted With In-line Amplification

作者：Lai, Macheng; Peng, Kuan; Luo, Yiyang; Li, Xiaolei; Li, Yanpeng; Ai, Fan; Liu, Deming; Sun, Qizhen^*

来源：IEEE Photonics Journal, 2017, 9(2): 6801810.

DOI：10.1109/JPHOT.2017.2688471

• Fiber-optic distributed sensor
• intrusion detecting
• ultra-long sensing distance
• bi-directional amplification
• polymer package

An ultra-long distance distributed intrusion detecting system assisted with power amplification and sensitivity enhancement is proposed and demonstrated. First, through introducing multiple bidirectional amplifiers into the unbalanced Mach-Zehnder/Sagnac interferometer-based fiber sensing link, the sensing distance is remarkably extended, and second, the signal-to-noise ratio of this sensing system is significantly improved from less than 2 to 6-8 dB by coating the sensing fiber with organic silicone polymer. Furthermore, the high-order downtrend fitting function is adopted to implement the intrusion locating of ultralong distance sensing; the zero-padding fast Fourier transform algorithm and multipleaveraging method are jointly utilized for the improvement of the locating accuracy. Experimentally, a proof-of-concept distributed intrusion detecting system is constructed with the employment of bidirectional amplification. In particular, the ultra-long sensing distance up to 226.337 km is implemented, which is the reported longest distributed sensing system to the best of our knowledge.

• 出版日期2017-4
• 单位华中科技大学