Interference fading suppression in φ-OTDR using space-division multiplexed probes

Zhiyong Zhao, Huan Wu, Junhui Hu, Kun Zhu, Yunli Dang, Yaxi Yan, Ming Tang, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


We propose and experimentally demonstrate a novel interference fading suppression method for phase-sensitive optical time domain reflectometry (φ-OTDR) using space-division multiplexed (SDM) pulse probes in a few-mode fiber. The SDM probes consist of multiple different modes, and three spatial modes (LP01, LP11a, and LP11b) are used in this work for the proof of concept. Firstly, the Rayleigh backscattering light of different modes is experimentally characterized, and it turns out that the waveforms of the φ-OTDR traces for distinct modes are all different and independent. Thanks to the spatial difference of the fading positions for distinct modes, multiple probes from spatially multiplexed modes can be used to suppress the interference fading in φ-OTDR. Then, the performances of the φ-OTDR systems using a single probe and multiple probes are evaluated and compared. Specifically, the statistical analysis shows that the fading probabilities over both the fiber length and the time scale are reduced significantly by using multiple SDM probes, which verifies the significant performance improvement on fading suppression. By introducing the concept of SDM to φ-OTDR, the proposed novel interference fading suppression method avoids the complicated frequency or phase modulation, which has the advantages of simplicity, good effectiveness and high reliability.

Original languageEnglish
Article number450754
Pages (from-to)15452-15462
Number of pages11
JournalOptics Express
Issue number10
Publication statusPublished - 10 May 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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