Bi-directional brillouin optical time domain analyzer system for long range distributed sensing

Nan Guo, Liang Wang, Jie Wang, Chao Jin, Hwa Yaw Tam, Aping Zhang, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


We propose and experimentally demonstrate a novel scheme of bi-directional Brillouin time domain analyzer (BD-BOTDA) to extend the sensing range. By deploying two pump-probe pairs at two different wavelengths, the Brillouin frequency shift (BFS) distribution over each half of the whole fiber can be obtained with the simultaneous detection of Brillouin signals in both channels. Compared to the conventional unidirectional BOTDA system of the same sensing range, the proposed BD-BOTDA scheme enables distributed sensing with a performance level comparable to the conventional one with half of the sensing range and a spatial resolution of 2 m, while maintaining the Brillouin signal-to-noise ratio (SNR) and the BFS uncertainty. Based on this technique, we have achieved distributed temperature sensing with a measurement range of 81.9 km fiber at a spatial resolution of 2 m and BFS uncertainty of ~0.44 MHz without introducing any complicated components or schemes.
Original languageEnglish
Article number2156
JournalSensors (Switzerland)
Issue number12
Publication statusPublished - 16 Dec 2016


  • Brillouin scattering
  • Fiber optics sensors
  • Optical time domain analyzer
  • Temperature

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering


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