50 km-Range Brillouin Optical Correlation Domain Analysis with First-Order Backward Distributed Raman Amplification

Gukbeen Ryu, Gyu Tae Kim, Kwang Yong Song, Sang Bae Lee, Kwanil Lee

Research output: Contribution to journalArticle

Abstract

We demonstrate the enlargement of sensing range of Brillouin optical correlation domain analysis (BOCDA) system by introducing the first-order distributed Raman amplification. The time-domain data processing is adopted for the BOCDA system utilizing a gated Brillouin pump, and the Raman amplification is applied to compensate for the depletion of Brillouin pump induced by Rayleigh scattering and Brillouin interaction. The Raman pump is injected in the opposite direction to the propagation of Brillouin pump, where the pumping scheme is optimized by simulations. A differential measurement scheme is additionally introduced for improving spatial resolution and dynamic range. In experiments, we measure the strain distribution along a 52.1 km sensing fiber with 7 cm spatial resolution, where the number of resolving points of measurement is more than 744 000.

Original languageEnglish
Article number9115227
Pages (from-to)5199-5204
Number of pages6
JournalJournal of Lightwave Technology
Volume38
Issue number18
DOIs
Publication statusPublished - 2020 Sep 15

Keywords

  • Optical fiber sensor
  • Raman scattering
  • Stimulated brillouin scattering
  • time domain analysis

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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