Brillouin Optical Correlation Domain Analysis Enhanced by Time-Domain Data Processing for Concurrent Interrogation of Multiple Sensing Points

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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We propose and experimentally demonstrate a Brillouin optical correlation domain analysis system adopting time-domain data processing and differential measurement for simultaneous interrogation of multiple sensing points. Continuous probe and pulsed pump waves are simultaneously frequency-modulated by a MHz-order sinusoidal RF wave so that multiple correlation peaks are sequentially generated according to the propagation of the pump along a fiber under test (FUT). The Brillouin gain spectrum of each correlation peak is obtained and interrogated by moving window averaging of the probe wave with a span of the period of the RF modulation, leading to the simultaneous monitoring of the multiple sensing points. In experiments, 148 correlation peaks are concurrently interrogated with a spatial resolution less than 3 cm along a 1530 m FUT.

Original languageEnglish
Article number8030064
Pages (from-to)5311-5316
Number of pages6
JournalJournal of Lightwave Technology
Volume35
Issue number24
DOIs
Publication statusPublished - 2017 Dec 15

Keywords

  • Optical fiber sensors
  • stimulated Brillouin scattering
  • time domain analysis

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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