High spatial and spectral resolution long-range sensing using Brillouin echoes

Stella M. Foaleng, Moshe Tur, Jean Charles Beugnot, Luc Thévenaz

Research output: Contribution to journalArticlepeer-review

Abstract

High spatial (∼) and spectral (∼MHz) resolution Brillouin sensing is realized with enhanced signal to noise ratio using a pre-activated acoustic field and an optical phase control over the interrogating pulse. Pre-activation of the acoustic field preserves the Brillouin natural linewidth and a differential gain technique extends the method to long ranges. Experimentally, fully resolved measurements of the Brillouin frequency shift of a 5 cm spot perturbation at the far end of a 5 km fiber have been performed with a frequency resolution of 3 MHz (2σ), using a 500 ps (5 cm) π phase shift pulse.

Original languageEnglish
Article number5565369
Pages (from-to)2993-3003
Number of pages11
JournalJournal of Lightwave Technology
Volume28
Issue number20
DOIs
StatePublished - 2010

Keywords

  • Brillouin echoes
  • distributed fiber sensor
  • fiber optics sensors
  • stimulated Brillouin scattering

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