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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 28,
  • Issue 20,
  • pp. 2993-3003
  • (2010)

High Spatial and Spectral Resolution Long-Range Sensing Using Brillouin Echoes

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Abstract

High spatial $({\sim} {\hbox {cm}})$ and spectral $({\sim} {\hbox {MHz}})$ 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 $(2\sigma)$, using a 500 ps (5 cm) $\pi$ phase shift pulse.

© 2010 IEEE

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