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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 28, Iss. 20 — Oct. 15, 2010
  • pp: 2993–3003

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

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

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


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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

Citation
Stella M. Foaleng, Moshe Tur, Jean-Charles Beugnot, and Luc Thévenaz, "High Spatial and Spectral Resolution Long-Range Sensing Using Brillouin Echoes," J. Lightwave Technol. 28, 2993-3003 (2010)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-28-20-2993

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