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

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4 Author(s)
Foaleng, S.M. ; Inst. of Electr. Eng., Ecole Polytech. Fed. de Lausanne, Lausanne, Switzerland ; Tur, M. ; Beugnot, J.-C. ; Thevenaz, L.

High spatial ( cm) 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 (2) , using a 500 ps (5 cm) phase shift pulse.

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Lightwave Technology, Journal of  (Volume:28 ,  Issue: 20 )