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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