Abstract

A kind of high-repetition-rate distributed Brillouin sensor is proposed and experimentally demonstrated based on optical correlation-domain analysis with differential frequency modulation, where the optical frequencies of the pump and the probe waves are modulated at slightly different RFs so that the temporal position of the measurement is continuously and repeatedly swept along a fiber under test. A distribution map of Brillouin frequency variation along a $100\mathrm{m}$ optical fiber is acquired at a repetition rate of $20\mathrm{Hz}$ with an accuracy of $\pm 2.5\mathrm{MHz}$ and a spatial resolution of about $80\mathrm{cm}$.

© 2011 Optical Society of America

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