Abstract

Thanks to a double-frequency phase modulation scheme, we report a vector Brillouin optical time-domain analyzer (BOTDA). This BOTDA has a high immunity level to noise, and it features a phase spectrogram capability. It is well suited for complex situations involving several acoustic resonances, such as high-order longitudinal modes. It has notably been used to characterize a dispersion-shifted fiber, allowing us to report spectrograms with multiple acoustic resonances. A very high $57\mathrm{dB}$ dynamic range is also reported for 100-ns-long pulses simultaneously with a $16\mathrm{cm}$ numerical resolution.

© 2010 Optical Society of America

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