Abstract

We experimentally conduct Brillouin dynamic grating (BDG) operation using a 1-km-long four-mode fiber. By employing a simplified ring-cavity configuration with single-end pumping, the BDG is effectively generated in $ {{\rm LP}_{01}} $ mode within a range of 250 m, and three higher-order modes, namely, $ {{\rm LP}_{11b}} $, $ {{\rm LP}_{21a}} $, and $ {{\rm LP}_{02}} $, are chosen as probes to analyze the BDG with a spatial resolution of 1 m. To the best of our knowledge, this is the first time to characterize the responses of BDG frequency to temperature and strain for different modes in a conventional few-mode fiber. By employing the pump–probe pair of $ {{\rm LP}_{01}}{{\rm - LP}_{02}} $ mode, the highest temperature and strain sensitivities of 3.21 MHz/°C and $ - 0.0384\;{\rm MHz}/{\unicode{x00B5}}{\unicode{x03B5}} $ have been achieved. Also, the performance of simultaneously distributed temperature and strain sensing based on BDG is evaluated.

© 2020 Optical Society of America

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