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

Optical time-domain reflectometry based on a Brillouin dynamic grating in an elliptical-core two-mode fiber

Yong Hyun Kim and Kwang Yong Song
Opt. Lett. 42(15) 3036-3039 (2017)

Few-mode fiber multi-parameter sensor with distributed temperature and strain discrimination

An Li, Yifei Wang, Jian Fang, Ming-Jun Li, Byoung Yoon Kim, and William Shieh
Opt. Lett. 40(7) 1488-1491 (2015)

Characterization of distributed modal birefringence in a few-mode fiber based on Brillouin dynamic grating

An Li, Qian Hu, Xi Chen, Byoung Yoon Kim, and William Shieh
Opt. Lett. 39(11) 3153-3156 (2014)

Dynamic strain measurement by a single-slope-assisted chaotic Brillouin optical correlation-domain analysis

Yahui Wang, Le Zhao, Mingjiang Zhang, Jianzhong Zhang, Lijun Qiao, Tao Wang, Shaohua Gao, Qian Zhang, and Yuncai Wang
Opt. Lett. 45(7) 1822-1825 (2020)

Stimulated Brillouin scattering in a tapered dual-core As₂Se₃-PMMA fiber for simultaneous temperature and strain sensing

Haiyang Wang, Song Gao, Chams Baker, Yuan Wang, Liang Chen, and Xiaoyi Bao
Opt. Lett. 45(12) 3301-3304 (2020)