Bend-insensitive distributed sensing in singlemode-multimode-singlemode optical fiber structure by using Brillouin optical time-domain analysis

Pengbai Xu; Hongying Zhang; Zhiwei Lu; Liang Chen; Xiaoyi Bao; Yongkang Dong

doi:10.1117/12.2194416

28 September 2015 Bend-insensitive distributed sensing in singlemode-multimode-singlemode optical fiber structure by using Brillouin optical time-domain analysis

Pengbai Xu, Hongying Zhang, Zhiwei Lu, Liang Chen, Xiaoyi Bao, Yongkang Dong

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96344Y (2015) https://doi.org/10.1117/12.2194416
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

We propose a bend-insensitive distributed Brillouin optical fiber sensing by using a singlemode-multimode-singlemode optical fiber structure for the first time to the best of our knowledge. The sensing fiber is a graded-index multimode fiber (GI-MMF) sandwiched by two standard single-mode fibers (SMFs) with centrally alignment splicing at the interface between GI-MMF and SMF to excite the fundamental mode only in GI-MMF. The sensing system can resist a minimal bend radius of 1.25mm while maintaining the measurement performance, with which the measured coefficient of strain is 421.6MHz/%. We also demonstrate that the higher-order modes exciting in GI-MMF can be easily influenced by bending, so that the fundamental mode exciting is essential for bend-insensitive distributed sensing.

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Pengbai Xu, Hongying Zhang, Zhiwei Lu, Liang Chen, Xiaoyi Bao, and Yongkang Dong "Bend-insensitive distributed sensing in singlemode-multimode-singlemode optical fiber structure by using Brillouin optical time-domain analysis", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96344Y (28 September 2015); https://doi.org/10.1117/12.2194416

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