A few mode fiber curvature sensor based on two spherical-shape structures modal interferometer

Xinghu Fu; Siwen Wang; Shunyang Zhang; Qin Liu; Qifeng Li; Haiyang Xie; Guangwei Fu; Weihong Bi; Yanjun Li

doi:10.1117/12.2247379

25 October 2016 A few mode fiber curvature sensor based on two spherical-shape structures modal interferometer

Xinghu Fu, Siwen Wang, Shunyang Zhang, Qin Liu, Qifeng Li, Haiyang Xie, Guangwei Fu, Weihong Bi, Yanjun Li

Proceedings Volume 10158, Optical Communication, Optical Fiber Sensors, and Optical Memories for Big Data Storage; 101581D (2016) https://doi.org/10.1117/12.2247379
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

In order to improve the equilibrium between fiber sensor performance and cost, a curvature sensor based on Few Mode Fiber(FMF) is proposed. A length of FMF is spliced with waist enlarge between two Single mode Fibers(SMFs) to form two spherical- shape structure. Fiber core mode interfere with clad mode due to the excite and couple function of spherical-shape structure, respectively. The phase difference between the cladding and core regions of the fiber changes with the external strain increase, and then the interference spectrum changes. Two sensors with different length of FMF are fabricated, and the transmission spectrum are obtained. The result shows the optical power at certain wavelength is increasing with the curvature increasing. When the curvature range is 0~0.42m^-1 and the FMF is 5.7cm, the curvature sensitivity can be 11.22dB/m^-1. When the FMF is 5.9cm, the curvature sensitivity can be climbed to 14.08dB/m^-1.

Citation Download Citation

Xinghu Fu, Siwen Wang, Shunyang Zhang, Qin Liu, Qifeng Li, Haiyang Xie, Guangwei Fu, Weihong Bi, and Yanjun Li "A few mode fiber curvature sensor based on two spherical-shape structures modal interferometer", Proc. SPIE 10158, Optical Communication, Optical Fiber Sensors, and Optical Memories for Big Data Storage, 101581D (25 October 2016); https://doi.org/10.1117/12.2247379

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