Chinese Optics Letters, 2019, 17 (7): 070601, Published Online: Jun. 21, 2019   

Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure Download: 737次

Author Affiliations
1 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
2 Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Abstract
A refractive index intensity detecting sensor with long-period grating written in the single-mode–thin-core–single-mode fiber (STS) structure is proposed and optimized theoretically. The sensor is composed of two single-mode fibers connected by a section of long-period fiber grating fabricated on thin-core fiber. After optimization and benefitting from the phase matching point, the loss peak of the structure can reach 62.8 dB theoretically. The wavelength of the characteristic peak is fixed at the phase matching point, so intensity detection can be achieved. The sensitivity can reach 272.5 dB/RIU. The structural optimization in this Letter provides a reference for the fabrication of an easy-made all-fiber sensor without extra cladding.

Zuliang Ruan, Li Pei, Jingjing Zheng, Jianshuai Wang, Liangying Wu, Tigang Ning, Ji Wang. Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure[J]. Chinese Optics Letters, 2019, 17(7): 070601.

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