Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure

Zuliang Ruan; Li Pei; Jingjing Zheng; Jianshuai Wang; Liangying Wu; Tigang Ning; Ji Wang

doi:10.3788/COL201917.070601

Journals >Chinese Optics Letters >Volume 17 >Issue 7 >Page 070601 > Article

Chinese Optics Letters
Vol. 17, Issue 7, 070601 (2019)

Intensity detecting refractive index sensors with long-period fiber gratings written in STS structure

Zuliang Ruan^1,2, Li Pei^1,2,*, Jingjing Zheng^1,2, Jianshuai Wang^1,2..., Liangying Wu^1,2, Tigang Ning^1,2 and Ji Wang^1,2|Show fewer author(s)

Author Affiliations

¹Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

²Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China

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DOI: 10.3788/COL201917.070601 Cite this Article Set citation alerts

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," Chin. Opt. Lett. 17, 070601 (2019) Copy Citation Text

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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.