Concave-lens-like long-period fiber grating bidirectional high-sensitivity bending sensor

A novel bidirectional high-sensitivity fiber-optic bending sensor based on the concave-lens-like long-period fiber grating (CLL-LPFG) is designed and demonstrated. The CLL-LPFG is composed by an array of arc-shaped grating planes, and accordingly, its refractive index modulation serves as a concave...

Full description

Saved in:
Bibliographic Details
Published inOptics letters Vol. 42; no. 19; p. 3892
Main Authors Zhang, Yun-Shan, Zhang, Wei-Gang, Chen, Lei, Zhang, Yan-Xin, Wang, Song, Yu, Lin, Li, Yan-Ping, Geng, Peng-Cheng, Yan, Tie-Yi, Li, Xin-Yu, Kong, Ling-Xin
Format Journal Article
LanguageEnglish
Published United States 01.10.2017
Online AccessGet more information

Cover

More Information
Summary:A novel bidirectional high-sensitivity fiber-optic bending sensor based on the concave-lens-like long-period fiber grating (CLL-LPFG) is designed and demonstrated. The CLL-LPFG is composed by an array of arc-shaped grating planes, and accordingly, its refractive index modulation serves as a concave lens. As a result, the eigencladding mode of the device gets closer to the device surface than the conventional counterpart. Therefore, the proposed sensor provides a more sensitive result. The experimental results show that the bending sensitivities of the CLL-LPFG reach -32.782  nm/m within the bending range of 0-2.08  m , which is about sixfold compared to the reported arts. The sensitivity can be potentially improved by optimizing the grating parameters, and the temperature characteristics of the CLL-LPFG can be used to manipulate the grating spectrum.
ISSN:1539-4794
DOI:10.1364/OL.42.003892