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Post chemical etching of tapered seven-core fiber sensor for enhanced figure of merit

Zhen Tian, Yicun Yao, Jinhui Yuan, Liqiang Zhang, Nan-Kuang Chen, Yanqing Zhang, Minghong Wang, and Qiang Wu

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Abstract

A post chemical etching process to a tapered seven-core fiber (TSCF) is proposed and experimentally demonstrated to effectively adjust the mode profiles of high-order supermodes, aimed to improve the figure of merit (FOM). The experimental results show that the FOM of an etched TSCF is as high as 1431.36 1/RIU, a 7.32-times enhancement compared with that of TSCF without etching, provided the TSCF has the same taper waist diameter of 19.20 µm. The proposed method opens a new, to the best of our knowledge, method for optimizing optical fiber sensor performance.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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