Hybrid grating in reduced-diameter fiber for temperature-calibrated high-sensitivity refractive index sensing

Abstract

We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG's Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium's refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water's RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

Publication DOI: https://doi.org/10.3390/app9091923
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Funding Information: This research was supported by the Fundamental Research Funds for the Central Universities (No. 3102019PB005).This research was funded by the National Natural Science Foundation of China (Grant Nos. 61775182, 61505165 and 61705185), the Natural Science Ba
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Uncontrolled Keywords: Fiber Bragg grating,Refractive index sensing,Temperature dependence of the refractive index of water,Tilted fiber grating,General Materials Science,Instrumentation,General Engineering,Process Chemistry and Technology,Computer Science Applications,Fluid Flow and Transfer Processes
Publication ISSN: 2076-3417
Last Modified: 15 Jul 2024 07:55
Date Deposited: 04 Jul 2019 08:29
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-05-10
Accepted Date: 2019-05-06
Authors: Jiang, Biqiang
Hao, Zhen
Feng, Dingyi
Zhou, Kaiming (ORCID Profile 0000-0002-6011-1912)
Zhang, Lin (ORCID Profile 0000-0002-1691-5577)
Zhao, Jianlin

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