Temperature-calibrated high-precision refractometer using a tilted fiber Bragg grating

Biqiang Jiang*, Kaiming Zhou, Changle Wang, Yunhe Zhao, Jianlin Zhao, Lin Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present a refractometer with main- and vernier-scale to measure the refractive index (RI) of liquids with high precision by using the fine spectrum structure of a tilted fiber Bragg grating (TFBG). The absolute RI values are determined by the accurate wavelength of cut-off mode resonances. The main- and vernier-scale are calibrated by measuring large groups of fine spectra at different cut-off mode resonances in a small RI range, and the use of vernier-scale certainly reduces the RI measurement uncertainty resulted from the discrete cladding mode resonances. The performance of the TFBG-based vernier refractometer is experimentally verified by exploring the temperature dependence of RI of anhydrous ethanol in a near infrared region, showing an enhanced accuracy to the order of 10−4, high repeatability and temperature self-calibration capability.

Original languageEnglish
Pages (from-to)25910-25918
Number of pages9
JournalOptics Express
Issue number21
Publication statusPublished - 10 Oct 2017

Bibliographical note

© Copyright 2017 | The Optical Society. All Rights Reserved. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Funding: Marie Skłodowska-Curie Individual Fellowships in the European Union’s Horizon 2020 Research and Innovation Programme (660648); National Natural Science Foundation of China (61505165); Natural Science Basic Research Plan in Shaanxi Province of China (2016JQ6032).


  • Fiber optics components
  • Fiber Bragg gratings;
  • Fiber optics sensors


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