Numerical and experimental analysis of sensitivity-enhanced RI sensor based on Ex-TFG in thin cladding fiber

Zhijun Yan, Zhongyuan Sun, Kaiming Zhou, Binbin Luo, Jianfeng Li, Hushan Wang, Yishan Wang, Wei Zhao, Lin Zhang

Research output: Contribution to journalArticlepeer-review


We report a highly sensitive refractive index (RI) sensor in the aqueous solution, which is based on an 81°-tilted fiber grating structure inscribed into a thin cladding fiber with 40 μm cladding radius. The numerical analysis has indicated that the RI sensitivity of cladding resonance mode of the grating can be significantly enhanced with reducing cladding size. This has been proved by the experimental results as the RI sensitivities of TM and TE resonance peaks in the index region of 1.345 have been increased to 1180 nm/RIU and 1150 nm/RIU, respectively, from only 200 and 170 nm/RIU for the same grating structure inscribed in standard telecom fiber with 62.5-μm cladding radius. Although the temperature sensitivity has also increased, the change in temperature sensitivity is still insignificant in comparison with RI sensitivity enhancement.

Original languageEnglish
Pages (from-to)3023-3027
Number of pages5
JournalJournal of Lightwave Technology
Issue number14
Early online date20 Apr 2015
Publication statusPublished - 20 Apr 2015

Bibliographical note

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Funding: European Union 7th Framework Programme [FP7/2007−2013] under Grant 295208.


  • refractive index sensing
  • sensitivity
  • tilted fiber grating


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