Hybrid tilted fiber grating based refractive index and liquid level sensing system

Zhijun Yan, Chengbo Mou, Zhongyuan Sun, Kaiming Zhou, Hushan Wang, Yishan Wang, Wei Zhao, Lin Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report a refractive index (RI) and liquid level sensing system based on a hybrid grating structure comprising of a 45° and an 81° tilted fiber gratings (TFGs) that have been inscribed into a single mode fiber in series. In this structure, the 45°-TFG is used as a polarizer to filter out the transverse electric (TE) component and enable the 81°-TFG operating at single polarization for RI and level sensing. The experiment results show a lower temperature cross-sensitivity, only about 7.33 pm/°C, and a higher RI sensitivity, being around 180 nm/RIU at RI=1.345 and 926 nm/RIU at RI=1.412 region, which are significantly improved in comparison with long period fiber gratings. The hybrid grating structure has also been applied as a liquid level sensor, showing 3.06 dB/mm linear peak ratio sensitivity.

Original languageEnglish
Pages (from-to)144-148
Number of pages5
JournalOptics Communications
Early online date24 Apr 2015
Publication statusPublished - 15 May 2015

Bibliographical note

© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/


  • liquid level sensor
  • polarization
  • refractive index sensor
  • tilted fiber grating


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