Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 36, Issue 11, Pages 2240-2247Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2018.2790434
Keywords
Dispersion turning point; etching; long period fiber grating; strain sensor
Funding
- Spanish Ministry of Economy and Competitiveness (AEI/FEDER, UE) [TEC2016-78047-R]
- Government of Navarra [PI044 NANOSEN]
- Pinar del Rio University
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Two phenomena for enhancing the sensitivity of long-period fiber gratings are combined toward an increase of the sensitivity to strain of this type of devices: the dispersion turning point (DTP) and the cladding diameter reduction by an etching process. The results prove that sensitivities up to 20 pm/mu epsilon can be attained, which is a ten-fold improvement compared to the previous works. The sensitivity in the grating region, which is subjected to etching, does not depend on the order of the cladding mode responsible for the attenuation bands generated in the transmission spectrum, but on the proximity to the DTP for each mode order. On the other hand, the sensitivity to strain of the global structure, including the region without etching, can be increased for lower order modes in a perceptible way if the length of the etched region is smaller compared to the fiber region under stress. The experimental results are supported with simulations based on coupled-mode theory and on FIMMWAVE, which allows understanding the phenomena involved during the sensing process.
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