Simulation of Fabry-Perot strain sensor based on tapered fiber Bragg grating

HAO Zijian; PU Shengli; LI Yongxi; LI Dihui; HAN Zhongxue

doi:10.5768/JAO202041.0508002

Journal of Applied Optics > 2020 > 41(5): 1129-1136. > DOI: 10.5768/JAO202041.0508002

HAO Zijian, PU Shengli, LI Yongxi, LI Dihui, HAN Zhongxue. Simulation of Fabry-Perot strain sensor based on tapered fiber Bragg grating[J]. Journal of Applied Optics, 2020, 41(5): 1129-1136. DOI: 10.5768/JAO202041.0508002

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Simulation of Fabry-Perot strain sensor based on tapered fiber Bragg grating

1.
College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
2.
Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China

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Received Date: March 09, 2020
Revised Date: April 10, 2020
Available Online: July 15, 2020

Graphical Abstract

Abstract

Abstract

In order to solve the problems of small free spectrum range or low interference fringe fineness, a strain sensing structure and its improved scheme of Fabry-Perot cavity based on single tapered fiber Bragg grating was proposed. By utilizing the characteristic of reflecting different wavelengths at different positions of the chirped fiber Bragg grating, the Fabry-Perot cavity was formed with a continuous variation of cavity length with wavelength, and the infinitely-great free spectrum range as well as the high resonance valley fineness was obtained. Numerical results show that the strain sensing sensitivity is positively related with the lumbar region diameter and grating region length of tapered fiber. In the range of 0~300 με, the strain sensing sensitivity is obtained to be 7.05 pm/με when the lumbar region diameter is 3/25 of the fiber diameter and the grating region length is 30 mm. The results have some reference value for the design of other interferometric sensing structures.
- tapered Bragg grating,
- Fabry-Perot cavity,
- free spectrum range,
- strain sensing,
- chirped Bragg grating

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References

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Simulation of Fabry-Perot strain sensor based on tapered fiber Bragg grating