Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Sensing Characteristics of Uncoated Double Cladding Long-period Fiber Grating Based on Mode Transition and Dual-peak Resonance

  • Zhou, Yuan (Laboratory of Photo-electric Functional Films, College of Science, University of Shanghai for Science and Technology) ;
  • Gu, Zheng Tian (Laboratory of Photo-electric Functional Films, College of Science, University of Shanghai for Science and Technology) ;
  • Ling, Qiang (Hangzhou Institute of Advanced Studies, Zhejiang Normal University)
  • Received : 2020.11.29
  • Accepted : 2021.03.30
  • Published : 2021.06.25
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Abstract

In this paper, the sensing characteristics of a double cladding fiber (DCF) long-period fiber grating (LPFG) to the surrounding refractive index (SRI) are studied. The outer cladding of the DCF plays the role of the overlay, thus, the mode transition (MT) phenomenon of DCF can be induced by etching the outer cladding radius instead of coating overlays. The response characteristics of the effective refractive index (ERI) of the cladding mode to the outer cladding radius are analyzed. It is found that in the MT range, the change rate of ERIs of cladding modes is relatively larger than that for other ranges. Further, based on the features of the mode transition region (MTR), the phase-matching curve of the 11th cladding mode is investigated, and the response of the DCF-LPFG to the SRI is characterized by the change of wavelength intervals between the dual peaks under different outer cladding radii. The numerical simulation results show that the SRI sensitivity is greatly improved, which is available to 3484.0 nm/RIU with the fitting degree 0.998 in the SRI range of 1.33-1.37. The proposed DCF-LPFG can provide new theoretical support for designing the DCF-LPFG refractive index sensor with excellent performances of sensitivity, linearity and structure.

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References

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