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  • Received: Apr. 8, 2020

    Accepted: Apr. 30, 2020

    Posted: Jun. 12, 2020

    Published Online: Jun. 15, 2020

    The Author Email: Xiangfei Chen (

    DOI: 10.3788/COL202018.071201

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    Pan Dai, Yu Zhou, Leilei Wang, Shangjing Liu, Xuping Zhang, Xiangfei Chen. Demodulation of the multi-peak fiber Bragg grating sensor based on partial wavelength scan[J]. Chinese Optics Letters, 2020, 18(7): 071201

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Chinese Optics Letters, Vol. 18, Issue 7, 071201 (2020)

Demodulation of the multi-peak fiber Bragg grating sensor based on partial wavelength scan

Pan Dai1,2, Yu Zhou1,2, Leilei Wang1,2, Shangjing Liu1,2, Xuping Zhang1,2, and Xiangfei Chen1,2,*

Author Affiliations

  • 1Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education, Institute of Optical Communication Engineering, Nanjing University, Nanjing 210093, China
  • 2National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China


Until now, a high-efficiency demodulation method for fiber Bragg grating (FBG) sensors has been a challenge. In this Letter, by employing multi-peak FBGs, an FBG sensor with a partial wavelength scan is proposed and initially demonstrated. By demodulating a near-symmetrical multi-peak FBG and an asymmetrical multi-peak FBG in the strain experiment, sensor sensitivities of 1.02 pm/με and 1.01 pm/με are measured for the interrogation system, respectively. The average demodulation deviations for the two sensors are 1.81% and 0.4%, respectively. The proposed method is expected to realize high-efficiency and low-cost FBG interrogators.


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