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Related Experiment Video

Updated: Feb 27, 2026

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Performance Optimization Design for a High-Speed Weak FBG Interrogation System Based on DFB Laser.

Yiqiang Yao1, Zhengying Li2,3, Yiming Wang4

  • 1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. yqyao@whut.edu.cn.

Sensors (Basel, Switzerland)
|June 23, 2017
PubMed
Summary

A novel waveform repairing algorithm enhances high-speed fiber Bragg grating (FBG) sensing systems. This method extends the dynamic demodulation range by 40%, enabling high-capacity sensing with identical weak FBGs.

Keywords:
distributed feedback laserhigh speedoptical fiber sensingweak fiber Bragg grating

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Area of Science:

  • Optoelectronics and Photonics
  • Sensor Technology
  • Signal Processing

Background:

  • High-speed interrogation of fiber Bragg gratings (FBGs) is crucial for advanced sensing applications.
  • Existing systems face limitations in multiplexing capacity and dynamic demodulation range.
  • Distributed feedback (DFB) swept lasers offer potential for high-speed FBG interrogation.

Purpose of the Study:

  • To propose a performance optimization design for a high-speed FBG interrogation system.
  • To enhance the multiplexing capacity of time-division-multiplexing sensor networks using identical weak FBGs.
  • To extend the dynamic demodulation range of FBG sensors through a waveform repairing algorithm.

Main Methods:

  • Implementation of a high-speed DFB swept laser.
  • Constitution of a time-division-multiplexing sensor network with identical weak FBGs.
  • Development and application of a waveform repairing algorithm based on spectral stability for distorted FBG spectra.

Main Results:

  • Successful distinction and demodulation of all identical weak FBGs at a speed of 100 kHz.
  • Achieved linearity of demodulation above 0.99.
  • Extended the dynamic demodulation range by 40%.

Conclusions:

  • The proposed system design and waveform repairing algorithm significantly improve FBG sensing performance.
  • High-capacity sensing with enhanced dynamic range is achievable using identical weak FBGs.
  • The method offers a practical solution for high-speed, high-density FBG sensor networks.