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Writing Bragg Gratings in Multicore Fibers
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Overlap Spectrum Fiber Bragg Grating Sensor Based on Light Power Demodulation.

Hao Zhang1, Junzhen Jiang2, Shuang Liu3

  • 1Department of Electronic Information Science, Fujian Jiangxia University, Fuzhou 350007, China. dream13027@sina.com.

Sensors (Basel, Switzerland)
|May 19, 2018
PubMed
Summary

This study introduces a novel fiber Bragg grating (FBG) sensor using overlapping spectra for efficient light power demodulation. This method offers a linear and accurate approach for sensing applications, overcoming demodulation bottlenecks.

Keywords:
demodulationfiber Bragg gratingoverlap spectrumtemperature sensors

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Demodulation presents a significant challenge for fiber Bragg grating (FBG) applications.
  • Existing FBG sensing methods often face limitations in demodulation efficiency and accuracy.

Purpose of the Study:

  • To present a novel overlap spectrum FBG sensor.
  • To introduce a light power demodulation method for FBGs.
  • To demonstrate the sensor's effectiveness in measuring physical parameters.

Main Methods:

  • Utilizing two chirp FBGs (cFBGs) with partially overlapping reflection spectra.
  • Relating variations in the overlap spectrum's light power to changes in the measurand.
  • Implementing a temperature experiment to validate the sensor's performance.

Main Results:

  • The developed FBG sensor successfully linked light power variation in the overlap spectrum to measurand changes.
  • Experimental results demonstrated good linearity between the overlap power spectrum and temperature.
  • The sensor's performance aligned well with theoretical predictions.

Conclusions:

  • The proposed overlap spectrum FBG sensor offers an efficient and accurate demodulation method.
  • This technique effectively overcomes the demodulation bottleneck in FBG applications.
  • The sensor shows promise for various sensing applications requiring precise measurements.