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A temperature-insensitive cladding-etched Fiber Bragg grating using a liquid mixture with a negative thermo-optic

Kwang Taek Kim1, In Soo Kim, Cherl-Hee Lee

  • 1Department of Optoelectronics, Honam University, Gwangju 506-714, Korea.

Sensors (Basel, Switzerland)
|September 13, 2012
PubMed
Summary

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A novel fiber Bragg grating (FBG) design compensates for temperature changes. By immersing a specialized FBG in a glycerin-water mixture, its wavelength shift is stabilized, enhancing sensor accuracy.

Area of Science:

  • Optoelectronics and Photonics
  • Optical Fiber Sensors
  • Materials Science

Background:

  • Standard fiber Bragg gratings (FBGs) exhibit significant temperature dependency, limiting their precision in sensing applications.
  • The Bragg wavelength shift in conventional FBGs is directly correlated with ambient temperature fluctuations.
  • Developing methods to mitigate this temperature sensitivity is crucial for reliable optical sensing.

Purpose of the Study:

  • To investigate a cladding-etched FBG design for temperature compensation.
  • To evaluate the effectiveness of a liquid mixture with a negative thermo-optic coefficient in stabilizing FBG performance.
  • To determine the optimal composition of a glycerin-water mixture for near-complete temperature compensation.

Main Methods:

Keywords:
Fiber Bragg gratingcladding etchedcompensationnegative thermo-optic coefficienttemperature insensitive

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  • Fabrication of a cladding-etched fiber Bragg grating.
  • Immersion of the etched FBG in a liquid mixture of varying glycerin and water ratios.
  • Characterization of the Bragg wavelength shift in response to temperature changes for different mixture compositions.

    • Main Results:

    • The cladding-etched FBG immersed in the liquid mixture showed a Bragg wavelength shift opposite to that of a conventional FBG.
    • A mixture of 50% water and 50% glycerin, possessing a negative thermo-optic coefficient (-5 × 10⁻⁴ °C⁻¹), demonstrated significant temperature compensation.
    • The proposed method effectively minimized the temperature-dependent Bragg wavelength shift of the FBG.

    Conclusions:

    • A cladding-etched FBG combined with a specific glycerin-water mixture offers a viable solution for temperature-independent optical sensing.
    • This approach significantly enhances the stability and reliability of FBG-based sensors in variable temperature environments.
    • The study presents a practical method for compensating the thermal effects in FBGs using readily available materials.