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Three-hole microstructured optical fiber for efficient fiber Bragg grating refractometer.

Minh Châu Phan Huy1, Guillaume Laffont, Véronique Dewynter

  • 1Comissariat à l'Energie Atomique LIST, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette Cedex, France.

Optics Letters
|August 19, 2007
PubMed
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Researchers developed a novel three-hole microstructured optical fiber sensor. This fiber Bragg grating (FBG) sensor shows a two-orders-of-magnitude improvement in refractive index sensitivity for sensing applications.

Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Fiber Optic Technology

Background:

  • Standard fiber Bragg gratings (FBGs) have limitations in refractive index sensitivity.
  • Microstructured optical fibers offer unique properties for enhanced sensing.
  • Ge-doped silica cores are suitable for photowriting gratings.

Purpose of the Study:

  • To design and fabricate a photosensitive three-hole microstructured optical fiber.
  • To improve the refractive index sensitivity of FBG sensors.
  • To investigate the spectral sensitivity of gratings in microstructured fibers.

Main Methods:

  • Photowriting fiber Bragg gratings in the core of a three-hole microstructured optical fiber.
  • Characterizing the spectral response of the FBG sensor.

Related Experiment Videos

  • Comparing the sensitivity of the novel sensor with standard FBG sensors in a six-hole fiber.

    • Main Results:

    • Achieved a two-orders-of-magnitude improvement in refractive index sensitivity.
    • Demonstrated a sensor resolution of 3 x 10(-5) at n=1.33 and 6 x 10(-6) at n=1.40.
    • Successfully photowrote gratings in the suspended Ge-doped silica core.

    Conclusions:

    • The three-hole microstructured optical fiber significantly enhances FBG sensor sensitivity.
    • This novel fiber design is promising for high-resolution refractive index sensing applications.
    • The photowriting technique is effective for fabricating gratings in such advanced fiber structures.