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Related Experiment Video

Updated: Jun 7, 2025

Writing Bragg Gratings in Multicore Fibers
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Phase-Shifted Fiber Bragg Grating by Selective Pitch Slicing.

Paulo Robalinho1,2, Vinícius Piaia1, Liliana Soares1,2

  • 1INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, 4169-007 Porto, Portugal.

Sensors (Basel, Switzerland)
|November 9, 2024
PubMed
Summary

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Researchers developed a novel sliced Fiber Bragg Grating (SFBG) for vibration sensing. This new fiber optic sensor effectively detects vibrations across a wide frequency range, showing potential for structural monitoring applications.

Area of Science:

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

Background:

  • Standard Fiber Bragg Gratings (FBGs) are widely used but can be modified for enhanced functionality.
  • Phase-shifted FBGs offer unique optical properties for sensing applications.
  • Controlling phase shifts in gratings is crucial for advanced optical device design.

Purpose of the Study:

  • To introduce and characterize a novel phase-shifted Fiber Bragg Grating (FBG) called the sliced-FBG (SFBG).
  • To investigate the SFBG's performance as a vibration sensor.
  • To demonstrate the tunability of the phase shift by altering the grating's final pitch.

Main Methods:

  • Fabrication of SFBG by cutting a standard FBG within its grating region.
  • Characterization of the SFBG's optical output signal, resulting from the overlap of FBG reflection and fiber-cleaved tip reflection.
Keywords:
fabricationoptical fiber sensorphase-shift FBG

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  • Testing the SFBG as a vibration sensor within the frequency range of 150 Hz to 70 kHz.

    • Main Results:

    • Successful fabrication of the SFBG with a shorter last grating pitch.
    • Demonstration of the SFBG's capability to sense vibrations from 150 Hz to 70 kHz.
    • Confirmation that the phase shift in the SFBG can be controlled by adjusting the length of the last pitch.

    Conclusions:

    • The sliced-FBG (SFBG) is a viable new fiber optic device with dual functionality as a filter and a sensing element.
    • The SFBG demonstrates significant potential as a vibration sensor for monitoring mechanical structures.
    • The ability to control phase shifts offers flexibility for various optical sensing and filtering applications.