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Related Experiment Video

Updated: Aug 1, 2025

Writing Bragg Gratings in Multicore Fibers
08:48

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Femtosecond Inscription of a Fiber Bragg Grating Spectral Array in the Same Spatial Location.

Aviran Halstuch1, Amiel A Ishaaya1

  • 1School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.

Sensors (Basel, Switzerland)
|April 28, 2023
PubMed
Summary

A novel method fabricates a five fiber Bragg grating (FBG) array at a single location. This tunable FBG array demonstrates precise wavelength control for sensing applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science and Engineering

Background:

  • Fiber Bragg gratings (FBGs) are crucial optical sensing elements.
  • Multiplexing FBGs often requires complex inscription techniques or multiple inscription spots.

Purpose of the Study:

  • To develop a method for inscribing a multi-FBG array at the same physical location.
  • To investigate the spectral characteristics and tunability of the fabricated FBG array.
  • To assess the strain and temperature sensitivity of the FBG array.

Main Methods:

  • Utilized a femtosecond laser and a uniform phase mask (PM) for FBG inscription.
  • Employed a defocusing spherical lens and cylindrical focusing lens for precise control.
  • Achieved wavelength tunability by adjusting the defocusing lens and translating the PM for magnification control.
Keywords:
FBG fabricationphysical sensorsspecial fiber gratings

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Last Updated: Aug 1, 2025

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  • Inscribed a cascade of five FBGs at the identical spot through PM translation.

    • Main Results:

    • Successfully inscribed a five-FBG array at a single location.
    • Measured second-order Bragg wavelengths around 1.56 µm with an ~8 dB transmission dip.
    • Observed a ~2.9 nm spectral shift between consecutive FBGs, totaling ~11.7 nm.
    • Recorded third-order Bragg wavelengths near 1.04 µm with ~1.97 nm separation between adjacent FBGs.

    Conclusions:

    • Demonstrated a feasible method for creating densely packed FBG arrays.
    • The developed technique offers precise control over spectral characteristics and wavelength spacing.
    • The inscribed FBG array exhibits potential for advanced sensing applications requiring multiplexing.