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Updated: Jun 11, 2026

Writing Bragg Gratings in Multicore Fibers
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Published on: April 20, 2016

Hybrid fiber grating cavity for multi-parametric sensing.

Domenico Paladino1, Giuseppe Quero, Christophe Caucheteur

  • 1Optoelectronic Division-Engineering Department, University of Sannio, C.so Garibaldi 107, 82100 Benevento, Italy

Optics Express
|July 1, 2010
PubMed
Summary

We developed a novel all-fiber interferometer using fiber Bragg gratings (FBGs) for simultaneous physical and chemical sensing. This robust sensor offers wavelength-gated reflection signals for enhanced detection capabilities.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Interferometry

Background:

  • Fiber Bragg gratings (FBGs) are widely used in optical sensing.
  • Tilted FBGs (TFBGs) enable cladding mode coupling for enhanced sensitivity.
  • Interferometric configurations offer high-resolution measurements.

Purpose of the Study:

  • To propose and demonstrate an all-fiber hybrid cavity interferometer.
  • To leverage TFBGs for wavelength-gated reflection and sensing.
  • To enable simultaneous physical and chemical sensing applications.

Main Methods:

  • Fabrication of an all-fiber interferometer using two unbalanced uniform FBGs and one TFBG.
  • Characterization of the wavelength-gated reflection signal and interference fringes.

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Last Updated: Jun 11, 2026

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  • Analysis of spectral dips caused by cladding mode coupling and optical losses.

    • Main Results:

    • The proposed hybrid cavity generates a wavelength-gated reflection signal.
    • Interference fringes are observed, modulated by cavity features and spectral dips.
    • The structure maintains the interrogation advantages of uniform FBGs.

    Conclusions:

    • The all-fiber hybrid cavity interferometer is a robust platform for sensing.
    • Simultaneous physical and chemical sensing is achievable with this configuration.
    • The TFBG-induced cladding mode coupling enhances sensing performance.