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Fiber Bragg grating location by a side-scatter technique based on cladding-mode coupling.

Robert R Maier1, James S Barton, Julian D Jones

  • 1School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom. r.r.j.maier@hw.ac.uk

Applied Optics
|June 9, 2004
PubMed
Summary

Side-scattered radiation from fiber Bragg gratings can reveal their position. This phenomenon, observed at specific wavelengths, aligns with theoretical models of mode coupling.

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Area of Science:

  • Optical Engineering
  • Fiber Optics
  • Photonics

Background:

  • Fiber Bragg gratings (FBGs) are crucial optical components.
  • Understanding light interaction with FBGs is essential for device characterization.

Purpose of the Study:

  • To experimentally investigate side-scattered radiation from FBGs.
  • To analyze the axial and angular properties of this scattered light.
  • To assess the potential of side-scattering for FBG localization.

Main Methods:

  • Experimental measurements on a fiber Bragg grating under broadband illumination.
  • Characterization of the axial variation and angular distribution of side-scattered radiation.
  • Comparison of experimental spectra with theoretical models.

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Main Results:

  • Observed coupling of radiation into cladding and radiation modes at specific wavelengths.
  • Demonstrated that the scattering signal can locate the grating position.
  • Confirmed the spectrum of scattered radiation is consistent with theoretical predictions.

Conclusions:

  • Side-scattering provides a method for locating fiber Bragg gratings.
  • The observed scattering is explained by mode coupling in finite cladding fibers.
  • Experimental results validate theoretical models of light interaction with FBGs.