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Bragg grating resonances in all-solid bandgap fibers.

Long Jin1, Zhi Wang, Qiang Fang

  • 1Key Laboratory of Opto-Electronic Information Science and Technology (Ministry of Education), Institute of Modern Optics, Nankai University, Tianjin, China. kingbay@gmail.com

Optics Letters
|September 18, 2007
PubMed
Summary

Researchers created Bragg gratings in photonic bandgap fibers, observing unique supermode resonance couplings. This method reveals insights into fiber grating behavior and bend response, crucial for optical sensing applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Bragg gratings are fundamental components in fiber optics.
  • Photonic bandgap fibers offer unique light-guiding properties.
  • Fabricating gratings in these fibers presents specific challenges.

Purpose of the Study:

  • To investigate the fabrication of Bragg gratings in all-solid photonic bandgap fibers.
  • To analyze the resulting resonance couplings and modal properties.
  • To understand the influence of asymmetric index profiles on grating behavior.

Main Methods:

  • Fabrication of Bragg gratings via longitudinal periodic index modulation in photonic bandgap fibers.
  • Utilizing side UV illumination to induce asymmetric index profiles.
  • Analyzing resonance couplings to LP(01) supermodes (high-index rod modes).

Main Results:

  • Observed resonance couplings to LP(01) supermodes, with peaks on the long-wavelength side of the Bragg wavelength.
  • The supermode resonance peak exhibited significant depth.
  • Asymmetric index profiles broadened supermode resonance peaks and affected bend response based on fiber orientation.

Conclusions:

  • The study demonstrates a method for fabricating Bragg gratings in photonic bandgap fibers.
  • Unique supermode resonance couplings were identified and characterized.
  • Asymmetric index modulation influences the spectral and bending properties of fiber gratings.