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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 28, Iss. 12 — Jun. 15, 2010
  • pp: 1745–1751

Coupled Local-Mode Theory for Strongly Modulated Long Period Gratings

Long Jin, Wei Jin, Jian Ju, and Yiping Wang

Journal of Lightwave Technology, Vol. 28, Issue 12, pp. 1745-1751 (2010)

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A method for modeling the mode-coupling process in strongly modulated long period gratings (LPGs) is reported. The method is based on calculating the variations of local-mode profiles and propagation constants over the perturbed regions and solving the coupled local-mode equations to obtain a quantitative description of the intermodal energy exchange. The mode-coupling process and the spectral characteristics of a CO$_{2}$ laser-inscribed LPG in a photonic crystal fiber are numerically modeled and found in good agreement with the experimentally measured results. Compared with the methods based on the conventional coupled-mode and the mode-projection theories, the current method provides a more accurate description of the mode coupling process for LPGs with strong but slow-varying perturbations.

© 2010 IEEE

Long Jin, Wei Jin, Jian Ju, and Yiping Wang, "Coupled Local-Mode Theory for Strongly Modulated Long Period Gratings," J. Lightwave Technol. 28, 1745-1751 (2010)

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