Coupled local-mode theory for strongly modulated long period gratings

Jin, Long, Jin, Wei, Ju, Jian and Wang, Yiping (2010) Coupled local-mode theory for strongly modulated long period gratings. Journal of Lightwave Technology, 28 (12), 1745-1751. (doi:10.1109/JLT.2010.2049252).

Record type: Article

Abstract

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 CO₂ 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.

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