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Coupled local-mode theory for strongly modulated long period gratings

Coupled local-mode theory for strongly modulated long period gratings
Coupled local-mode theory for strongly modulated long period gratings
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.
0733-8724
1745-1751
Jin, Long
82fdd54e-158d-4ede-a9da-4e7d8bfa2690
Jin, Wei
ced7b68f-0cb0-4c24-9ccf-194e6c629256
Ju, Jian
c2d2fa03-15cf-4061-b661-adee88bc52b7
Wang, Yiping
3da133a6-980c-4622-9c63-4e691fc0cae1
Jin, Long
82fdd54e-158d-4ede-a9da-4e7d8bfa2690
Jin, Wei
ced7b68f-0cb0-4c24-9ccf-194e6c629256
Ju, Jian
c2d2fa03-15cf-4061-b661-adee88bc52b7
Wang, Yiping
3da133a6-980c-4622-9c63-4e691fc0cae1

Jin, Long, Jin, Wei, Ju, Jian and Wang, Yiping (2010) Coupled local-mode theory for strongly modulated long period gratings. IEEE 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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More information

e-pub ahead of print date: 6 May 2010
Published date: 15 June 2010
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 378491
URI: http://eprints.soton.ac.uk/id/eprint/378491
ISSN: 0733-8724
PURE UUID: c93d6b82-875f-4e12-a973-d7343ee90617

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Date deposited: 29 Jun 2015 13:59
Last modified: 04 Oct 2019 16:31

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Contributors

Author: Long Jin
Author: Wei Jin
Author: Jian Ju
Author: Yiping Wang

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