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Bend-Induced Distortion in Large Mode Area Holey Fibre |
TAN Xiao-Ling;GENG You-Fu;ZHANG Tie-Li;WANG Wei-Neng;WANG Peng;YAO
Jian-Quan |
| College of Precision Instrument and Optoelectronics Engineering, Institute of Laser and Optoelectronics, Tianjin University, Tianjin 300072Key Laboratory of Optoelectric Information Science and Technology of Ministry of Education, Tianjin University, Tianjin 300072 |
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| Cite this article: |
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TAN Xiao-Ling, GENG You-Fu, ZHANG Tie-Li et al 2008 Chin. Phys. Lett. 25 1661-1663 |
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Abstract A simplified scheme of bend-induced mode distortion is introduced into bent holey fibres, the distorted mode distribution and mode effective area reduction are investigated using the finite difference method. Numerical results show that the modes of bent holey fibres with small bend radius shift away from the core and are deformed greatly, and the mode areas drop significantly as the bend radius decreases, which severely affects the fibre laser performance. The propagation characteristics of bent holey fibres at
given wavelength are determined by fill factor and normalized bend radius. Finally, the transition normalized bend radius that represents the location of the mode area beginning to fall off is obtained.
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| Keywords:
41.20.Jb
42.81.Bm
42.81.Dp
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Received: 21 December 2007
Published: 29 April 2008
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| PACS: |
41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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42.81.Bm
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(Fabrication, cladding, and splicing)
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42.81.Dp
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(Propagation, scattering, and losses; solitons)
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