Mode control in a multimode fiber amplifier based on gain-loss-management
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College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Corresponding author:
FENG Ying, csfenying@sina.com
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Received Date:
2008-10-16
Accepted Date:
2008-12-24
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Abstract
In order to optimize the output beam quality of a multimode fiber amplifier,a novel mode control method, gain-loss-management (GLM), was proposed. The mode discrimination for optimized gain distribution and additionally incorporated loss distribution was analyzed. The effect of the various dopant profiles was discussed, and the method to design GLM fiber was obtained. The results show that GLM method can efficiently suppress the power of higher-order modes in multimode cores and the output percentage of the fundamental mode can exceed 90%.
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