Analysis of lasing wavelengths for erbium-doped fiber ring lasers
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School of Computer and Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
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2.
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing400065, China
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Corresponding author:
WANG Lian, wanglian88@yahoo.com.cn
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Received Date:
2008-07-21
Accepted Date:
2008-11-10
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Abstract
In order to analyze the relationship among the lasing wavelength,length and coupler ratio of erbium-doped fibers, the rate equation based on 3rd energy state was solved and confirmed in experiments. The lasing wavelengths changing with the length and coupler ratio of erbium-doped fibers were obtained. The result shows that the lasing wavelength is shifted to longer wavelength with the decrease of the length of the erbium-doped fiber. The maximum output power occurs at 1563nm when the optimum length of the erbium-doped fiber is 11. 5m. In addition,the lasing wavelength becomes shorter wavelength with the decrease of the coupler ratio. These are good for the optimized design of a tunable erbium-doped fiber laser by varying coupler ratio.
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