High power Er3+/Yb3+ co-doped fiber amplifiers with optimum fiber length
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Corresponding author:
WANG Ji, jiji_wang@163.com
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Received Date:
2009-12-15
Accepted Date:
2010-04-14
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Abstract
In order to investigate 1555nm high power fiber amplifiers with different gain length,a two-stage hybrid structure was employed,in which an erbium-doped fiber amplifier(EDFA) was used as a pre-amplifier for signal amplification and higher signal-noise ratio and an erbium/ytterbium co-doped double-cladding fiber amplifier (EYCDFA) was used as a master amplifier. The EYCDFA with special double-cladding configuration can couple more pump power into the system.The optimal,length of erbium-ytterbium co-doped fiber was investigated experimentally and analyzed theoretically.Under the conditions of 10mW signal power,318.58mW EDFA pump power,11.71W EYCDFA pump power and 14m gain length,2.11W output power was achieved.Amplified spontaneous emission spectrum appeared in L-band because of the over long gain fiber.It shows that there exists an optimal length at certain pump power and signal power,and the result is good for the study of high-power fiber amplifiers.
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