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Investigation of multipass Yb-doped fiber amplifiers

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Abstract

We investigated both numerically and experimentally single-pass, two-pass, and four-pass Yb-doped core-pumped fiber amplifier configurations and compared their performance with respect to achievable pump-to-signal conversion efficiency. Despite numerical calculations predicting the highest efficiency in the four-pass setup, an experimentally highest conversion efficiency of 77% was achieved in the two-pass setup and only 49% in the four-pass setup. Reduced performance of the experimental four-pass fiber amplifier configuration was caused by excess coupling losses, which do not impose a fundamental limitation. At the same time, the four-pass fiber amplifier configuration demonstrated advantageous characteristics of high gain using shorter length of active fiber and lower noise figure compared with other tested configurations.

© 2021 Optical Society of America

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Supplementary Material (1)

NameDescription
Supplement 1       Description of numerical model

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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