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A Six-Mode Erbium-Doped Fiber Amplifier

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Abstract

We report and characterize an amplifier which provides gain to a record six spatial modes simultaneously. Two sections of erbium-doped fibre with different mode-dependent gain characteristics are concatenated to equalize gain between modes. The overall gain excursion does not exceed 4dB across all modes. The noise figure is found lower than 7dB.

© 2012 Optical Society of America

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