An original concept of a Few-Mode Erbium Doped Fibre Amplifier (FMEDFA) based on a dual-concentric-core Erbium Doped Fibre (EDF) and paired mode converters is proposed for amplification of the LP11 and LP21 mode groups at 1530-nm wavelength with controlled Differential Modal Gain (DMG). As a proof of concept, we propose an EDF scheme that amplifies eight modes (including two polarizations and two orientations) of two mode-groups LP11 and LP21 input from a Few-Mode Fibre (FMF), with more than 20 dB of gain each. This concept is scalable to more mode groups and interesting for Mode Division Multiplexing (MDM).

© 2015 IEEE

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