We propose a design of orbital angular momentum (OAM) Erbium doped fiber amplifier (OAM-EDFA) supporting 22 modes with 18 OAM ones. Numerical simulation suggests that differential modal gain (DMG) of the optimum design is lower than 0.28 dB with mode-dependent gain (MDG) over 20 dB at C-band.

© 2015 Optical Society of America

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