The differential modal gain (DMG) in a few‐mode erbium‐doped fibre amplifier (FM‐EDFA) is successfully improved by employing a ring‐core FM erbium‐doped fibre (RC‐EDF). The DMGs between LP 01 and LP 11 mode signals in the FM‐EDFA with the RC‐EDF are 1.8 and 1.6 dB for LP 01 and LP 11 mode pumping, respectively, whereas those in a FM‐EDFA with a conventional step‐index FM EDF are 9.2 and 6.1 dB, indicating 7.4 and 4.5 dB DMG improvement for LP 01 and LP 11 mode pumping, respectively.
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Ono et al. (2015) studied this question.
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