M. Wada1, T. Sakamoto1, S. Aozasa1, T. Morii1, K. Nakajima1
1 NTT Access Network Service Systems Laboratories
European Conference on Optical Communication, M.2.A.4 (2016).
Abstract: We experimentally demonstrate a 10-mode fibre amplifier consisting of EDFs with a step-and-ring erbium concentration profile. We achieve a low differential modal gain below 3.5 dB and a low noise figure (4.5-7.0 dB) with a core-pumped configuration in the C-band.