Y. Wakayama1, K. Igarashi1,2, D. Souma1, H. Taga1, T. Tsuritani1
1KDDI R&D Laboratories, 2Osaka University
European Conference on Optical Communication, M.2.A.3 (2016).
Abstract: We demonstrate a cladding-pumped six-mode fibre amplifier with a widely erbium-doped distribution over the core for uniform overlap between spatial modes and the gain medium. The differential modal gain of less than 3.3 dB was achieved in the entire -band.