%0 Journal Article %T Concentric layers with heterogeneous doping for cladding-pumped L-band fiber amplifiers %A Matte-Breton, C. %A Wang, L. %A Maes, F. %A Messaddeq, Y. %A LaRochelle, S. %J Proceedings of SPIE %V 12028 %P 1202802-1202802-8 %@ 0277-786X %D 2022-03-04 %I SPIE %~ DeepDyve