Mode-dependent gain characterization of erbium-doped multimode fiber using C2 imaging. - Haoshuo Chen; Bin Huang; Nicolas K. Fontaine; Roland Ryf; Juan Carlos Alvarado; Zahoora Sanjabi Eznaveh; Axel Schiilzgen; Pierre Sillard; Cedric Gonnet; Jose Enrique Antonio-Lopez; Guifang Li; Rodrigo Amezcua Correa (OFC, 2017)