A novel method of evaluating large mode area fiber design by brightness factor*
Zhang Hai-Taoa)†, Chen Danb), Ren Hai-Cuia), Yan Pinga), Gong Ma-Lia)‡
       
(a) Effective MFD and M 2 and (b) propagation loss and optical–optical conversion efficiency versus d / Γ of the FM with d core = 51 μm.