Design of Few-mode Erbium-doped Fiber Amplifiers with Tunable Differential Mode Gain

Abstract

The paper focuses on the tunability of DMG for FM-EDFAs, which helps to realize the zero DMG or compensate for the mode-dependent loss of fiber links. An optimal method is proposed to design the EDFAs with tunable DMG by sweeping the EDF’s length and the forward-to backward pump power ratio. The relevant experiment is also performed for tunable DMG.