An all-fiber few mode erbium doped fiber amplifier (FM-EDFA) with low differential modal
gain (DMG) is theoretically and experimentally demonstrated. Firstly, a double-cladding six …

We report a numerical investigation on a trench-assisted few-mode erbium-doped fiber
amplifier supporting 6 spatial modes with a very low differential modal gain. The numerical …

All-fiber orbital angular momentum (OAM) amplifier with high purity and broadband
spectrum gain based on a fused taper vortex-beam coupler (VBC) has been studied. Active …

A ring-core few-mode erbium-doped fiber (FM-EDF) with step refractive index is designed
and proposed to realize the modal gain equalization of the amplifier. The layered-doping …

A few-mode erbium-doped fiber (FM-EDF) with a step refractive index and trench structure is
designed and proposed to realize the modal gain equalization of a few-mode erbium-doped …

Space division multiplexing technology based on few-mode fiber (FMF) and multi-core fiber
is considered to be one of the most important technologies to greatly improve the data …