Structured light, with spatially varying phase or polarization distributions, has given rise to
many novel applications in fields ranging from optical communication to laser-based …

Free-space optical (FSO) communication has gained much interest due to its capability of
providing not only a cost-efficient solution where the optical fiber is too expensive or too …

We propose a design of ring-core few-mode fiber (RC-FMF) with the erbium doping at the
cladding region near the outer ring edge. After the parameter optimization of the RC-FM …

We experimentally demonstrate a 12-mode group (21 spatial mode) cladding-pumped few-
mode erbium-doped fiber amplifier. The differential modal gain (DMG) is dramatically …

Recently optical amplification technologies for mode-division multiplexing (MDM)
transmission systems and networks have attracted great interest. In this article, we first …

Using the few-mode erbium-doped fiber (FM-EDF) with a simple two-layer erbium-doped
structure, we demonstrate an all-fiber FM-EDF amplifier. The gain equalization among the …

Mode division multiplexing (MDM) is considered to be an efficient solution to alleviate the
exponentially increasing “capacity crunch”. Here, we numerically and experimentally …

We numerically and experimentally demonstrated a low different modal gain (DMG) 5-LP
modes l-band fiber amplifier by using an extremely simple fiber structure. The effect of fiber …

The transmission capacity of optical fiber communication can be effectively improved by the
combination of dual-polarization (DP) high-order modulation format with mode division …

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 …