This paper reviews a novel approach of implementing space-division multiplexing (SDM) based on Multi-element Fiber (MEF) technology. The MEF geometry provides for ultra-low crosstalk between the spatial channels while full compatibility with standard WDM components is maintained. Passive Ge-doped 3-MEFs have been fabricated and characterized and error free WDM data transfer at an aggregate rate of 1014 Gbit/s shown. Also, an Er/Yb-doped cladding-pumped 5-MEF has been demonstrated which enables pump sharing between the signal fiber-elements thereby reducing the number of components in the system. Both these passive and active MEFs have been used to demonstrate an error free SDM system with in-line amplification.
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