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Table 1 Fiber core glass compositions (wt%), Al/Er ratio (mol%), numerical aperture (NA), and core diameter (μm)

From: Benefit of Rare-Earth “Smart Doping” and Material Nanostructuring for the Next Generation of Er-Doped Fibers

Sample reference Process type Al content Ge content Al/Er NA Core diameter
NP035 Nano 0.35 23 30 0.27 4
NP100 Nano 1.00 3 50 0.2 idem
NP180 Nano 1.80 5 30 idem idem
NP350 Nano 3.50 3 200 idem idem
NP450 Nano 4.50 0.75 200 idem idem
ST035 Standard 0.35 25 57 0.27 idem
ST400 Standard 4.00 <0.5 444 0.2 idem
ST600 Standard 6.00 <0.5 800 0.27 idem