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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

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