FIBER AMPLIFIER OF DOUBLE COATING.

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Optical fiber amplifier includes mono-mode core with refractive index (n1), first cladding around core with refractive index (n2); further cladding around first cladding with refractive index (n3); and ring with refractive index (n4) doped with rare earth material surrounding core. First cladding shows partly radial refractive index (n2) as function of radius almost continuously decreasing.