LARGE EFFECTIVE AREA FIBER

摘要

An optical fiber according to an embodiment of the present invention comprises: a glass core extending from a centerline to a radius R₁ wherein R₁ is greater than about 5 µm; a glass cladding surrounding and in contact with the core, the cladding comprising: (i) a first annular region extending from the radius R₁ to a radius R₂ the first annular region comprising a radial width, W₂ = R₂ - R₁, (ii) a second annular region extending from the radius R₂ to a radius R₃, and comprising a radial width, W₃ = R₃ - R₂, and (iii) a third annular region surrounding the second annular region and extending from the radius R₃ to an outermost glass radius R₄; wherein the core comprises a maximum relative refractive index, ?_1max, relative to the third annular region, and wherein ?_1MAX is greater than about 0.1 % and less than about 0.3 %; the first annular region has a refractive index delta ?₂(r) is less than about 0.025%; wherein the second annular region comprises a minimum relative refractive index, ?_3MIN, relative to the third annular region; wherein ?_1MAX > ?_2MAX > ?_3MIN, and ?_2MIN > ?_3MIN<0; and wherein the core and the cladding provide a fiber with cable cutoff less than 1500 nm, and an effective area at 1550 nm greater than 95 µm² and bend loss of ==0.5 dB/turn on a 20 mm diameter mandrel.