| 摘要 |
An optical fiber comprising: a glass core extending from a centerline to a radius R1; a glass cladding surrounding and in contact with the core, the cladding comprising: a first annular region extending from R1 to a radius R2, the first annular region comprising a radial width, W2=R2-R1, a second annular region extending from R2 to a radius R3, the second annular region comprising a radial width, W3=R3-R2, and a third annular region extending from R3 to an outermost glass radius R4; wherein (i) the core comprises a maximum relative refractive index, Delta1MAX, relative to the third annular region; (ii) wherein the first annular region comprises a radial width W2; and (iii) the second annular region comprises a minimum relative refractive index, Delta3MIN, relative to the third annular region wherein Delta1MAX>Delta2MAX>Delta3MIN, and Delta2MIN>Delta3MIN; and the core and the cladding provide a fiber with cable cutoff less than 1500 nm, dispersion at 1550 nm less than 12 ps/nm/km, effective area at 1550 nm greater than 60 mum2, and preferably greater than 70 mum2. The second annular cladding region may contain a plurality of randomly dispersed holes.
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