| 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 mum; 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, Delta1MAX, relative to the third annular region, and wherein Delta1MAX is greater than about 0.1% and less than about 0.3%; the first annular region has a refractive index delta Delta2(r) is less than about 0.025%; wherein the second annular region comprises a minimum relative refractive index, Delta3MIN, relative to the third annular region; wherein Delta1MAX>Delta2MAX>Delta3MIN, and Delta2MIN>Delta3MIN<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 mum2 and bend loss of <=0.5 dB/turn on a 20 mm diameter mandrel.
|
