Patent ID: 6785456
Filing Date: 2004-08-31
Classification: G02B,H04B

Abstract:
A hybrid optical fiber span, comprising:a first length of a first optical fiber comprising, at 1550 nm, positive dispersion greater than 10 ps/nm/km, an effective area greater than 85 &mgr;m2, and an attenuation less than 0.20 dB/km; and first length of a second optical fiber comprising, at 1550 nm, dispersion which is less than 10 ps/nm/km, an effective area less than that of the first fiber but greater than 25 &mgr;m2, and an attenuation less than or equal to 0.23 dB/km; both of the first and second fibers exhibiting positive dispersion slope at 1550 nm; wherein the lengths of the first and second fibers are selected so that the average attenuation of the span is less than 0.2 dB/km at 1550 nm.