DISPERSION CONTROL FIBER AND OPTICAL TRANSMISSION LINE

PROBLEM TO BE SOLVED: To provide a dispersion control fiber which is suitable for high-density wavelength-division multiplex transmission in a wavelength band of 1,525 to 1,575 nm. SOLUTION: The absolute value of total dispersion Dt1550at a wavelength of 1,550 nm is ≥20 ps/nm, and total dispersion Dt1460at a wavelength of 1,460 nm, total dispersion Dt1625at a wavelength of 1,625 nm, and a total dispersion slope St1550at a wavelength 1,550 nm satisfy relational expressions (1) to (3) or relational expressions (4) to (6). Namely, when Dt1550≤-20 ps/nm, (1) Dt1460≥-117+0.01Dt1550, (2)Dt1625≥-292.5+0.025Dt1550, and (3) St1550≥Dt1550/90, or when Dt1550≥+20 ps/nm, (4) Dt1460≤153+0.1Dt1550, (5) Dt1625≤345-0.5Dt1550, and (6) St1550≤Dt1550/90. COPYRIGHT: (C)2007,JPO&INPIT