DISPERSION COMPENSATION OPTICAL FIBER AND OPTICAL TRANSMISSION LINE COMPRISING THE DISPERSION COMPENSATION OPTICAL FIBER

摘要

A dispersion compensation optical fiber having a small dispersion in the 1.5 νm and 1.3 νm bands. A first side core (2), a second side core (3), and a clad (5) are provided in this order on the outer periphery of a center core (1). The relationship among the relative refractive-index difference Δ1 of the center core (1) to the clad (5), the relative refractive-index difference Δ2 of the first side core (2) to the clad (5), and the relative refractive-index difference Δ3 of the second side core (3) to the clad (5) is expressed by Δ1⊃Δ3⊃Δ2, 0. 8%≤$s(D)1.3%, -0.5≤2/$s(D)1≤-0.35, 0.2% ≤ $s(D) 3 ≤ 0.3%. The continued ratio of diameter between the center core (1) and the first and second side cores (2, 3) is (1:2 to 2.5) : (2.5 to 3.5). The dispersion compensation optical fiber is connected to a single-mode optical fiber. The dispersion of the optical fiber after the connection in the 1.5 $s(m)m wavelength band is -1 to 1 ps / nm / km, and that in the 1.3 $s(m)m wavelength band is -5 to 5 ps / nm / km. An optical transmission line comprising such a dispersion compensation optical fiber is also disclosed.