Patent ID: 7123803
Filing Date: 2006-10-17
Classification: G02B,H04B

Abstract:
1. An optical fiber, comprising a core and cladding, characterized by: a dispersion “D” of not less than 2 ps/nm/km and not more than 8 ps/nm/km(2≦D≦8), and a difference between the maximum and minimum dispersions of not more than 4 ps/nm/km over a wavelength range of 1460 to 1625 nm, at least four layers formed coaxially inside of the cladding having a reference refractive index, one of two adjacent layers differ in refractive index from the other, a refractive index profile of said layers is segment-core type, a first, second, third and fourth layers from the center to outside have relative refractive index differences of Δ1, Δ2, Δ3, and Δ4 with said reference refractive index of said cladding, respectively, and satisfy the following condition, Δ1>Δ4>Δ3>Δ2.