Patent ID: 6600862
Filing Date: 2003-07-29
Classification: G02B

Abstract:
An optical fiber which has a dispersion value at a 1.55 &mgr;m-wavelength band, of 6 to 24 ps/nm/km, and satisfies A>3Ã—D+40, where D represents a dispersion value (ps/nm/km) at a central wavelength of a 1.55 &mgr;m-wavelength band, and A represents an effective core area (&mgr;m2), wherein the optical fiber comprises a center core, a side core and a clad in order from an inner side, and has a refractive index profile of a two-layer core type, and which satisfies 0.2%&lE;&Dgr;&lE;0.35% and âˆ’0.3%&lE;&Dgr;2<0 where &Dgr;1 is a relative refractive index difference of the center core, with reference to the refractive index of the clad, and &Dgr;2 is a relative refractive index difference of the side core, with reference to the refractive index of the clad, and satisfies 0.3&lE;a/b&lE;0.7 where a represents an outer diameter of the center core and b represents an outer diameter of the side core.