Patent ID: 6301419
Filing Date: 2001-10-09
Classification: G02B

Abstract:
An dispersion-equalizing optical fiber constituting a part of an optical transmission line;wherein said dispersion-equalizing optical fiber comprises a core region extending along a predetermined axis, and a cladding region provided on the outer periphery of said core region;wherein said dispersion-equalizing optical fiber has a dispersion D (unit: ps/nm/km) and a dispersion slope S (unit: ps/nm.sup.2 /km) satisfying the following conditions:-83.ltoreq.D.ltoreq.-180.0050.times.D.ltoreq.S.ltoreq.0.0025.times.Dat a wavelength of 1.55 um;wherein said dispersion-equalizing optical fiber has, at the wavelength of 1.55 um, an effective area of 15 um.sup.2 or more, and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm;wherein said cladding region comprises an inner cladding, provided on the outer periphery of said core region, having a lower refractive index than said core region; and an outer cladding, provided on the outer periphery of said inner cladding, having a higher refractive index than said inner cladding; andwherein a ratio Ra of an outer diameter of said core region with respect to that of said inner cladding is greater than 0.4.