Patent ID: 6556755
Filing Date: 2003-04-29
Classification: G02B

Abstract:
A dispersion-equalizing optical fiber constituting a part of an optical transmission line;wherein said dispersion-equalizing optical fiber comprises a core extending along a predetermined axis, an outer cladding provided on the outer periphery of said core, and a depressed region provided between said core and said outer cladding; wherein said dispersion-equalizing optical fiber has a dispersion D (unit: ps/nm/km) and a dispersion slope S (unit: ps/nm2/km) satisfying the following conditions: âˆ’57&lE;D&lE;âˆ’28.5 0.0050Ã—D&lE;S&lE;0.0025Ã—D at a wavelength of 1.55 &mgr;m;wherein said dispersion-equalizing optical fiber has, at the wavelength of 1.55 &mgr;m, an effective area of 15 &mgr;m2 or more, and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm; wherein said depressed region has a refractive index lower than those of both said core and said outer cladding; and wherein a ratio Ra of an outer diameter of said core with respect to that of said depressed region is greater than 0.4.