Patent ID: 7116872

Claim:
An optical fiber ribbon comprising a plurality of optical fibers that are arranged parallel to each other on a disposition plane and are covered with a ribbon matrix: wherein: in each of said optical fibers, the mode field diameter defined by the definition of Petermann-1 at a wavelength of 1.55 μm is 8 μm or less, and the cable cutoff wavelength is 1.26 μm or less; in each of said optical fibers, the bending loss in case of a bending diameter of 15 mm at a wavelength of 1.55 μm is 0.1 dB/turn or less; the absolute value of the wavelength dispersion in each of said optical fibers each at a wavelength of 1.3 μm and at a wavelength of 1.55 μm is 12 ps/nm/km or less; when separating one of said optical fibers from said optical fiber ribbon at a midway position in the longitudinal direction of said optical fiber ribbon, increase in an amount of the transmission loss of this optical fiber at a wavelength of 1.55 μm is 1.0 dB or less; the thickness of each of said optical fibers in the direction perpendicular to said disposition plane is less than 155 μm; and each of said optical fibers is covered with a pigmented layer, and adhesion force between said pigmented layer and said ribbon matrix in a 180° peel test is 0.4–5.0 g/cm.