Optical fiber tape core
AssigneeSumitomo Electric Industries, Ltd.
InventorsKaoru Okuno, Tomoyuki Hattori
Life of this patent
Estimating the term…
Abstract
In an optical fiber ribbon 1 according to the present invention, four optical fibers 10, 20, 30 and 40 are arranged in parallel to each other in a plane, a part of the periphery of these four optical fibers is covered with a ribbon matrix 51, but no rest thereof is covered with the ribbon matrix. First areas covered with the ribbon matrix 51 and second areas uncovered with the ribbon matrix alternate with each other along the longitudinal direction thereof. Alternatively, the optical fiber ribbon 1 is covered with the ribbon matrix over its entire length. In the glass section of each optical fibers, the mode field diameter defined by the definition of Petermann-I at a wavelength of 1.55 μm is 8 μm or less, and the cable cutoff wavelength is 1.26 μm or less.
Claims14
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.
Dependencies are inferred from the claim text.