2000-fiber ultra-high density underground optical cable

A 2000-fiber cable has been developed which has twice the number of optical fibers with the same outer diameter as a conventional 1000-fiber underground optical cable. The structure is that four units of 2-fiber ribbons which use SM fibers of 15 mm-allowable bending radius are aligned in parallel and the adjacent two units of 2-fiber ribbons are adhered longitudinally at intervals. It has an 80-fiber unit structure where the ten units of the 8-fiber rollable optical fiber ribbons are tied in bunch by the cross-winding of two bundling materials and the unit is identified by the color combinations of the two bundling materials. Adhering the intersection points of the crosswinding of the bundling materials, its cohesion is enhanced and its handleability becomes improved. It has good performances in its transmission, its mechanical and its temperature characteristics.