STRUCTURE OF OPTICAL FIBER CABLE

摘要

PROBLEM TO BE SOLVED: To assure tensile force and shrinkage force without embedding a tension member into a sheath and to reduce the outside diameter of a cable by coating a laminate of coated optical fiber ribbons and a ribbon-like tension member with the sheath 4 in the state of twisting the laminate thereby forming the cable. SOLUTION: The ribbon-like rod (tension member) 13 made of FRP is arranged at a center and the 8-core coated optical fiber ribbons 12 are laminated in the state of holding the rod with three sheets each of the coated fiber ribbons. While the laminate is twisted at a prescribed pitch, the laminate is coated with the sheath 14 made of a polyethylene resin to a cable form, by which the optical fiber cable of 48 cores (six sheets of 8-core ribbons) is constituted. Padding may be put between the inside surface of the sheath 14 and the laminate of the coated fiber ribbons 12 and the ribbon-like rod 13. The ribbon-like rod 13 functions also as a resistor to the shrinkage force of the sheath 14.