Optical fiber cable, a method of branching optical fiber cables

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber cable having excellent branching workability, and a method for branching the optical fiber cable.SOLUTION: An optical fiber cable 1 comprises a sheath 3, inclusions 5, coated optical fibers 7, tension members 9, protective barriers 13, a supporting wire 15, and the like. The inclusions 5 require a certain level of rigidity to surely transmit force to the whole of the coated optical fibers 7 from both sides via the inclusions 5 during manufacturing. For example, if the inclusions 5 are easily deformed to be squashed by pushing pressure of the sheath 3, they become cushion layers, and force applied from both sides of the coated optical fibers 7 decreases. Thus, irregularities may be caused in the alignment (array) of the coated optical fibers 7. Therefore, the inclusions 5 are formed by twisting a predetermined amount of yarn. The twisting amount of the yarn is preferably 10 times or more and 30 times or less per 1 m.