| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical cable which can lessen structural distortion without drastically limiting the degree of freedom in designing an optical cable. SOLUTION: The optical cable 1 has a coated fiber ribbon stack 15 formed by laminating four sheets of 12-fibere ribbon-like coated optical fibers 13, polypropylene(PP) yarn 21 and 23, and a cylindrical sheath 31 for housing the coated fiber ribbon stack 15 and the PP yarn 21 and 23. Two pieces of the PP yarn 21 are arranged along the central axis O of the cylindrical sheath 31 in the central part of the cylindrical sheath 31. The coated fiber ribbon stack 15 is twisted together with eight pieces of the PP yarn 23 to the circumferences of the PP yarn 21 arranged along the central axis O of the cylindrical sheath 31 in the same direction and at the same pitch, by which the coated fiber ribbon stack is eventually twisted around the central axis O of the cylindrical sheath 31 in the state that the central axis P of the coated fiber ribbon stack 15 is offcentered from the central axis (the central axis O of the cylindrical sheath 31) of the twisting of the coated fiber ribbon stack 15.
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