| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber cable in which a water-absorbing fiber layer, filled in the gap between a cable sheath and a cable core is formed at a low cost without spoiling its original function. SOLUTION: The water-absorbing fiber layer is formed out of water-absorbing fiber which has large water absorptivity and water-absorbing fiber which has small water absorptivity.
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