| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a colored coated optical fiber having excellent hot water resistance and preferable low-temperature characteristic even if a tape material and an overcoated material having crystal components outside thereof are applied, and to provide an optical fiber ribbon and an optical fiber overcoated core using the colored coated optical fiber. <P>SOLUTION: The colored coated optical fiber 1 has a coating layer 3 including two layers of a primary coating layer 31 and a secondary coating layer 32, wherein the coating layer 3 with the two coating layers comprises an ultraviolet-cured resin containing polyether polyurethane having a polyoxyalkylene structure in which an alkyl group is in a side chain, free-volume radius of the secondary coating layer 32 determined by the positron annihilation method is 0.280 nm or smaller, and either the primary coating layer 31 or the secondary coating layer 32 is colored. <P>COPYRIGHT: (C)2013,JPO&INPIT |
