| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber built-in insulator which is easy to form, whose structure is simple, and whose manufacturing cost can be reduced, even if the inner core made by FRP where an optical fiber is built in becomes elongated. SOLUTION: In the optical fiber built-in insulator, in which the optical fiber 1 is built, the inner core 3 made by FRP is composed of the divided-type cylindrical body 5, where plural segments 7, 7 having an arch-shaped cross-sectional face whose inner and outer faces are curved outward in the width direction are combined into cylindrical form, and in a cylindrical hole 6 of the divided- type cylindrical body 5, an organic insulating material 11 is filled, and the optical fiber 1 incorporated into the cylindrical hole 6 is fixed.
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