MANUFACTURE OF COVERED OPTICAL FIBER

摘要

PURPOSE:To obtain a covered optical fiber having high adhesive strength between resin layers and superior resistance to lateral pressure by coating a semicured layer of a soft curable resin formed around an optical fiber with an uncured rigid curable resin and by completely curing both the resins. CONSTITUTION:A quartz preform rod 8 is spun into an optical fiber 2 in a spinning apparatus 7 composed of a rod feeder 5 and a spinning furnace 6. The fiber 2 is coated with an uncured soft curable resin by passing through a die type coater 9, and the resin is cured to a semicured state in a curing oven 10. The fiber 2 is then passed through a coater 11 to coat the semicured layer with an uncured rigid curable resin, and both the resins are completely cured in a curing oven 12 to obtain a covered optical fiber 1 having a buffer layer 3 of the soft resin and a protective layer 4 of the rigid resin formed successively around the optical fiber 2. The fiber 1 is wound around a bobbin 14 through a capstan 13.