COATED OPTICAL FIBER, OPTICAL FIBER TAPE CORE USING IT AND OPTICAL FIBER UNIT

摘要

The present invention provides a coated optical fiber in which a silica type optical fiber is coated with n layers (n being an integer of 2 or greater) of UV-curable resin, wherein the sum of respective contraction stress indices FI defined in the n layers of UV-curable resin by the following expression: FI ÄNÜ = (Young's modulus ÄMPaÜ of the UV-curable resin layer at -40 DEG C) x (cross-sectional area Ämm2Ü of the UV-curable resin layer) x (effective linear expansion coefficient Ä10-6/ DEG CÜ/106) x (temperature difference 190Ä DEG CÜ) is 3 ÄNÜ or less. The present invention can sufficiently prevent transmission characteristics from deteriorating in a low temperature environment. IMAGE