Optical fiber and optical fiber ribbon

Abstract

An optical fiber comprising a glass fiber including a core and a cladding, a primary resin layer being in contact with the glass fiber and coating the glass fiber, a secondary resin layer coating the primary resin layer; and a colored resin layer coating the secondary resin layer. The colored resin layer includes a cured product of a resin composition containing a photopolymerizable compound, a photopolymerization initiator, a polydimethylsiloxane compound, and titanium oxide particles. A number of titanium-containing particle(s) having a diameter of 5 μm or more contained in the colored resin layer, is less than 15 per mm in a length direction of the colored resin layer. A content of silicon in a surface of the colored resin layer is 0.9 at % or more and 11 at % or less.

Dependencies are inferred from the claim text.