Patent ID: 8639077

Claim:
A colored coated optical fiber comprising: a glass optical fiber; a primary coating layer covering the glass optical fiber; a secondary coating layer covering the primary coating layer; and a colored layer covering the secondary coating layer, wherein a ratio of a thermal expansion coefficient of a laminate including the secondary coating layer and the colored layer covering the secondary coating layer to that of the secondary coating layer is 0.98 or more and 1.03 or less, and a ratio of a glass transition temperature based on a dynamic viscoelasticity within a temperature range from −100° C. to 150° C. of the laminate to that of the secondary coating layer is 0.96 or more and 1.03 or less; wherein the secondary layer includes a photoinitiator having one of an alkylphenone-based photopolymerization initiator and an acylphosphine oxide-based photopolymerization initiator.