Patent ID: 8111964
Filing Date: 2012-02-07
Classification: C03C,G02B

Abstract:
1. An optical fiber comprising: a glass optical fiber including a core and a cladding; a buffer layer covering the glass optical fiber; and a hard layer covering the buffer layer, the hard layer being harder than the buffer layer, wherein the buffer layer includes: a Young's modulus of each of the primary and secondary protective layers is equal to or less than several MPa and a Young's modulus of the third protective layer is hundreds MPa or more, a glass transition temperature of the primary protective layer is made to be higher than −20° C. and 10° C. or lower, a glass transition temperature of the secondary protective layer is made to be −10° C. or lower, and the glass transition temperature of the primary protective layer is made higher than the glass transition temperature of the secondary protective layer.