Patent ID: 6804442
Filing Date: 2004-10-12
Classification: G02B

Abstract:
An optical fiber comprising:a fiber glass structure; a first jacket layer made of a soft curable resin and directly covering the external surface of said fiber glass structure; and a second jacket layer made of a rigid curable resin and covering the external surface of said fiber glass structure through said first jacket layer, wherein the mechanical factors of said fiber glass structure, the mechanical factors of said first jacket layer and the mechanical factors of said second jacket layer are selected in order that the Young's modulus of said first jacket layer is larger than the average tensile stress (&sgr;r+&sgr;&thgr;+&sgr;z)/3 as applied to said first jacket layer while a resin temperature of the curable resins falls from a temperature when the rigid curable resin starts hardening to a temperature when the hardening is finished.