Optical fiber provided with reliable coating layers

• US 20090269015A1
• Filed: 07/28/2006
• Published: 10/29/2009
• Est. Priority Date: 07/28/2006
• Status: Active Grant

• Current Assignee: Furukawa Electric Company Limited
• Original Assignee: Furukawa Electric Company Limited
• Inventors: Tanaka, Hiroki, Nakajima, Yasuo, Arashitani, Yoshihiro, Ono, Takayoshi
• Granted Patent: US 7,729,564 B2
• Time in Patent Office: Days
• US Class Current: 385/128
• CPC Class Codes: C03C 25/106 Single coatings
• CPC Class Codes: C03C 25/1065 Multiple coatings
• CPC Class Codes: G02B 6/02395 Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104

Abstract

An optical fiber is provided, which is unlikely to cause interlayer delamination between a glass optical fiber and a primary coating layer even when it is immersed in water. The optical fiber of the present invention includes a glass optical fiber 1 consisting of a core and a cladding, a primary coating layer 2 overlaid on the glass optical fiber, and a secondary coating layer 3 overlaid on the primary coating layer, wherein the relaxation modulus of the secondary coating layer is set at 400 MPa or less.

Claims

1. An optical fiber comprising a glass optical fiber consisting of a core and a cladding, a primary coating layer overlaid on said glass optical fiber, and a secondary coating layer provided on said primary coating layer, characterized in that the relaxation modulus of said secondary coating layer is 400 MPa or less.

2. The optical fiber according to claim 1, characterized in that a silane coupling agent of 1.0 or more parts per hundred of resin is added to a resin used for the primary coating layer.