Optical fiber and method for making such fiber

USRE44288E1 · kind E1 · reissue

Assignee

• CORNING INCORPORATED · US

Inventors

• Ronald L. Kimball · Corning, US
• Robert Arnold Knowlton · Wellsboro, US
• Joseph Edward McCarthy · Hornell, US
• Ji Wang · Corning, US
• Donnell Thaddeus Walton · Corning, US
• Luis Alberto Zenteno · Corning, US

Key dates

• Filing date: Jul 29, 2009
• Grant date: Jun 11, 2013
• Expiry date: Jul 29, 2029

Classification

• Technology area (CPC —): General

Abstract

According to one example of the invention an optical fiber comprises: (i) silica based, rare earth doped core having a first index of refraction n1; (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1>n2; wherein at least one of the core or cladding is doped with Al2O3, such that the ratio of max wt % to min wt % of Al2O3 concentration is less than 2:1.