The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Dec. 22, 1989
Paul F Glodis, Atlanta, GA (US);
Kenneth L Walker, New Providence, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
The inventive method of producing optical fiber comprises producing a rod-like silica-based body, overcladding the body with pre-existing silica-based glass, and drawing fiber from the thus produced preform. The rod-like body comprises a core and a first cladding that surrounds the core, both consisting of deposited glass, and further comprises a second cladding that surrounds the first cladding and that is derived from a substrate tube that has a refractive index n.sub.2 <n.sub.0, the refractive index of vitreous silica. The overcladding comprises pre-existing glass, and comprises a third cladding region that has a refractive index n.sub.3 .ltoreq.n.sub.0. Typically, the overcladding material is derived from one or more overcladding tubes. The inventive method can be used to produce preforms capable of yielding more fiber than prior art rod-in-tube preforms, potentially resulting in significant cost reduction without performance penalties. A variety of advantageous embodiments of the inventive methods, as well as of fiber produced by the method, are disclosed.