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:
Aug. 20, 2013
Filed:
Sep. 06, 2012
Peter Ingo Borel, Frederiksberg, DK;
David John Digiovanni, Mountain Lakes, NJ (US);
John Michael Fini, Metuchen, NJ (US);
Poul Kristensen, Valby, DK;
Peter Ingo Borel, Frederiksberg, DK;
David John DiGiovanni, Mountain Lakes, NJ (US);
John Michael Fini, Metuchen, NJ (US);
Poul Kristensen, Valby, DK;
OFS Fitel, LLC, Norcross, GA (US);
Abstract
Described is a method of fabricating an optical fiber preform that includes a deep index trench comprising a shallower outer trench portion formed on a substrate tube and a deeper inner trench portion formed on the shallower outer trench portion. Each of the shallower outer trench and deeper inner trench portions comprises multiple silica layers. The method comprises the steps of: (1) forming each layer of the shallower outer trench portion in a single-pass deposition of a F-containing silica layer; and (2) forming each layer of the deeper inner portion in a double-pass deposition in which, in a first pass, a layer of silica soot is deposited and then, in a second pass, the soot is sintered in the presence of SiF.