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:
Jul. 04, 2006
Filed:
Sep. 30, 2003
Ralf Domres, Ruemmelsheim, DE;
Norbert Wolfram Gehenn, Mainz, DE;
Uwe Kolberg, Mainz, DE;
Georg Krolla, Mainz, DE;
Frank Thomas Lentes, Bingen, DE;
Ralf Domres, Ruemmelsheim, DE;
Norbert Wolfram Gehenn, Mainz, DE;
Uwe Kolberg, Mainz, DE;
Georg Krolla, Mainz, DE;
Frank Thomas Lentes, Bingen, DE;
Schott Glas, Mainz, DE;
Abstract
The stepped optical fiber has a core glass member and a surrounding cladding glass member. It has a high numerical aperture (NA)≧0.50. The core glass member preferably has a zinc-containing composition including, in % by weight, SiO, 42 to 53; ZnO, 16 to 38; PbO, 1 to 20; NaO, <14; KO, <12; with a sum of ZnO and PbO≧30 and a sum of NaO and KO is ≧2. The cladding glass composition, which is compatible with this core glass, includes, in percent by weight, SiO, 60 to 72; BO, <20; AlO, <10; NaO, <18; and KO, <15. The resulting optical fiber has low attenuation, very neutral color transmission and low manufacturing costs. Other cladding glass compositions resulted in considerably poorer properties with too much crystallization at the core glass boundary layer. Environmentally-friendly, lead-free embodiments of the core glass were also prepared having even lower aperture values of ≧0.48.