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:
Jun. 08, 1976
Filed:
Dec. 27, 1974
Adolf R Asam, Daleville, VA (US);
International Telephone and Telegraph Corporation, Nutley, NJ (US);
Abstract
A method for forming optical fibers reduces losses of germania dopant due to evaporation during chemical vapor deposition. After deposition of a high purity silica layer on the inner surface of a hollow silica tube, the tube is closed at one end and loaded with a small amount of crystalline germanium compound, such as germanium iodide. The other end is then also sealed and the tube is heated to vaporize the GeI.sub.4 and deposit a coating of germanium. This process may be repeated to build up the Ge layer. The tube is then broken open at both ends and the iodine vapor removed. The germanium layer is oxidized and heated to diffuse germania into the silica layer to provide a doped high index of refraction core layer on a lower index cladding layer. The tube and layers are then collapsed to form a preform which is later drawn into the optical fiber.