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:
Jan. 18, 1994
Filed:
Oct. 09, 1992
Applicant:
Inventors:
Livio Cognolato, Baldissero Torinese, IT;
Angelantonio Gnazzo, Alessandria, IT;
Assignees:
SIP - Societa Italiana per L'Escercizio delle Telecomunicazioni p.a., Turin, IT;
SIRTI S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
65 182 ; 65 184 ; 65 6051 ; 65 6053 ; 65 608 ; 427555 ; 430321 ;
Abstract
In order to fabricate strip monomode active optical waveguides for optical telecommunications, a layer of vitreous soot is deposited on the interior of a tubular substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.