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:
Nov. 28, 2006
Filed:
Mar. 10, 2003
Eiichiro Yamada, Yokohama, JP;
Kazuhito Saito, Yokohama, JP;
Mitsuaki Tamura, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A method of and an apparatus for expanding the mode field diameter of an optical fiber by heating a specified region of the optical fiber with a uniform or desired temperature distribution for forming a thermally-diffused expanded core (TEC). The mode field diameter of the optical fiber is expanded by heating an optical fiberwith a burnerso as to thermally diffuse the dopant forming the refractive-index profile. The burnerhas a heating surfacein which a plurality of gas-issuing holesare arranged such that a plurality of parallel rows each of which is composed of a plurality of gas-issuing holesare parallel to the axis of the optical fiber