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:
Sep. 29, 2009
Filed:
Nov. 30, 2005
Takahiro Hamada, Sakura, JP;
Kenji Yamashiro, Sakura, JP;
Munehisa Fujimaki, Sakura, JP;
Koichi Harada, Sakura, JP;
Yukinari Shirako, Sakura, JP;
Hiroyuki Sawano, Sakura, JP;
Shunichirou Hirafune, Sakura, JP;
Takahiro Hamada, Sakura, JP;
Kenji Yamashiro, Sakura, JP;
Munehisa Fujimaki, Sakura, JP;
Koichi Harada, Sakura, JP;
Yukinari Shirako, Sakura, JP;
Hiroyuki Sawano, Sakura, JP;
Shunichirou Hirafune, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
A treatment method for an optical fiber including accommodating an optical fiber inside a treatment chamber; introducing a deuterium containing gas into the treatment chamber; and in a deuterium treatment step, exposing the optical fiber to atmosphere of the deuterium containing gas. In the deuterium treatment step, a deuterium concentration D in the treatment chamber during the deuterium treatment is calculated from an initial value A of a deuterium concentration in the deuterium containing gas inside the treatment chamber, a concentration B of oxygen in an ambient atmosphere of the treatment chamber, and a concentration C of oxygen in the deuterium containing gas inside the treatment chamber, and the deuterium concentration in the treatment chamber is controlled based on the deuterium concentration D calculated. Other gases such as hydrogen containing gas or nitrogen containing gas may also be used according to the invention.