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:
Apr. 12, 2011
Filed:
Jun. 19, 2009
Yuki Taniguchi, Tokyo, JP;
Jiro Hiroishi, Tokyo, JP;
Masanori Takahashi, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
Yuki Taniguchi, Tokyo, JP;
Jiro Hiroishi, Tokyo, JP;
Masanori Takahashi, Tokyo, JP;
Ryuichi Sugizaki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A core includes a center core region, a core layer that is formed around the center core region and that has a refractive index lower than that of the center core region, and at least one buffer core layer that is formed between the center core region and the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. A cladding is formed around the core layer and that has a refractive index lower than that of the center core region and higher than that of the core layer. An effective core area at a wavelength of 1550 nm is equal to or smaller than 18 μm.