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. 05, 2007
Filed:
Mar. 30, 2004
Kazuhide Nakajima, Tsukuba, JP;
Katsusuke Tajima, Tsukuba, JP;
Jian Zhou, Tsukuba, JP;
Izumi Sankawa, Kawasaki, JP;
Kazuo Hogari, Tokai-mura, JP;
Kazuhide Nakajima, Tsukuba, JP;
Katsusuke Tajima, Tsukuba, JP;
Jian Zhou, Tsukuba, JP;
Izumi Sankawa, Kawasaki, JP;
Kazuo Hogari, Tokai-mura, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A single mode fiber is provided which is suitable for high-speed, large-capacity optical communication and for optical wiring. The single mode fiber has a first cladding region with a uniform refractive index, a core region with a refractive index higher than that of the first cladding region, and a second cladding region including at least four air hole regions placed in the first cladding region. Optimization can be achieved by making the distance from the center of the core region to the air hole regions equal to 2–4.5 times the core radius, and the air hole radius equal to or greater than 0.2 times the core radius. It is preferable the core radius be 3.7–4.8 μm, the relative index difference of the core region from the first cladding region be 0.3–0.55 %.