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. 06, 2011
Filed:
May. 16, 2003
Kazunori Suzuki, Yokosuka, JP;
Satoki Kawanishi, Yokohama, JP;
Hirokazu Kubota, Yokohama, JP;
Masatoshi Tanaka, Itami, JP;
Moriyuki Fujita, Itami, JP;
Kazunori Suzuki, Yokosuka, JP;
Satoki Kawanishi, Yokohama, JP;
Hirokazu Kubota, Yokohama, JP;
Masatoshi Tanaka, Itami, JP;
Moriyuki Fujita, Itami, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Mitsubishi Cable Industries, Ltd., Hyogo, JP;
Abstract
A 1.55 μm band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region 'a' is heavily doped with GeO. A core region 'b' is composed of pure SiOglass. A cladding section is arranged around the core region. The cladding section has a lot of holes extending in the longitudinal direction of the optical fiber. The holes of the cladding section are not located at random, but have a honeycomb structure composed of regular hexagons which have a side length of Λ, and serve as a primitive lattice. The center of the core section has a region having a refractive index higher than that of the periphery of the core section. The core section has the refractive index distribution in which the group velocity dispersion at the operation wavelength of the region becomes the normal dispersion.