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:
May. 16, 2006
Filed:
Sep. 26, 2002
Satoki Kawanishi, Yokohama, JP;
Kazunori Suzuki, Yokosuka, JP;
Hirokazu Kubota, Yokohama, JP;
Masatoshi Tanaka, Itami, JP;
Moriyuki Fujita, Itami, JP;
Satoki Kawanishi, Yokohama, JP;
Kazunori Suzuki, Yokosuka, 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 polarization-maintaining optical fiber and absolutely single-polarization optical fiber are provided which enable long distance transmission maintaining a polarization state of signal light. The polarization-maintaining optical fiber includes a core, photonic crystal cladding, and jacket. The photonic crystal cladding is divided into four segments by broken lines from the center to the periphery. Among a plurality of grating holes in a pair of segments opposed to each other with respect to the core, the diameter of grating holes close to the core is greater than the diameter of grating holes in another pair of segments opposed with each other, and than a grating constant.