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. 18, 2006
Filed:
Oct. 01, 2003
Junji Yamauchi, Koganei, JP;
Michiya Masuda, Yokohama, JP;
Ryouichi Tazawa, Yokohama, JP;
Hisamatsu Nakano, Kodaira, JP;
Yuichi Yamamoto, Koganei, JP;
Junji Yamauchi, Koganei, JP;
Michiya Masuda, Yokohama, JP;
Ryouichi Tazawa, Yokohama, JP;
Hisamatsu Nakano, Kodaira, JP;
Yuichi Yamamoto, Koganei, JP;
NHK Spring Co., LTD, Kanagawa, JP;
Abstract
An arrayed-waveguide grating type optical multi-demultiplexer includes input waveguides, a first slab waveguide, a channel waveguide array, a second slab waveguide, and output waveguides. A pair of different refractive index regions, each having a refractive index different from that of the second slab waveguide, are formed on the second slab waveguide near a boundary between the second slab waveguide and channel waveguide array. The different refractive index regions project in peninsular shapes from both side portions of the slab waveguide. Light traveling from each waveguide of the channel waveguide array toward the output waveguides passes through the different refractive index regions. An optical distribution with a flattened field-distribution peak is created at a boundary between the second slab waveguide and output waveguides.