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:
Aug. 02, 2005
Filed:
Dec. 16, 2002
Shin Kamei, Zama, JP;
Motohaya Ishii, Atsugi, JP;
Akihiro Takagi, Mito, JP;
Takeshi Kitagawa, Yokohama, JP;
Shin Kamei, Zama, JP;
Motohaya Ishii, Atsugi, JP;
Akihiro Takagi, Mito, JP;
Takeshi Kitagawa, Yokohama, JP;
Nippon Telegraph and Telephone, Tokyo, JP;
Abstract
A practical optical waveguide circuit is provided which includes many intersections but is low loss. The width of a waveguide core is wat input and output terminal sections and wat an intersecting section, where w>w. The core width of the intersecting section is made different from that of the input and output terminal sections, or the core height of the intersecting section is made different from that of the input and output terminal sections. The core width is smoothly varied between the intersecting section and the input and output terminal sections by a tapered section. When the number of the waveguides intersecting with the intersecting section is 100, the intersection loss is 5.8 dB for the conventional device where w=w=5 μm, but is 1.8 dB when w=12 μm, thereby being able to reduce the intersection loss sharply.