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:
Nov. 02, 2004
Filed:
Jan. 29, 2003
Haruhiko Tabuchi, Kawasaki, JP;
Terukazu Naruse, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention aims at providing a wavelength multiplexing/demultiplexing apparatus for reducing a loss at a portion where an input slab and channel waveguides are connected with each other, thereby capable of realizing the reduction of loss in the overall apparatus. In order to achieve the above object, in this wavelength multiplexing/demultiplexing apparatus comprising an input waveguide, an input slab, channel waveguides, an output slab and output waveguides that are formed on a substrate, a curvature radius (r1) of an output side circular arc interface of the input slab is smaller than a curvature radius (r2) of an input side circular arc interface of the output slab, and spacing (P ) between the channel waveguides at a portion where the input slab and each of the channel waveguides are connected with each other is smaller than spacing (P ) between the channel waveguides at a portion where each of the channel waveguides and the output slab are connected with each other.