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:
Dec. 25, 2007
Filed:
Sep. 10, 2004
Masahiro Yanagisawa, Mito, JP;
Taisuke Oguchi, Mito, JP;
Yasuyuki Inoue, Isehara, JP;
Yoshinori Hibino, Atsugi, JP;
Yasuhiro Hida, Atsugi, JP;
Motohaya Ishii, Atsugi, JP;
Masahiro Yanagisawa, Mito, JP;
Taisuke Oguchi, Mito, JP;
Yasuyuki Inoue, Isehara, JP;
Yoshinori Hibino, Atsugi, JP;
Yasuhiro Hida, Atsugi, JP;
Motohaya Ishii, Atsugi, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
Disclosed is a wavelength multi/demultiplexer for separating two wavelength bands with a narrow wavelength spacing. A dielectric multilayer filter is provided in an intersection portion where two optical waveguides intersect each other and separates incident light to the dielectric multilayer filter to transmitted light and reflected light. Here, the distance X from the multilayer surface on the light-incident side of the dielectric multilayer to the central intersection point of the two intersecting optical waveguides is arranged to satisfy 0≦X≦d/2 (where 'd' represents the thickness of the dielectric multilayer). With this configuration, a multi/demultiplexer can be realized that shows good wavelength response without spectral degradation even for two wavelengths having narrow wavelength spacing.