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:
Mar. 15, 2005
Filed:
Jul. 15, 2003
Applicants:
Makoto Takahashi, Kokubunji, JP;
Tatemi Ido, Kodaira, JP;
Hirohisa Sano, Niiza, JP;
Tomoaki Shibata, Tsukuba, JP;
Inventors:
Makoto Takahashi, Kokubunji, JP;
Tatemi Ido, Kodaira, JP;
Hirohisa Sano, Niiza, JP;
Tomoaki Shibata, Tsukuba, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Chemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B006/16 ; G02B006/26 ; H01S003/07 ;
U.S. Cl.
CPC ...
Abstract
An optical transmitter/receiver module of wavelength division multiplexing type which undergoes a reduced excess loss resulting from the displacement of a dicing position is fabricated with a high yield rate. An optical waveguide for guiding reflected light from a wavelength selection filter has a core substantially larger in size than the core of each of the other optical waveguides.