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:
Jan. 10, 2012
Filed:
Jan. 18, 2008
Hiroaki Chida, Tokyo, JP;
Hiroaki Chida, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
To provide a low-cost and fine-property bidirectional optical transmitting/receiving module and the like, which include a de-multiplexing device that uses a V-letter shaped optical waveguide and a dielectric multilayer filter. Formation of an end face where the dielectric multilayer film is formed and separation of optical modules are performed in separate steps, and the end face at the intersection of the V-letter shaped optical waveguide, on which the dielectric multilayer filter is formed, is formed by dry etching to achieve high smoothness. Further, a cutting face of the optical module is set at a position that is isolated from the end face at least by 3 μm. Through the above, the smooth end face is protected from roughness of the cutting face caused by a light emitting element separating step, and the dielectric multilayer filter is formed on that end face.