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. 30, 2016
Filed:
Jun. 18, 2013
Nec Corporation, Minato-ku, Tokyo, JP;
Shigeki Takahashi, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A rib waveguide type high-order mode filter includes a plate-like slab region; a projection portionformed in a stripe along a waveguiding direction of light on the slab region; and a mesa regionhaving a bottom surface positioned at the same level as that of the bottom surface of the slab regionand a top surface positioned at a higher level than that of the top surface of the slab region, on at least one side of the slab region, wherein the projection portion, the slab region, and the mesa regionare made of the same material; and the mesa regionincludes a doped areain which an optical-absorption function is added by impurity doping into the material.