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:
Apr. 05, 2005
Filed:
Jul. 29, 2002
Shigeru Yoneda, Tokyo, JP;
Shigeru Yoneda, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
To obtain an optical waveguide device suppressed in fluctuations of characteristics of optical waveguide element due to temperature changes. An arrayed waveguide grating as an optical waveguide device comprises a flat waveguide element of specified thickness hforming an optical waveguide layer on a silicon substrate, a first correction substrate of thickness h1 adhered to the optical waveguide layer side, and a second correction substrate of thickness hadhered to the silicon substrate side. By properly setting the coefficients of linear expansion α, αand Young's moduls E, Eof the two correction substrates, and using first and second adhesives of high rigidity, warp and expansion and contraction of the waveguide element due to temperature changes can be suppressed to minimum limit. Therefore, the optical waveguide device does not require temperature adjustment.