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. 25, 2005
Filed:
Oct. 21, 2002
Tadao Inoue, Kawasaki, JP;
Goji Nakagawa, Kawasaki, JP;
Koji Suzuki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A planar optical waveguide device including a substrate having a first coefficient of thermal expansion; a lower cladding layer formed on the substrate, the lower cladding layer having a second coefficient of thermal expansion smaller than the first coefficient of thermal expansion; a core formed on the lower cladding layer; an upper cladding layer formed on the lower cladding layer so as to cover the core, the upper cladding layer having the second coefficient of thermal expansion; and a plurality of grooves formed in the upper and lower cladding layers on the opposite sides of the core so as to extend along the core. The planar optical waveguide device further includes a contraction material filling each groove and fixed to the upper and lower cladding layers. The contraction material may be provided by a thermosetting resin.