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:
Oct. 07, 2003
Filed:
Jun. 16, 2000
Hiroshi Kawashima, Chiyoda-ku, JP;
Kazutaka Nara, Chiyoda-ku, JP;
Shiro Nakamura, Chiyoda-ku, JP;
Kazunori Watanabe, Chiyoda-ku, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a planar lightwave circuit platform and its method for manufacturing by which the characteristics of the planar lightwave circuit become stable. In a planar lightwave circuit platform comprising quartz-based lower cladding layer ( ), height adjusting layer ( ), core layer ( ), and upper cladding layer ( ) formed in order on substrate ( ), wherein the glass softening temperature of the height adjusting layer ( ) is set to be higher than the glass softening temperatures and the temperatures for transparent-vitrification of the core layer ( ) and upper cladding layer ( ).