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:
Sep. 07, 1999
Filed:
Aug. 29, 1996
Applicant:
Inventors:
Hiroaki Okano, Ibaraki-ken, JP;
Yasuharu Mutoh, Ibaraki-ken, JP;
Toshikazu Kamoshida, Ibaraki-ken, JP;
Assignee:
Hitachi Cable, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385132 ; 385129 ; 65386 ;
Abstract
An optical waveguide comprises an anhydrous synthetic silica glass substrate 1, which contains less than a predetermined concentration of hydroxyl group, a core waveguide 2 having a rectangular cross-section being formed on the substrate 1, and a cladding layer 3 having a lower refractive index thereof than the core waveguide 2 being covered by the cladding layer 3. The concentration of hydroxyl group contained in a synthetic silica glass substrate of an optical waveguide or an optical device is essentially less than 300 ppm, preferably less than 100 ppm, more preferably less than 50 ppm.