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:
Nov. 24, 1998
Filed:
Mar. 07, 1997
Applicant:
Inventors:
Graeme Douglas Maxwell, Ipswich, GB;
Benjamin James Ainslie, Ipswich, GB;
Assignee:
British Telecommunications public limited company, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385129 ; 385131 ; 385132 ; 216 74 ; 216 80 ; 65444 ; 65448 ;
Abstract
Planar waveguides are produced by using radiation to write path regions into a photosensitive layer. Originally, the photosensitive layer had the same refractive index as the confining regions, e.g., it consists of silica doped with oxides of Ge and B. Composite path regions are produced by depositing a glass soot onto a partial region. On sintering the soot melts to fill up the empty spaces and thereby create a composite layer.