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:
Aug. 10, 2004
Filed:
Oct. 23, 2001
British Telecommunications public limited company, London, GB;
Abstract
A method of producing a planar waveguiding device having a core [ ] and a cladding [ ]. The cladding has groves [ ] directly interfacing [ ] with the core [10]. A layer of core glass [ ] is deposited on the surface of a substrate [ ]. This layer is etched to produce a shaped layer which includes a first core portion [ ] having the same configuration as the intended core [ ] and an expanded core portion [ ] wherein the core glass extends beyond the intended core boundary. A glass covering layer [ ] is deposited over the etched core glass and grooves [ ] are produced by etching through the covering layer [ ] and into said expanded core portion [ ]. This removes the core glass [ ] extending beyond the intended core [ ] boundary to produce interfaces [ ] between the core [ ] and the grooves [ ]. All of the glasses are silica with additives to adjust the refractive index and/or the melting point.