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. 02, 2004
Filed:
Apr. 01, 2002
Applicant:
Inventors:
Richard Ian Laming, Edinburgh, GB;
Martin Cole, Delray Beach, FL (US);
Assignee:
Pirelli Cavi E Sistemi S.p.A., Milan, IT;
Primary Examiner:
Int. Cl.
CPC ...
G02B 2/742 ; G02B 6/00 ;
U.S. Cl.
CPC ...
G02B 2/742 ; G02B 6/00 ;
Abstract
A method of fabricating an optical waveguide grating having a plurality of grating lines of refractive index variation comprises the steps of: (i) repeatedly exposing a spatially periodic writing pattern onto a photosensitive optical waveguide: and (ii) moving the writing light pattern and/or the waveguide between successive exposures of the writing light pattern, so that each of at least a majority of the grating lines is generated by at least two exposures to different respective regions of the writing light pattern.