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. 13, 2002
Filed:
Aug. 31, 2000
Timothy Edward Hammon, Silver Spring, MD (US);
Jonathan Mark Bulman, Cremorne, AU;
JDS Uniphase Pty. Ltd., North Ryde, AU;
Abstract
The invention provides a method of forming a grating structure on a photosensitive waveguide, involving: moving the waveguide relative to a light source in the longitudinal direction of the grating, directing coherent light from the light source perpendicularly to the direction of relative movement of the waveguide and irradiating spaced-apart regions of the waveguide to form the grating structure, modulating the light and, as a separate step, passing the light through a shutter in its passage between the light source and the waveguide, and controlling the shutter to effect shuttering of the light in synchronisation with the relative movement of the waveguide during formation of the grating structure, in order to control the irradiation of said waveguide so as to keep constant the refractive index in the waveguide core averaged over a full period of said grating structure.