Patent ID: 6907165

Claim:
A method of fabricating a regenerated optical waveguide grating, comprising: hydrogenating an optical waveguide; generating a UV laser beam interference fringe pattern; exposing a grating section of the hydrogenated optical waveguide to the UV laser beam interference fringe pattern for a first exposure period, to cause a Type I grating to form within the grating section; exposing the grating section to the interference fringe pattern for a second exposure period, to cause the Type I grating to be erased; and, exposing the grating section to the interference fringe pattern for a third exposure period, to cause a regenerated optical waveguide grating to form within the grating section, the regenerated grating having a resonant wavelength at a start of the third exposure period which is substantially the same as a final wavelength of the UV interference fringe pattern, and the resonant wavelength of the regenerated grating shifting to a longer wavelength during the third exposure period.