Patent ID: 6707956
Filing Date: 2004-03-16
Classification: G02B

Abstract:
An apparatus for fabricating an apodized fiber grating, comprising:an ultraviolet laser for emitting an ultraviolet laser beam; a beam splitter for splitting the ultraviolet laser beam emitted from the ultraviolet laser into two beams; a plurality of mirrors for forming light paths to concurrently project the split beams onto an optical fiber from two directions by reflecting the split beams; a phase mask for passing one of the reflected beams to form gratings in the optical fiber in a predetermined period; a first blocking device disposed between the phase mask and one of the mirrors; first moving means for moving the first blocking device so as to progressively block said one of the reflected beams from being projected toward the optical fiber from one direction and providing apodization to the formed gratings; a second blocking device which is disposed opposite to the first blocking device with respect to the optical fiber; and second moving means for moving the second blocking device so as to progressively block another of the reflected beams from being projected toward the optical fiber from another direction, and providing apodization to the formed gratings, so that an average refractive index variation is constant across all of the gratings.