Apparatus for fabricating apodized fiber grating

摘要

In the disclosed apodized fiber grating fabricating apparatus, a UV (Ultra Violet) laser (2) emits a UV laser beam (8), a beam splitter (10) splits the beam emitted from the laser into two beams (12,14), a plurality of mirrors (20,22,24) form light paths to concurrently project the split beams onto an optical fiber (60) from two directions by reflecting the split beams, a phase mask (40) passes the reflected beams therethrough to form gratings in the fiber in a predetermined period, a first blocking device (30) is disposed between the mask and one of the mirrors, progressively blocks one of the two beams from being projected toward the fiber from one direction, and provides apodization to the gratings, and a second blocking device (50), which is mobile and opposite to the first blocking device with respect to the fiber, progressively blocks the other beam from being projected toward the fiber from another direction and provides apodization to the gratings, so that an average refractive index variation is constant across the whole gratings.