Apparatus and method for fabricating multi-period optical fiber grating

Disclosed is an apparatus and method for fabricating a multi-period optical fiber grating. The apparatus includes an optical light source; a movable optical fiber having a first part of the optical fiber and at least a second part of the optical fiber bent from the first part and arranged substantially parallel with the first part of the optical fiber; and a multi-period amplitude mask including a first sector having a predetermined on-off ratio corresponding to the first part of the optical fiber and at least a second sector disposed substantially parallel with the first sector and having an on-off ratio different from the predetermined on-off ratio, wherein the mask position on top of the fiber is translated in relation to the light source so that the gratings of differing periods can be formed along the exposed optical fiber member.