Patent ID: 7646950

Claim:
A method for manufacturing fiber gratings, comprising: generating a group of first fiber gratings simultaneously in a first region of an optical fiber by selectively exposing the optical fiber to a light source; and generating a group of second fiber gratings simultaneously in a second region of the optical fiber by selectively exposing the optical fiber to the light source, the second region being substantially spaced apart from the first region in a longitudinal direction of the optical fiber at a different angle from the group of first fiber gratings about an axis of the optical fiber; wherein the group of second fiber gratings are formed at one of 90 degrees and 270 degrees to the group of first fiber gratings about the axis of the optical fiber, and wherein generating the group of second fiber gratings includes: making relative movements of the optical fiber and the light source in the longitudinal direction of the optical fiber; and rotating the optical fiber by one of 90 degrees and 270 degrees about the longitudinal direction of the optical fiber before selectively exposing the rotated optical fiber to the light-source.