Patent ID: 7664351

Claim:
A method of manufacturing a CO 2 laser grooved long period fiber grating, the method comprising: situating a fiber on a focal plane; fixing one end of said fiber and weighting the other end; scanning for a first time in a first location; rescanning in said first location; scanning in an adjacent location to said first location; rescanning in said adjacent location; scanning in N number of additional adjacent locations; and rescanning in said N number of additional locations; wherein scanning and rescanning is performed by a laser beam with a diameter of 30 to 40 μm using a CO 2 laser to create a local high temperature in the fiber which leads to deforming of the fiber and to gasification of SiO 2 on the surface of the fiber to form grooved grates having groove depths at about 10 to 20 μm and widths of about 45 to 55 μm.