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Optimal design of a multichannel fiber Bragg grating by using the DC sampling method

A novel and flexible method for producing a multichannel filter from a single-channel fiber Bragg grating (FBG) is proposed and numerically demonstrated. The proposed method enables us to produce a multichannel filter from a single channel FBG just by using the direct UV exposure without the need of the expense and the complex phase mask. Moreover, the proposed method provides much more flexibilities to design any other new kinds of fiber gratings than ever before.