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Phase-shifted Bragg grating filters with symmetrical structures

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2 Author(s)
Li Wei ; Dept. of Phys., Waterloo Univ., Ont., Canada ; Lit, John W.Y.

A comprehensive theoretical analysis of the compound phase-shifted uniform fiber Bragg grating (FBG) filter is presented. The transmission characteristics are examined by a transfer matrix formulation. It is shown that the transmission spectrum of such a filter is significantly controlled by the ratio of the grating lengths. By suitably choosing the ratio, a quasi-flat-top spectrum may be obtained. The general condition for the optimum case is derived. This characteristic makes the compound phase-shifted uniform FBG filter particularly advantageous for applications in wavelength-multiplexed optic-fiber communication systems

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 8 )