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Gain-flattening filter design using rotationally symmetric crossed gratings

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3 Author(s)
Lobo, A.E. ; Centre for Ultrahigh Bandwidth Devices for Opt. Syst., Univ. of Sydney, NSW, Australia ; Besley, J.A. ; Martijn de Sterke, C.

We present a method for designing gain-flattening filters using rotationally symmetric crossed gratings. This involves adjusting the fiber and grating parameters to obtain desirable coupling interactions between the forward-propagating core mode and the backward-propagating cladding modes. A chirped grating with an optimized envelope of the grating strength with axial position is then used to obtain an appropriate transmission spectrum. Here, we demonstrate that the gain spectrum of a typical erbium-doped fiber amplifier could be equalized using this method. The main advantages of this type of grating are its polarization insensitivity and low back reflection.

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Lightwave Technology, Journal of  (Volume:21 ,  Issue: 9 )