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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 23, Iss. 3 — Mar. 1, 2005
  • pp: 1441–

N-Fold Symmetric Gratings as Gain-Flattening Filters

Audrey Elisa Lobo, C. Martijn de Sterke, and James A. Besley

Journal of Lightwave Technology, Vol. 23, Issue 3, pp. 1441- (2005)

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We present N-fold symmetric gratings as gain-flattening filters, since they are polarization insensitive and capable of exhibiting low back reflection. These gratings consist of N superimposed identical tilted gratings which are evenly distributed azimuthally. The coupling interactions between the forward propagating core mode and the backward propagating cladding modes are analyzed, including the limit when N --> infinity which is a rotationally symmetric grating. The fiber grating parameters are optimized to equalize the gain profile of a typical erbium doped fiber amplifier to within 0.07 dB. Finally, we examine how the performance of the gain-flattening filter depends on the blaze angle and the effect of an uneven azimuthal distribution of the grating.

© 2005 IEEE

Audrey Elisa Lobo, C. Martijn de Sterke, and James A. Besley, "N-Fold Symmetric Gratings as Gain-Flattening Filters," J. Lightwave Technol. 23, 1441- (2005)

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