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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 21,
  • Issue 9,
  • pp. 2084-
  • (2003)

Gain-Flattening Filter Design Using Rotationally Symmetric Crossed Gratings

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Abstract

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.

© 2003 IEEE

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