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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 20,
  • Issue 6,
  • pp. 1027-
  • (2002)

Gain-Flattening Filter Using Long-PeriodFiber Gratings

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Abstract

We propose a novel structure for a gain-flattening filter, in which a conventional long-period fiber grating (LPFG) and a phase-shifted LPFG are written closely. The transmission characteristics are investigated in the case of a closely arranged configuration. For the fabrication of a phase-shifted LPFG, a UV-trimming method to control the amount of the phase shift is examined theoretically and experimentally. Finally, a 67-mm-long LPFG gain-flattening filter designed for an erbium-doped fiber amplifier is fabricated and the measured spectrum is shown.

[IEEE ]

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