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.

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  1. A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan and J. E. Sipe, "Long-period fiber gratings as band-rejection filters", J. Lightwave Technol., vol. 14, pp. 58-64, Jan. 1996.
  2. V. E. Perlin and H. G. Winful, "Nonlinear pulse switching using long-period fiber gratings", J. Lightwave Technol., vol. 18, pp. 329-333, Mar. 2000.
  3. T. Erdogan, "Fiber grating spectra", J. Lightwave Technol., vol. 15, pp. 1277-1294, Aug. 1997 .

J. Lightwave Technol. (3)

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan and J. E. Sipe, "Long-period fiber gratings as band-rejection filters", J. Lightwave Technol., vol. 14, pp. 58-64, Jan. 1996.

V. E. Perlin and H. G. Winful, "Nonlinear pulse switching using long-period fiber gratings", J. Lightwave Technol., vol. 18, pp. 329-333, Mar. 2000.

T. Erdogan, "Fiber grating spectra", J. Lightwave Technol., vol. 15, pp. 1277-1294, Aug. 1997 .

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