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Gain-flattening filter using long-period fiber gratings

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3 Author(s)
Harurnoto, M. ; Yokohama R&D Labs., Sumitomo Electr. Industries Ltd., Yokohama, Japan ; Shigehara, M. ; Suganurna, H.

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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Lightwave Technology, Journal of  (Volume:20 ,  Issue: 6 )