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Gain-clamped fiber amplifier with a short length of preamplification fiber

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1 Author(s)
K. Inoue ; NTT Labs., Kanagawa, Japan

Although gain-clamping an erbium-doped fiber amplifier (EDFA) by a counterpropagating ring resonator prevents oscillation light from being output, it degrades the amplifier's noise figure. The noise figure degradation can be reduced by using a length of EDF, that is short enough not to cause any gain saturation, for preamplification. Experiments confirm that the prestage EDFA reduces the noise figure degradation under constant gain operation.

Published in:

IEEE Photonics Technology Letters  (Volume:11 ,  Issue: 9 )