Abstract

The gain and noise figure can be improved by periodic bending of an erbium-doped fiber. Bending of 5.4  m at the beginning of an erbium-doped fiber results in a reduction of noise figure, a gain increment, and a reduction of forward amplified spontaneous emission of 5.1, 3.6, and 1.5  dB for a 1533-nm small signal; 4.0, 1.9, and 2.1  dB for a 1550-nm small signal; and 2.7, 0.9, and 1.8  dB for a 1560-nm small signal -40 dBm, respectively. In addition, the periodic bending can operate an erbium-doped fiber amplifier at quantum-limited noise and enables its operation to be more stable.

© 1997 Optical Society of America

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