Abstract
The pump lasers in the 1480-nm band have been considered as high-power, high-efficiency and highly reliable sources for erbium-doped fiber amplifiers (EDFAs).1.2 Since it is inevitable that the spontaneous emission tail of these lasers will extend to the signal band of EDFAs due to the material property of InGaAsP active layer, the degradation of noise figure of EDFAs is a major concern. This is especially true when pump lasers are used under high-current or high-temperature operations because of the increase of the spontaneous emission. In this paper a novel pump source was constructed, in which the pump power spectral density (PPSD) at signal band can be continuously adjusted while the power at pump band be kept constant. This is important because the noise figure of EDFAs also varies with the pump power. The measured degradation of noise figure was compared with theoretical calculation and it showed good agreement between them. The result indicates that for <0.5-dB degradation of noise figure, the PPSD is required to be less than -54 dB/nm at the input of erbium-doped fiber with copropagation or bidirectional pumping configurations.
© 1992 Optical Society of America
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