The behavior of alumino-phosphate-silicate (APS) erbium-doped fiber power amplifiers (EDFAs) for various pump wavelengths, in the small signal and large signal regime, has been well studied with 800-nm-band pumping. It has already been shown that bidirectional pumping is more efficient, especially at shorter wavelengths, due to the presence of large excited state absorption (ESA). However, bidirectional pumping requires more components which can increase the complexity and cost of the system. In this work, a computer model was used to compare the performance of power EDFAs with a Bragg reflecting pump mirror etched at the output end of the fiber. For small pump powers (P/sub p/ approximately=10 mW) this configuration is better than bidirectional pumping, both for gain and noise figure. At large pump powers (P/sub p/ approximately=200 mW) the output signal powers are comparable and the noise figure is better for the configuration with the reflecting mirror.
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机译：在800 nm波段泵浦条件下，已经很好地研究了铝磷酸盐-硅酸盐（APS）掺b光纤功率放大器（EDFA）在各种信号波长下的小信号和大信号状态。已经表明，由于存在大的激发态吸收（ESA），双向泵浦效率更高，尤其是在较短的波长下。但是，双向泵送需要更多的组件，这会增加系统的复杂性和成本。在这项工作中，使用计算机模型比较了功率EDFA与在光纤输出端蚀刻的布拉格反射泵镜的性能。对于小泵浦功率（P / sub p /大约= 10 mW），无论增益还是噪声系数，该配置均优于双向泵浦。在大泵浦功率（P / sub p /大约= 200 mW）下，输出信号功率是可比的，并且对于带有反射镜的配置，噪声系数更好。
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