We present numerical and experimental analysis of bi-directionally, dual-wavelength pumped extended L-band erbium-doped fiber amplifiers (EDFAs) that use a standard 1480 nm laser diode as the forward pump source and a high-power C-band light source as the backward pump source. When using a ~1535 nm backward pump, efficient amplification can be obtained over the extended L-band with no penalty to the noise figure. Experimentally, a bi-directionally pumped L-band EDFA achieves a wideband 20 dB-gain, covering 1570–1619 nm, with a noise figure lower than 5.6 dB. With either 1530.7 nm or 1537.8 nm as the backward pump wavelength, and 1480 nm as the forward pump wavelength, the power conversion efficiency is 40% higher compared to a configuration using 1480 nm pumping for both directions. To our best knowledge, it is the first time that C-band light has been used as the backward pump source for extended bandwidth of L-band EDFAs operating beyond 1610 nm.

中文翻译：

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双向双波长泵浦扩展 L 波段 EDFA 的研究

我们介绍了双向双波长泵浦扩展 L 波段掺铒光纤放大器 (EDFA) 的数值和实验分析，该放大器使用标准 1480 nm 激光二极管作为前向泵浦源和高功率 C 波段光源作为后向泵源。当使用 ~1535 nm 反向泵浦时，可以在扩展的 L 波段上获得有效的放大，而不会对噪声系数造成损失。实验上，双向泵浦 L 波段 EDFA 实现了 20 dB 的宽带增益，覆盖 1570-1619 nm，噪声系数低于 5.6 dB。将 1530.7 nm 或 1537.8 nm 作为后向泵浦波长，将 1480 nm 作为前向泵浦波长，与使用双向 1480 nm 泵浦的配置相比，功率转换效率高 40%。据我们所知，