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中文摘要：
提出并论证了一种新的低噪声系数C＋L波段掺铒光纤放大器的结构。在该结构中，利用一个前置放大器以减少噪声系数，并利用一个带有光纤布拉格光栅的双通结构以增加L波段增益，同时减少噪声系数。实验结果表明，新宽带放大器的噪声系数减小了约2dB，并且在1525～1605nm波长范围内，增益提高到了25dB以上。
英文摘要：
A new configuration of the low noise figure C＋L-band erbium-doped fiber amplifier was proposed and demonstrated. In the proposed configuration, a preamplifier was used to reduce the noise figure, and an improved double-pass configuration with a fiber bragg grating was employed to enhance the L-band gain and while to reduce the noise figure. The experiment results demonstrate that the noise figure in the new broad-band amplifier was im- proved by -2 dB, and the gain was enhanced up to above 25 dB over the region from 1 525-1 605 nm.
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