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摘要:
三阶拉曼光纤放大器因其较高的增益与较低的噪声指数被用于长距离无中继光传输中。三阶拉曼放大器作为拉曼放大的前沿技术，目前国内对其的研究较少，泵浦的配置与放大器的性能关系还不够明晰。为此，本文实验测试了二阶泵浦种子光对三阶拉曼光纤放大器的性能影响。本文首先用功率耦合方程定性分析了不使用二阶泵浦种子光的可行性，之后实验验证了在缺少二阶泵浦种子光的条件下，三阶拉曼光纤放大器仍能实现对信号光的增益，但相比有二阶泵浦种子光时效率会降低。本文搭建了47波200 km的波分复用传输系统实验验证，结果表明：在没有二阶泵浦种子光的情况下三阶拉曼光纤放大器也可以实现对信号光的增益，但引入二阶泵浦种子光能显著提升性能，仅25 mW的二阶泵浦种子光就能使信号得到最少3.7 dB，平均6 dB的功率提升以及平均0.8 dB的光信噪比提升。省去二阶泵浦种子光能降低成本，但引入二阶泵浦种子光能对三阶拉曼放大器带来显著的性能提升。
Abstract:Third-order Raman fiber amplifier is used in long-haul unrepeatered optical transmission due to its higher gain and lower noise figure. Third-order Raman fiber amplifier is an advanced technology in Raman amplification, and currently there is very limited research on it in China. The relationship between the pump configuration and performance of the amplifier is not clear yet. Therefore, this paper analyzes the influence of second-order pump seed light on third-order Raman fiber amplifiers through experiments. Firstly, the feasibility of not using second-order pump seed light is qualitatively analyzed. Then it is experimentally verified that in the absence of second-order pump seed light, the third-order Raman fiber amplifier can still achieve signal light gain, but its efficiency will decrease. A 47-channel 200 km wavelength division multiplexing transmission system is constructed, the experimental results show that the third-order Raman fiber amplifier can amplify the signal light without second-order pump seed light, but the introduce of the second-order pump seed light can significantly improve its performance. A second-order pump seed light with only 25 mW can achieve a minimum signal power gain of 3.7 dB, an average gain of 6 dB, and an average signal-to-noise ratio gain of 1.6 dB. Eliminating second-order pump seed light can reduce costs, but introducing a second-order pump seed light brings significant performance improvements to third-order Raman amplifiers.
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图 2 无二阶泵浦种子光时三阶拉曼光纤放大器工作原理
Figure 2. Principle of third order Raman amplifier without second order pump seed light
图 5 输入一阶和三阶泵浦光时输出端光谱
Figure 5. The output spectrum with
1435 nm and1276 nm pumps as input
图 6 仅三阶泵浦光输入时，各阶泵浦光功率随三阶泵浦光输入功率变化
Figure 6. The relationship between the power of pumps and the input power of the third-order pump when only the third-order pump is input
图 7 一阶+三阶泵浦光输入时，各阶泵浦光功率随三阶泵浦光输入功率变化
Figure 7. The relationship between the power of pumps and the input power of the third-order pump when first-order pump and third-order pump are input
图 8 二阶泵浦种子光对一阶泵浦光输出功率的影响
Figure 8. The influence of second-order pump seed light on the output power of first-order pump light
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