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实现了前向两波长泵浦及3波长泵浦拉曼光纤放大器(RFA).实验中所用的信号为符合ITU T建议的C波段20信道波分复用信号,波长为1537.377～1560.605nm,信号传输距离分别为100和75km.其中,3波长泵浦的增益波动<1.47dB,所获得的最低光信噪比(OSNR)为32.5dB,优于同样条件下后向泵浦所获得的OSNR.详细研究了前向泵浦的增益饱和特性,实验结果表明,饱和功率随增益的增加而降低,且增加的增益加剧了增益饱和现象;对所研究的两泵浦配置前向泵浦放大器,饱和功率～5dBm.
The forward two-wavelength pump and the 3-wavelength Raman fiber amplifier (RFA) are realized.The signal used in the experiment is the C-band 20-channel WDM signal with the wavelength of 1537.377 ~ 1560.605nm and the signal The transmission distance is 100 km and 75 km, respectively. Among them, the gain of 3-wavelength pump fluctuates <1.47 dB, and the lowest OSNR obtained is 32.5 dB, which is better than that of OSNR obtained under the same conditions. The gain-saturation characteristics of the forward pump are studied in detail. The experimental results show that the saturation power decreases with the increase of the gain, and the increased gain aggravates the gain saturation. For the two-pump forward pump amplifier under study, the saturation Power ~ 5dBm.