中文摘要：

3R（re-amplification，re-shaping，re-timing）再生是高速率光纤通信系统的一个关键技术。为科学评价3R系统的再生能力，对基于色散位移光纤（DSF）中的四波混频（FWM）效应的全光3R系统的性能进行了测试，得到了输入一输出信号Q值的特性曲线，由此可以得到3R再生系统的再生范围（可再生输入信号的最小输入Q值和最大输出Q值）、最大再生能力等信息，从而达到合理地在线路中设置3R再生系统。结果表明，对于此全光3R再生系统，对输入Q值在2．6～5．8的恶化信号具有再生能力，并且在输入信噪比（SNR）为3．2时可以得到最大的sNR改善为1．1。

英文摘要：

The 3R （re-amplification, re-shaping, re-timing） regeneration is one of the key technologies for the high speed optical communication systems. How to set the 3R regeneration system in the transmis- sion line more reasonably and more efficiently might need to be solved in the high-speed system. There is a regenerative capacity for any regeneration system,and the regenerative capacity varies with input sig- nals. So for the signal with a specific deterioration,testing the regenration effect cannot describe the re- generation capacity of the 3R system. Changing the deterioraton of the input signal, we can get the regen- erative capacity of the 3R regeneration system,which is decided by the minimum input Q value and the maximum input Q value, and the maximum regenerative capacity. In this paper, the regenerative curve for a 40 Gbit/s 3R regeneration system is shown,which is based on four-wave mixing in a dispersion shifted fiber （DSF）. This all-optical 3R regeneration system can regenerate the degraded signals with a Q value ranging from 2.6 to 5.8. The maximum improvement of the signal to noise ratio （SNR） is 1.1 when the input SNR is 3.2.