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密集波分复用（DWDM）系统能满足对光纤干线传输容量日益增长的需求，其近期研究活动已转向太比特的传输[1]。为了增加此系统的总容量和传输距离，必须研究克服各种限制的技术。图1示出关于提高密集波分复用系统三个重要参数性能有希望的技术，这三个参数是光谱效率、带宽利用
Dense Wavelength Division Multiplexing (DWDM) systems can meet the growing demand for fiber trunk transmission capacity, and recent research efforts have shifted to terabit transmission [1]. In order to increase the total capacity and transmission distance of this system, it is necessary to study technologies that overcome various limitations. Figure 1 shows promising techniques for improving the performance of three important parameters of a DWDM system: spectral efficiency, bandwidth utilization