光纤传输系统中互相位调制和受激拉曼散射串扰噪声的比较研究Ⅱ——级联传输系统

Comparative Study of XPM-and SRS-Induced Crosstalk in Optical Fiber Transmission SystemsⅡ——Cascaded Transmission System

在具有级联光放大器的密集波分复用强度调制直接检测光纤系统中 ,导出了包含互相位调制和受激拉曼散射共同作用的强度 /相位矩阵表达式。在计算强度噪声谱的基础上 ,研究了互相位调制和受激拉曼散射的相互耦合并用于密集波分复用系统的噪声分析。在带色散补偿的密集波分复用级联光纤传输系统中 (如 80信道 ,信道间距 5 0GHz) ,受激拉曼散射引入的串扰噪声功率可能超过互相位调制。最后 ,给出了密集波分复用系统分析与设计的若干建议。

Intensity/phase transfer matrices are derived to characterize both cross phase modulation (XPM) and Stimulated Raman Scattering (SRS) in cascaded IM DD optical fiber transmission systems. Based on the calculation of intensity noise spectrum, comparative study of XPM and SRS induced crosstalk is performed analytically and numerically. Analysis reveals that SRS and XPM leads mainly to low frequency and high\|frequency noise, respectively; crosstalk from adjacent channels is mainly attributed to XPM while that from channels afar mainly attributed to SRS; in cascaded transmission systems, crosstalk noise power from SRS may even exceed that from XPM. Finally, some suggestions are proposed for the design and analysis of DWDM systems.