周期色散管理波分复用系统中交叉相位调制边带不稳定性理论分析

Theoretical analysis of cross-phase modulational sideband instability in wavelength-division multiplexed system with periodic dispersion managed fiber links

色散管理是在波分复用系统中,周期地使用色散符号相反的光纤,使总的路径平均色散系数接近于零,系统中的色散就得到了补偿的一种技术.研究了波分复用集总放大色散管理系统中交叉相位调制的不稳定性,解析和数值研究表明,当路经平均色散系数表现为反常色散时,存在多阶边带;当路经平均色散系数表现为正常色散时,解析研究表明只存在最低阶边带,数值模拟显示噪声谱中最低阶边带噪声谱功率最强,解析和数值研究得到的结论一致.

Dispersion management is a technology that alternately and periodically uses fibers with opposite dispersion sign in wavelength-division multiplexing link, thus the path averaged dispersion coefficient over each period is close to zero. This paper studies the cross-phase modulational sideband instability in chain of periodic dispersion managed and lumped amplified fiber link. Analytisis and numerical simulation are applied to show that there are multi-sidebands in the dispersion managed fiber link if the path averaged dispersion exhibits the abnormal dispersion, while there is only the lowest order if the path averaged dispersion exhibits the normal dispersion. The results of analytical and numerical simulation methods are consistent.