We introduce a model of random birefringent single mode fibers , and the general nonlinear propagation equations of dual - lightwaves in random birefringent fibers are deduced . the characteristics of polarization mode dispersion in 2 + 10gb / swdm system is studied . it is found that pmd in wdm system can be effectively suppressed by the synchronous modulation technique 我們引入了隨機擾動雙折射單模光纖模型,導出了雙波長的光波在隨機雙折射光纖中的非線性脈沖傳輸方程;在此基礎上,研究了偏振模色散對2 10gb swdm系統(tǒng)中脈沖序列傳輸的影響,并采用同步幅度調制控制技術有效地降低了偏振模色散的影響。