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【简答题】
由于光纤的结构及材料等因素使两个偏振模有不同的群速度,出纤后两偏振模的迭加使得信号脉冲展宽,从而形成( ); 偏振的不确定性将对相干通信系统产生影响,因而在相干光波系统中必须使用对偏振不灵敏的相干接收机或采用特别设计的( )光纤。
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