光纤基质材料决定了铒离子周围的配位场特性,并决定了铒离子的吸收谱和发射谱的展宽特性.分析了发射谱线宽度对4f壳层电子相关性、电子偶极—偶极相互作用及共振增强非线性的影响.以石英硅和碲化物为基质的掺铒光纤具有不同的发射谱宽,对应着不同程度的共振增强非线性.文中用半经典理论分析比较了这两种光纤中由于四波混频和互相位调制引起的串扰.结果显示,相比于掺铒石英硅光纤,掺铒碲化物光纤具有更小的串扰,更适合于密集波分复用系统.
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