The nonlinear characteristics of semiconductor optical amplifier (SOA) have important applications for the all-optical switching, wavelength conversion, and optical logic gate.

半导体光放大器（SOA）的非线性特性在光开关、波长变换、光逻辑运算中有重要的应用。

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The third-order nonlinear optical (NLO) response is important in all-optical switching, signal processing, ultrafast optical communications and etc.

三阶非线性光学(nlo)响应对全光开关、光信号处理和超快光通讯具有重要意义。

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Therefore it is a world-wide hot topic and urgent affair to implement all-optical switching and all-optical signal processing in optical network nodes since the beginning of this century.

因此，变革传统的“光-电-光”信息交换方式，在网络节点上实施全光交换和全光信号处理是本世纪以来的全球研究热点，也是当务之急。

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