第二 种传输损害是相位延迟畸变(Delay Distortion), 它是指数字信号的各种频率成分 到达接收端的延迟不一样，导致接收信号时产生码间干扰，增加误码率。
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得出多模波导脉冲畸变主要是模式不同的群延迟造成的。
It results that the pulse deformation is caused by group delay of different modes.
六种主要的失真形式为：偏置、特征、 延迟、终止、畸变（跳动）和谐波。
The six major forms of distortion are: bias, characteristic, delay, end, fortuitous("jitter"), and harmonic.
脉冲延迟量和超前量比损耗系统大，可用于光速控制，克服了微环带有损耗时产生的光强损耗和脉冲畸变。
These results show that the resonator with gain can be used to control the speed of light and to overcome the pulse loss and distortion in dissipative resonators.
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