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本文首先给出正规化横方向位相常数和正规化横向衰减常数与归一化频率的关系.然后给出群速度,求出群延迟,群延迟包括二部份,一部份为材料延迟,一部份为波导延迟.最后推出波导延迟和模式的关系.得出多模波导脉冲畸变主要是模式不同的群延迟造成的.
In this paper, firstly, we give the relationship between normalized transverse phase constant and normalized transverse attenuation constant and normalized frequency.Furthermore, the group velocity is given and the group delay is obtained. The group delay includes two parts, one is the material delay, Part of the waveguides delay.Finally, the relationship between waveguides delay and mode is introduced.It is concluded that the multi-mode waveguide pulse distortions are mainly caused by the group delay with different modes.