The differential group delay (DGD) of the output light which passes through the E-O modulator PMD is estimated and verified by the experimental data.

藉由实验量测到的眼图，我们可以评估光载波经过电光调变器，所产生的群速色散与系统被极化色散现象影响的程度。

Compared with single - ring resonator, the series- coupled multiple- rings structure obviously improved the amplitude response and eliminated the second - order group delay dispersion.

与单环结构相比，不仅幅度特性得到了明显的改善，而且消除了二阶群时延色散效应。