A new magnetic field measurement based on the Faraday effect and the measurement of differential group delay (DGD) in fiber grating was proposed.

提出了一种利用光纤光栅中法拉第效应和测量差分群时延(DGD)的直接测量磁感应强度的新方法，给出了理论分析和实验结果。

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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。

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The difficulty of solving PMD lies in its randomness of differential group delay (DGD) between the principal states of polarization (PSP) and the change.

PMD问题的最大困难在于差分群延迟(DGD)和偏振主态(PSP)变化的随机性。

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But Thomas Davidoff, assistant professor at the Haas Real Estate Group at the University of California, Berkeley, says the differential between high and low rents in California is much less dramatic than in New York.

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