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differential group delay : ウィキペディア英語版
differential group delay

In optics, differential group delay is the difference in propagation time between the two eigenmodes ''X'' and ''Y'' polarizations. Consider two eigenmodes that are the 0° and 90° linear polarization states. If the state of polarization of the input signal is the linear state at 45° between the two eigenmodes, the input signal is divided equally into the two eigenmodes. The power of the transmitted signal ''E''''T'',total is the combination of the transmitted signals of both ''x'' and ''y'' modes.
: E_T = (E_ \cdot t_x)^2 + (E_ \cdot t_y)^2 \,
The differential group delay ''D''''t'' is defined as the difference in propagation time between the eigenmodes: ''D''''t'' = |''t''''t'',''x'' − ''t''''t'',''y''|.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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