As the key device of a DWDM system,Etching Diffraction Grating (EDG) is one of the most potential types of planar waveguide DWDM devices.是什么意思_As the key device of a DWDM system,Etching Diffraction Grating (EDG) is one of the most potential types of planar waveguide DWDM devices.在线翻译_英语_读音_用法_例句