The WDM components making up a WDM system should meet the following requirements .（）

A.插入损耗低 Low insertion loss
B.具有良好的带通特性 Excellent bandpass property
C.温度稳定性好 Performance stability in spite of temperature change
D.复用通路数多A number of multiplexing channels
E.具有较高的分辨率 High resolution
F.几何尺寸小 Small size