WDM especially DWDM is widely used in long haul network because it can extremely expand the band, however in short haul area CWDM is paid attention to be cause its properties.
波分复用尤其是DWDM技术能极大拓展带宽，在长途干线上得到广泛应用，而在短距离传输中，CWDM由于其一系列特点已越来越引起人们的重视。
WDM especially DWDM is widely used in long haul network because it can extremely expand the band, however in short haul area CWDM is paid attention to be cause its properties.
波分复用尤其是DWDM技术能极大拓展带宽，在长途干线上得到广泛应用，而在短距离传输中，CWDM由于其一系列特点已越来越引起人们的重视。
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