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With the development of the optical communication industry,new technology and cost-saving solutions are derived.Such as the widely used of CWDM and DWD.Today we learned about CWDM and DWDM. CWDM is a low-cost WDM transmission technology face to the access layer of metropolitan area network.Saving fiber resources and networking cost.It solves two problems:1.The shortage of optical fiber; 2.Multiser...
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