This article will include these subject. What does WDM stand for? The basic structure of WDM system Advantages of WDM technology What does Mux and Demux stand for? The difference between WDM and optical splitter The indicators that affect the WDM devices How to understand the O, E, S, C, L, U band What does CWDM stand for vs. DWDM, FWDM, LWDM, MWDM? HYC can provide customers with a one-stop optical network device and low-cost optical communication products, supplying a range of WDM products. HYC Co.,Ltd（HYC）is a national Hi-tech optoelectronics company engaged in R&D, manufacture and marketing of fiber optical products. Providing professional product and service for fiber connectivity,WDM, PLC splitter and high density datacom cabling. HYC products and solutions widely applied in 4G/5G, Data Center and Cloud Computing industry etc.