一.WDM technology has the following characteristics:

Large capacity

The bandwidth can be transmitted by ordinary fiber currently used is very wide, but its utilization rate is still very low. Using DWDM technology​ can increase the transmission capacity of a fiber by several times, dozens of times, or hundreds of times compared with the single wave length transmission capacity.

二，"Transparent" transmission of data

Because the DWDM system is reused and reused according to the different light wavelength, it has nothing to do with the rate and electrical modulation method of the signal, that is, the data of the data is "transparent". Such as ATM, IP or signals that may appear in the future. The wave duplication system completes transparent transmission. For the "business" layer signal, each optical wave length channel in the wave duplication system is like "virtual" fiber.

三.High degree of network flexibility, economy and reliability

The new type of communication network composed of WDM technology is greatly simplified than the network structure composed of traditional electricity, and the network level is clear. The scheduling of various businesses only needs to adjust the wavelength of the corresponding light signal to achieve. Due to the simplified network structure, clear hierarchy, and convenient business scheduling, the flexibility, economy and reliability of the network brought by it are obvious.