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.Multiservice transparent transmission.Can build the network and conduct business in a short time.

Advantages of CWDM:
※The most important is that the cost of the equipment is low.
※ Can reduce the operating costs of Network.
※Can significantly improve the transmission capacity of optical fiber, improve the utilization of fiber resources.
※ Small size and low power consumption.
※ Good flexibility and extendibility.

DWDM can combine and transmit different wavelengths at the same time in the same optical fiber.To ensure the efficiency, one optical fiber is converted into a plurality of virtual optical fibers. The application forms of DWDM:open DWDM and integrated DWDM.

Advantages of DWDM:
※Its protocol and transmission speed is irrelevant.
※The OMU and ODU of integrated DWDM are respectively used at the transmitter and the receiver
※ The structure of integrated DWDM is simple and smaller,only about one-fifth of the open DWDM, save room resources
※ Integrated DWDM only use passive components at the transmitter and the receiver(eg:OMU or ODU).Telecom operation unit can order directly from manufacturers to reduce the supply chain,lower costs, save equipment costs.

3) The using environment of device is different.CWDM is mainly used in the convergence layer and access layer;DWDM is used in railway communication work environment.

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