Compared with the traditional way of TDM, CWDM SFP has rate and protocol transparency, which make it more adapt to the development of metropolitan area network high-speed data services.Man, there are many different protocols and different rates in the business, CWDM provides provide different rates on a single fiber, the agreement transparent transmission channel, such as Ethernet and ATM, POS, SDH, and transparency of CWDM and transplanting multiplexing function can allow users to directly and with a certain wavelength, without having to convert the format of the original signal.That is to say, the light layer provides independent of business transfer of a structure.

CWDM have good flexibility and extensibility.For metropolitan area business, business to provide flexibility, especially in business's ability to provide speed and extend as business development is very important.Using CWDM technology can be in 1 day or a few hours for the user to open the business, but also with the increase of business volume, can by inserting a new OTU plate for capacity expansion.Improve the quality of the business.Applied in the metropolitan area network CWDM systems can make the light layer recovery is possible.Optical layer recovery than electricity recovery is much more economic.Considering the optical layer is independent of the business and the rate of recovery, then the original some system without protection system from the body (e.g., gigabit Ethernet), the CWDM may be used for protection.

Because of the advantages of the technology of CWDM CWDM SFP in areas such as telecommunications, radio and television, enterprise network, campus network to obtain more and more applications