What Is the Difference Between DWDM and CWDM Optical Technologies?

CWDM is a low-cost WDM transmission technology for the metropolitan area network access layer. In principle, CWDM uses optical multiplexers to multiplex optical signals of different wavelengths onto a single fiber for transmission. At the receiving end of the link, the mixed signal in the fiber is decomposed into different wavelengths by means of an optical demultiplexer Signal to the appropriate receiving device.