DWDM (dense wavelength division multiplexing) combines multiple wavelengths into a single optical fiber and supports long haul, metro and DCI applications with high capacities of 100G/200G/400G over a single wavelength. DWDM enables better fiber utilization, as it increases fiber capacity by a factor of 16-96 and enables building effective optical networks. In WDM technology, each channel is transparent to the speed and type of data, and any mix of Ethernet, SAN, OTN, SONET/SDH and native video services can be transmitted simultaneously over a single fiber or fiber pair. One of the advantages of DWDM is the use of optical amplifiers, which can amplify the entire DWDM spectrum and overcome long spans of attenuation and fiber loss, enabling cost-effective transmission over long distance. Its ability to handle large capacity of data makes DWDM the preferred solution for many industries and organizations running a fiber optical network.