Dense wavelength division multiplexing (DWDM) is a technology that puts data from different sources together on an optical fibre, with each signal carried at the same time on its own separate light wavelength.
Two or more optical frequencies(colors) are use on the same fiber.
A technique of sending signals of several different wavelengths of light into the fiber simultaneously.
A way of increasing the information-carrying capacity of an optical fiber by simultaneously operating at more than one wavelength. With WDM you can multiplex signals by transmitting them at different wavelengths through the same fiber.