CWDM – Coarse Wavelength Division Multiplexing (from Coarse Wavelength Division Multiplexing) is a multiplexing technology that enables a lot more effective use the optical data transmission tool (optical fiber), by using numerous “light” bands as independent details transmission channels within one optical fiber. fibers.
A CWDM filter is attached per side of the optical fiber, which integrates (” packs”) numerous spectra in one direction and also separates (” unpacks”) these ranges on the reverse side, presenting each of them in a different “color window” corresponding to its wavelength.
About speaking, a great deal of fibers enter the filter at the input, and also at the outcome there are 1-2 fibers as well as at the other end these 1-2 fibers are additionally connected through the filter to a multitude of fibers and also we can somewhat say that CWDM is an innovation fiber-to-fiber compaction. Because of this, each of the “color” CWDM varieties can be made use of as an independent info provider within a single optical fiber.
In order for CWDM innovation of multiplexing optical communication channels to function, CWDM filters alone are not nearly enough, special CWDM transceivers (CWDM: SFP/ SFP+/ XFP) are additionally called for, with the ability of creating a light signal of the required wavelength. Radio and also TV broadcasting services a comparable concept, making use of different frequency networks. The denser you can utilize the networks, the much more successfully you can utilize the data transmission tool.
The following step in the multiplexing of optical communication channels was the innovation of deep multiplexing/ multiplexing of optical interaction signals – DWDM modern technology.
More clearly, the principle of operation of CWDM modern technology is shown on a circuit representation for linking a pair of optical CWDM filters for 16 wavelengths