This means that DWDM uses single mode fiber to carry multiple light waves of different frequencies. Simply explained, DWDM technology is based on the combination and transmission of multiple optical signals, with dedicated wavelengths simultaneously using the same fiber cable. Since its introduction in late 90’s, DWDM has played an important role in optical networking, dramatically increasing data capacity and utilization of the physical fiber. With the latest flexgrid and C+L technology, DWDM systems can carry 30-40 Tb/s across a single fiber pair, depending on the length of the fiber stretch itself. Essentially, DWDM squeezes data traffic into many distinct optical channels, using different wavelength bands, or ‘colors’ of light. The most recent incarnation of this, and the most popular variant today, is known as dense wavelength division multiplexing (DWDM). In order to maximize the transmission capacity of these cable assets, a technology known as wavelength division multiplexing (WDM) was developed. It is for this reason that networks are predominately built using fiber optic cable. Telecommunication networks today employ optical technology to transport the enormous amounts of data we consume, often across large distances. Dense Wavelengths Division Multiplexing (DWDM) is a technology based on optical signals (laser lights) of multiple wavelengths or colors that can be sent through different channels as one signal, significantly improving fiber utilization.
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