DWDM

Definition: In digital signal processing, DWDM is a technique for increasing the bandwidth of optical network communications. DWDM allows dozens of different data signals to be transmitted simultaneously over a single fiber. To keep the signals distinct, DWDM manipulates wavelengths of light to keep each signal within its own narrow band.

DWDM is a more cost-effective alternative to Time Division Multiplexing (TDM). Electrical engineers often use a motorway analogy to explain the difference between the two. TDM relates to traffic flow on one lane of the motorway. To increase the throughput of autos, one can increase their speed, that is equivalent to time multiplexing. DWDM, on the other hand, relates to the number of lanes on the motorway. Another way to increase auto throughput is to add more travel lanes, that is equivalent to wavelength multiplexing.

Also Known As: Dense Wavelength Division Multiplexing