Dispersion compensation module abbreviation DCM, definition: a module for dispersion compensation

In the field of optical fiber communication, the dispersion compensation module (DCM) (also known as the dispersion compensation unit, DCU) is used to compensate for the dispersion, for example, to compensate for the dispersion in a long transmission fiber.

Usually, this module provides a certain degree of dispersion (for example, providing normal dispersion in the 1600nm spectral region), of course, there are also modules with tunable dispersion. Inserting the module into the fiber optic link is very simple because there are optical connectors at the input and output ends.

Fiber amplifiers can be used to compensate for insertion loss. For example, erbium-doped fiber amplifiers can be used in 1500nm communication systems. The dispersion compensation module is usually placed between two amplifiers.