Optical networks use fibre optic cables to transmit large quantities of data for internet and communication networks. It is preferred because it is capable of achieving very high bandwidths. System and power supply cooling is often provided by central fan assemblies rather than relying on upon multitude of smaller internal fans.

As the TDK-Lambda PFE series of AC-DC power modules utilises baseplate cooling, a manufacturer of optical networks was able to integrate the product into their air-cooled system with the use of a heat sink. By using the new higher efficiency PFE500SA-48 version, the size of the heat sink could be reduced as less waste heat was produced.