Splitters

Optical splitters are used to split the input optical signal into multiple outputs, typically 1x2, 1x4, 1x8, 1x16 up to 1x128. The older of the splitter technologies used is FBT, which is basically welding multiple fibers together.

This process allows the output signal strength ratio to be set for individual fibres, but this is always determined for a specific wavelength, and is also strongly influenced by the ambient temperature. FBT splitters are not suitable for PON networks. 

The more modern PLC technology, although more expensive, offers a uniform signal strength for all outputs in the 1260-1650nm wavelength range and especially for higher split ratios is significantly less.