Short Wave Division Multiplexing
Instead of using one wavelength, 4 different wavelengths are transmitted down a fiber at the same time meaning a four fold increase. By having four sets of matched transmitters and receivers per channel, all using a different fixed range of wavelengths, the potential to go faster becomes a reality,
![SP3351_large](https://wiki.commscopetraining.com/wp-content/uploads/2018/10/SP3351_large-2-150x150.png)