• Advances in optical amplifiers and lasers allow wavelengths to be more closely spaced



  • This allows multiple signals to be transmitted at the same time along the same fibre at different wavelengths



  • The effect is that one fibre is transformed into multiple virtual fibres



  • And the capacity of each fibre is greatly increased


 
Describe FIVE (5) benefits of using DWDM.

 

  • It allows the network to carry a greater amount of traffic



  • It is protocol and bit-rate independent



  • It can carry different types of traffic at different speeds



  • Creates a lower cost way of meeting customer bandwidth needs and for protocol changes



  • Increases distances between network elements