• 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