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How to Dense Wave Division Multiplexing (DWDM) differs from the early WDM systems.

  • 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