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How to Wavelength Division Multiplexing (WDM) operates.

  • Wavelength Division Multiplexing allows two or more optical systems to operate over the same fibre
  • It uses light of different wavelengths or coloured laser light, thus effectively increasing the capacity of the fibre
  • The technique can be likened to Frequency Division Multiplexing in that separating optical wavelengths (colours) is little different from separating the frequencies of electrical signals
  • In order to work filters are used to pass the required wavelength, while blocking others
  • y using WDM it is possible to increased the capacity of a pair of fibres (one for transmit, one for receive) from 140Mbits/s to Gigabits or even Terabits/s