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Wavelength Division Multiplexing (WDM) is a way to fully utilise the vast transmission capacity of an optical fibre beyond simply increasing bandwidth. In WDM systems, multiple transmitters, each at a different wavelength, are combined onto a single fibre by a multiplexer (Mux). At the far end, a de-multiplexer (DeMux) separates the wavelengths into separate fibres to separate receivers. In this way, multiple signals ‘share’ the same fibre.

Today’s ‘Dense’ WDM (DWDM) systems use wavelengths which are very closely spaced in the 1550nm range.

DWDM technology provides the best and most economical way to achieve potentially unlimited transmission capacity. As your demands change, you can add more capacity by simply increasing the number of lambdas on the fibre, without the need for expensive upgrades.