Dwdm definitions

An optical multiplexing technique defined in ITU-T Recommendations G.692 and G.959.1 as supporting eight or more wavelengths in the 1530
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(Dense WDM) The term given to wavelength division multiplexing (WDM) when significantly more channels were being added. Since WDM is increasingly more "dense" all the time, both terms are used synonymously. See WDM.
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