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PRESENT AND EXPECTED future consumer data demands continue to push the need for increased bandwidth. In optical systems, the use of different wavelengths for multiple signals in a common fiber is essentially the basis for DWDM. Of course, the optical-communications technique is somewhat more complicated than that simple explanation, and those wishing to know more are advised to refer to DWDM Fundamentals, Components, and Applications by Jean-Pierre Laude. The author holds more than 50 patents, an engineering degree in optics from the Ecole Superieure d'Optique de Paris, and a Ph.D. in spectroscopy from the University of Paris at Orsay.