Multiwavelength technology for local loop applications

Some of the possible options for the exploitation of wavelength division multiplexing (WDM) techniques in the local loop are illustrated. It is noted that few-wavelength systems will probably be the first systems to be exploited, and early practical realizations are discussed. It is further suggested that the fuller exploitation of the optical spectrum available will be via much more extensive high-density WDM. Techniques are described showing that these opportunities could rapidly follow from few-wavelength systems