Review and status of wavelength-division-multiplexing technology and its application

The application of state-of-the-art Wavelength Division Multiplexing (WDM) technology to communications systems will enhance flexibility and cost effectiveness. Although steady progress is noted in optical multiplexing devices, light sources, and detectors, this technology is in its infancy, and it is suggested that priority be given by researchers to WDM device cost reduction. WDM application to multiservice broadband subscriber networks is especially promising. Attention is given to angularly dispersive devices, dielectric thin film filter-type devices, hybrid and planar waveguide-type devices, active WDM devices, and wavelength-nonselective devices.