The true potential of optical fiber is fully exploited when multiple beams of light atdifferent frequencies are transmitted on the same fiber. This is a form of frequencydivision multiplexing (FDM) but is commonly called wavelength division multiplexing(WDM). With WDM, the light streaming through the fiber consists of many colors,or wavelengths, each carrying a separate channel of data. In 1997, a landmarkwas reached when Bell Laboratories was able to demonstrate a WDM system with100 beams each operating at 10 Gbps, for a total data rate of 1 trillion bits per second
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