Today, there is a general consensus that, in the near future, wide area networks
(WAN)(such as, a nation wide backbone network) will be based on Wavelength
Division Multiplexed (WDM) optical networks. One of the main advantages of a WDM
WAN over other optical technologies, such as, Time Division Multiplexed (TDM)
optical networks, is that it allows us to exploit the enormous bandwidth of an optical
fiber (up to 50 terabits bits per second) with requiring electronic devices, which operate
at extremely high speeds.
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