Optical Networks michelli this textbook sets the standard

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Optical Networks michelli this textbook sets the standardFollowing the emergence of lasers and optical fibers, optical networking made its beginning in the 1970s with high speed LANs MANs. In the 1980s, when the bandwidth of intercity microwave links turned out to be inadequate for digital telephony, the technology for single wavelength optical communications using SONET SDH arrived as a saviour to replace the microwave links. However, single wavelength links couldn't utilize the huge bandwidth (40 THz) of