Fiber optic cable was heavily installed as a WAN technology before other technologies emerged. In the case of dark fiber, most of the expense went to the labor involved in its physical installation. Although dark fiber provides high bandwidth, it is currently not used much in modern networks.
Service providers usually implement SONET technology or CWDM/DWDM networks over existing dark fiber infrastructure. This allows end-user enterprises to expand their Ethernet implementations into LANs. This concept of Ethernet over large distances is also known as Metro Ethernet, which led to the creation of Metropolitan Area Networks (MANs).
Coarse Wave . . .
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