Public networks for voice, video, and data are using ever more optical fiber. Fiber-based communications networks have clear advantages over 20 media in cost, reliability, and capacity, spurring increased deployment. All public network applications – long-haul trunking, metro rings, and local distribution – are making wide-spread and growing use of fiber. This growth, coupled with the now-common and accelerating use of Dense Wave-Division Multiplexing (DWDM), means that thousands of fibers are terminating in Central Offices (COs) and cable-TV headends.|Public networks for voice, video, and data are using ever more optical fiber. Fiber-based communications networks have clear advantages over 20 media in cost, reliability, and capacity, spurring increased deployment. All public network applications – long-haul trunking, metro rings, and local distribution – are making wide-spread and growing use of fiber. This growth, coupled with the now-common and accelerating use of Dense Wave-Division Multiplexing (DWDM), means that thousands of fibers are terminating in Central Offices (COs) and cable-TV headends.

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