Dense wavelength division multiplexing (DWDM) employs multiple light wavelengths to transmit signals over a single optical fiber. Today, DWDM is a crucial component of optical networks because it maximizes the use of installed fiber cable and allows new services to be quickly and easily provisioned over existing infrastructure. Flexible add/drop modules allow individual channels to be dropped and inserted along a route. An open-architecture system allows a variety of devices to be connected, including SONET terminals, ATM switches, and IP routers.
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