Performance improvement over existing on-off keyed systems is conservatively stated as 4X with the opportunity for further expansion. In metro networks, traffic patterns change rapidly and require dynamic reconfiguration. Inexpensive solutions for very short reach and gigabit Ethernet often use signal-distorting multimode fiber. The xDSM waveform is composed of multiple narrowband subcarrier signals that are less sensitive to channel impairments. It is possible to provision xDSM waveforms on any or all of the wavelengths of a DWDM network.
Greater reach is achieved on dispersion-limited channels.
While xDSM technology has great potential, risk factors exist that may limit product performance and broad market acceptance. Trade-offs among cost, size, performance, and power requirements will continue throughout the product development cycle. Critical technology development is ongoing for fast data conversion, advanced digital signal processing architectures, and system dynamic range, company officials added. Copyright 2001 INT Media Group, Incorporated All Rights Reserved.