On the technology side, ATM (Asynchronous Transfer Mode) over SONET have been adopted as the primary transport mechanism for broadband traffic. At present, this traffic is performed in singlemode fiber between the switching centers of up to 40 Gbps.
However, the speed of the fiber can not be increased indefinitely, when the bandwidth required is more than can be supported by a single fiber with multiplexing technique is incorporated in the system, such as TDM and WDM.
There are a number of promising technology of optical fiber communication data. But we need to explore the possibilities and limitations of each technology. These techniques are all-optical network, WDM technologies and wavelength routing.
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