Wavelength-Division Multiplexing Systems
WDM optical networks consist of five main components:
Transmitters
Optical multiplexers and demultiplexers
Amplifiers
Optical-fiber media
Receivers
The various WDM components are integrated to form WDM systems. This section introduces a typical WDM node and then proceeds to explain the various subsystems and their relevant technologies in greater detail. As illustrated in Figure 4-8, a WDM node consists of a multiplexer-demultiplexer section, a switching section, and a local interface section. The local interface section consists of transponders, which are further broken down into optical sources, optical detectors, and complex electronic circuitry. The multiplexer and demultiplexer sections consist of optical ...
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