Abstract
Passive Optical Networks (PONs) are access networks which use interconnected optical fibers configured in a point to multipoint star topology having only passive optical components between the Optical Line Terminal (OLT) and the Optical Network Unit (ONU). As a strategy for technological evolution they can be used to take advantage of copper and coax base cables installed in the access network, serving as a feeder cable for the use of DSL, Cable Modem and LMDS technologies, in order to allow optical fibers to reach customers` facilities. The main merit of the Passive Optical Networks architecture consists on the cost reduction involved on its implantation and maintenance, offering bandwidth enlargement without increasing the number of active optical components, such as lasers and optical amplifiers, in the network. In this context, this text defines PONs, presents its development history, operation principle and their applications as a way to provide broadband access services, identifies suppliers for field test implementation and discusses the perspectives for the future.
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