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ccess networks are part of the telecommunica-tions infrastructure that connect individual sub-

Summary: ccess networks are part of the telecommunica-
tions infrastructure that connect individual sub-
scribers to the service provider's central office
(CO) over public ground. They are cost pro-
hibitive and have consistently been regarded as the bottle-
neck, primarily because the ever-growing demand for higher
bandwidth is beyond the supported levels of the widely
deployed access technologies. As illustrated in Table 1, the
typical broadband access connections at home are composed
of at least three phone lines, two high-definition television
(HDTV) channels, and two PC connections for Internet
access [1]. Neither digital subscriber line (DSL) nor cable
modem can successfully meet the bandwidth requirements of
this so-called "telhome" service. Therefore, upgrading access
networks with a low-cost and high-capacity solution is neces-
sary to provide broadband access.
As an inexpensive, simple and scalable technology, passive
optical networks (PONs) are considered a promising solution
to provide various end users with broadband access [2]. As
exemplified in Fig. 1, a PON system is composed of one opti-


Source: Ansari, Nirwan - Department of Electrical and Computer Engineering, New Jersey Institute of Technology


Collections: Engineering