Abstract
This tutorial paper provides an overview of studies and works to address
the power saving issue in the optical access network (OAN), which typically
comprises passive optical networks (PONs) and Ethernet aggregators (EAs).
First, it describes techniques to reduce the power consumption of the optical
network unit in each subscriber's home. It outlines methods standardized in
ITU-T such as “dozing” and “cyclic sleep,” as well
as elucidating other techniques. Next, power saving at the optical line terminal
(OLT)/EA side is focused. The energy-aware operation of link aggregation and
its application to OAN are described to decrease power consumed by the EAs
used with time-division multiaccess (TDMA) PONs. Finally, a selective OLT
sleep technique is introduced for the next-generation wavelength division
multiplexing (WDM)-TDMA PON with wavelength routing technologies.
© 2012 IEEE
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