Abstract
In this paper, we propose an energy and cost efficient WDM/OFDMA PON
system, referred to as NEWOPS. Based on a new two-tiered semi-tree architecture,
NEWOPS allows a large number of ONUs to be connected to OLT using only a handful
of colorless transceivers. Due to the architecture, NEWOPS not only facilitates
high spectral efficiency and flexible sub-channel bandwidth allocation, but
also reduces the Rayleigh backscattering (RB) problem and achieves high energy
and cost efficiency. Experimental results demonstrate that, taking only 5-GHz
bandwidth for each wavelength, NEWOPS successfully achieves 20-Gb/s downstream
and 10-Gb/s upstream OFDM-xQAM transmissions via the same fiber trunk. We
depict that, to support 40 ONUs for example, NEWOPS achieves energy efficiency
that is three to six times higher than that of a typical 10-Gb/s WDM/OFDM
PON.
© 2013 IEEE
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