Abstract
Orthogonal frequency-division multiplexing (OFDM) passive optical network
(PON) has been considered to be a promising next-generation broadband wired
access solution. However, based on the current tree-based architecture, existing
OFDM PON systems face severe challenges when increasing the scalability and
data-rate performance. In this paper, we propose a high-performance virtual-tree orthogonal frequency-division
multiple access PON system (VTOPS). With the virtual-tree architecture and
coupled with the use of inexpensive direct modulation, VTOPS features high
reliability, scalability, spectrum efficiency, and cost effectiveness all
at once. For governing the flexible/fair access and dynamic allocation of
bandwidth, VTOPS incorporates a rate-based medium access control (MAC) scheme.
The MAC scheme performs dynamic rate adjustment using a neural-fuzzy system.
By adjusting the system parameters, the MAC scheme can achieve a wide range
of delay and fairness performance under a variety of traffic patterns. Finally,
we show both theoretical and experimental results to demonstrate that, by
applying the power pre-emphasis algorithm and adaptive subchannel modulation,
VTOPS achieves 40 Gb/s downlink and 40 Gb/s uplink transmissions, using low-cost
10 GHz directly modulated lasers.
© 2012 IEEE
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