Title :
An Energy and Cost Efficient WDM/OFDMA PON System: Design and Demonstration
Author :
Yuang, Maria ; Dar-Zu Hsu ; Po-Lung Tien ; Hsing-Yu Chen ; Chia-Chien Wei ; Shin-Hao Chen ; Jyehong Chen
Author_Institution :
Dept. of Comput. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan
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.
Keywords :
OFDM modulation; Rayleigh scattering; backscatter; bandwidth allocation; channel allocation; frequency division multiple access; optical design techniques; optical transceivers; passive optical networks; quadrature amplitude modulation; trees (mathematics); wavelength division multiplexing; NEWOPS; OLT; ONU; RB problem; Rayleigh backscattering; bit rate 10 Gbit/s; bit rate 20 Gbit/s; colorless transceivers; cost efficient WDM-OFDMA PON system; downstream OFDM-xQAM transmission; energy efficient WDM-OFDMA PON system; fiber trunk; flexible subchannel bandwidth allocation; frequency 5 GHz; optical line terminal; spectral efficiency; two-tiered semitree architecture; upstream OFDM-xQAM transmission; OFDM; Optical attenuators; Optical network units; Optical receivers; Passive optical networks; Transceivers; Wavelength division multiplexing; Energy efficiency; Orthogonal Frequency Division Multiple Access (OFDMA); Passive Optical Network (PON);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2273932
