Abstract
In this paper, primary technical challenges for emerging optical mobile backhaul
(MBH) networks are discussed, with a focus on novel optical access and digital signal
processing (DSP) architectures for future MBH. The first downstream/upstream Orthogonal
Frequency Division Multiple Access and Time Division Multiple Access Passive Optical
Network (OFDMA/TDMA-PON) achieving >100 Mb/s per-cell mobile backhaul and burst-mode
operation using off-the-shelf avalanche photodiodes (APDs) is proposed and
experimentally demonstrated for last-mile optical MBH with 200 cells per fiber. In the
new approach, the use of OFDMA is motivated by the capability to establish low latency,
virtual point-to-point links in the frequency-domain to serve high-density cell areas,
while a judicious hybrid of DSP-enhanced digital radio-over-fiber (dRoF) and TDMA is
proposed as an efficient way to meet <1 ms latency constraints subject to a 3 dB
upstream burst-mode dynamic range tolerance. By thus enabling high speed, low latency,
and low cost via simplified optics, the novel OFDMA/TDMA-PON is promising for future 4G
and beyond optical backhaul networks.
© 2012 IEEE
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