Abstract
In this paper, we evaluate the design and performance of an entirely passive
extended 10-gigabit-capable PON (XG-PON) using eight channels of coarse
wavelength-division multiplexing (CWDM) in upstream transmission, which is called the
Cu-XG-PON, with a first demonstration of the upstream physical layer specification for
the extended class in ITU-T G.987 series of recommendations. In the new scheme, a single
burst-mode receiver (BMRx) within an optical line terminal (OLT) receives arbitrary
upstream data from the optical network terminals (ONTs) divided into eight groups, each
group sharing a CWDM wavelength, through a CWDM filter and a power splitter as cascaded
remote nodes (RNs) for the upstream link bridge. The downstream link is designed such
that a high power OLT transmitter compensates for link loss using two power splitters as
cascaded RNs. Based on the proposed architecture, we first analyze the overall system
performance in the upstream and downstream links, and then evaluate the practical
extension capabilities in terms of fiber distance and split ratio by conducting
experiments to probe the upstream performance using a developed BMRx. We demonstrate
that the BMRx is capable to -34.5 dBm sensitivity, which is feasible for a 36 dB
optical path loss and a 0.5 dB optical path penalty with a 2 dBm ONT transmitter power.
Based on the numerical analysis and experimental results, we confirm that the proposed
Cu-XG-PON is capable of reaching 28 km for 256 ONTs, or 42 km for 64 ONTs, and
furthermore, for ONT groups at long wavelength channels, maximum 40 km for 256 ONTs, or
60 km for 64 ONTs.
© 2012 IEEE
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