Abstract
A novel broadcast/multicast-capable
carrier-reuse WDM-PON architecture is proposed.
Utilizing the splitting capability of a power splitter
and the cyclic property of an arrayed waveguide grating
(AWG) at the remote node, the broadcast channel and a
dedicated downlink unicast channel can be overlaid and
subsequently transmitted to each optical network unit
(ONU) simultaneously. Since each ONU can receive a
common broadcast channel with electronically coded
information, the multicast function can be implemented
in a higher layer, similar to the current
multicast-capable E-PON or G-PON using IP multicast
addresses through a single wavelength channel. Thus,
there is no need for reconfiguration of physical
connections for multicast services. The proposed
approach is different from the approach of overlaying
DPSK multicast data onto NRZ unicast data using the same
wavelength. As such, this approach does not require an
expensive DPSK receiver at each ONU, and high receiver
sensitivity can be achieved since there is no need to
restrict the extinction ratio (ER) of the NRZ unicast
data to a small value. Simulation studies show that this
WDM-PON provides acceptable performance with one 10 Gb/s
broadcast channel and thirty-two 10 Gb/s downlink
unicast channels, and thirty-two 2.5 Gb/s uplink unicast
channels. Another advantage of this WDM-PON is that the
broadcast channel only causes a small interference with
the downlink/uplink unicast channels, and it is shared
by all the ONUs. The effect of the optical carrier to
subcarrier ratio on the bit error rate performance can
be mitigated by increasing the extinction ratio of the
delay interferometer used at the remote node.
© 2011 IEEE
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