Abstract
We propose a delay-based multicast overlay scheme to superimpose a
multicast differential phase-shift keying (DPSK) modulated signal on a
point-to-point downstream inverse-return-to-zero (IRZ) modulated signal in a
wavelength-division-multiplexed passive optical network (WDM-PON). By
adjusting the synchronization of the DPSK and the IRZ modulation on the
downstream carrier, simple and flexible multicast control could be realized.
We have successfully demonstrated the proposed scheme for three different
traffics, namely 10-Gb/s IRZ downstream point-to-point data, 10-Gb/s DPSK
downstream multicast data, and 10-Gb/s non-return-to-zero (NRZ) upstream
re-modulated data, respectively. An error floor of $10^{-4}$ is observed for the multicast data when it is disabled. The
effect of timing misalignment on the downstream DPSK/IRZ orthogonal
modulation and the upstream re-modulation is analyzed. We also study the
case when the data rates of the multicast and downstream point-to-point data
are different.
© 2010 IEEE
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