The Hybrid WDM/TDM PON, which combines Wavelength-division multiplexing (WDM) with TDM technology, is
presented as a promising solution for the next generation of optical access network. To realize the statistical multiplexing
of upstream wavelength resources, some optical tunable components are introduced in the optical network unit (ONU).
However, switch latency (SL) of these components is an important parameter that will constrain the performance of
Hybrid WDM/TDM PON. In this paper, we for the first time demonstrate and analyze the effect of channel switch
latency (SL) based on the extended WDM IPACT scheme via simulations. The simulation results show that the
performance such as delay, packet lost ratio, queue length and utilization will be constrained by SL, and the
WDM-IPACT-SL can adaptively adjust the channel switch time according to the different SL so as to reduce the
degeneration of the network performance in the practical applications of. Hybrid WDM/TDM PON
We propose a novel multicast-enable wavelength-division-multiplexed (WDM) passive-optical-network (PON)
architecture that uses two sidebands of Optical Carrier Suppressed (OCS)-DPSK signal to carry the unicast and multicast
data. The multicast wavelength control is realized through a Wavelength Selective Switch (WSS). At the optical line
terminal (OLT), for each WDM channel, a single drive Mach-Zehnder modulator (MZM) is used to generate a subcarrier
double-sideband (DSB) DPSK signal. Then, the lower-sideband signals are separated by an interleaver and subsequently
modulated to deliver the multicast data, while the remaining upper-sideband DPSK signals carry the downstream unicast
data. In the optical network units (ONUs), part of the downstream unicast signal power is re-modulated for upstream
transmission, which enables color-free ONUs. This proposed scheme is experimentally demonstrated with a 1.25Gb/s
downstream unicast and multicast data.
We propose a novel scheme to realize unicast and multicast in WDM-PON. Unicast data and multicast data are
modulated in Amplitude Shift Keying (ASK) format and Differential Phase Shift Keying (DPSK) format respectively.
Reflective Semiconductor Optical Amplifier (RSOA) is used to selectively erase the DPSK signal by controlling the
optical switch, and multicast is realized.
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