Abstract
A new all-optical access–metro network interface based on optical burst switching (OBS) is proposed. A
hybrid wavelength-division multiplexing/time-division multiplexing (WDM/TDM) access architecture with reflective
optical network units (ONUs), an arrayed-waveguide-grating outside plant, and a tunable laser stack at the optical
line terminal (OLT) is presented as a solution for the passive optical network. By means of OBS and a dynamic
bandwidth allocation (DBA) protocol, which polls the ONUs, the available access bandwidth is managed. All the
network intelligence and costly equipment is located at the OLT, where the DBA module is centrally implemented,
providing quality of service (QoS). To scale this access network, an optical cross connect (OXC) is then used to
attain a large number of ONUs by the same OLT. The hybrid WDM/TDM structure is also extended toward the metropolitan
area network (MAN) by introducing the concept of OBS multiplexer (OBS-M). The network element OBS-M bridges the MAN
and access networks by offering all-optical cross connection, wavelength conversion, and data signaling. The
proposed innovative OBS-M node yields a full optical data network, interfacing access and metro with a
geographically distributed access control. The resulting novel access–metro architectures are nonblocking and,
with an improved signaling, provide QoS, scalability, and very low latency. Finally, numerical analysis and
simulations demonstrate the traffic performance of the proposed access scheme and all-optical access–metro
interface and architectures.
© 2007 IEEE
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