Photonic Network Communications, 8:1, 5, 2004
# 2004 Kluwer Academic Publishers. Manufactured in The Netherlands.
Alcatel Research and Innovation
Jason P. Jue
The University of Texas at Dallas
The rising demand for high data-rate internet services
is motivating the need for the convergence of data and
voice communication domains in the next-generation
optical internet. A critical issue for the evolution of an
integrated data/voice optical internet is the design of
the control plane. The control plane provides the
intelligence of the optical network, and should be
capable of supporting features such as fast provi-
sioning, protection and restoration, and traf®c
engineering. Such features will enable carriers to
provide new services and to reduce costs.
There has been much recent work to de®ne optical
control plane architectures, such as GMPLS, which
are based on IP-centric protocols. An IP-centric
control plane will reduce many of the complexities
associated with de®ning and maintaining separate IP
and optical layers, and will alleviate concerns such as
interface de®nitions, address assignments and resolu-
tion, internetworking with high-layer traf®c policing
and management, and multi-vendor interoperability.
In this special issue, we present eight articles that
address various aspects of control plane design,
ranging from signaling and routing protocols to
methods for supporting protection and restoration.
The ®rst paper, by Vishal Sharma et al. investigates
the implementation aspects of the peer model in
integrated optical networks, where the operation of
the peer model in both packet and transport domains is
discussed in detail.
The next paper by Dimitri Papadimitriou et al.
discusses the Link Management Protocol and shows
how the protocol ®ts into the GMPLS control plane to
support link auto-discovery and to aid in the establish-
ment of forwarding adjacencies.
The paper by Ralph Martinez et al. provides an
overview of GMPLS in optical networks and presents
an OPNET model for evaluating the performance of a
GMPLS optical switching router.
The fourth article by Ding Zhemin and Mounir
Hamdi proposes a general methodology to integrate
routing, assign wavelengths, and select gateways in a
single routing framework for multi-segment WDM
optical networks. The approach is based on the
Blocking Island paradigm, which provides an abstract
representation of network resources.
The next paper by Guido Maier et al. presents an
algorithm for routing dynamic connection requests in
an optical network that is also supporting high-
priority protected static connections.
The sixth article by Lu Shen et al. studies the
impact of different signaling protocols, such as
hop-by-hop signaling and parallel signaling, which
depend on the optical cross-connect architecture and
the traf®c pattern.
The paper by Zhonghui Yao et al. presents a
signaling scheme for reducing restoration time in an
optical network where backup resources are not
reserved in advance.
The ®nal paper by Fabio Ricciato et al. presents an
architecture and underlying algorithms for supporting
a set of different protection classes in an optical