Journal of Networks - Academy Publisher

130 JOURNAL OF NETWORKS, VOL. 5, NO. 2, FEBRUARY 2010
Weiershausen, V. Fuerst, N. Cyr, H. Chen, and G.W. Schinn, proposes the use of a new random-scrambling polarization
optical time domain reflectometry (POTDR) measurement technique to investigate the spatial distribution of the
cumulative PMD in deployed fibres. Results help to identify high-PMD fibre pieces or sections which need to be
replaced to enable 40 Gbit/s transmission and beyond, rather than substitution of a whole fibre link. Techno-economical
investigations show the high economic potential of this method leading to significant reduction of expenses for
infrastructure improvements, thus enabling high data rates beyond limitation given by PMD.
The tenth paper on System Impact of Cascaded All-optical Wavelength Conversion of D(Q)PSK Signals in
Transparent Optical Networks by R. Elschner, C.-A. Bunge, and K. Petermann, compares techniques for all-optical
wavelength conversion of differentially phase-modulated signals using four-wave mixing and super-continuum
generation. For the super-continuum generation, a relation between the conversion efficiency and the nonlinear phase
distortion is derived and it is shown that this technique is not suitable for the conversion of phase-modulated signals.
The suppression of Brillouin scattering and its impact on phase-distortions is discussed, and a detailed discussion of its
cascadability in transparent optical networks concludes the paper.
The eleventh paper, On local CAC Schemes for Scalability of High-speed Networks by J. Aracil, J.A. Hernández, A.J.
Elizondo, R. Duque, and O. González de Dios, investigates local CAC (Connection Admission Control) schemes where
the admission decisions are performed at the network edges, based on pre-calculated admission quotas, as opposite to
centralized CAC approaches that could suffer from scalability problems if the number of requests for connections is
excessive.
The twelfth paper on Storage and Mirroring in Single and Dual Section Metro WDM Rings under Different Traffic
Scenarios by T. E.H. El-Gorashi and J. M. H. Elmirghani, introduces a novel data mirroring technique for Storage Area
Networks (SANs) in a metropolitan wavelength division multiplexing (WDM) ring scenario. Performance is evaluated
under two different slot schemes accommodating variable size packet traffic: variable-size (VS) and super-size (SS) slot
schemes.
The thirteenth paper on Optical Code Processing System, Device, and its Application by N. Wada, reports on the
recent progress of optical code processing technology. Ultra-high speed time domain, spectral domain, hybrid domain,
and multiple optical code processing devices and systems are shown. OCDMA-PON, OPS network, and ultra highspeed
optical clock generation are demonstrated.
The fourteenth paper on SLA-Aware Survivability by H. Waldman and D.A.A. Mello, discusses the provision of
differentiated guarantees to a population of users who share a network with different requirements for their connections.
The basic concept underlying the proposed solutions is the required availability of the connections, both in the long
term and during the period covered by the Service Level Agreement. An adequate metric for the latter is provided by
the interval availability. The Authors discuss how Markov chains may be used to model interval availability during the
SLA period.
The fifteenth paper entitled JAVOBS: A Flexible Simulator for OBS Network Architectures by O. Pedrola, M.
Klinkowski, D. Careglio, J. Solé-Pareta, S. Rumley, and Ch. Gaumier, presents a novel Java-based Optical Burst
Switching (OBS) network simulator, JAVOBS. The Authors provide exemplary results that prove its remarkable
flexibility which permits an easy integration of upcoming new network protocol designs.
The Guest Editors are pleased to acknowledge the technical assistance of Mrs. Olga Bolszo at the final editorial stage
of this Special Issue.
Guest Editors:
Marian Marciniak, National Institute of Telecommunications, Poland
Ioannis Tomkos, Athens Information Technology, Greece
Marian Marciniak has been graduated in solid state physics from Marie Curie-Sklodowska University in
Lublin, Poland, in 1977. He received a Ph.D. degree (with distinction) in optoelectronics from Military
University of Technology in Warsaw in 1989, and a Doctor of Sciences degree in physics/optics from
Warsaw University of Technology, Institute of Physics, in 1997.
In 1996 he joined the National Institute of Telecommunications in Warsaw where he actually leads the
Department of Transmission and Optical Technologies. Since 2008 he is a professor at Kielce University of
Technology, Poland. Since 2004 he serves as an Honorary International Advisor to the George Green
Institute for Electromagnetics Research at the University of Nottingham, UK.
His early activities included extended studies of optical waveguiding linear and nonlinear phenomena
with focus on developing original analytic and numerical methods including beam-propagation methods. He
has formulated a theory for mode cut-off conditions in lossy waveguides. He has performed advanced studies of radiation field
propagation in optical waveguides and he has formulated conditions for efficient radiation-to-guided mode conversion. He has
studied extensively the propagation of light in optical waveguides containing simultaneously amplifying and lossy layers and he was
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