Guest Editorial
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| Title | Guest Editorial |
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| Abstract | The development of the transparent optical-fiber based transmission and networking have revolutionized modern telecommunications and consequently have influenced dramatically the working methods and everyday life of the societies and individuals. The excellent progress with that is reviewed and reported in this Special Issue on Transparent Optical Networking which contains fifteen carefully selected papers based on the contributions to the 10th Anniversary International Conference on Transparent Optical Networks ICTON 2008, Athens, Greece, June 22-26, 2008, www.itl.waw.pl/icton . ICTON is receiving technical co-sponsorship by the IEEE Photonics Society (formerly LEOS).All papers in this Special Issue have been submitted by Editors’ invitations.The first paper entitled Control and Management Issues in All-Optical Networks by R. Rejeb, M.S. Leeson, C. M. Machuca, and I. Tomkos, introduces a management system for ensuring the secure and continued functioning of the network.The second paper on Optical Transmission of OFDM Ultra-wideband Signals beyond 40 Gb/s by Y. Ben-Ezra, M. Ran, B.I. Lembrikov, U. Mahlab, M. Haridim, A. Leibovich, proposes for the first time the highly efficient method of RF and optical signal mixing based on two different architectures: the parallel-RF/serial-optics architecture characterized by all-optical mixing for sub-carrier multiplexing, and the parallel-RF/parallel-optics architecture based on the array of 12x10 GHz components with directly modulated VCSELs and 12 multimode optical fibers. The third paper on Characterization of Wavelength Tunable Lasers for Future Optical Communication Systems by P. M. Anandarajah, A. Kaszubowska-Anandarajah, R. Maher, K. Shi and L. P. Barry, investigates the possibility of using tunable lasers (TLs) in DWDM wavelength packet switched networks by focusing on the characterisation of the instantaneous frequency drift of a TL due to wavelength tuning and direct modulation. Characterization of the line-width of the TLs is presented to verify the feasibility of using TLs in systems employing advanced modulation formats.The fourth paper on Signal Processing Algorithms in 100Gbit/s Optical Coherent and Non-coherent Receivers with PSK Modulation by Ch. Hebebrand and W. Rosenkranz, addresses multi-level PSK modulation formats with coherent and non-coherent detection, and reviews signal processing algorithms like mitigation of phase noise, the clock and carrier recovery algorithms as well as the equalizer structures and their performance. The fifth paper entitled A New All-Optical Switching Node Including Virtual Memory and Synchronizer by S. Batti, M. Zghal, and N. Boudriga, presents an architecture for an all optical switching node suitable for optical packet and optical burst switching which provides appropriate contention resolution schemes and QoS guarantees. A new concept of a ‘virtual memory’ is developed to allow controllable and reasonable periods for delaying optical traffics. Implementation issues are discussed, and the implementation and performance of an all-optical synchronizer able to synchronize arriving data units to be aligned on the clock signal associated with the beginning time of slots in the node with an acceptable error is reported.The sixth paper entitled Electronic Predistortion for Compensation of Fiber Transmission Impairments - Theory and Complexity Considerations by S. Hellerbrand and N. Hanik, revises principles of electronic pre-distortion technique to combat transmission impairments on fiber-optic communication links, and different methods to implement this method are explained. The Authors focus on the implementation complexity of this scheme and they highlight how the complexity scales for increasing channel data rates.The seventh paper on Photonic Routing Systems Using All-optical, Hybrid Integrated Wavelength Converter Arrays by L. Stampoulidis, E. Kehayas, P. Bakopoulos, D. Apostolopoulos, P.Zakynthinos, D. Petrantonakis, H. Avramopoulos, A. Poustie, and G. Maxwell, presents the realization of demanding functionalities required in high-capacity photonic routers using compact and multi-functional photonic processing components including: clock recovery, data/label recovery, wavelength routing and contention resolution; all implemented with multi-signal processing using a single photonic chip – a quadruple array of SOA - MZI wavelength converters with a chip area of only 15 x 58 mm2. The capability of this technology to build WDM signal processing systems with the simultaneous operation in a four wavelength burst-mode regenerator is presented, and the potential to provide photonic on-chip systems is demonstrated with the first hybrid integrated all-optical burst-mode receiver prototype.The eighth paper on Efficient Signal Processing in OFDM-based Indoor Optical Wireless Links by J. Grubor and K.-D. Langer, proposes a rate-adaptive optical wireless transmission system based on orthogonal frequency division multiplexing for indoor communications. The Authors show that a dynamically adaptive system can greatly enhance performance when compared to static operation, and they demonstrate how a loading algorithm, which optimally performs in power-limited systems, needs to be adjusted if the specific terms of the optical wireless channel are to be rigorously obeyed. Finally it is demonstrated that the transmission rate can be significantly improved even further by accepting a minor increase in the error rate as a result of controlled clipping, and the results are compared with the upper system capacity limit.The ninth paper entitled Characterisation of the PMD Distribution along Optical Fibres and Improvement of the Backbone Fibre Infrastructure by a POTDR by A. Ehrhardt, D. Fritzsche, M. Paul, L. Schuerer, D. Breuer, W. 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 high-speed 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. |
| Publisher | ACADEMY PUBLISHER |
| Date | 2010-02-03 |
| Source | Journal of Networks Vol 5, No 2 (2010): Special Issue: Transparent Optical Networking |
| Rights | Copyright © ACADEMY PUBLISHER - All Rights Reserved.To request permission, please check out URL: http://www.academypublisher.com/copyrightpermission.html. |