Browsing by Author "Tomkos, Ioannis"
Now showing items 1-20 of 41
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A comparative study of impairments aware optical networks planning tools
Azodolmolky, Siamak; Angelou, Marianna; Tomkos, Ioannis; Morea, Annalisa; Pointurier, Yvan; Solé Pareta, Josep (2010)
Conference report
Open AccessTransparent and translucent optical networks are widely considered as the prime candidates for the core network technology of the future. These networks provide ultra high speed end-to-end connectivity with high quality ... -
A novel impairment aware RWA algorithm with consideration of QoT estimation inaccuracy
Azodolmolky, Siamak; Pointurier, Yvan; Angelou, Marianna; Careglio, Davide; Solé Pareta, Josep; Tomkos, Ioannis (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-04)
Article
Restricted access - publisher's policyIn all-optical networks the physical layer impairments accumulate along a lightpath and also vary dynamically, and a number of impairment aware routing and wavelength assignment (IA-RWA) techniques have been proposed in ... -
A novel monitor placement algorithm for accurate performance monitoring in optical networks
Angelou, Marianna; Pointurier, Yvan; Azodolmolky, Siamak; Careglio, Davide; Spadaro, Salvatore; Tomkos, Ioannis (2011)
Conference report
Open AccessWe propose a novel monitor placement algorithm that reduces significantly the number of monitors required to accurately assess the QoT of all lightpaths established in an optical network, compared to other monitor placement ... -
A novel offline physical layer impairments aware RWA algorithm with dedicated path protection consideration
Azodolmolky, Siamak; Klinkowski, Miroslaw; Pointurier, Yvan; Angelou, Marianna; Careglio, Davide; Solé Pareta, Josep; Tomkos, Ioannis (2010-10-15)
Article
Open AccessPhysical layer impairments accumulate as light propagates through a lightpath in the transparent optical networks. Therefore, it is possible to provision a lightpath, while its quality of transmission (QoT) does not meet ... -
A survey on physical layer impairments aware routing and wavelength assignment algorithms in optical networks
Azodolmolky, S; Klinkowski, Miroslaw; Marín Tordera, Eva; Careglio, Davide; Solé Pareta, Josep; Tomkos, Ioannis (2009-03)
Article
Restricted access - publisher's policyOptical networks are moving from opaque and translucnet architectures towards all-optical (transparent) architecutres. In translucent architectures a small amount of regeneration (e.g. optical-electronic-optical conversion) ... -
An OFDMA-PON with non-preselected independent ONU sources and centralized feedback wavelength control: Dimensioning and experimental results
Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Escayola Elias, Francisco Javier; Polo Querol, Víctor; Giacoumidis, E.; Kachris, C.; Tomkos, Ioannis; Prat Gomà, Josep Joan (IEEE, 2012)
Conference report
Restricted access - publisher's policyA simple and low cost method for wavelength control based on centralized OLT monitoring and feedback of economical random non-preselected independent ONU sources is presented. The technique was dimensioned and experimentally ... -
Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]
Schindler, Philipp C.; Schmogrow, Rene M.; Dreschmann, Michael; Meyer, Joachim; Tomkos, Ioannis; Prat Gomà, Josep Joan; Krimmel, Heinz-Georg; Pfeiffer, Thomas; Kourtessis, Pandelis; Ludwig, A.; Karnick, D.; Hillerkuss, David; Becker, Juergen; Koos, Christian; Freude, Wolfgang; Leuthold, Juerg (Institute of Electrical and Electronics Engineers (IEEE), 2013-10)
Article
Restricted access - publisher's policyWe demonstrate a remotely seeded flexible passive optical network (PON) with multiple low-speed subscribers but only a single optical line terminal transceiver operating at a data rate of 31.25 Gbits/s. The scheme is based ... -
Control and management requirements for a coherent ultra-dense WDM PON for lambda to the user access networks
Ververidis, Christopher; Tomkos, Ioannis; Klonidis, Dimitrios; Rafel, Albert; Parkin, Neil; Urban, Patryk; Prat Gomà, Josep Joan; Segarra Mullerat, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference report
Restricted access - publisher's policyIn this paper we first highlight the arising MAC-layer requirements for a coherent ultra-dense WDM PON for full and shared lambda to the user access networks. We then report on the appropriate modifications of the XGPON ... -
Demonstration and field trial of a resilient hybrid NG-PON test-bed
Prat Gomà, Josep Joan; Polo Querol, Víctor; Schrenk, Bernhard; Lázaro Villa, José Antonio; Bonada Bo, Francesc; López Pastor, Eduardo Tommy; Omella, M.; Saliou, Fabienne; Trung Le, Quang; Chanclou, Philippe; Leino, D.; Soila, Risto; Spirou, S.; Costa, Liliana; Teixeira, A.; Tosi-Beleffi, G.M.; Klonidis, Dimitrios; Tomkos, Ioannis (2014-10-01)
Article
Restricted access - publisher's policyA multi-layer next generation PON prototype has been built and tested, to show the feasibility of extended hybrid DWDM/TDM-XGPON FTTH networks with resilient optically-integrated ring-trees architecture, supporting broadband ... -
Demonstration of a remotely dual-pumped long-reach PON for flexible deployment
Chanclou, Philippe; Schrenk, Bernhard; Lázaro Villa, José Antonio; Klonidis, Dimitrios; Bonada Bo, Francesc; Saliou, Fabienne; Polo Querol, Víctor; López Pastor, Eduardo Tommy; Le, Q.T.; Brenot, Romain; de Valicourt, Guilhem; Spirou, S.; Soila, Risto; Leino, D.; Tosi Beleffi, Giorgio M.; Tomkos, Ioannis; Chatzi, Sotiria; Teixeira, A.; Costa, L.; Kazmierski, Christophe; Prats, Jordi (2012-04-01)
Article
Restricted access - publisher's policyWe propose and experimentally demonstrate a flexible wavelength division multiplexing/time division multiplexing network architecture for converged metro-access environment. Entire passiveness in the fiber plant is ... -
Dynamic impairment-aware optical networking: some experimental results of the EU DICONET project
Spadaro, Salvatore; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Angelou, Marianna; Azodolmolky, Siamak; Qin, Yixuan; Nejabati, Reza; Simeonidou, Dimitra; Tomkos, Ioannis (2011)
Conference report
Restricted access - publisher's policyThe paper presents some results from the experimental validation of the achievements of the EU DICONET project. Specifically, the DICONET test-bed is presented and the experiments conducted for the performance evaluation ... -
Evaluation of the impact of different SDM switching strategies in a network planning scenario
Shariati, Mohammad Behnam; Sayyad Khodashenas, Pouria; Rivas Moscoso, José Manuel; Ben Ezra, Shalva; Klonidis, Dimitrios; Jiménez, Felipe; Velasco Esteban, Luis Domingo; Tomkos, Ioannis (Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Restricted access - publisher's policyWe compare SDM joint and independent switching strategies in a planning scenario involving a European backbone network. Joint switching can achieve cost savings of 40-50% with a performance similar to that of independent ... -
Experimental comparison of impairment-aware RWA algorithms in a GMPLS-controlled dynamic optical network
Angelou, Marianna; Agraz Bujan, Fernando; Kokkinos, Panagiotis; Perelló Muntan, Jordi; Azodolmolky, Siamak; Varvarigos, Emmanouel; Spadaro, Salvatore; Tomkos, Ioannis (2011)
Conference report
Open AccessThe European research project DICONET proposed and implemented a multi-plane impairment-aware solution for flexible, robust and cost-effective core optical networks. The vision of DICONET was realized via a set of cross-layer ... -
Experimental demonstration of a statistical OFDM-PON with multiband ONUs and elastic bandwidth allocation
Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Tomkos, Ioannis; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
Article
Open AccessThe statistical orthogonal frequency division multiplexing passive optical network (OFDM-PON) concept with multiband optical network units (ONUs) is experimentally tested with two users and an optical line terminal at 2.5/5 ... -
Experimental demonstration of centralized and distributed impairment-aware control plane schemes for dynamic transparent optical networks
Tomkos, Ioannis; Gunkel, Mathias; Varvarigos, Manos; Kokkinos, Panagiotis; Pointurier, Yvan; Agraz Bujan, Fernando; Azodolmolky, Siamak; Angelou, Marianna; Perelló Muntan, Jordi; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Francescon, Antonio; Saradhi, Chava (IEEE Computer Society Publications, 2010)
Conference report
Open AccessIn transparent optical networks, the signal experiences the impact of various phenomena that degrade its quality. Considering the impact of physical layer impairments (PLIs) on transparent [1] and highly dynamic optical ... -
Experimental evaluation and improvement methods for low cost transmitters in long reach PONs
Chatzi, Sotiria; Klonidis, Dimitrios; Tsekrekos, Christos P.; Lázaro Villa, José Antonio; Prat Gomà, Josep Joan; Tomkos, Ioannis (2013-12)
Article
Restricted access - publisher's policyIn this paper, we first analyze the degradation stochastic resonance (DSR) effect in the context of adaptive averaging (AD-AVG) architectures. The AD-AVG is the adaptive version of the well-known AVG architecture . It is ... -
Experimental evaluation of path restoration for a centralised impairment-aware GMPLS-controlled all-optical network
Tomkos, Ioannis; Agraz Bujan, Fernando; Perelló Muntan, Jordi; Angelou, Marianna; Azodolmolky, Siamak; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Kokkinos, Panagiotis; Varvarigos, Emmanouel (IEEE Computer Society Publications, 2010)
Conference report
Open AccessThis paper evaluates a centralised impairment-aware path restoration approach for GMPLScontrolled transparent optical networks. Experimental results on a 14-node network test-bed show successful QoT compliant path restoration ... -
Flexible WDM-PON with Nyquist-FDM and 31.25 Gbit/s per wavelength channel using colorless, low-speed ONUs
Schindler, Philipp C.; Schmogrow, Rene M.; Dreschmann, Michael; Meyer, Joachim; Hillerkuss, David; Tomkos, Ioannis; Prat Gomà, Josep Joan; Krimmel, Heinz-Georg; Pfeiffer, Thomas; Kourtessis, Pandelis; Becker, Juergen; Koos, Christian; Freude, Wolfgang; Leuthold, Juerg (Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access - publisher's policyA remotely seeded flexible WDM network solution with 31.25 Gbit/s based on Nyquist sinc-pulses is demonstrated. The low-speed, colorless ONUs use remote heterodyne detection with electrical up- and down-conversion and SOAs ... -
Free space intra-datacenter interconnection utilizing 2D optical beam steering
Shariati, Mohammad Behnam; Bogris, A.; Dijk, P.V.; Roeloffzen, C.; Tomkos, Ioannis; Syvridis, D (Institute of Electrical and Electronics Engineers (IEEE), 2018)
Conference report
Restricted access - publisher's policyWe evaluate the performance and benefits of novel integrated Free-Space-Optics (FSO) transceivers, supporting optical beam steering at low power consumption with ns steering speed. A proper intra-datacenter network ... -
GPON unbundling for multioperator access
Carmona, David; Prat Gomà, Josep Joan; Tomkos, Ioannis; PILAR, SANCHEZ MARCO (Institute of Electrical and Electronics Engineers (IEEE), 2010)
Conference report
Restricted access - publisher's policyThis work aims at considering different unbundling options for the Local Loop Unbundling (LLU) in order to provide multi-operator access and consider the economical impact for the FTTH NGA entrants to deploy such alternatives. ...