Now showing items 1-10 of 10

  • 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 Access
    Transparent 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 policy
    In 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 Access
    We 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 Access
    Physical 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 ...
  • 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 Access
    The 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 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 Access
    In 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 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 Access
    This 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 ...
  • On the offline physical layer impairment aware RWA algorithms in transparent optical networks: state-of-the-art and beyond 

    Azodolmolky, Siamak; Pointurier, Yvan; Klinkowski, Miroslaw; Marín Tordera, Eva; Careglio, Davide; Solé Pareta, Josep; Angelou, Marianna; Tomkos, Ioannis (IEEE Press and Wiley, 2009-02-18)
    Conference report
    Open Access
    In transparent optical networks with no regeneration, the problem of capacity allocation to traffic demands is called "Roting and Wavelength Assignment". Much work on this topic recently has focused on the dynamic case, ...
  • Performance issues in Optical Burst/Packet Switching 

    Klinkowski, Miroslaw; Careglio, Davide; Aracil Rico, Javier; Azodolmolky, Siamak; García Haro, Juan; Gunreben, Sebastian; Hu, Guoqiang; Izal, Mikel; Kimsas, Andreas; Veiga Gontán, Javier; Tzanakaki, Anna; Tomkos, Ioannis; Spadaro, Salvatore; Scharf, Joachim; Perelló Muntan, Jordi; Pavón Mariño, Pablo; Morató, Daniel; Magaña, Eduardo; Köhn, Martin (Springer, 2009-04-01)
    Part of book or chapter of book
    Restricted access - publisher's policy
    This chapter summarises the activities on optical packet switching (OPS) and optical burst switching (OBS) carried out by the COST 291 partners in the last 4 years. It consists of an introduction, five sections with ...
  • Routing and wavelength assignment for transparent optical networks with QoT estimation inaccuracies 

    Azodolmolky, Siamak; Pointurier, Yvan; Angelou, Marianna; Solé Pareta, Josep; Tomkos, Ioannis (2010)
    Conference report
    Restricted access - publisher's policy
    We show how inaccuracies of Quality of Transmission (QoT) estimations, caused by imperfect models and lack of monitors in transparent optical networks, can be mitigated using a novel routing and wavelength assignment algorithm.