Now showing items 1-8 of 8

    • Brown-field gradual migration planning toward spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      In this paper, we motivate a brown-field migrationplanning as a cost-efficient procedure to scale the capacity ofshort-term realizable elastic optical networks (EONs), graduallyconverting them into ...
    • Greenfield gradual migration planning toward spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Goscien, Roza; Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (2019-10-01)
      Article
      Open Access
      This article identifies the unavoidably required upgrade of short-term realizable elastic optical networks (EONs) operating over single-mode fibers toward spectrally-spatially flexible optical networks (SS-FONs), exploiting ...
    • ILP modeling of many-to-many replicated multimedia communication 

      Walkowiak, Krzysztof; Bulira, Damian; Careglio, Davide (2013-09-01)
      Article
      Restricted access - publisher's policy
      On-line communication services were evolving from a simple text-based chats towards sophisticated videopresence appliances. The bandwidth consumption of those services is constantly growing due to the technology development ...
    • Inter-core crosstalk impact on migration planning from elastic optical networks to spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (Optical Society of American (OSA), 2019)
      Conference report
      Open Access
      We study inter-core crosstalk (ICXT) impact on migration planning toward spectrally-spatially flexible optical networks considering 22-core multi-core fiber. Results reveal that 55-70% of links need to be upgraded when ...
    • Joint content placement and lightpath routing and spectrum assignment in CDNs over elastic optical network scenarios 

      Perelló Muntan, Jordi; Walkowiak, Krzysztof; Klinkowski, Miroslaw; Spadaro, Salvatore; Careglio, Davide (2016-03-01)
      Article
      Open Access
      In this work, we address the problem of jointly deciding the placement of the contents delivered by a Content Distribution Network (CDN) among the available data centers, together with the allocation of the lightpaths ...
    • Migration planning from elastic optical networks to spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      We focus on a migration planning from elastic to spectrally-spatially flexible optical networks by upgrading regular with SDM-capable ROADMs. Our most promising strategy reveals that by migrating 30% of the regular ROADMs ...
    • Solving large instances of the RSA problem in flexgrid elastic optical networks 

      Walkowiak, Krzysztof; Zotkiewicz, Mateusz; Klinkowski, Miroslaw; Pioro, Michal; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2016-05-01)
      Article
      Open Access
      We present an optimization procedure that mixes advanced large-scale optimization methods and heuristics to solve large instances (with over 1.7 million integer variables) of the routing and spectrum allocation (RSA) ...
    • Spectrum allocation problem in elastic optical networks - a branch-and-price approach 

      Pioro, Michal; Klinkowski, Miroslaw; Zotkiewicz, Mateusz; Walkowiak, Krzysztof; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Restricted access - publisher's policy
      In the paper we present a branch and price approach to routing and spectrum allocation – a basic optimization problem in elastic optical networks. We formulate the problem as a mixed-integer program for which ...