5th International ICST Workshop on Optical Burst/Packet Switching

Research Article

Dimensioning of Combined OBS/OCS Networks

  • @INPROCEEDINGS{10.1109/BROADNETS.2008.4769055,
        author={Marc De Leenheer and Chris Develder and Jens Buysse and Bart Dhoedt and Piet Demeester},
        title={Dimensioning of  Combined OBS/OCS Networks},
        proceedings={5th International ICST Workshop on Optical Burst/Packet Switching},
        keywords={optical Grid networks dimensioning Integer Linear Programming multi-granular optical switching},
  • Marc De Leenheer
    Chris Develder
    Jens Buysse
    Bart Dhoedt
    Piet Demeester
    Year: 2010
    Dimensioning of Combined OBS/OCS Networks
    DOI: 10.1109/BROADNETS.2008.4769055
Marc De Leenheer1,*, Chris Develder1,*, Jens Buysse1,*, Bart Dhoedt1,*, Piet Demeester1,*
  • 1: Dept. of Information Technology Ghent University - IBBT Gaston Crommenlaan 8 bus 201, 9050 Gent, Belgium
*Contact email: marc.deleenheer@intec.UGent.be, chris.develder@intec.ugent.be, jens.buysse@intec.ugent.be, bart.dhoedt@intec.ugent.be, piet.demeester@intec.ugent.be


To cope with ever-increasing traffic demands in transport networks, all-optical switching is currently perceived as a potential solution to remove bottlenecks caused by opto-electronic conversions. An effective realization of this concept must support a wide range of traffic patterns, while remaining feasible to construct and deploy both in an economical and practical sense. In this paper, we propose the use of multi-granular optical cross-connects (MG-OXC), which support switching on both the wavelength and sub-wavelength level. To this end, the MG-OXCs are equipped with cheap, highly scalable slow switching fabrics, as well as a small number of expensive fast switching ports. The main goal of this work is to motivate the use of multi-granular switching, as this can reduce total network installation costs. To this end, we introduce an Integer Linear Programming model, and our evaluation demonstrates that multi-granular optical switching can be a cost-effective solution on the network level, in comparison to slow only or fast only approaches. Furthermore, we can achieve reduced costs of individual OXC nodes, which allows us to minimize scalability problems corresponding to emerging fast switching fabrics.