RT info:eu-repo/semantics/doctoralThesis
T1 Optimization techniques for planning and operation of the next generation of elastic optical networks
A1 Hosseini, Soheil
A2 Universidad de Valladolid. Escuela de Doctorado
K1 Comunicaciones ópticas
K1 Elastic Optical Networks
K1 Redes Ópticas Elásticas
K1 SDM
K1 Multiband Optical Networks
K1 Redes Ópticas Multibanda
K1 Planning and Operation
K1 Planificación y Operación
K1 33 Ciencias Tecnológicas
AB The attraction of new services and applications over the Internet makes it critical for the network operators to increase the capacity of the current elastic optical networks (EONs). Two promising technologies have been proposed for the next generation of EONs to enhance their bandwidth: Space Division Multiplexing (SDM) and Multiband elastic optical networks (MB-EONs). SDM with multi-core fibers (MCFs) is considered as a promising technology to increase the capacity of optical networks. The realization of SDM networks transforms the traditional routing, modulation level, and spectrum assignment (RMLSA) problem in EONs into a more complex problem involving routing, modulation level, space, and spectrum assignment (RMLSSA) algorithms. To enhance the network performance while employing the SDM technology, in this thesis, we introduce a novel dynamic multipath RMLSSA algorithm for SDM-EON with the aim of minimizing the blocking ratio and the energy consumed by bandwidth variable transponders (BVTs).Despite the potential advantages that SDM technology offers, it also introduces significant challenges, including the progressive shortage of available dark fibers and the immaturity of multicore and multimode fibers for multichannel transmission. Therefore, network operators postpone the process of capacity enhancement through SDM networks. Accordingly, currently, MB-EONs are at the forefront of this capacity improvement in the short and medium term. These networks employ additional spectral bands from the optical fiber other than the C (conventional) band. Due to the current availability of L-band erbium doped fiber amplifiers (EDFAs), lighting up the L-band of already installed fibers is considered as a pragmatic approach. However, network operators envision a soft migration from current C-band to fully upgraded C+L-bands networks to distribute the high cost of equipping all fibers and nodes of a network with multi-band devices over several years. Therefore, it is essential to propose network planning strategies to achieve a partially upgraded EON in which only a subset of links of the network operate over C+L bands. To this end, in this thesis, we propose several planning strategies to determine which links should be migrated from the C to the C+L bands. In the process of migration, the deployment of the appropriate type of transceivers is important for the network operators. Therefore, the thesis also provides insights into the matter of choosing the most efficient transceivers, i.e., single band transceivers or multi-band transceivers.As C+L band systems increase the capacity of optical networks, survivability against network failures must get more emphasis. Therefore, equipping a partially/fully upgraded C+L band network with different protection methods is another focus of the thesis. Despite the importance of designing different survivability methods, it should be taken into account that the level of protection needed against network failures varies across different users/services. To address this issue, this thesis also proposes an SLA-differentiated protection mechanism for C+L multiband networks, ensuring each service receives the appropriate protection level based on its specific requirements.
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/75493
UL https://uvadoc.uva.es/handle/10324/75493
LA eng
NO Escuela de Doctorado
DS UVaDOC
RD 18-abr-2025