António Eira

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This paper discusses the technical feasibility and network-level potential of defragmentation as a means of extending the capacity of optical transport networks. An experimental setup successfully demonstrates the possibility of rearranging connections spectrally in order to compact spectrum and harvest the benefits from more efficient flexible-grid channel(More)
The large investments required for deploying passive optical networks (PONs) render the disposal of appropriate planning tools for designing such networks in a cost-effective way a necessity. This paper addresses the problem of finding the least costly tree topology time-division multiplexing PON (TDM-PON) deployment configurations considering equipment and(More)
Flex-rate transmission is seen as a core element in the realization of programmable backbone networks. The ability to adjust the channel bit rate in response to traffic changes in the network can potentially bring long-term savings by future-proofing capacity and simplifying network operations. The key issue in this topic is quantifying the degree of(More)
The sliceable bandwidth-variable transponder (SBVT) has been recently proposed as a transmission module able to combine the scalability of superchannel-based transmission with the flexibility required for highly meshed traffic. The modular nature of the SBVT implies that a large array of transmission capacity is predeployed per module, which significantly(More)
Emerging trends in optical transport networks aiming to support increasing data rates are reshaping the possibilities for network planning. The deployment of a flexible grid with multiple available channel bit rates and spectral widths gives way to a more clearly defined trade-off between spectrum and cost in the planning process. Furthermore, providing(More)
We employ a cost-optimization procedure for the static planning of flexible-grid networks with heterogeneous interfaces spanning 40, 100 and 400 Gb/s channels. The optimization results show that the extra capacity enabled by this setup can reach 37% in a long-haul network, and more than double in a metro network. Furthermore, we evaluate different scenarios(More)
Optimization algorithms are a valuable tool for decision makers looking at different technological options and future traffic estimates. In order to quickly and accurately analyse multiple what-if scenarios, these algorithms need to balance solution quality and scalability. In this paper, we look at the specific case of multi-period planning in a transport(More)
Fast developments in the transport network ecosystem are putting into question the foundations on which to base next-generation backbone networks. Flexibility is touted as an essential requirement to cope with traffic increasing in volume and unpredictability. Based on this principle, flexible transmission modules such as the sliceable bandwidth-variable(More)