.Research Engineer and Doctoral Student Infinera is looking for an excellent intern professional with a master's degree in electrical engineering, computer science, or physics to join our Optical Architecture Group in Lisbon, Portugal and enrol in a PhD program. The PhD work is part of the Doctoral Network (DN) NESTOR funded by the European Commission and it will be carried out at Infinera premises in Lisbon. As part of the training activities, the candidate will also have an extended secondment at Politecnico di Torino, Turin, Italy. The PhD degree will be awarded by Instituto Universitário de Lisboa (ISCTE). The evolution of optical metro-aggregation networks will be paramount to sustain demanding applications such as 5G/6G, cloud services, and AI/ML. Importantly, not only will the capacity of these networks have to scale significantly, but that will need to be accomplished while key metrics such as cost, power consumption and footprint are kept as low as possible. On the transceiver side, pluggable and flexible coherent interfaces capable of slicing capacity in the optical domain to cope with asymmetric traffic patterns hold the promise of reducing CAPEX and OPEX and allow a native pay-as-you-grow deployment model. On the line system side, lowering CAPEX demands using a selective (i.E., optimized) deployment of pluggable and low-cost filtering/switching and amplification subsystems, that is, adopting a model where filters, switches, amplifiers are used only when needed to satisfy a given set of requirements. However, a customized line system solution may become sub-optimal as traffic increases, more transceivers are deployed, new ones become available or in case the network grows. This results in a multi-objective optimization problem, where (short-term) cost and performance, the latter impacting future cost, must be balanced according to specific priorities set by the network operator. The research and development work will focus on modelling and optimizing next-generation metro-aggregation networks leveraging coherent pluggable transceivers. The main objectives include: Assessment of appropriate line system architectures to cost-effectively support coherent pluggable transceivers capable of operating in point-to-point and point-to-multipoint modes. Implementation of fast and scalable optical performance models for short-/medium-reach transmission. Definition of multi-objective optimization problems targeting scalable and low-cost network deployment solutions and development of scalable optimization frameworks to solve them. Performance evaluation of the design algorithms developed. Assessment of cost, footprint and power-consumption metrics to compare the proposed architectures with state-of-the-art
