>200 Gbit/s multicore fiber-based short-reach networks employing Kramers-Kronig receivers

• Autor(a) principal: André, João Miguel Caetano
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10071/23725
• topic: Multicore fibers; Kramers-Kronig receivers; Short-reach networks; Outage probability; Fibras multi-núcleo; Recetores Kramers-Kronig; Redes de curto alcance; Probabilidade de indisponibilidade

This work proposes a short-reach network with more than 200 Gbit/s bit-rate per user using weakly-coupled multicore fibers (MCF) and Kramers-Kronig (KK) receivers with the goal of providing an alternative solution for high capacity short-reach networks, usually found in data centers (DC). The use of KK receivers combines the high order modulation formats, commonly found in coherent detection receivers, with the cost-effectiveness of direct-detection (DD), two important features in short-reach networks. The use of MCF has been proposed to increase the capacity and density of optical interconnects in DCs. The combined use of these two technologies significantly increases the capacity of shortreach networks while being cost effective and highly performing. A comparison of the performance of three different KK receiver implementations in the presence of inter-core crosstalk (ICXT) is carried out. The different KK receivers are the ideal KK receiver and two variations, one where the photo-current is AC coupled and another where the photo-current is clipped to increase the receiver performance. The outage probability is used as a metric for the performance of the system, it is estimated by Monte Carlo simulation and by the error vector magnitude (EVM). The results show that it is possible to estimate the outage probability of the system using the EVM with an estimation error not exceeding 0.8 dB for an outage probability of 10-3. In addition, the ideal KK receiver has the worst performance since it fails to mitigate the negative excursion of the signal close to zero.