Laser phase noise impaired next generation short-reach networks employing MCFs and Kramers Kronig receivers

• Autor(a) principal: Saraiva, Filipe Martins
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10071/27442
• topic: Laser phase noise; Short-reach networks; Multicore fiber; Kramers Kronig receivers; Ruído de fase do laser; Redes de curto alcance; Fibras multi núcleo; Receptores Kramers Kronig

In this work, a short-reach network employing multicore fibers (MCF) and Kramers Kroning (KK) receivers is proposed. The impact of the combined effect of the laser phase noise and the intercore crosstalk (ICXT) on the performance of the proposed system is assessed. It is shown that the impact of the laser phase noise depends on the product between the skew and the laser linewidth (|linewidth×skew|). Thus, the performance of the proposed short-reach MCF-based systems has been assessed considering |linewidth×skew| << 1. Studies for systems with the product between the skew and the symbol rate much higher than one (|skew×Rs| >>1) and much lower than one (|skew×Rs| <<1) are accomplished. It is shown that between the case |skew×Rs| <<1 and |skew×Rs| >>1, there is a reduction in STAXT variances of 10%. When |linewidth×skew| << 1, for different values of laser linewidth, the value of the STAXT variance remains constant, but for |linewidth×skew| >> 1 there is a decrease in STAXT variance of 90% for higher|skew×Rs|. It is suggested that systems with |skew×Rs| <<1 are more dependent on the optical source linewidth of the interfered core. It is also shown that for |skew×Rs| <<1 considering a 10 MHz on both cores, an additional margin of 10 dB of ICXT may be needed relative to an ideal laser to obtain the same outage probability. It is suggested that this degradation is manly caused by the laser phase noise in the interfered core.