Following the standardization of 400 Gigabit Ethernet for data center networks (DCN), the industry will need 800 Gigabit or 1.6 Terabit pluggable modules soon after 2020. 200G per lambda directly detected links are very promising solutions to achieve the best trade-off between cost, size, and power. This paper investigates the challenges of 200G per lambda in DCN, due to the component bandwidth and noise limitations, and shows the technical feasibility enabled by advanced modulation formats and digital signal processing.
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