White Papers

400G: Are 8 lanes greater than 4?

Dr. Rob Kalman, V.P. of Engineering


4 x 50GBd PAM4 vs. 8 x 25GBd PAM4


Abstract: Hyperscale data centers drive the state of the art in speed, cost, size, and power of optical transceivers. Advances in multi-lane optical packaging, manufacturing automation, and 25GBd components have enabled massive volumes and low costs in 100G transceivers. This suggests 8-lane x 25GBd transceivers rather than 4-lane x 50GBd transceivers may provide a superior near-term 400G intra-data center solution.


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