Abstract
Bandwidth demands keep increasing, inspiring researchers to continue to find cost-effective ways to increase the line rate in passive optical network (PON) systems. In this paper, we present and discuss proposals to upgrade 10G PONs with a 25-Gbps line rate at low cost and with low power consumption. Our proposals are based on binary nonreturn-to-zero and duobinary-based transmission, which gained a lot of attention as solutions for upgrading PON to a 25 Gbps line rate in recent research papers as well as the standardization body IEEE. The IEEE started standardizing 100G-EPON beginning of 2016. We report the latest results of our study of duobinary detection showing that it is a cost-effective technical feasible solution for 25G PON Also, topics like forward error correction and power consumption are investigated in the context of 25G PON
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