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The Role of Higher Baud Rates in Evolving Coherent Transport

Since its emergence in the late 2000s, coherent technology has undergone a number of transitions - first from 40G to 100G, then from hard-decision FEC to soft-decision FEC, and then from single-rate interfaces to flexible-rate interfaces with additional modulation schemes for 150G (8QAM) and 200G (16QAM). With no end in sight to the traffic growth from video, cloud, and DCI, and with the impact of 5G yet to be known, network operators need to scale capacity cost-effectively while minimizing power consumption and footprint. To address this need, network equipment vendors are taking the next steps to evolve coherent optics technology with the option of higher baud rates.

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