The low cost and low power advantages of the VCSEL-MMF paradigm will continue through future generations of Datacom networks, at speeds of 200 Gb/s, 400 Gb/s and beyond, meeting the need for higher bandwidth in cloud and large enterprise data centers. Two baseline proposals for 400 Gb/s modules operating over multimode fiber 400GBASE-SR8 and 400GBASE-SR4.2 were adopted by the IEEE P802.3cm task force [1, 2, 3]. In this paper, we will review the literature [4] and provide new experimental evidence that demonstrated the technical feasibility of new 200 Gb/s and 400 Gb/s PHYs over fewer MMF fiber pairs. |The low cost and low power advantages of the VCSEL-MMF paradigm will continue through future generations of Datacom networks, at speeds of 200 Gb/s, 400 Gb/s and beyond, meeting the need for higher bandwidth in cloud and large enterprise data centers. Two baseline proposals for 400 Gb/s modules operating over multimode fiber 400GBASE-SR8 and 400GBASE-SR4.2 were adopted by the IEEE P802.3cm task force [1, 2, 3]. In this paper, we will review the literature [4] and provide new experimental evidence that demonstrated the technical feasibility of new 200 Gb/s and 400 Gb/s PHYs over fewer MMF fiber pairs.

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