In order to meet the recent vast demands of ICT bandwidth, high speed transmission systems, such as 100G, 200G and 400G, have been developed and installed with extremely high pace. De-fact standardization bodies such as IEEE802.3/OIF have played important roles in the industry for leading the proper concepts/designs of the leading edge high speed transceivers. Reviewing the recent activities of these standardization bodies, the future migration towards 800G and 1.6T with small form factor transceivers are examined. The high bandwidth per channel technology, such as 100GHz and beyond, is a key factor to realize the next generation transceivers such as 800G and 1.6T.
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