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This article presents OTN evolution from an operator's point of view, including the history of the transport network, the role of the OTN, and the motivations and requirements for OTN evolution. First, a history of transport networks and the role of the OTN in today's networks is reviewed. Next, the motivation for the OTN evolution, operator requirements, and new OTN capabilities are described. Lastly, the future of the OTN is discussed.