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Optical Transmission Networks(OTN) based on WDM is the next generation transmission network. Signals can be multiplexed, transmitted, amplified, routed and protected in optical domain. OTN is one of the most interesting topic in the field of communications. Based on the basic feature and development of OTN, the main content of this paper is as follows: we introduce the basic concept and features of OTN in Chapter 1.We also presente the development trends and the main challenge of OTN in this Chapter. Transparency and scalability is the basic problem of OTN.