**Next-Generation Transport Networks Leveraging Universal Traffic Switching and Flexible Optical Transponders**

Bodhisattwa Gangopadhyay, João Pedro and Stefan Spälter

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.68953

#### **Abstract**

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DOI: 10.1109/50.285338.

210 Optical Fiber and Wireless Communications

DOI: 10.1109/IPCon.2012.6358512.

3, DOI: 10.1109/ECOC.2010.5621291.

pp.1-6, DOI: 10.1109/CSNDSP.2014.6923890.

pp. 1816-1822, 2012, DOI: 10.1109/JPHOT.2012.2215955.

Recent developments in communication technology contributed to the growth of network traffic exponentially. Cost per bit has to necessarily suffer an inverse trend, posing several challenges to network operators. Optical transport networks are no exception to this. On one hand, they have to keep up with the expectations of data speed, volume, and growth at the agreed quality-of-service (QoS), while on the other hand, a steep downward trend of the cost per bit is a matter of concern. Thus, the proper selection of network architecture, technology, resiliency schemes, and traffic handling contributes to the total cost of ownership (TCO). In this context, this chapter looks into the network architectures, including the optical transport network (OTN) switch (both traditional and universal), resiliency schemes (protection and restoration), flexible-rate line interfaces, and an overall strategy of handover in between metro and core networks. A design framework is also described and used to support the case studies reported in this chapter.

**Keywords:** optical transport network, flexible line interfaces, protection and restoration, network planning
