In this paper we propose the use of twin graphs for optical transport network (OTN) physical topology design. Some properties inherent to twin graphs are fault tolerance, performance, cost, scalability, and planarity. Twin graphs can be easily generated by a recursive method. Moreover, the additional capacity required to implement path dedicated protection against single link or node failures is smaller in twin graphs than in existing OTN topologies.
Published August 2013 , 12 pages