This book deals with both, fundamental and advanced concepts in elastic optical networking, and includes practical and theoretical aspects. It focuses on architectures, technologies, control, and management aspects. It also addresses the research challenges and open issues in EONs and provides future directions for future research.

Bijoy Chand Chatterjee is an Assistant Professor and DST Inspire Faculty at South Asian University, New Delhi, India. He is also an Adjunct Professor at Indraprastha Institute of Information Technology Delhi (IIITD), New Delhi. He received the Ph.D. degree from the Department of Computer Science and Engineering, Tezpur University, in 2014. From 2014 to 2017, he was a Post-Doctoral Researcher with the Department of Communication Engineering and Informatics, The University of Electro-Communications, Tokyo, Japan. From 2017 to 2018, he worked as a DST Inspire Faculty at IIITD, India. In 2018, he joined South Asian University, New Delhi, India. Before joining South Asian University, he was an ERCIM Postdoctoral Researcher at the Norwegian University of Science and Technology (NTNU), Norway. His research interests include Optical networks, QoS-aware protocols, Optimization, and Routing. He is a Senior Member of IEEE and a Life Member of IETE.

Eiji Oki is a Professor at Kyoto University, Japan. He received the B.E. and M.E. degrees in instrumentation engineering and a Ph.D. degree in electrical engineering from Keio University, Yokohama, Japan, in 1991, 1993, and 1999, respectively. He was with Nippon Telegraph and Telephone Corporation (NTT) Laboratories, Tokyo, from 1993 to 2008, and The University of Electro-Communications, Tokyo, from 2008 to 2017. From 2000 to 2001, he was a Visiting Scholar at the Polytechnic Institute of New York University, Brooklyn. In 2017, he joined Kyoto University, Japan. He has authored/contributed to twelve IETF RFCs. Prof. Oki was the recipient of the 1999 IEICE Excellent Paper Award, the 2001 IEEE Communications Society Asia-Pacific Outstanding Young Researcher Award, the 2010 Telecom System Technology Prize by the Telecommunications Advanced Foundation, the IEEE HPSR Paper Awards in 2012, 2014, and 2018, the 2015 IEICE Achievement Award, the IEEE Globecom 2015 Best Paper Award, the 2016 Fabio Neri Best Paper Award Runner Up in Optical Switching and Networking, Elsevier, and the Excellent Paper Award of 2019 Information and Communication Technology on Convergence. His research interests include routing, switching, protocols, optimization, and traffic engineering in communication and information networks. He is a Fellow of IEEE and IEICE.

Preface. Introduction to optical networks. Elastic optical networks. Network and node architectures for elastic optical networks. Routing and spectrum allocation for elastic optical networks. Different aspects related to routing and spectrum allocation. Spectrum fragmentation problems in elastic optical networks. Spectrum fragmentation management approaches considering non defragmentation. Spectrum fragmentation management approaches considering defragmentation. Spectrum fragmentation management approaches in 1+1 protected elastic optical networks. Spectrum fragmentation management in software-defined elastic optical networks. Mathematical modeling for problems in elastic optical networks. Computational complexity analysis for problems in elastic optical networks. Research issues and challenges in elastic optical networks. References. Index.