Challenges in Realizing the Exabit Optical Communication Infrastructure using 3 “Multi” Technology

 by Masataka Nakazawa
Research Organization of Electrical Communication, Tohoku University
 2-1-1 Katahira, Aoba-ku Sendai-shi, Miyagi 980-8577, Japan


The capacity of the optical communication infrastructure in backbone networks has increased a thousand-fold over the last twenty years. Despite this rapid progress, Internet traffic is continuing to grow at an annual rate of 40%. This means that in twenty years, we will need Petabit/s or even Exabit/s optical communication. In this talk, I present recent challenges and efforts toward achieving a hardware paradigm shift to overcome the capacity limitation imposed by the current optical communication infrastructure. I will overview the latest advances on the three “multi” technologies, i.e. multi-level transmission with ultrahigh spectral efficiency, space division multiplexing in multi-core fibers, and mode division multiplexing with MIMO (multiple-input multiple-output).

Biography (Masataka Nakazawa)

Masataka Nakazawa
Masataka Nakazawa

After receiving his Ph. D. from the Tokyo Institute of Technology, Dr. Nakazawa joined NTT Laboratories in 1980. He was a visiting scientist at MIT in 1984. In 2001, he was appointed professor at Tohoku University, where he became the director of the Research Institute of Electrical Communication. He has been a distinguished professor since 2008. He was the president of the Electronics Society of the IEICE, a director at large of OSA, and a board member of the IEEE Photonics Society. He engaged in research on optical solitons, ultrahigh-speed transmission, and ultrashort pulse lasers that led on from his invention of the compact EDFA. His recent research is focused on digital coherent transmission. He has published 490 papers and presented 360 international conference presentations. He has received many awards including the Purple Ribbon Medal, the Japan Academic Prize, the IEEE Quantum Electronics Award, and the OSA Charles Hard Townes Award. Dr. Nakazawa is a Fellow of the OSA, IEEE, IEICE, and JSAP.


Transitions allow for Adaptivity of Future Communication Systems

 by Ralf Steinmetz

Technical University of Darmstadt, Germany


The existence and the extensive use of suitable transitions will be an innovative prerequisite for future communication systems. In a nutshell, transitions enable adaptivity in communication systems at runtime through exchanging communication mechanisms in a running system to optimize the communication quality. Its aim is to be more adaptive to changes, particularly during ongoing operations.

For instance, this could facilitate the ability to stream a video on a smartphone in high-quality and without interruptions despite busy or overloaded mobile networks. Users could rely on a steady and reliable reception even when attending festivals or crowded sporting events. The formalization of transitions is built upon: 1) capturing the features and relations within a communication system, (2) expressing and optimizing individual and global quality metrics of such a system.

As shown in - for some further readings - we introduce these transitions in the context of media streams. An instantiation of a transition-based 360-degree video streaming system is the challenging example in the networking context. Transitions between sensor- and content-based predictive mechanisms allow to significantly optimize objective Quality-of-Experience (QoE) metrics.

Biography (Ralf Steinmetz)

Prof. Dr.-Ing. Ralf Steinmetz is a full professor at the Department of Electrical Engineering and Information Technology as well as at the Dept. of Computer Science at the Techn. Univ. Darmstadt, Germany, see . Since 1996, there he is managing director of the “Multimedia Communications Lab”; until end of 2001, he directed a Fraunhofer Institute. In 1999, he founded the Hessian Telemedia Technology Competence Center httc; there he holds a chair position. For nearly 10 years he has served as Hessian’s advisor for information and communications technology. He is a member of the Scientific Council and president of the Board of Trustees of the international research institute IMDEA Networks, Madrid, Spain. Currently he has been awarded with a Chair of Excellence at the Univ. Carlos III de Madrid. He is the author and co-author of more than 800 publications. He has edited and co-written a multimedia course which reflects the major issues of the first in-depth technical book on multimedia technology. He is the editor-in-chief of ACM TOMM and has served as editor of various IEEE, ACM and other journals. He was awarded as Fellow of both, the IEEE and the ACM.