University of Cambridge, UK
About: Professor Chu’s research activity has been in the areas of both theoretical and experimental condensed matter physics, semiconductor devices and materials, nanostructures and properties, ferroelectrics non-volatile memory devices, organic electronics and inkjet fabrication process. His current research includes space light modulation using holography for true 3D displays, digital illumination and optical communications. Combining 3D image reconstruction with full parallax and occlusion effects and spatial interactions in spectrum and time domains will provide participants the immersive experience which never exists before. This is now being explored through research work to increase both spatial and temporal bandwidths and development of new approaches to best utilise the existing technology. Energy saving, in particular in the built environment, presents a new challenge to electronic/photonic for innovative new technologies. Professor Chu’s research is focusing on the means for both the active modulation of the spatial profile and impact of lighting and the passive control of solar shading and radiation. Various successful approaches, including laminated electro-active foils (LEAFs) for retro-fitting and development at fundamental level of new devices and materials have been demonstrated.
Title: Wavelength Selective Switchesfor Software Defined Networks and Data Centres
Abstract:The high demand on the data traffic in modern optical communication networks pushes the backbone of the network for long distance data communication to all optical with the information kept in the optical domain in a wavelength division multiplexing (WDM)manner throughout the network until it reaches its final destination. It also requires dynamic routing and flexible definition of the network connectivity. This talk will review the advantages of holographic programmable wavelength selective switch (WSS) based on liquid crystal on silicon (LCOS) light engine as a key enabling technologies for software defined reconfigurable all optical networks, followed by the introduction of a new stacked WSS architecture to allow the WSSs to be reconfigured as ultra-high port count switches or non-blocking wavelength cross-connects (WXCs). Finally, it will address how this stacked WSS architecture can be utilized to meet the optical switching demand in large-scale data centres.
The Hong Kong Polytechnic University
About: Professor Jiannong Cao is a chair professor of the Department of Computing at The Hong Kong Polytechnic University. He is also the director of the Internet and Mobile Computing Lab in the department. Before joined The Hong Kong Polytechnic University in 1997, he has been on faculty of computer science in James Cook University and The University of Adelaide in Australia, and the City University of Hong Kong. Professor Cao is currently an adjunct professor ofSun Yat-Sen University. He also held several adjunct and visiting positions, including an adjunct chair professor of Central South University; an adjunct professor of National University of Defense Technology, Northeastern University, Shanghai Jiao Tong University, Northwest Polytechnic University, and Beijing Jiaotong University; a guest professor of Shenzhen University; a visiting research professor in the National Key Lab for Novel Software Technology, Nanjing University of China; a visiting fellow in the School of Computer Science and Engineering, Nanyang Technological University of Singapore; a visiting scholar of the Institute of Software at Chinese Academy of Science, and Peking University Overseas Scholar Lecture Program.
Professor Cao’s research interests include parallel and distributed computing, wireless networks and mobile computing, big data and cloud computing, pervasive computing, and fault tolerant computing. He has co-authored 5 books in Mobile Computing, co-edited 9 books, and published over 500 papers in major international journals and conference proceedings (including top journals IEEE Network, TC, TMC, TPDS, TWC, TDSC, JSAC, TCOM, TSE; ACM TOSN, TOIT, TAAS; and PMCJ, TON, JPDC, and top conferences INFOCOM, ICNP, PERCOM, WWW, DSN, ICDCS, SRDS).
Professor Cao has directed and participated in over 90 research and development projects and, as a principal investigator, obtained over HK$40 million grants from funding agencies such as National Natural Science Foundation of China (NSFC), Ministry of Science and Technology of P. R. China (MOST), Hong Kong Research Grant Council (RGC), Hong Kong Innovation and Technology Commission (ITC), Hong Kong Construction Industry Council, The Society of Hong Kong Scholars, and industries like Huawei, IBM and Nokia. Professor Cao has also involved in the development of 13 patents.
Haixi Institutes Chinese Academy of Sciences, China
About: Xuan Tang is an academic leader and Professor at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS) since Oct. 2014. She is a team member of Youth Innovation Promotion Association CAS. Her research interests are in the areas of optical wireless communication systems including high speed infrared/ultraviolet laser communications, visible light communications and optical MIMO systems, as well as radio frequency communication technologies. She was awarded BEng in Electronic and Communications Engineering and PhD on Polarisation Shift Keying Modulated Free-Space Optical Communication Systems in 2008 and 2012 from Northumbria University, UK, respectively. From Oct. 2012 to July 2014, she worked as the Postdoctoral Researcher at the Department of Electronic Communications Engineering, Tsinghua University. She is the leader for over 10 projects, including Scientific Research Instrument and Equipment CAS, Bureau of International Cooperation CAS, National Natural Science Foundation of China, Returned Overseas Chinese Scholars of the State Education Ministry, several projects collaborated with industries and so on. She has over 70 publications.
Title: Free-Space Optical Communications: Modeling and Performance Evaluation
Abstract: The data transmission rate, range, and reliability of free-space optical communication (FSO) systems are affected by a number of atmospheric phenomena, such as rain, haze, fog, snow, and scintillation. Thick fog with over 300 dB/km of attenuation limits the link length to around 100 m. Even under clear air conditions with no atmospheric scattering, the FSO communication link still suffers from fading due to scintillation. Scintillation fade margins are 2 to 5 dB for FSO links of 500 metres or less, which is well below margins for the atmospheric attenuation. For the link range beyond 1 km, scintillation may severely impact the performance of FSO links, thus resulting in the link deterioration, i.e., higher outage probability and ultimately complete link failure. In this presentation the performance of terrestrial FSO system under various channel conditions, such as fog, sandstorm, and turbulence, will be investigated and analysed. The results are theoretically and experimentally compared with the existing channel models.
Taiwan Tech (NTUST), Taiwan
About: Jenq-Shiou Leu received his B.S. in mathematics and his M.S. in computer science and information engineering from National Taiwan University, Taipei, Taiwan, in 1991 and 1993, respectively, and his Ph.D. on a part-time basis in computer science from National Tsing Hua University, HsingChu, Taiwan, in 2006. He was with Rising Star Technology, Taiwan, as an R&D Engineer from 1995 to 1997, and worked in the telecommunication industry (Mobital Communications and Taiwan Mobile) from 1997 to 2007 as an Assistant Manager. In February 2007, he joined the Department of Electronic and Computer Engineering at National Taiwan University of Science and Technology as an Assistant Professor. From February 2011 to January 2014, he was an Associate Professor. Since February 2014, he is a Professor and Vice Chairperson. Prof. Leu’s research interests include: Heterogeneous Network Integration, Mobile Service and Platform Design, Distributed Computing (P2P, Cloud Computing), Green and Orange Technology Integration. He has published extensively in these areas, with 55 SCI indexed journal papers and 57 conference papers or book chapters. He is a senior member of IEEE.
Title: Energy Efficient Streaming for Smartphone by Video Adaptation and Backlight Control
Abstract: Smartphone becomes an indispensable gadget in our daily life. Prolonging battery life on smartphone can extend the usability of the phone without being recharged, especially for accessing streaming video, which is a paramount service in the mobile Internet era. Many researchers have proposed energy efficient streaming methods, including bandwidth control and packet scheduling. Such studies have focused on reducing the energy consumption of central processing units (CPUs) and wireless networks; however, screens may drain substantial energy on smartphone. In this study, an energy efficient streaming sys- tem is proposed, combining adaptive coding and a backlight control mechanism. A non-parametric signal prediction is used to predict the network condition and then some adaptive encoding parameters are subsequently adjusted to fit the network capability. A histogram equalization is applied to compensate for the loss of image contrast after reducing the backlight. To validate the proposed concept, some experiments were conducted and the corresponding results show that the proposed streaming system can effectively reduce energy consumption on smartphone, while accessing the video streaming service.