Session Overview |
Optical and Quantum Communications - Bloc 3Room: International 1 |
Date: Tuesday, June 05 |
15:30 |
Quantum multimode resources based on optical frequency combs and implementation of quantum complex networks
Main Author: Syamsundar De Organization: Laboratoire Kastler Brossel, Sorbonne Université, CNRS We present multimode quantum process, based on optical frequency comb and parametric processes in order to generate multimode continuous variables quantum states of light which can be arranged as quantum complex networks |
15:55 |
Mode multiplexed transmissions and optical fiber optimization for low mode crosstalk
Main Author: Sophie LaRochelle Organization: Université Laval, Canada We summarize recent experimental results of space division multiplexing over the vector modes of a few mode polarization maintaining fiber. MIMO-less transmission is achieved over 0.9 km length for six spatial channels with 32 Gbaud QPSK. We also review transmission results of four spatial channels carrying radio-over-fiber signals. |
16:20 |
Coherent Radio Over Fiber for High-Data Rate Wireless Communications
Main Author: Jianping Yao Organization: University of Ottawa, Canada An overview about radio over fiber links for high data rate wireless communications based on coherent detection and digital signal processing with improved sensitivity and spectral efficiency is given. |
16:45 |
Muxer for orbital angular momentum mode division multiplexing
Main Author: Filippo Romanato Organization: University of Padova, Italy We present the design, fabrication and characterization of compact diffractive optical elements for the sorting of beams carrying orbital angular momentum (OAM) of light. The demultiplexer combines a conformal mapping transformation with an optical fan-out, performing demultiplexing with unprecedented levels of miniaturization and OAM resolution. Innovative configurations are proposed which simplify the alignment procedures and further improve the compactness of the optical device. Optical tests with OAM beams confirm the designed performance, showing excellent efficiency and low cross-talk. These results pave the way for practical OAM multiplexing and demultiplexing devices for use both in classical and in quantum communication. |
17:10 |
Urban Free-Space Optical Systems that Employ Space-Division-Multiplexing
Main Author: Mojtaba Mansour Abadi Organization: University of Glasgow, United Kingdom Free-space optical (FSO) communication systems have the potential to revolutionise the way we connect our cities, by providing dynamic untethered connections that can be redistributed as cities needs evolve in time. We will discuss our latest achievements in developing a “plug-and-play” FSO systems suitable for deployment in urban environments. Results will be presented for a link comprising up to 19 spatial channels in various urban use-cases between 15m and 200m. |
17:25 |
Free-space remote sensing of rotation at photon-counting level
Main Author: Wuhong Zhang Organization: Department of Physics, Xiamen University, China The rotational Doppler effect associated with light’s orbital angular momentum (OAM) has been found as a powerful tool to detect rotating bodies. However, this method was only demonstrated experimentally on the laboratory scale under well controlled conditions so far., while its real potential lies at the practical applications in the field of remote sensing. We have established a 120-meter long free-space link between the rooftops of two buildings and show that both the rotation speed and the rotational symmetry of objects can be identified from the detected rotational Doppler frequency shift signal at photon count level. Our work supports the feasibility of a practical sensor to remotely detect both the speed and symmetry of rotating bodies. |
17:40 |
Longitudinal Control of Polarization and Topological Charge of OAM Modes Inside Lossy Media
Main Author: Ahmed Dorrah Organization: University of Toronto, Canada We experimentally demonstrate non-diffracting and attenuation-resistant beams carrying orbital angular momentum (OAM) whose topological charge and polarization can be controlled independently along the beam’s axis. This can address many challenges in optical communications and micromanipulation. |