Space-division multiplexing (SDM) has recently attracted great attention as a promising technology to further improve the transmission capacity and spectral efficiency. Very recently, SDM employing twisted lights, also known as orbital angular momentum (OAM) carrying lights, provides an alternative approach to increasing the transmission capacity and spectral efficiency of optical communications. …

“Between 2011 and 2018, WHO tracked 1483 epidemic events in 172 countries. Epidemic-prone diseases such as influenza, severe acute respirator syndrome (SARS), Middle East respiratory syndrome (MERS), Ebola, Zika, plague, yellow fever and others are harbingers of a new era of high-impact, potentially fast-spreading outbreaks that are more frequently detected …