Ruben S. Luis is a Senior Researcher at the National Institute of Information and Communication Technology (NICT) in Japan, specializing in cutting-edge optical fiber transmission systems and spatial division multiplexing. Since joining NICT in 2016, he has focused in advancing ultra-high-capacity transmission technologies, particularly in multi-core and multi-mode fiber systems. Dr. Luis earned his doctoral degree in 2007 from the University of Aveiro, Portugal, and his professional journey spans both academia and industry. An active contributor to the scientific community, Dr. Luis is a senior member of IEEE, a member of Optica, and serves as an associate editor for IEEE Photonics Technology Letters and the IEEE/Optica Journal of Lightwave Technology.