Grzegorz Stępniewski has been working in Glass Department at Institute of Electronic Materials Technology since 2012, where he has been the key person responsible for optical characterization of optical fibers and fiber components. He obtained his PhD in Physics from University of Warsaw in 2018. His thesis was focused on nonlinear effects in soft glass photonic crystal fibers with engineered dispersion profiles. Within his PhD research work he designed, fabricated and fully examined various nonlinear photonic crystal fibers dedicated to supercontinuum generation in the mid-infrared. He also demonstrated supercontinuum generation in the highly birefringent fiber with nanostructured core and he developed the system for dispersion measurement in broad spectral range at higher temperature up to 420 °C. In 2016 he was involved in an international project at Wroclaw University of Science and Technology as a researcher responsible for efficient coupling of quantum dots with optical fiber, after which he returned to ITME to work on erbium and thulium amplifiers seeded by coherent supercontinuum generated in all-normal and polarization maintaining photonic crystal fibers. Grzegorz is also interested in anti-resonant fibers which are very promising in scope of high power ultrafast laser beam delivery as well as gas detection in mid-infrared wavelengths. In February 2020 he joined the team at Faculty of Physics, University of Warsaw for realization the “QUNNA” project within Foundation for Polish Science TEAM-NET program.