At Journées du GDR ELIOS (https://elios2025.sciencesconf.org/), a workshop on nonlinear effects in optical fibers and integrated waveguides, held in Besançon, France on 14th and 15th of October, 2025, doctoral fellow Ujjal Chettri presented his research on “Optical Bistability in Germanium based Ring Resonators in the Mid-Infrared”. The observation of nonlinearity in such platform is a step forward in achieving microcombs in the mid-infrared.
GDR ELIOS brings together 25 laboratories and 150 researchers specializing in nonlinear effects in optical fibers and integrated optics. Its mission is to foster scientific collaboration, support ANR and European projects, and strengthen industrial partnerships. The research spans a broad range of topics, from specialty optical fibers to photonic chips, for applications such as lasers, sensors, frequency combs, artificial intelligence, supercontinuum and second harmonic generation, from UV to the mid-infrared spectrum.
The thematic focus of these scientific days is to disseminate knowledge and strengthen connections within the research community working on nonlinear optical effects. It offered an opportunity for close interaction with the French nonlinear photonics community in an intimate setting.
