1. Fiber Photonics Leibniz Institute of Photonic Technology Albert‐Einstein‐Str. 9 07745 Jena Germany
2. Centre of Energy, Materials and Telecommunications INRS 1650 Boulevard Lionel‐Boulet Varennes Québec J3X 1S2 Canada
3. Otto Schott Institute of Material Research Friedrich Schiller University Jena Fraunhoferstr. 6 07743 Jena Germany