Observation of supercontinuum spiral emission in optical fibers F. Mangini, M. Ferraro, M. Zitelli, A. Niang, A. Tonello, V. Couderc and S. Wabnitz EPJ Web Conf., 243 (2020) 17003 Published online: 15 October 2020 DOI: 10.1051/epjconf/202024317003