4D optical fibers thermally drawn from shape-memory polymers Clément Strutynski, Marianne Evrard, Frédéric Désévédavy, Grégory Gadret, Claire-Hélène Brachais, Bertrand Kibler and Frédéric Smektala EPJ Web Conf., 287 (2023) 10005 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328710005