Highly efficient side-fused signal pump combiners based on CO2-laser restructured optical fibers E. Brockmüller, L. Kleihaus, F. Wellmann, R. Lachmayer, J. Neumann and Kracht D. EPJ Web Conf., 267 (2022) 02008 Published online: 18 October 2022 DOI: 10.1051/epjconf/202226702008